Patent Application
20100272769
Described herein are layered phyllosilicates capable of interacting with and thereby inactivating significant percentages of bacteria, fungi and a plurality of viruses.
The number of people who were infected with HIV rose to its highest level ever in 2004. The WHO estimated a global total of 39.4 million people living with HIV and that 3.1 million people died of the infection in 2004 (www.unaids.org/wad2004/report.html). Of the world's HIV-infected individuals 50% with teenage girls accounting for 30% of the HIV infected women in some sub-Saharan African countries. Although contraception is available, the HIV epidemic continues to spread highlighting the urgent need for new prevention strategies (Balzarini, J. 2005). Virucides are of interest because they can act quickly and are more direct by binding to the virus coat proteins or viral membranes on contact (Al-Jabri, A. A et al., 2000). A number of HIV virucides are currently under investigation including the physical method of absorbing the virus using mineral clays, a method tried and tested by a number of scientists (Quignon, F. et al. 1997; Clark, K. J., Sarr, A. B., Grant, P.G., Phillips, T. D. & Woode, G. N., 1998; Meschke, J. S. & Sobsey, M. D., 2003). The adsorption effects of bentonite clay in the adsorption of viruses (Sobsey, M. D. and Cromeans, T., 1985; Lipson, S. M. & Stotzky, G., 1985), and bacteria (Stotsky et al., in “Interaction of Soil Minerals with Natural Organics and Microbes,” Huang, P. M., and Schnitzer, M (eds.), Soil Science of America, Inc., Madison, Wis., pp. 305-428, 1986; Filip et al., in “Microbial adhesion and Aggregation,” Marshall, K. C. (eds.), Springer-Verlag, Berlin, pp. 251-282, 1984; Macura et al., Folia Microbiol., 25:90-105, 1980; Lee et al., Biochem. J., 40:815, 1946) for example, have been studied extensively in the last few decades due to its use in microbial filtration in the treatment of water.
Further, in the past century we have witnessed three pandemics of influenza, of which the “Spanish flu” of 1918 was the largest pandemic of any infectious disease known to medical science (Oxford, J.S., 2000). The three strains which caused these pandemics belong to group A of the influenza viruses and, unlike the other two groups (B and C); this group infects a vast variety of animals (poultry, swine, horses, humans and other mammals).
Influenza A viruses continue to cause global problems, both economically and medically (Hayden, F. G. & Palese, P., 2000). The recent South East Asian outbreaks of avian influenza in 2003 and 2004 are ideal examples of this.
Much has been done to control and prevent another pandemic from occurring with many anti-influenza products (vaccines and treatments) currently on the market. The most recognized of these is TAMIFLU® (oseltamivir phosphate), a neuraminidase inhibitor, which functions by preventing spread of the virus within the human body.
Scientists have, in the recent years, been looking to develop new drugs following novel strategies of coping with Influenza. With the numbers of such projects on the rise researchers have been focusing on different Influenza target sites in which to develop new vaccines and treatments. Fiers, W. et al. (2004), for example, have reported the efficacy of an M2e vaccine, which targets the less variable M2 transmembrane protein of the influenza virus. Another example is the “OX40 treatment”, which reduces the excessive immune response that accompanies Influenza infections and which can increase the severity of symptoms (Hussell, T. et al. (2004).
Acute viral gastroenteritis is a very common illness which occurs in both epidemic and endemic forms. It affects all age groups worldwide and also includes some of the commonly encountered traveler's diarrhea. This syndrome is recognized as being second in frequency only to the common cold among illnesses affecting U.S. families under epidemiological surveillance. The clinical presentation of the illness is variable, but in general it is self-limited, has an explosive onset, and is manifested by varying combinations of diarrhea, nausea, vomiting, low-grade fever, abdominal cramps, headache, anorexia, myalgia, and malaise. It is not only responsible for a great deal of misery and time lost from school and work, but can be severe, indeed fatal, in the infant, elderly, or debilitated patient. Due to associated malabsorption, viral gastroenteritis may trigger or enhance the morbidity associated with malnutrition in marginally nourished populations. See Cukor et al., (Microbiol. Rev., 48:157-179, 1984) for further review of viral gastroenteritis.
The recent outbreaks of foot-and-mouth disease (FMD) in a number of FMD-free countries, in particular Taiwan in 1997 and the United Kingdom in 2001, have significantly increased public awareness of this highly infectious disease of cloven-hoofed livestock. Outbreaks have occurred in every livestock-containing region of the world with the exception of New Zealand, and the disease is currently enzootic in all continents except Australia and North America. The disease affects domestic cloven-hoofed animals, including cattle, swine, sheep, and goats, as well as more than seventy species of wild animals, including deer (Fenner et al., Veterinary Virology, p. 403-430, 1993), and is characterized by fever, lameness, and vesicular lesions on the tongue, feet, snout, and teats. Other vesicular diseases, such as swine vesicular disease (SVD), vesicular stomatitis, and vesicular exanthema of swine, cause signs so similar to those of FMD that differential clinical diagnosis alone can be difficult (Bachrach et al., Annu. Rev. Microbiol. 22:201-244, 1968). Although FMD does not result in high mortality in adult animals, the disease has debilitating effects, including weight loss, decrease in milk production, and loss of draught power, resulting in a loss in productivity for a considerable time. Mortality, however, can be high in young animals, where the virus can affect the heart. In addition, cattle, sheep, and goats can become carriers, and cattle can harbor virus for up to 2 to 3 years (Brooksby et al., Intervirology, 18:1-23, 1982). See Grubman et al., (Clin. Microbiol. Rev., 17:465-493) for a further review of foot and mouth disease.
Pathogenic bacteria are a major cause of human death and disease and cause infections such as tetanus, typhoid fever, diphtheria, syphilis, cholera, foodborne illness, leprosy and tuberculosis. A pathogenic cause for a known medical disease may only be discovered many years after, as was the case with Helicobacter pylori and peptic ulcer disease. Bacterial diseases are also important in agriculture, with bacteria causing leaf spot, fire blight and wilts in plants, as well as Johne's disease, mastitis, salmonella and anthrax in farm animals.
Each species of bacteria has a characteristic spectrum of interactions with its mammalian hosts. Some organisms, such as Staphylococcus or Streptococcus, can cause skin infections, pneumonia, meningitis and even overwhelming sepsis, a systemic inflammatory response producing shock, massive vasodilation and death (Fish, Am. J. Health Syst. Pharm., 59:Suppl 1, pp S13-S19, 2002). Yet these organisms are also part of the normal human flora and usually exist on the skin or in the nose without causing any disease at all. Other bacteria invariably cause disease in humans, such as the Rickettsia, which are obligate intracellular parasites able to grow and reproduce only within the cells of other organisms. One species of Rickettsia causes typhus, while another causes Rocky Mountain spotted fever. Chlamydia, another phylum of obligate intracellular bacteria, contains species that can cause pneumonia, or urinary tract infection and may be involved in coronary heart disease (Belland et al., Cell Microbiol., 6:117-127, 2004). Some species such as Pseudomonas aeruginosa, Burkholderia cenocepacia, and Mycobacterium avium are opportunistic pathogens and cause disease mainly in people suffering from immunosuppression or cystic fibrosis (Heise et al., Environ. Health Perspect., 43:9-19, 1982; Saiman, Paediatr Respir Rev., 5:Suppl A: S367-369, 2004).
Bacterial infections may be treated with antibiotics, which are classified as bacteriocidal if they kill bacteria, or bacteriostatic if they just prevent bacterial growth. Antibiotics are used both in treating human disease and in intensive farming to promote animal growth, where the antibiotics may be contributing to the rapid development of antibiotic resistance in bacterial populations (Khachatourians, CMA J, 159:1129-1136, 1998).
Over the past several decades, the frequency of antibacterial resistance and its association with serious infectious diseases have increased at alarming rates. The increasing prevalence of resistance among nosocomial pathogens is particularly disconcerting. Of the over 2 million nosocomial infections occurring each year in the United States, 50 to 60% are caused by antimicrobial-resistant strains of bacteria. This high rate of resistance increases the morbidity, mortality, and costs associated with nosocomial infections. In the United States, nosocomial infections are thought to contribute to or cause more than 77,000 deaths per year and cost approximately $5 to $10 billion annually. Among Gram-positive organisms, the most important resistant pathogens are methicillin- (oxacillin-) resistant Staphylococcus aureus, .beta.-lactam-resistant and multidrug-resistant pneumococci, and vancomycin-resistant enterococci. Important causes of Gram-negative resistance include extended-spectrum β-lactamases (ESBLs) in Klebsiella pneumoniae, Escherichia coli, and Proteus mirabilis, high-level third-generation cephalosporin (Amp C) β-lactamase resistance among Enterobacter species and Citrobacter freundii, and multidrug-resistance genes observed in Pseudomonas aeruginosa, Acinetobacter, and Stenotrophomonas maltophilia. (Jones R N 2001 Chest 119 (supplement), 397S-404S: Resistance patterns among nosocomial pathogens: Trends over the past few years.)
The problem of antibacterial resistance is compounded by the existence of bacterial strains resistant to multiple antibacterials. For example, Pseudomonas aeruginosa isolates resistant to fluoroquinolones are virtually all resistant to additional antibacterials (Sahm D F et al 2001 Antimicrobial Agents and Chemotherapy 45, 267-274).
Layered phyllosilicates, such as bentonite clay, or montmorillonite clay, are the active virus-, bacteria-, fungi-interacting materials described herein for inactivating viruses, bacteria or fungi. Their virus sorption/binding properties, in prior art theory, are due to their negative electrical charge, which attracts positively charged toxins (including bacteria and viruses) and binds them. The layered phyllosilicate materials described herein, however, bind both positively charged and negatively charged virus molecules. It is theorized that sorption and/or binding of the virus to the layered phyllosilicates described herein is achieved by one or more mechanisms selected from the group consisting of adsorption; ionic complexing; electrostatic complexing; chelation; hydrogen bonding; ion-dipole; dipole/dipole; Van Der Waals forces; and any combination thereof. Such ionic bonding, e.g., via one or more cations or negative charge sites of the phyllosilicate sharing electrons with one or two atoms of one or two polar ends of a virus molecule, on a phyllosilicate surface, provides inactivation of a surprisingly high percentage of the virus molecules.
The present invention is directed to the discovery that ion-exchaged layered phyllosilicate materials exhibit anti-microbial properties and therefore can be used as a therapeutic for treatment of disorders caused by pathogenic viruses, bacteria and fungi. In some embodiments, the layered phyllosilicates are useful for adsorbing and/or binding to and, thereby, inactivating viruses, particularly both the human immunodeficiency virus (HIV) and Influenza A virus. The virucidal layered phyllosilicates described herein interact with viruses, adsorb and/or bind them ionically to the virucidal layered phyllosilicates, thereby preventing the viruses from migrating to and penetrating cell membranes, thereby preventing the viruses from reproducing and rupturing the cells and releasing more of the virus attaching to and infecting host cells. The ability of a layered phyllosilicate to interact with and inactivate two very different acting viruses is most unexpected. In some embodiments, the layered phyllosilicates are useful for adsorbing and/or binding to and, thereby inactivating bacteria. In some embodiments, the layered phyllosilicates are useful for adsorbing and/or binding to and, thereby inactivating fungi.
In one aspect, the invention provides a method of inactivating bacteria comprising contacting the bacteria with an ion-exchanged layered phyllosilicate material in an amount effective for bacterial inactivation. In another aspect, the invention provides a method of treating a bacterial infection in a subject, the method comprising administering to said subject an ion-exchanged layered phyllosilicate material in an amount effective to treat said bacterial infection. In yet another aspect, the invention provides a method of treating a bacterial infection in a subject in need of treatment comprising administering to the subject a therapeutically effective amount of a combination therapy comprising (a) an ion-exchanged layered phyllosilicate material and (b) a further anti-bacterial agent. In some embodiments, the subject to be treated is suffering from a disease or condition selected from the group consisting of pneumonia, meningitis, sepsis, bacterial endocarditis, streptococcal exudative pharyngitis, cellulitis, wound infection, visceral abscesses, acute rheumatic fever, poststreptococcal glomerulonephritis, urinary tract infections, septicemia, bacteremia, osteomyelitis, appendicitis, otitis media, colon cancer, strep throat, scarlet fever, impetigo, sinusitis, peritonitis, arthritis, strep pneumonia, pneumococcal pneumonia, pharyngitis, tonsillitis, mastoiditis, joint and bone infections, erysipelas, chorioamnionitis, endometritis, skin and soft tissue infection, conjunctivitis, enterocolitis, toxic shock syndrome, peritonitis, diarrhea, hepatobiliary, peritoneal, cutaneous, and pulmonary infections, ear infections, mastoid sinus infections, headache, constipation, anorexia, abdominal pain and tenderness, dysuria, nonproductive cough, epistaxis, splenomegaly, leucopenia, anemia, liver function abnormalities, proteinuri, acute cholecystitis and hepatitis, pneumonia, osteomyelitis, soft tissue abscesses, glomerulitis, gastroenteritis, epiglottitis, bacteremic Brazilian purpuric fever, chancroid, encephalitis, neuritis, orchitis, cholecystitis, hepatic suppuration, mediastiitis, lung abscess, cholera, hypovolemia, renal tubular necrosis, plague, meliodosis, bronchitis, endocarditis, cellulitis, sexually transmitted diseases, urethritis, cervicitis, proctitis, salpingitis, epididymitis, skin lesions and bone lesions.
In some embodiments, the comprises Gram-positive bacteria selected from the group consisting of Staphylococcus aureus, Staphylococcus epidermidis, S. haemolyticus, S. hominis, S. exotoxin and S. saprophyticus, Streptococcus pyogenes, Streptococcus pneumoniae, Streptococcus agalactia, Streptococcus mutans, E. faecium, E. faecalis, E. avium, E. casseliflavus, E. durans, E. gallinarum, E. dispar, E. hirae, E. flavescens, E. mundtii, E. solitarius, E. raffinosus, Peptostreptococcus magnus, Peptostreptococcus asaccharolyticus, Peptostreptococcus anaerobius, Peptostreptococcus prevotii, Peptostreptococcus micros, Veillonella, S. sobrinus, S. salivarius and S. vestibularis, S. Bovis, S. sanguis, S. gordonii, S. mitis, S. oxalis, S. anginosus, S. constellatus, S. intermedius, S. milleri, S. MG-intermedius, S. anginosus-constellatus; Abiotrophia, Granulicatella, Gemella haemolysans, Gemella morbillorum, Gemella bergeriae, Gemella sanguinis, Rothia mucilaginosa; Aerococcus viridans, A. urine, L. lactis, L. s garviae, Helcococcus kunzii, Globicatella sanguis, Facklamia; Ignavigranum, Dolosicoccus, Dolosigranulum pigrum, A. otitidis, V. fluvialis and V. salmoninarum, L. citreum, L. lactis, L. mesenteroides, L. pseudomesenteroides, L. argentinum, L. paramesenteroides, P. acidilactici, P. pentosaceus, Tetragenococcus halophilus, Lactobacillus sp., L. acidophilus, Clostridium botulinum, Clostridium botulinum, Clostridium perfringens, Clostridium tetani); Actinomyces sp., A. israeli), Bifidobacterium, B. dentium, Nocardia sp., Listeria monocytogenes, Corynebacterium diptheriae, Propionibacterium acnes; Bacillus anthracis, and Erysipelothrix rhusiopathiae.
In some embodiments, the bacteria comprises Gram-negative bacteria selected from the group consisting of K. pneumoniae, Citrobacter, S. marascens, Enterobacter, P. mirabilis, P. vulgaris, P. myxofaciens, M. morganii, P. rettgeri, P. alcalifaciens, P. stuartii, Salmonella sp., S. typhi, S. paratyphi A, B S. schottmuelleri, S. hirschfeldii, S. enteritidis, S. typhimurium, S. heidelberg, S. newport, S. infantis, S. agona, S. montevideo, and S. saint-paul, S. flexneri, S. sonnei, S. boydii, S. dysenteriae, H. influenzae, Brucella abortus, B. melitensis, B. suis, B. canis, Francisella tularensis, V. cholerae, V. parahaemolyticus, V. mimicus, V. alginolyticus, V. hollisae, V. vulnificus, Y. pestis, Y. enterocolitica, B. pseudomallei, B. cepacia, C. fetus, C. jejuni, C. coli, Helicobacter pylori; Acinetobacter baumannii, Actinobacillus actinomycetemcomitans, Bordetella pertussis; Capnocytophaga; Cardiobacterium hominis, Eikenella corrodens, Kingella kingii, Legionella pneumophila, Pasteurella multisided, Acinetobacter sp., Xanthomonas maltophilia; Aeromonas; Plesiomonas shigelloides, N. gonorrhoeae N. meningitides, Moraxella (Branhamella) catarrhalis, and Veillonella parvula.
In some embodiments, bacteria comprises both Gram-positive and Gram-negative bacteria.
The layered phyllosilicate material useful for virus and/or bacteria and/or fungal interaction, as described herein, includes the following clay minerals: montmorillonite, particularly sodium montmorillonite, protonated hydrogen montmorillonite, magnesium montmorillonite and/or calcium montmorillonite; nontronite; beidellite; laponite; yakhontovite; zincsilite; volkonskoite; hectorite; saponite; ferrosaponite; sauconite; swinefordite; pimelite; sobockite; stevensite; svinfordite; vermiculite; synthetic clays; mixed layered illite/smectite minerals, such as rectorite, tarosovite, and ledikite; admixtures of illites with the clay minerals named above, and the magnesium aluminum silicates. Any one or any mixture of two or more of the above clay minerals is capable of adsorbing, and/or ionically bonding with, any virus, bacteria or fungus, or combination of these pathogens, thereby inactivating the virus(es).
In some embodiments, the layered phyllosilicate material comprises a hydrogen ion-exchanged layered phyllosilicate material. In some embodiments, the layered phyllosilicate material contains a silver cation-liberating compound (e.g., silver nitrate). In some embodiments, the layered phyllosilicate material contains a benzalkonium-liberating compound (e.g., benzalkonium chloride).
The layered phyllosilicate material comprises a smectite clay having at least 80%, at least 90%, at least 95% or more interlayer, exchangeable homoionic cations, preferably sodium ions, based on the total of number of interlayer, exchangeable cations. Other particularly effective phyllosilicates that are effective in interacting with and inactivating significant percentages of a host of viruses, particularly HIV and influenza A viruses, include protonated onium ion-exchanged layered phyllosilicates (protonated organoclays); smectite clays having a particle size less than 74 μm and exfoliated smectite clays, including individual clay platelets and tactoids of 5 or less platelet layers. Smectite clays having a particle size less than preferably less than 50 μm or less than 20 μm are also contemplated.
In one embodiment, the layered phyllosilicates described herein are ingested in the form of a powder or liquid solution or suspension which can further be filled into a capsule or compressed into a tablet for internal interaction and inactivation of viruses and/or bacteria and/or fungi within the gastrointestinal tract that have been or are about to be ingested. When wastes are expelled, viruses and/or bacteria and/or fungi are retained inactivated on the clay and are prevented from causing secondary infections. Such viral and/or bacterial and/or fungal inactivation would prevent the transmission of the virus and/or bacteria and/or fungus to an animal that comes in contact with the expelled waste. For example, the layered phyllosilicate material present in the animal waste would prevent the spread of a virus and/or bacteria and/or fungus from one animal to another (e.g., transmission between livestock or transmission between livestock and their caretakers) and/or prevent viral and/or bacterial and/or fungal contamination of surrounding water supply and/or animal feed. The term “animal” includes, without limitation: mammals; avian species, including chickens, turkeys, geese and ducks; fish (including in particular farmed fish); crustacean species (including in particular shrimp, lobsters, crayfish); and reptiles such as crocodiles and alligators. The term “mammal” as used herein refers to any mammal classified as a mammal, including humans and primates, domestic and farm animals including equine species, bovine species, swine species, caprine species, canine species, feline species, ovine species, rabbits, llamas.
In another embodiment, the layered phyllosilicates described herein can be vaginally inserted for interaction and inactivation of HIV or other sexually-transmitted viruses, in the same manner as a spermicidal foam, crème, gel or body heat-dissolving spermicidal cartridge.
In still another embodiment, the layered phyllosilicates described herein can be held in a vessel for filtering contact with blood, e.g., a secondary dialysis filter, or for filtering viruses and/or bacteria and or fungi from water in a virus- and/or bactereia- and/or fungi-removing water purification step or during processing and manufacturing of biopharmaceuticals, such as monoclonal antibodies and vaccines.
In another embodiment, the layered phyllosilicates described herein can be used as, or form a portion of, a HVAC filtration media to prevent virus- and/or bacteria- and/or fungal-contaminated air from passing between rooms, for example, between rooms in a hospital. In this manner, the layered phyllosilicate could be a coating on the surface of the HVAC component.
In another embodiment, the layered phyllosilicates described herein are used as a nasal spray or mucoadhesive gel or paste within the nasal cavity by spraying a suspension of the layered phyllosilicate in a suitable biocompatible carrier (including water and/or organic solvent) into the nasal passages to coat nasal cells. In this manner, viruses and/or bacteria and/or fungi entering the nose will interact with the phyllosilicate and thereby will be inactivated to prevent infection.
In still another embodiment, a condom is coated with a suspension of the layered phyllosilicates described herein, in a cosmetically acceptable carrier, e.g., water and/or solvent. In the event of condom failure, the layered phyllosilicate interacts with and inactivates viruses and/or bacteria and/or fungus before a sexual partner is infected.
In another embodiment, a suspension of the layered phyllosilicate in a cosmetically acceptable carrier is packaged in a portable container, e.g., a tube or bottle, for use on the hands to periodically inactivate viruses held on a person's skin.
In another embodiment, the layered phyllosilicates can be dispensed throughout a virus- and/or bacteria- and.or fungal-contaminated body of water, such as a pond or lake, to inactivate viruses and/or bacteria and/or fungi therein.
In another embodiment, methods of inactivating a virus are provided. In some embodiments, the methods comprise contacting a virus with a composition comprising an ion-exchanged layered phyllosilicate material and a pharmaceutically acceptable carrier, excipient or diluent. In some embodiments, the layered phyllosilicate material is a hydrogen protonated layered phyllosilicate material.. In some variations, the virus is selected from the group consisting of an enterovirus, a human immunodeficiency virus, an influenza virus, a herpes virus, a norovirus, a rotavirus, a hepatitis virus and a rhinovirus. In some variations, the composition further comprises an antiviral agent selected from the group consisting of acyclovir, docosanol, ribarivin, interferons, and the like; cellulose acetate, carbopol and carrageenan (CAS No. 9000-07-1), pleconaril, amantidine, rimantidine, fomivirsen, zidovudine, lamivudine, zanamivir, oseltamivir, brivudine, abacavir, adefovir, amprenavir, arbidol, atazanavir, atripla, cidofovir, combivir, edoxudine, efavirenz, emtricitabine, enfuvirtide, entecavir, famciclovir, fomivirsen, fosamprenavir, foscarnet, fosfonet, ganciclovir, gardasil, ibacitabine, imunovir, idoxuridine, imiquimod, indinavir, inosine, integrase inhibitor, lamivudine, lopinavir, loviride, mk-0518, maraviroc, moroxydine, nelfinavir, nevirapine, nexavir, nucleoside analogues, oseltamivir, penciclovir, peramivir, pleconaril, podophyllotoxin, ribavirin, rimantadine, ritonavir, saquinavir, stavudine, tenofovir, tenofovir disoproxil, tipranavir, trifluridine, trizivir, tromantadine, truvada, valaciclovir, valganciclovir, vicriviroc, vidarabine, viramidine, zalcitabine, zanamivir and zidovudine.
In seom variations, the methods described herein further comprise contacting the bacteria with a further anti-bacterial agent selected from the group consisting of colloidal silver, penicillin, penicillin G, erythromycin, polymyxin B, viomycin, chloromycetin, streptomycins, cefazolin, ampicillin, methicillin, oxacillin, nafcillin, cloxacillin, dicloxacillin azactam, tobramycin, cephalosporins, cephalothin, cefazolin, cephalexin, cephradine, cefamandole, cefoxitin, and 3rd-generation cephalosporins, Carbapenems, imipenem, meropenem, Biapenem, bacitracin, tetracycline, doxycycline, gentamycin, quinolines, neomycin, clindamycin, kanamycin, metronidazole, treptogramins, Quinupristin/dalfopristun (Synercid™), Streptomycin, Ceftriaxone , Cefotaxime, Rifampin, Glycopeptides, vancomycin, dalbavancin, teicoplanin, LY-333328 (Ortivancin), Macrolides, erythromycin, clarithromycin, azithromycin, lincomycin, clindamycun, Ketolides, Telithromycin, ABT-773, Tetracyclines, Glycylcyclines, Terbutyl-minocycline (GAR-936), Aminoglycosides, Chloramphenicol, Imipenem-cilastatin, Fluoroquinolones, ofloxacin, sparfioxacin, gemifloxacin, cinafloxacun (DU-6859a), Trimethoprim-sulfamethoxazole (TMP-SMX), Ciprofloxacin, topical mupirocin, Oxazolidinones, AZD-2563, Linezolid (Zyvox™) Lipopeptides, Daptomycin, Ramoplanin), ARBELIC (TD-6424) (Theravance), TD-6424 (Theravance), isoniazid (INN), rifampin (RIF), pyrazinamide (PZA), Ethambutol (EMB), Capreomycin, cycloserine, ethionamide (ETH), kanamycun, and p-aminosalicylic acid (PAS). Compositions comprising a layered phyllosilicate material described herein and a furth anti-bacterial agent described herein are also contemplated.
In another embodiment, methods of treating a viral infection in a subject in need thereof are provided. In some embodiments, the methods comprise administering to said subject a therapeutically-effective amount of a combination therapy comprising (a) a layered phyllosilicate material and (b) a further therapeutic agent.
The composition and the therapeutic agent can be administered concurrently or separately. In embodiments where the therapeutic agent and layered phyllo silicate material described herein are administered separately, one would generally ensure that a significant period of time did not expire between the times of each delivery, such that the therapeutic agent and the layered phyllosilicate material described herein would still be able to exert an advantageously combined effect. In such instances, it is contemplated that one would administer both modalities within about 12-24 hours of each other and, more preferably, within about 6-12 hours of each other, with a delay time of only about 12 hours being most preferred. In some situations, it may be desirable to extend the time period for treatment significantly, however, where several days (2, 3, 4, 5, 6 or 7) to several weeks (1, 2, 3, 4, 5, 6, 7 or 8) lapse between the respective administrations. Repeated treatments with one or both agents is specifically contemplated. Exemplary routes of administration of the peptides or compositions described herein include, but are not limited to, intradermal, intramuscular, intraperitoneal, intraocular, intravenous, subcutaneous, topical, oral and intranasal administration.
Another aspect of the invention includes a method of inactivating a virus in the gastrointestinal tract of a subject comprising administering to said subject a composition comprising a layered phyllosilicate material in an amount effective for virus inactivation. Yet another aspect of the invention includes a method of treating a viral infection in the gastrointestinal tract of a subject in need thereof comprising administering to said subject a composition comprising a layered phyllosilicate material and a pharmaceutically acceptable carrier.
In one variation, the composition further comprises a pharmaceutically acceptable carrier, diluent or adjuvant. In some aspects, the subject is a human. In other aspects, the subject is an animal selected from the group consisting of a horse, a cow, sheep, a pig, a llama, an alpaca, a goat, a chicken, a turkey, a duck, a dog, a cat, a mouse, a rat, a rabbit, a guinea pig and a hamster.
In some variations, the virus in the gastrointestinal tract of the subject is an enterovirus; selected from the group consisting of polioviruses, coxsackieviruses, and echoviruses or is a virus is from a genus selected from the group consisting of calciviridae, norovirus and reoviridae. In another embodiment, the virus is norovirus, feline calcivirus or rotavirus.
Another aspect of the invention includes a method of delivering a therapeutic agent to a subject in need thereof comprising administering a composition comprising a therapeutic agent and a layered phyllosilicate material. In one variation, the therapeutic agent is selected from the group consisting of a nucleic acid, a protein, and a small molecule drug and is intercalated within the layered phyllosilicate material. In another variation, the therapeutic agent is selected from the group consisting of colloidal silver, an antisense nucleotide, a thrombin inhibitor, an antithrombogenic agent, a tissue plasminogen activator, a thrombolytic agent, a fibrinolytic agent, a vasospasm inhibitor, a calcium channel blocker, a nitrate, a nitric oxide promoter, a vasodilator, an antimicrobial agent, an antibiotic, an antiplatelet agent, an antimitotic, a microtubule inhibitor, an actin inhibitor, a remodeling inhibitor, an agent for molecular genetic intervention, a cell cycle inhibitor, an inhibitor of the surface glycoprotein receptor, an antimetabolite, an antiproliferative agent, an anti-cancer chemotherapeutic agent, an anti-inflammatory steroid, an immunosuppressive agent, an antibiotic, a radiotherapeutic agent, iodine-containing compounds, barium-containing compounds, a heavy metal functioning as a radiopaque agent, a peptide, a protein, an enzyme, an extracellular matrix component, a cellular component, a biologic agent, an angiotensin converting enzyme (ACE) inhibitor, ascorbic acid, a free radical scavenger, an iron chelator, and an antioxidant.
Another aspect of the invention includes a method of promoting wound healing in a subject in need thereof comprising administering to said subject a therapeutically effective amount of a composition comprising a layered phyllosilicate material and a pharmaceutically acceptable carrier, diluent or excipient. In some variations, the method further comprises administering a therapeutic agent selected from the group consisting of an anti-viral agent, an anti-bacterial agent and an anti-fungal agent. In wound healing aspects, the composition may be in a form selected from the group consisting of a solution, lotion, cream, ointment, powder, suspension, stick, gel, aerosol, or nonaerosol pump spray.
Another aspect of the invention includes a patch comprising a pad material having an upper surface and lower surface, an adhesive on the lower surface, and a therapeutic composition, wherein the therapeutic composition comprises a layered phyllosilicate material.
Yet another aspect of the invention includes a surgical suturing thread coated or impregnated with a composition, wherein said composition comprises a layered phyllosilicate material.
Other aspects of the invention include a method of promoting the absorption of a therapeutic agent through the mucosal membranes in a subject, comprising administering to said subject a composition comprising a therapeutic agent, a layered phyllosilicate material and pharmaceutically acceptable carrier, diluent or excipient.
In yet another aspect, the invention provides a method of delivering a diagnostic agent to a biological fluid or a subject comprising administering a composition comprising a diagnostic agent and a layered phyllosilicate material.
In another aspect, the invention provides a method of inactivating a virus in waste expelled from a subject comprising administering to said subject a composition comprising a layered phyllosilicate material and pharmaceutically acceptable carrier, diluent or excipient in an amount effective for virus inactivation. In some variations, the waste is fecal matter. In other variations, the waste is urine.
In some variations, the phyllosilicate material is sprayed onto an absorbent mask as an air purification device, or included in a hand wipe material (hand sanitizers) for cleaning virus-contaminated surfaces, thereby adsorbing and inactivating the viruses, thereby preventing viruses from being breathed into the nose and mouth of a person or for adsorbing and thereby inactivating viruses from the hands, e.g., before handling a baby; or on gloves to inactivate viruses. In other embodiments, the virucidal layered phyllosilicates can be suspended in lotions, shampoos and foams or skin creams, gels and ointments that are applied to skin, particularly hands and face, or internally within the vagina, for interacting with and thereby inactivating the transfer of viruses from one person to another, or to prevent a person from transferring the virus from external skin to internal cells.
Another aspect of the invention includes a method of inhibiting transfer of a virus to a surface, the method comprising contacting the surface with a composition comprising a layered phyllosilicate material in an amount sufficient for inhibiting the transfer of the virus thereto. In some aspects, the composition is in a form selected from the group consisting of a solution, lotion, cream, ointment, powder, suspension, stick, gel, aerosol and nonaerosol pump spray. The surface can be an inanimate surface or an inanimate surface. In one aspect, the animate surface is on a subject selected from the group consisting of a human, a horse, a cow, sheep, a pig, a llama, an alpaca, a chicken, a turkey, a duck, a goat, a dog, a cat; a dromedary, an exotic animal, a zoo animal, a mouse, a rat, a rabbit, a guinea pig, and a hamster.
Other aspects include a method of inactivating a virus on an animate surface comprising contacting said surface with a composition comprising a layered phyllosilicate material in an amount sufficient to inactivate said virus. Methods of inactivating a virus on an inanimate surface are also provided.
Another aspect of the invention includes a use of a layered phyllosilicate material described herein in the manufacture of a medicament for the treatment of a viral infection. Use of a layered phyllosilicate material described herein and a therapeutic agent comprising an anti-viral agent in the manufacture of a medicament for the treatment of a viral infection is also contemplated.
The foregoing summary is not intended to define every aspect of the invention, and additional aspects are described in other sections, such as the Detailed Description. The entire document is intended to be related as a unified disclosure, and it should be understood that all combinations of features described herein are contemplated, even if the combination of features are not found together in the same sentence, or paragraph, or section of this document.
In addition to the foregoing, the invention includes, as an additional aspect, all embodiments of the invention narrower in scope in any way than the variations defined by specific paragraphs above. For example, certain aspects of the invention that are described as a genus, and it should be understood that every member of a genus is, individually, an aspect of the invention. Also, aspects described as a genus or selecting a member of a genus, should be understood to embrace combinations of two or more members of the genus. Although the applicant(s) invented the full scope of the invention described herein, the applicants do not intend to claim subject matter described in the prior art work of others. Therefore, in the event that statutory prior art within the scope of a claim is brought to the attention of the applicant(s) by a Patent Office or other entity or individual, the applicant(s) reserve the right to exercise amendment rights under applicable patent laws to redefine the subject matter of such a claim to specifically exclude such statutory prior art or obvious variations of statutory prior art from the scope of such a claim. Variations of the invention defined by such amended claims also are intended as aspects of the invention.
The present invention is directed to the discovery that ion-exchaged layered phyllosilicate materials exhibit anti-microbial properties and therefore can be used as a therapeutic for treatment of disorders caused by pathogenic viruses, bacteria and fungi. The layered phyllosilicate material may optionally be formulated in a composition comprising a further anti-microbial agent (e.g., anti-viral agent, anti-bacterial agent or anti-fungal agent). The invention therefore describes various therapeutic compositions and methods for using the layered phyllosilicate material.
Whenever used in this specification, the terms set forth shall have the following meanings:
Ranges may be expressed herein as from “about” or “approximately” one particular value and/or to “about” or “approximately” another particular value. When such a range is expressed, another embodiment includes from the one particular value and/or to the other particular value. Similarly, when values are expressed as approximations, by use of the antecedent “about,” it will be understood that the particular value forms another embodiment.
As used herein, the terms “antiviral” or “antiviral activity” refers to the ability of the composition, method, or treatment regimen to reduce the size, extent, severity, and duration of infections, or the communicability of the virus.
As used herein, the terms “antibacterial” or “antibacterial activity” refers to the ability of the a layered phyllosilicate material, a composition comprising a layered phyllosilicate material, method, or treatment regimen utilizing a layered phyllosilicate material to reduce the size, extent, severity, and duration of infections, or the communicability of a bacterium.
As used herein, the term “inhibiting bacterial growth”, refers to blocking or inhibiting replication and/or reducing the rate of replication of bacterial cells in a given environment, for example, in an infective mammalian host.
As used herein, the term “pathogenic bacterium” or “pathogenic bacteria” refers to bacterial cells capable of infecting and causing disease in a mammalian host, as well as producing infection-related symptoms in the infected host, such as fever or other signs of inflammation, intestinal symptoms, respiratory symptoms, dehydration, and the like.
As used herein, the terms “Gram-negative pathogenic bacteria” or “Gram-negative bacteria” refer to the phylum of proteobacteria, which have an outer membrane composed largely of lipopolysaccharides. All proteobacteria are gram negative, and include, but are not limited to Escherichia coli, Salmonella, other Enterobacteriaceae, Pseudomonas, Burkholderi, Moraxella, Helicobacter, Stenotrophomonas, Bdellovibrio, acetic acid bacteria, and Legionella. Other notable groups of gram negative bacteria include Haemophilus influenzae, the cyanobacteria, spirochaetes, green sulfur and green non-sulfur bacteria. The pathogenic capability of gram negative bacteria is usually associated with components of the bacterial cell wall, in particular the lipopolysaccharide (also known as LPS or endotoxin) layer.
As used herein, the terms “Gram-positive pathogenic bacteria” or “Gram-positive bacteria” refer to those bacteria that are stained dark blue or violet by Gram staining, in contrast to Gram-negative bacteria, which cannot retain the stain, instead taking up the counterstain and appearing red or pink. The stain is caused by a high amount of peptidoglycan in the cell wall, which typically, but not always, lacks the secondary membrane and lipopolysaccharide layer found in Gram-negative bacteria. Gram-positive bacteria include many well-known genera such as Bacillus, Listeria, Staphylococcus, Streptococcus, Enterococcus, and Clostridium. It has also been expanded to include the Mollicutes, and bacteria such as Mycoplasma, which lack cell walls and so cannot be stained by Gram, but are derived from such forms.
As used herein, the terms “antifungal” or “antifungal activity” refers to the ability of a layered phyllosilicate material, a composition comprising a layered phyllosilicate material, method, or treatment regimen utilizing a layered phyllosilicate material to reduce the size, extent, severity, and duration of infections, or the communicability of a fungus.
As used herein, the terms “therapeutically effective” or “amount sufficient” refers to when a layered phyllosilicate material, a composition comprising a layered phyllosilicate material, method, or treatment regimen utilizing a layered phyllosilicate material is properly administered in vivo to a vertebrate, such as a bird or mammal, including humans, a measurable beneficial effect occurs. Exemplary beneficial effects include measurable antiviral effects in conditions where viral load can be assayed; a reduction of clinically verifiable and/or patient-reported symptoms or complete resolution or curing of the viral, bacterial or fungal infection or outbreak or other diseases.
As used herein, the terms “hydrogen protonated layered phyllosilicate material” or “hydrogen protonated clay” refers to a layered phyllosilicate material wherein at least 50% of the exchangeable ions of the clay have been exchanged for hydrogen cations. Embodiments where at least 60%, at least 70%, at least 75%, at least 80%, at least 85%, at least 90%, at least 95% or more of the exchangeable ions of the clay have been exchanged for hydrogen cations are also contemplated.
As used herein, the term “virucidal” means capable of inactivating or destroying a virus.
As used herein, the term “bactericidal” means capable of inactivating or destroying the bacteria. The term “anti-bacterial” means capable of inactivating and/or reducing the infectivity of a bacteria.
“Phyllosilicate” or “Virucidal Clay” or “Bactericidal Clay” or “Fungicidal Clay” shall mean clay minerals, e.g., montmorillonite, particularly sodium montmorillonite, magnesium montmorillonite and/or calcium montmorillonite; protonated montmorillonite; nontronite; beidellite; laponite; yakhontovite; zincsilite; volkonskoite; hectorite; saponite; ferrosaponite; sauconite; swinefordite; pimelite; sobockite; stevensite; svinfordite; vermiculite; synthetic clays; mixed layered illite/smectite minerals, such as rectorite, tarosovite, and ledikite; admixtures of illites with the clay minerals named above, and the magnesium aluminum silicates.
“Homoionic Phyllosilicate” shall mean a layered Phyllosilicate material that has been purified by ion-exchange, for example, as described in this assignee's U.S. Pat. No. 6,050,509, to contain at least 90% of a single element, in relation to all interlayer exchangeable cations, from periodic table groups 1a, 2a, 3b, 4b, 5b, 6b, 7b, 8, 1b, 2b, 3a, tin and lead; or a protonated onium ion compound, as the interlayer exchangeable cations.
“Platelets” shall mean individual layers of a Phyllosilicate.
“Intercalate” or “Intercalated” shall mean a phyllosilicate material that includes an onium ion spacing agent, preferably a protonated onium ion spacing agent, disposed between adjacent platelets of the layered Phyllosilicate material to increase the interlayer spacing between the adjacent platelets by at least 3 Å, preferably at least 5 Å, to an interlayer spacing, for example, of at least about 8 Å, preferably at least about 10 Å.
“Intercalation” shall mean a process for forming an Intercalate.
“Onium Ion Intercalant” or “Onium Ion Spacing Agent” or “Onium Ion Compound” shall mean an organic compound, preferably a protonated organic compound, that includes at least one positively charged atom selected from the group consisting of a nitrogen atom, a phosphorous atom, a sulfur atom or an oxygen atom, preferably a quaternary ammonium compound, and when dissolved in water and/or an organic solvent, an anion dissociates from the onium ion spacing agent leaving an onium cation that can ion-exchange with a silicate platelet exchangeable cation of the Phyllosilicate, e.g., Na+, Ca+2, Li+, Mg+2, Al+3, or K+.
“Intercalating Carrier” shall mean a carrier comprising water and/or an organic liquid to form an Intercalating Composition capable of achieving Intercalation of an onium ion spacing agent which ion-exchanges with exchangeable interlayer cations of the layered Phyllosilicate.
“Tactoid” shall mean a stack of individual clay platelet layers having ten or fewer platelets, preferably five or fewer platelets that results from partial exfoliation of a layered phyllosilicate material.
“Intercalating Composition” shall mean a composition comprising one or more onium ion spacing agents, an Intercalating Carrier for the onium ion spacing agent, and a layered Phyllosilicate.
“Exfoliate” or “Exfoliated” shall mean individual platelets of an Intercalated layered Phyllosilicate so that adjacent platelets of the Intercalated layered Phyllosilicate can be dispersed individually throughout a carrier material, such as water, a polymer, an alcohol or glycol, or any other organic liquid, together with tactoids of 2-20 layers of non-exfoliated platelets.
“Exfoliation” shall mean a process for forming an Exfoliate from an Intercalate.
A. Clay Purification and Ion-Exchange
A preferred layered phyllosilicate material useful for interaction with and/or inactivation of a virus, bacteria or fungus is a smectite clay having, as a starting material, sodium or calcium ions as its predominant interlayer exchangeable cation, and that has been purified and ion-exchanged in accordance with this assignee's U.S. Pat. No. 6,050,509, hereby incorporated by reference. The ion-exchange process can be used to provide a homoionic layered phyllosilicate material or can be used to provide the phyllosilicate with mixed cations from the periodic table groups 1a, 1b, 2a, 2b, 3a, 3b, 4b, 5b, 6b, 7b, 8, tin, hydrogen, lead, and/or protonated onium ions, within any percentage of the phyllosilicate exchangeable cations (1-99% of the exchangeable cations). According to U.S. Pat. No. 6,050,509 the smectite clay slurry is pumped to a series of ion exchange columns where any undesirable cation is exchanged with a desirable cation. In this manner, the crude montmorillonite clay can be exchanged to produce a purified montmorillonite with a single (homoionic) desirable cation or with a mixture of cations. In this manner, by using the appropriate ion exchange column, any element can be exchanged for the interlayer cations of a phyllosilicate for interaction with and/or inactivation of a virus, bacteria or fungus, including hydrogen and/or one or more elements from the following groups of the periodic table: group 1a (e.g., lithium, sodium, potassium) group 2a (e.g., magnesium, calcium, barium) group 3b (e.g., lanthanium), group 4b (e.g., titanium) group 5b (e.g., vanadium), group 6b (e.g., chromium), group 7b (e.g., manganese) group 8 (e.g., iron, cobalt, nickel, platinum), group 1b (e.g., copper, gold, silver), group 2b (e.g., zinc, cadmium) group 3a (e.g., boron, aluminum) and selected members of group 4a (e.g., tin and lead). In this manner, one could exchange a metal or metal cation with known, good anti-viral, anti-bacterial or anti-fungal properties on the surface of the montmorillonite clay, or any layered phyllosilicate material, to produce a material with superior anti-microbial (e.g., anti-viral and/or anti-bacterial and/or antifungal) properties. Homoionic hydrogen ion-exchanged layered phyllosilicates are formed as follows: (1) A slurry of 1% by weight of sodium montmorillonite clay in de-ionized water was prepared; (2) The 1% by weight sodium montmorillonite slurry was pumped through an ion-exchange column filled with hydrogen ion-exchange beads. The hydrogen ion-exchange beads were formed by contacting ion-exchange beads with an excess of 2N HCl; and (3) the hydrogen ion-exchanged slurry was diluted to 0.1% by weight for testing.
In accordance with this embodiment of the layered phyllosilicate, the crude layered phyllosilicate deposits initially include one or more of the following non-smectite impurities: (SiO2), feldspar (KAlSi3 O8), opal-CT (SiO2); gypsum (CaSO4.2H2O); albite (NaAlSi3O8); anorthite (CaAl12Si2O8); orthoclase (KAlSi3O8); apatite (Ca5 (PO4)3(F,Cl,OH)); halite (NsCl); calcite (CaCO3); dolomite (CaMg(CO3)2 ; sodium carbonate (Na2CO3); siderite (FeCO3) biotite (K(Mg,Fe)3(AlSi3O10)(OH)2) muscovite (KAl2(AlSi3O10)(OH)2); chlorite ((Mg,Fe)6(Si,Al)4O10(OH)8); stilbite (NaCa2Al5Si13O36.14H2O; pyrite (FeS2); kaolinite (Al2Si2O5.(OH)4); and hematite (Fe2O3).
In order to remove at least 90% by weight of the above impurities, preferably at least 99% of the impurities, preferably, the layered phyllosilicate is dispersed in water, preferably at a concentration of about 10% to about 15% by weight, based on the total weight of phyllosilicate and water. The preferred layered phyllosilicate is a smectite clay, including but not limited to a montmorillonite clay, that is predominantly (greater than about 50% by weight) sodium or calcium (sodium or calcium ions outnumber any other cation in the interlayer spaces between adjacent clay platelets) montmorillonite clay so that the concentration of clay dispersed in water can be as high as about 15% by weight. If, for example, a sodium montmorillonite clay is dispersed in water, the higher swelling capacity of sodium montmorillonite in water will result in a viscosity that is too high for handling at a concentration of about 6-10% by weight. Accordingly, in order to achieve the most efficient purification of the smectite clay, it is preferred that the clay dispersed in water is a montmorillonite clay having predominantly (at least 50% by number) multivalent cations, i.e., Ca+2 in the interlayer space, such as calcium montmorillonite clay. If the clay is not predominantly a multivalent clay, such as calcium montmorillonite, it can be ion-exchanged sufficiently to provide predominantly multivalent ions in the interlayer spaces between montmorillonite clay platelets.
The clay slurry is then directed into a series of cascaded hydrocyclones of decreasing size, each hydrocyclone capable of removing impurities of at least a particular size, particularly the impurities having a size greater than about 74 microns. The resulting clay, separated from the impurities, has a particle size such that at least about 90% by volume of the clay particles have a size below about 74 microns, preferably below about 50 microns, more preferably below about 20 microns. The clay slurry is then directed upwardly through a cation exchange column that removes multivalent interlayer cations from the montmorillonite clay (e.g., divalent and/or trivalent cations) and substitutes monovalent cations such as sodium, lithium and/or hydrogen for the multivalent cations within the interlayer spaces between platelets of the montmorillonite clay.
After essentially complete ion exchange, such that the clay has at least 90%, preferably at least 95%, more preferably at least 99%, by number, monovalent cations in the interlayer spaces, the clay preferably is then directed into a high speed centrifuge where the clay is subjected to centrifugal force equal to, for example, at least about 2,000 G (forces of gravity) up to about 4,000 G, preferably about 2,500 G to about 3,500 G, capable of removing clay particle sizes between about 5 microns and about 74 microns, such that the remaining montmorillonite clay particles, having less than about 50 by weight crystalline and amorphous non-smectite clay impurities, preferably less than about 5% by weight impurities therein, have a particle size of about 10 microns or less, preferably about 8 microns or less, and have an average particle size less than about 3 microns, preferably less than about 2 microns.
In accordance with an important feature of this embodiment, for effective removal of the impurities that have a size less than about 10 microns in diameter, the clay should first be conditioned or treated for removal of all multivalent, e.g., divalent and trivalent, interlayer cations by substitution of the multivalent cations with one or more monovalent cations, such as sodium ions, or protonated onium ions, in order to provide effective removal of the smallest impurities, for example, in a high speed (2,000-4,000 G) centrifuge. In accordance with another important feature of this embodiment, it has been found that conveying the clay slurry through the hydrocyclones prior to monovalent, e.g., sodium ion-exchange provides for a much more efficient process since the material fed to the hydrocyclones can be fed at a higher solids content without an undue increase in the viscosity of the material fed to the hydrocyclones. Accordingly, ion-exchange is accomplished after the clay slurry is passed through the hydrocyclones and before sending the partially purified clay slurry to a centrifuge for removal of the smallest impurities removed from the product.
The product from primary and secondary one inch hydrocyclones are fed by gravity to an ion-exchange feed tank where the clay/water slurry, including impurities, are maintained at a clay concentration of about 1-7% by weight, preferably about 3-7% by weight, based on the total weight of material in the ion-exchange feed tank. The clay slurry from the ion-exchange feed tank is pumped to a series of ion-exchange columns where the interlayer clay cations are exchanged with cations from periodic table groups 1a, 1b, 2a, 2b, 3a, 3b, 4b, 5b, 6b, 7b, 8, tin or lead, preferably sodium. Ion-exchange is achieved, for example, by contact with an ion-exchange resin, preferably PUROLITE C-100, obtained from The PUROLITE Company, a polystyrene cross linked with divinyl benzene, in spherical bead form, in the sodium ionic form, having an 8% by weight divinyl benzene content.
The product from a secondary one inch hydrocyclone includes at least about 90% by number particles having a size less than about 50 microns, preferably less than about 20 microns, more preferably less than about 10 microns, a mean particle size less than about 10 microns, and a median particle size less than about 5 microns.
B. Exfoliated Clay to Form Clay Platelets and/or Tactoids
To form the intercalated and exfoliated layered phyllosilicates described herein, the phyllosilicate material, e.g., sodium and/or calcium bentonite, or any sodium and/or calcium smectite clay, should be swelled or intercalated, in the preferred embodiment, by sorption of an onium ion spacing agent.
While the compositions and methods described herein are described by way of the preferred embodiment via expanding the interlaminar spacing between adjacent platelets of a layered phyllosilicate material by intercalating onium ions between the silicate platelets, the increased interlaminar spacing also can be achieved by intercalating one or more polymers, a silane coupling agent, or by an acidification technique, by substitution with hydrogen (ion-exchanging the interlayer cations with hydrogen by use of an acid or ion-exchange resin) as disclosed in the Deguchi U.S. Pat. No. 5,102,948, and in the Lan, et al. U.S. Pat. No. 5,853,886, both patents hereby incorporated by reference. In this clay exfoliation embodiment, the extremely small size of the individual platelets and clay tactoids should permit interaction with and/or inactivation of a virus.
Sorption of the onium ion spacing agent should be sufficient to achieve expansion of the interlayer spacing of adjacent platelets of the layered phyllosilicate material (when measured dry) by at least about 3 Å, preferably at least about 5 Å.
The onium ion spacing agent is introduced into the layered phyllosilicate galleries in the form of a solid or liquid composition (neat or aqueous, with or without an organic solvent, e.g., an aliphatic hydrocarbon, such as heptane to, if necessary, aid to dissolve the onium ion compound) having an onium ion spacing agent concentration sufficient to provide a concentration of about 5% to about 10% by weight phyllosilicate (90-95% water) and the onium ion compound is dissolved in the phyllosilicate slurry water, preferably at a molar ratio of onium ions to exchangeable interlayer cations of at least about 0.25:1, more preferably at least about 0.5:1, most preferably at least about 1:1. The onium ion-intercalated layered phyllosilicate then is separated from the water easily, since the phyllosilicate is now hydrophobic, and dried in an oven to less than about 15% water, preferably bone dry, before interaction with the virus The onium ion spacing agent compound can be added as a solid with the addition to the layered phyllosilicate material/onium ion compound blend of preferably at least about 20% water, more preferably at least about 30% water or more, based on the dry weight of layered material. Preferably about 30% to about 50% water, more preferably about 30% to about 40% water, based on the dry weight of the layered material, is included in the onium ion intercalating composition, so that less water is sorbed by the intercalate, thereby necessitating less drying energy after onium ion intercalation.
The onium ion spacing agent cations intercalated via ion-exchange into the interlayer spaces between adjacent layered material platelets are primary, secondary, tertiary or quaternary onium ions having the following preferred structure:
The more preferred protonated C6+ onium ions are preferably quaternary ammonium ions having Formula 1, as follows:
wherein R1 is a long chain alkyl moiety ranging from C6 to C24, straight or branched chain, including mixtures of long chain moieties, i.e., C6, C8, C10, C12, C14, C16, C18, C20, C22 and C24, alone or in any combination; and R2, R3 and R4 are moieties, same or different, selected from the group consisting of H, alkyl, benzyl, substituted benzyl, e.g., straight or branched chain alkyl-substituted and halogen-substituted; ethoxylated or propoxylated alkyl; ethoxylated or propoxylated benzyl, e.g., 1-10 moles of ethoxylation or 1-10 moles of propoxylation. Preferred protonated onium ions include protonated octadecylamine, protonated hexyl amine; protonated octyl amine; protonated tallow amine; protonated tallow diamine; protonated tallow triamine; protonated tallow tetraamine; protonated hydrogenated tallow amine; protonated hydrogenated tallow diamine; protonated hydrogenated tallow triamine; protonated hydrogenated tallow tetraamine; protonated octadecyl amine; and mixtures thereof.
R1—X+—R—Y+
where X+ and y+, same or different, are ammonium, sulfonium, phosphonium, or oxonium radicals such as +NH3, +NH2—, +N(CH3)3, +N(CH3)2—, +N(CH3)2(CH2CH3), +N(CH3)(CH2CH3)—, +S(CH3)3, +S(CH3)2—, +P(CH3)3, +P(CH3)2—, +NH4, +NH3—, and the like R is an organic spacing, backbone radical, straight or branched, preferably having from 2 to 24, more preferably 3 to 10 carbon atoms, in a backbone organic spacing molecule covalently bonded at its ends to charged N+, P+, S+ and/or O+ cations and R1 can be hydrogen, or alkyl radical of 1 to 22 carbon atoms, linear or branched, preferably having at least 6 carbon atoms. Examples of R include substituted or unsubstituted alkylene, cycloalkenylene, cycloalkylene, arylene, alkylarylene, either unsubstituted or substituted with amino, alkylamino, dialkylamino, nitro, azido, alkenyl, alkoxy, cycloalkyl, cycloalkenyl, alkanoyl, alkylthio, alkyl, aryloxy, arylalkylamino, alkylamino, arylamino, dialkylamino, diarylamino, aryl, alkylsufinyl, aryloxy, alkylsulfinyl, alkylsulfonyl, arylthio, arylsulfinyl, alkoxycarbonyl, arylsulfonyl, or alkylsilane. Examples of R1 include non-existent; H; alkyl having 1 to 22 carbon atoms, straight chain or branched; cycloalkenyl; cycloalkyl; aryl; alkylaryl, either unsubstituted or substituted or substituted with amino, alkylamino, dialkylamino, nitro, azido, alkenyl, alkoxy, cycloalkyl, cycloalkenyl, alkanoyl, alkylthio, alkyl, aryloxy, arylalkylamino, alkylamino, arylamino, dialkylamino, diarylamino, aryl, alkylsufinyl, aryloxy, alkylsulfinyl, alkylsulfonyl, arylthio, arylsulfinyl, alkoxycarbonyl, arylsulfonyl, or alkylsilane. Illustrative of useful R groups are alkylenes, such as methylene, ethylene, octylene, nonylene, tert-butylene, neopentylene, isopropylene, sec-butylene, dodecylene and the like; alkenylenes such as 1-propenylene, 1-butenylene, 1-pentenylene, 1-hexenylene, 1-heptenylene, 1-octenylene and the like; cycloalkenylenes such as cyclohexenylene, cyclopentenylene and the like; alkanoylalkylenes such as butanoyl octadecylene, pentanoyl nonadecylene, octanoyl pentadecylene, ethanoyl undecylene, propanoyl hexadecylene and the like; alkylaminoalkylenes, such as methylamino octadecylene, ethylamino pentadecylene, butylamino nonadecylene and the like; dialkylaminoalkylene, such as dimethylamino octadecylene, methylethylamino nonadecylene and thelike; arylaminoalkylenes such as phenylamino octadecylene, p-methylphenylamino nonadecylene and the like; diarylaminoalkylenes, such as diphenylamino pentadecylene, p-nitrophenyl-p-α-methylphenylamino octadecylene and the like; alkylarylaminoalkylenes, such as 2-phenyl-4-methylamino pentadecylene and the like; alkylsulfinylenes, alkylsulfonylenes, alkylthio, arylthio, arylsulfinylenes, and arylsulfonylenes such as butylthio octadecylene, neopentylthio pentadecylene, methylsulfinyl nonadecylene, benzylsulfinyl pentadecylene, phenylsulfinyl octadecylene, propylthiooctadecylene, octylthio pentadecylene, nonylsulfonyl nonadecylene, octylsulfonyl hexadecylene, methylthio nonadecylene, isopropylthio octadecylene, phenylsulfonyl pentadecylene, methylsulfonyl nonadecylene, nonylthio pentadecylene, phenylthio octadecylene, ethyltio nonadecylene, benzylthio undecylene, phenethylthio pentadecylene, sec-butylthio octadecylene, naphthylthio undecylene and the like; alkoxycarbonylalkylenes such as methoxycarbonylene, ethoxycarbonylene, butoxycarbonylene and the like; cycloalkylenes such as cyclohexylene, cyclopentylene, cyclo-octylene, cycloheptylene and the like; alkoxyalkylenes such as methoxy-methylene, ethoxymethylene, butoxymethylene, propoxyethylene, pentoxybutylene and the like; aryloxyalkylenes and aryloxyarylenes such as phenoxyphenylene, phenoxymethylene and the like; aryloryalkylenes such as phenoxydecylene, phenoxyoctylene and the like; arylalkylenes such as benzylene, phenthylene, 8-phenyloctylene, 10-phenyldecylene and the like; alkylarylenes such as 3-decylphenylene, 4-octylphenylene, 4-nonylphenylene and the like; and polypropylene glycol and polyethylene glycol substituents such as ethylene, propylene, butylene, phenylene, benzylene, tolylene, p-styrylene, p-phenylmethylene, octylene, dodecylene, octadecylene, methoxy-ethylene, moieties of the formula —C3H6COO—, —C5H10COO—, —C7H10COO—, —C7H14COO—, —C9H18COO—, —C11H22COO—, —C13H26COO—, —C15H30COO—, and —C17H34COO— and —C═C(CH3)COOCH2CH2—, and the like. Such tetra-, tri-, and di-ammonium, -sulfonium, -phosphonium, -oxonium; ammonium/sulfonium; ammonium/phosphonium; ammonium/oxonium; phosphonium/oxonium; sulfonium/oxonium; and sulfonium/phosphonium radicals are well known in the art and can be derived from the corresponding amines, phosphines, alcohols or ethers, and sulfides.
Other useful spacing agent compounds are multi-onium ion compounds that include at least two primary, secondary, tertiary or quaternary ammonium, phosphonium, sulfonium, and/or oxonium ions having Formula 2, as follows:
wherein R is an alkylene, aralkylene or substituted alkylene charged atom spacing moiety, preferably ranging from C3 to C24, more preferably about C3 to C6 for relatively high charge density (150 milliequivalents/100 grams C.E.C. to 70 milliequivalents/100 grams C.E.C.) layered materials; and preferably from C6 to C12 for medium to low charge density (70 milliequivalents/100 grams C.E.C. to 30 milliequivalents/100 grams C.E.C.) layered materials. R can be straight or branched chain, including mixtures of such moieties, i.e., C4, C5, C6, C7, C8, C9, C10, C11, C12, C13, C14, C15, C16, C17, C18, C19, C20, C21, C22, C23 and C24, alone or in any combination; and R1, R2, R3 and R4 are moieties, same or different, selected from the group consisting of hydrogen, alkyl, aralkyl, benzyl, substituted benzyl, e.g., straight or branched chain alkyl-substituted and halogen-substituted; ethoxylated or propoxylated alkyl; ethoxylated or propoxylated benzyl, e.g., 1-10 moles of ethoxylation or 1-10 moles of propoxylation. Z1 and Z2, same or different, may be non-existent, or may be any of the moieties described for R1, R2, R3 or R4. Also, one or both of Z1 and Z2 may include one or more positively charged atoms or onium ion molecules.
Any swellable layered phyllosilicate material that sufficiently sorbs the onium ion spacing agent to increase the interlayer spacing between adjacent phyllosilicate platelets by at least about 3 Å, preferably at least about 5 Å, can be used in the practice of this invention. Useful swellable layered materials include phyllosilicates, such as smectite clay minerals, e.g., montmorillonite, particularly sodium montmorillonite, magnesium montmorillonite and/or calcium montmorillonite; nontronite; beidellite; laponite; yakhontovite; zincsilite; volkonskoite; hectorite; saponite; ferrosaponite; sauconite; swinefordite; pimelite; sobockite; stevensite; svinfordite; vermiculite; synthetic clays; mixed layered illite/smectite minerals, such as rectorite, tarosovite, and ledikite; admixtures of illites with the clay minerals named above, magnesium aluminum silicates; ion-exchanged phyllosilicates, including homoionic and/or protonated phyllosilicates; and mixtures of any two or more of the above-listed phyllosilicates. Exemplary mixtures include any of the above-listed phyllosilicates, wherein one of the above-listed phyllosilicates is present in amount ranging from about 1%-99% wt. and another phyllosilicate is present in an amount ranging from 99%-1% wt.; or wherein one of the above-listed phyllosilicates is present in amount greater than 50% wt and another phyllosilicate is present in an amount less than 50% wt; or wherein one of the above-listed phyllosilicates is present in amount of 50% wt and a second phyllosilicate is present in an amount of 50%; or wherein one of the above-listed phyllosilicates is present in amount of about 10% wt and another phyllosilicate is present in an amount of about 90%; or wherein one of the above-listed phyllosilicates is present in amount of about 20% wt and another phyllosilicate is present in an amount of about 80%; or wherein one of the above-listed phyllosilicates is present in amount of about 30% wt and another phyllosilicate is present in an amount of about 70% wt; or wherein one of the above-listed phyllosilicates is present in amount of about 40% wt and another phyllosilicate is present in an amount of about 60% wt. The weight percent indicated above is based on the weight of the clay mixture.
Preferred swellable layered materials are phyllosilicates of the 2:1 type having a negative charge on the layers ranging from about 0.15 to about 0.9 charges per formula unit and a commensurate number of exchangeable metal cations in the interlayer spaces. Most preferred layered materials are smectite clay minerals such as montmorillonite, nontronite, beidellite, volkonskoite, hectorite, saponite, sauconite, sobockite, stevensite, and svinfordite.
As used herein the “interlayer spacing” refers to the distance between the internal faces of the adjacent phyllosilicate layers as they are assembled in the layered material before any delamination (exfoliation) takes place. The preferred clay materials generally include interlayer cations such as Na+, Ca+2, K+, Mg+2, Al+3+, NH4 and the like, including mixtures thereof, and can be ion-exchanged to include other cations such as the elements from period table group 1a, 1b, 2a, 2b, 3a, 3b, 4b, 5b, 6b, 7b, 8, tin and lead.
The onium ions, may be introduced into (sorbed within) the interlayer spaces of the layered phyllosilicate in a number of ways. In a preferred method of intercalating the onium ions between adjacent platelets of the layered material, the phyllosilicate material is slurried in water, e.g., at 5-20% by weight layered phyllosilicate material and 80-95% by weight water, and the onium ion compound is dissolved in the water in which the phyllosilicate material is slurried. If necessary, the onium ion compound can be dissolved first in an organic solvent, e.g., propanol. The phyllosilicate material then is separated from the slurry water and dried suspending the individual silicate platelets and tactoids in a liquid carrier.
To achieve sufficient intercalation of the onium ions between adjacent platelets of the layered phyllosilicate, the phyllosilicate/onium ion intercalating composition preferably contains a molar ratio of onium ions to layered phyllosilicate of at least 0.25:1, more preferably at least 0.5:1 for the onium ions to exchange interlayer cations with the smectite clay, most preferably 1:1, based on the dry weight of the phyllosilicate, so that the resulting onium ion-intercalated phyllosilicate has interior platelet surfaces that are sufficiently hydrophobic and sufficiently spaced for exfoliation and suspension of the individual platelets and tactoids in a liquid carrier. The onium ion carrier (preferably water, with or without an organic solvent) can be added by first solubilizing or dispersing the onium ion compound in the carrier; or a dry onium ion compound and relatively dry layered phyllosilicate (preferably containing at least about 4% by weight water) can be blended and the intercalating carrier added to the blend, or to the phyllosilicate prior to adding the dry onium ion. When intercalating the phyllosilicate with onium ions in slurry form, the amount of water can vary substantially, e.g., from about 4% by weight, preferably from a minimum of at least about 30% by weight water, with no upper limit to the amount of water in the intercalating composition (the phyllosilicate intercalate is easily separated from the intercalating composition due to its hydrophobicity after onium ion treatment).
Alternatively, the onium ion intercalating carrier, e.g., water, with or without an organic solvent, can be added directly to the phyllosilicate prior to adding the onium ion compound, either dry or in solution. Sorption of the onium ion compound molecules may be performed by exposing the phyllosilicate to a dry or liquid onium ion compound in the onium ion intercalating composition containing at least about 2% by weight, preferably at least about 5% by weight onium ion compound, more preferably at least about 10% onium ion compound, based on the dry weight of the layered phyllosilicate material.
In accordance with an emulsion method of intercalating the onium ions between the platelets of the layered phyllosilicate material, the phyllosilicate, preferably containing at least about 4% by weight water, more preferably about 10% to about 15% by weight water, is blended with water and/or organic solvent solution of an onium ion spacing agent compound in a ratio sufficient to provide at least about 5% by weight, preferably at least about 10% by weight onium ion compound, based on the dry weight of the layered phyllosilicate material.
The onium ion spacing agents have an affinity for the phyllosilicate so that they are sorbed between, and are ion-exchanged with the cations on the inner surfaces of the silicate platelets, in the interlayer spaces.
Viruses constitute a large and heterogeneous group, and they are classified in hierarchical taxonomic categories based on many different characteristics, e.g., morphology, antigenic properties, physiochemical and physical properties, proteins, lipids, carbohydrates, molecular properties, organization and replication, and biological properties. Whether the RNA or DNA is single or double stranded, the organization of the genome and the presence of particular genes comprise important aspects of the current taxonomy of viruses. All of the former are used to place a virus into a particular order or family. The classification is based upon macromolecules produced (structural proteins and enzymes), antigenic properties and biological properties (e.g., accumulation of virions in cells, infectivity, hemagglutination).
Viral classification is dynamic in that new viruses are continuously being discovered and more information is accumulating about viruses already known. The classification and nomenclature of the latest known viruses appear in reports of the International Committee on the Taxonomy of Viruses (ICTV), 7th edition (van Regenmortel et al., editors. Seventh ICTV report. San Diego: Academic Press; 2000.) The basic viral hierarchical classification scheme is: Order, Family, Subfamily, Genus, Species, Strain, and Type as set out below.
Virus orders represent groupings of families of viruses that share common characteristics and are distinct from other orders and families. Virus orders are designated by names with the suffix -virales. Virus families are designated by names with the suffix—viridae. Virus families represent groupings of genera of viruses that share common characteristics and are distinct from the member viruses of other families. Viruses are placed in families on the basis of many features. A basic characteristic is nucleic acid type (DNA or RNA) and morphology, that is, the virion size, shape, and the presence or absence of an envelope. The host range and immunological properties (serotypes) of the virus are also used. Physical and physicochemical properties such as molecular mass, buoyant density, thermal inactivation, pH stability, and sensitivity to various solvents are used in classification. Virus genera represent groupings of species of viruses that share common characteristics and are distinct from the member viruses of other genera. Virus genera are designated by terms with the suffix -virus. A virus species is defined as a polythetic class of viruses that constitutes a replicating lineage and occupies a particular ecological niche.
Some viral families and their respective, sub-families, genera, and species contemplated for inactivation by contact and adsorption by the clays described herein include, but are not limited to, the following viruses set out in Tables 1-3 below.
The use of the layered phyllosilicate material described herein for the inactivation of both enveloped and non-enveloped viruses is contemplated. An enveloped virus comprises a capsid surrounded by a lipid bilayer derived from a membrane of the host cell and membrane proteins involved in adsorption found in the envelope. Non-enveloped viruses lack this lipid bilayer surrounding the capsid and have the proteins associated with adsorption found directly on (or part of) the capsid. Because the layered phyllosilicate material interacts directly with the oppositely charged surface of a virus, the presence of the lipid envelope on an enveloped virus is not expected to affect this interaction. The oppositely charged molecules on the surface of a virus include proteins, glycoproteins, lipids and combinations thereof. Further, because the layered phyllosilicate material interacts with the oppositely charged molecules on the surface of a virus, and not the genetic material in the nucleus of the virus, the inactivation of a virus by the layered phyllosilicate material is not affected by mutation, antigenic drift, or genetic recombination of the virus. Accordingly, a method of preventing a virus from becoming resistant to a particular material, comprising contacting a virus with a material that interacts with the oppositely charged molecules of the virus is specifically contemplated. In one aspect, the interaction between the layered phyllosilicate material and the oppositely charged molecules of the virus is a mechanism selected from the group consisting of adsorption, ionic complexing, electrostatic complexing, chelation, hydrogen bonding, ion-dipole, dipole/dipole, Van Der Waals forces and combinations thereof.
A. Anti-Bacterial Uses
In some embodiments, a layered phyllosilicate material described herein is useful for interacting with and/or inactivating bacteria. The interaction with and/or inactivation of both Gram-positive and Gram-negative bacteria is specifically contemplated. Non-limiting examples of Gram-positive bacteria include, but are not limited to: members of the Staphylococcus genus (e.g., Staphylococcus aureus, Staphylococcus epidermidis, S. haemolyticus, S. hominis, S. exotoxin and S. saprophyticus); the Streptococcus genus (e.g., Streptococcus pyogenes, Streptococcus pneumoniae, Streptococcus agalactia, Streptococcus mutans); the Enterococcus genus (e.g., E. faecium, E. faecalis, E. avium, E. casseliflavus, E. durans, E. gallinarum, E. dispar, E. hirae, E. flavescens, E. mundtii, E. solitarius, E. raffinosus); Peptostreptococcus sp. (e.g. Peptostreptococcus magnus, Peptostreptococcus asaccharolyticus, Peptostreptococcus anaerobius, Peptostreptococcus prevotii, and Peptostreptococcus micros); Veillonella; catalase-negative gram-positive cocci including viridans streptococcal species such as S. mutans and S. sobrinus, S. salivarius and S. vestibularis, S. Bovis, S. pneumoniae, S. sanguis and S. gordonii, S. mitis and S. oxalis, S. anginosus, S. constellatus, and S. intermedius, S. milleri, S. MG-intermedius, S. anginosus-constellatus; Abiotrophia and Granulicatella; the Gemella genus (e.g., Gemella haemolysans, Gemella morbillorum, Gemella bergeriae, Gemella sanguinis); Rothia mucilaginosa; Aerococcus (e.g., Aerococcus viridans, A. urinae); Lactococcus (e.g., L. lactis, L. s garviae); Helcococcus (e.g., Helcococcus kunzii); the genus Globicatella (e.g., Globicatella sanguis); Facklamia; Ignavigranum; Dolosicoccus; Dolosigranulum (e.g., Dolosigranulum pigrum); Alloiococcus (e.g., A. otitidis); Vagococcus (e.g., V. fluvialis and V. salmoninarum); Leuconostoc (e.g., L. citreum, L. lactis, L. mesenteroides, L. pseudomesenteroides, L. argentinum and L. paramesenteroides); Pediococcus (e.g., P. acidilactici and P. pentosaceus), Tetragenococcus (e.g., Tetragenococcus halophilus), Lactobacillus sp., Clostridium sp. (Clostridium botulinum, Clostridium botulinum, Clostridium perfringens, Clostridium tetani); Actinomyces sp.(e.g., A. Israeli), Bifidobacterium (e.g., B. dentium), Nocardia sp, Listeria monocytogenes, Corynebacterium diptheriae, Propionibacterium acnes; Bacillus anthracis, and Erysipelothrix rhusiopathiae, as well as other clinically-relevant gram-positive cocci well known in the art. Non-limiting examples of Gram-Negative bacteria including, but not limited to,: Klebsiella (e.g., K. pneumoniae); Citrobacter; Serratia (e.g., S. marascens); Enterobacter; Proteus (P. mirabilis, P. vulgaris, and P. myxofaciens); Morganella (e.g., M. morganii); Providencia (P. rettgeri, P. alcalifaciens, and P. stuartii); Salmonella sp. (e.g., S. typhi, S. paratyphi A, B S. schottmuelleri, S. hirschfeldii, S. enteritidis); Salmonella sp. (e.g., S. enteritidis S. typhimurium, S. heidelberg, S. newport, S. infantis, S. agona, S. montevideo, and S. saint-paul); the Shigella genus (e.g., S. flexneri, S. sonnei, S. boydii, S. dysenteriae); the Haemophilus genus (e.g., H. influenzae); Brucella sp. (e.g., Brucella abortus, B. melitensis, B. suis, B. canis); Francisella tularensis; Vibrio sp. (e.g., V. cholerae, V. parahaemolyticus, V. mimicus, V. alginolyticus, V. hollisae, V. vulnificus); Yersinia sp. (e.g., Y. pestis, Y. enterocolitica); Burkholderia sp. (e.g., B. pseudomallei, B. cepacia); Campylobacter sp. (e.g., C. fetus, C. jejuni, C. coli); Helicobacter pylori; Acinetobacter baumannii, Actinobacillus actinomycetemcomitans, Bordetella pertussis; Capnocytophaga; Cardiobacterium hominis; Eikenella corrodens; Kingella kingii; Legionella pneumophila; Pasteurella multisided; Acinetobacter sp.; Xanthomonas maltophilia; Aeromonas; Plesiomonas shigelloides, Neisseria sp.(e.g., N. gonorrhoeae and N. meningitides), Moraxella (Branhamella) catarrhalis, and Veillonella sp. (e.g., Veillonella parvula).
In some embodiments, a layered phyllosilicate material described herein is used to treat or prevent infection with Gram-positive cocci (aerobic and anaerobic) including members of the Staphylococcus genus (e.g., Staphylococcus aureus, Staphylococcus epidermidis, S. haemolyticus, S. hominis, S. exotoxin and S. saprophyticus); the Streptococcus genus (e.g., Streptococcus pyogenes, Streptococcus pneumoniae, Streptococcus agalactia, Streptococcus mutans); the Entenococcus genus (e.g., E. faecium, E. faecalis, E. avium, E. casseliflavus, E. durans, E. gallinarum, E. dispar, E. hirae, E. flavescens, E. mundtii, E. solitanius, E. raffinosus); Peptostreptococcus sp. (e.g. Peptostreptococcus magnus, Peptostreptococcus asaccharolyticus, Peptostreptococcus anaerobius, Peptostreptococcus prevotii, and Peptostreptococcus micros.); Veillonella; catalase-negative gram-positive cocci including viridans streptococcal species such as S. mutans and S. sobrinus, S. salivanius and S. vestibularis, S. Bovis, S. pneumoniae, S. sanguis and S. gordonii, S. mitis and S. oxalis, S. anginosus, S. constellatus, and S. intermedius, S. milleni, S. MG-intermedius, S. anginosus-constellatus; Abiotrophia and Granulicatella; the Gemella genus (e.g., Gemella haemolysans, Gemella morbillorum, Gemella bergeniae, Gemella sanguinis); Rothia mucilaginosa; Aerococcus (e.g., Aerococcus viridans, A. uninae); Lactococcus (e.g., L. lactis, L.s garviae); Helcococcus (e.g., Helcococcus kunzii); the genus Globicatella (e.g., Globicatella sanguis); Facklamia; Ignavigranum; Dolosicoccus; Dolosigranulum (e.g., Dolosigranulum pigrum); Alloiococcus (e.g., A. otitidis); Vagococcus (e.g., V. fluvialis and V. salmoninarum); Leuconostoc (e.g., L. citreum, L. lactis, L. mesenteroides, L. pseudomesenteroides, L. argentinum and L. paramesenteroides); Pediococcus (e.g., P. acidilactici and P. pentosaceus), Tetragenococcus (e.g., Tetragenococcus halophilus), as well as other clinically-relevant Gram-positive cocci well known in the art. In some embodiments, a layered phyllosilicate material described herein is used to treat or prevent infections caused by Gram-positive bacilli including, Lactobacillus sp., Clostridium sp. (e.g., Clostridium botulinum, Clostridium botulinum, Clostnidium perfringens, Clostnidium tetani); Actinomyces sp. (e.g., A. Israeli), Bifidobactenium (e.g., B. dentium), Nocardia sp, Listeria monocytogenes, Corynebactenium diptheniae, Propionibactenium acnes; Bacillus anthracis, and Erysipelothnix rhusiopathiae, as well as other clinically-relevant Gram-positive bacilli well known in the art.
In some embodiments, the layered phyllosilicate material disclosed herein are used to treat or prevent infections caused by Gram-negative bacilli including the Klebsiella (e.g., K pneumoniae); Citrobacter; Serratia; Enterobacter; Proteus (P. mirabilis, P. vulganis, and P. myxofaciens); Morganella (e.g., M. morganiz); Providencia (P. rettgeni, P. alcalifaciens, and P. stuartil); Salmonella sp. (e.g., S. typhi, S. paratyphi A, B S. schottmuelleni, S. hirschfeldii, S. enteritidis, S. typhimunium, S. heidelberg, S. newport, S. infantis, S. agona, S. montevideo, and S. saint-paul); the Shigella genus (e.g., S. flexneni, S. sonnei, S. boydii, S. dysenteniae); the Haemophilus genus (e.g., H. influenzae); Brucella sp. (e.g., Brucella abortus, B. melitensis, B. suis, B. canis); Francisella tularensis; Vibrio sp. (e.g., V. cholerae, V. parahaemolyticus, V. mimicus, V. alginolyticus, V. hollisae, V. vulnificus); Yersinia sp. (e.g., Y. pestis, Y. enterocolitica); Bunkholdenia sp. (e.g., B. pseudomallei, B. cepacia); Campylobacter sp. (e.g., C. fetus, C. jejuni, C. coli); Helicobacter pylori; Serratia marcescens; Acinetobacter baumannii, Actinobacillus actinomycetemcomitans, Bordetella pertussis; Capnocytophaga; Cardiobactenium hominis; Eikenella corrodens; Kingella kingii; Legionella pneumophila; Pasteurella multisided; Acinetobacter; Xanthomonas malt ophilia; Aeromonas; Plesiomonas shigelloides, as well as otherclinically-relevant Gram-negative bacilli known in the art. In some embodiments, the layered phyllosilicate material disclosed herein is used to treat or prevent infections caused by Gram-negative cocci including, without limitation, Neissenia sp. (e.g., N. gonorrhoeae and N. meningitides), Moraxella (Branhamella) catarrhalis, Veillonella sp. (e.g., Veillonella parvula) and Acinetobacter sp.
In some embodiments, treatment of bacterial infections caused by the Gram-positive or Gram-negative bacteria described herein by administration of a layered phyllosilicate material described herein is specifically contemplated. Exemplary diseases and conditions caused by such infections include, but are not limited to, pneumonia, meningitis, sepsis, bacterial endocarditis, streptococcal exudative pharyngitis, cellulitis, wound infection, and visceral abscesses, acute rheumatic fever, poststreptococcal glomerulonephritis, urinary tract infections, septicemia, bacteremia, osteomyelitis, appendicitis, otitis media, colon cancer, strep throat, scarlet fever, impetigo, sinusitis, peritonitis, arthritis, strep pneumonia, pneumococcal pneumonia, pharyngitis, tonsillitis, mastoiditis, joint and bone infections, erysipelas, chorioarnnionitis, endometritis, skin and soft tissue infection, conjunctivitis, enterocolitis, toxic shock syndrome, peritonitis, diarrhea, hepatobiliary, peritoneal, cutaneous, and pulmonary infections, ear infections, mastoid sinus infections, headache, constipation, anorexia, abdominal pain and tenderness, dysuria, nonproductive cough, epistaxis, splenomegaly, leucopenia, anemia, liver function abnormalities, proteinuri, acute cholecystitis and hepatitis, pneumonia, osteomyelitis, soft tissue abscesses, glomerulitis, gastroenteritis, epiglottitis, bacteremic Brazilian purpuric fever, chancroid, encephalitis, neuritis, orchitis, cholecystitis, hepatic suppuration, mediastiitis, lung abscess, cholera, hypovolemia, renal tubular necrosis, plague, meliodosis, bronchitis, endocarditis, cellulitis, sexually transmitted diseases, urethritis, cervicitis, proctitis, salpingitis, epididymitis, skin lesions, bone lesions, among others.
In some embodiments, the layered phyllosilicate materials described herein are used to treat bacteria for which Gram stain is not applicable (i.e., that fall outside of the Gram-negative or Gram-positive designation). These include, for example, Borrelia sp. (e.g., B. recurrentis, B. hernsii and B. tunicatae); Bartonella sp., which cause Cat scratch fever, Oroya fever, bacillary angiomatosis, among other diseases; Chlamydiae (e.g., C. trachomatis, C. psittaci, and C. pneumoniae); Calymmatobactenium granulomatis; Leptospira sp. (e.g., Leptospira interrogans); Rickettsia sp. Treponema sp. (e.g., Treponema pallidum), and others known in the art.
In certain embodiments, bacterial infections for treatment with the administration of a layered phyllosilicate material described herein include those associated with staph infections (e.g., Staphylococcus aureus), typhus (e.g., Salmonella typhi), food poisoning (e.g., Escherichia coli, such as 0157:H7), bascillary dysentery (e.g., Shigella dysenteria), pneumonia (e.g., Psuedomonas aerugenosa and/or Pseudomonas cepacia), cholera (e.g., Vibrio cholerae), ulcers (e.g., Helicobacter pylori) and others. E. coli serotype 0157:H7 has been implicated in the pathogenesis of diarrhea, hemorrhagic colitis, hemolytic uremic syndrome (ITUS) and thrombotic thrombocytopenic purpura (TTP). The use of a layered phyllosilicate material described herein against drug-resistant and multiply-drug resistant strains of bacteria, for example, multiply-resistant strains of Staphylococcus aureus and vancomycin-resistant strains of Enterococcus faecium and Enterococcus faecalis is also contemplated.
B. Anti-Viral Uses
In another embodiment, the layered phyllosilicates of the invention are useful for interacting with or inactivating viruses.
In one aspect, inactivation of a virus using the layered phyllosilicate material described herein is by one or more mechanisms selected from the group consisting of adsorption, ionic complexing, electrostatic complexing, chelation, hydrogen bonding, ion-dipole, dipole/dipole, Van Der Waals forces, and any combination thereof. Such ionic bonding provides inactivation of a virus molecule by a phyllosilicate material. Viral inactivation prevents a virus from migrating to and penetrating cell membranes, thereby preventing the virus from reproducing and rupturing the cells and releasing more of the virus to attach to and infect host cells. Accordingly, the layered phyllosilicate material inhibits virus entry and fusion to host cells and provides a physical barrier between a virus and a host cell.
The use of the layered phyllosilicate material described herein for the inactivation of both enveloped and non-enveloped viruses is contemplated. An enveloped virus comprises a capsid surrounded by a lipid bilayer derived from a membrane of the host cell and membrane proteins involved in adsorption found in the envelope. Non-enveloped viruses lack this lipid bilayer surrounding the capsid and have the proteins associated with adsorption found directly on (or part of) the capsid. Because the layered phyllosilicate material interacts directly with the oppositely charged surface of a virus, the presence of the lipid envelope on an enveloped virus is not expected to affect this interaction. The oppositely charged molecules on the surface of a virus include proteins, glycoproteins, lipids and combinations thereof. Further, because the layered phyllosilicate material interacts with the oppositely charged molecules on the surface of a virus, and not the genetic material in the nucleus of the virus, the inactivation of a virus by the layered phyllosilicate material is not affected by mutation, antigenic drift, or genetic recombination of the virus. Accordingly, a method of preventing a virus from becoming resistant to a particular material, comprising contacting a virus with a material that interacts with the oppositely charged molecules of the virus is specifically contemplated.
Thus, in one embodiment, the invention includes a method of inactivating a virus by contacting the virus with a layered phyllosilicate as described herein in an amount effective to inactivate the virus. The method can either be an in vitro method or an in vivo method. In one aspect, a composition comprising a layered phyllosilicate is administered to a subject to inactivate a virus in waste expelled from said subject. In some aspects, the waste is fecal matter. In other aspects, the waste is urine. Because the virus contained in the waste is inactive when expelled from the subject, the virus is unable to infect other subjects that come in contact with the expelled waste.
The invention also provides a method of treating a subject having a viral infection comprising administering an effective amount of a composition comprising a layered phyllosilicate material. In some embodiments, the subject is an animal. Exemplary animals include, but are not limited to, farm animals such as horses, cows, sheep, pigs, alpacas, llamas and goats; companion animals such as dogs and cats; exotic and/or zoo animals; laboratory animals including mice, rats, rabbits, guinea pigs and hamsters; poultry such as chickens, turkey, ducks and geese and other birds. In other embodiments, the subject is a human. Exemplary viral infections include, but are not limited to, those affecting the respiratory system (e.g., pharyngitis, tonsilitis, sinusitis and otitis media, influenza, laryngo-tracheo Bronchitis (croup), acute bronchitis, acute bronchiolitis, pneumonia and bronchopneumonia.), gastrointestinal tract, brain and spinal cord (central nervous system) and the skin.
In one aspect, methods of inhibiting transfer of a virus are provided. For example, provided herein is a method for inhibiting the transfer of a virus to a surface comprising contacting the surface with a composition comprising a layered phyllosilicate material in an amount sufficient for inhibiting the transfer of the virus thereto. In some aspects, the surface is an inanimate surface. Exemplary inanimate surfaces include metal surfaces (including stainless steel), glass surfaces (including pyrex), plastic surfaces (including polystyrene) and stone surfaces. In other aspects, the surface is an animate surface. Exemplary animate surfaces include bone, skin and mucous membranes.
The animate surface can be from an animal subject. Exemplary animals include, but are not limited to, farm animals such as horses, cows, sheep, pigs, llamas, alpacas, poultry and goats; companion animals such as dogs and cats; exotic and/or zoo animals; laboratory animals including mice, rats, rabbits, guinea pigs and hamsters. In other aspects, the subject is a human.
In one aspect, a layered phyllosilicate material is useful for inactivating viruses present on both animate and inanimate surfaces. Thus, in one embodiment, the invention includes methods of inactivating viruses on animate surfaces by contacting the virus with a layered phyllosilicate material. Some of the benefits of the layered phyllosilicate material include it being a natural product and it will leave no harmful residues on biological surfaces and/or will not exhibit any adverse side effects.
The virucidal compositions of this invention may also be used to prevent the spread of infection by viruses that reside in, are transmitted by and/or infect the cells of the dermis or epidermis. That is, in another embodiment, the layered phyllosilicate material may be incorporated into a hand cream, gel or lotion for use by people exposed to viruses. For example, medical personnel could apply the hand cream, gel or lotion (incorporating the layered phyllosilicate material) both before and after the examination of patients with suspected virus infections. In one aspect, the supplemented hand cream, gel or lotion is for human use. In other aspects, it can be applied to animals at risk for contracting a viral infection.
In another aspect, the layered phyllosilicate material is in fluids used to kill viruses on examining tables, instruments, gloves, towels and any other inanimate surfaces which may come in contact with virus particles.
In another embodiment, a layered phyllosilicate material is used prophylactically as a vaccine. Without being bound to any particular mechanism, virus inactivation by layered phyllosilicates occurs upon binding of the layered phyllosilicate to certain glycoprotein receptors on the virus surface, thereby preventing the virus from attaching to receptors on T cells in the body. Accordingly, the layered phyllosilicates, with the inactivated virus adsorbed thereto, is administered to a subject in need of prophylactic treatment. In another embodiment, antigenic epitopes and other immunogenic compounds can be incorporated within the layers of the phyllosilicates and administered to a subject in need of prophylactic treatment. See, for example, U.S. Pat. No. 6,475,595 and U.S. Patent Application Publication No. 2006/0177468.
C. Anti-Fungal Uses
In another embodiment, a layered phyllosilicate material described herein may be used to inactivate a wide variaety of fungi. In another embodiment, a layered phyllosilicate material described herein may treat a variety of fungal infections and diseases associated with such infections, such as Aspergillosis, Candidiasis. In methods described herein for treating fungal infections, a subject in need of such treatment is administered a layered phyllosilicate material described herein in an amount effective to treat the fungal infection. The subject can be a human, non-human primate, or other mammal, such as but not limited to dog, cat, horse, cow, pig, turkey, goat, fish, monkey, chicken, rat, mouse, and sheep.
Fungal infections (mycoses) can cause conditions including the following: tinea capitis, tinea corporis, tinea pedis, tinea barbae, tinea cruris, tinea versicolor, onychomycosis, perionychomycosis, pityriasis versicolor, tinea unguium, oral thrush, vaginal candidosis, respiratory tract candidosis, biliary candidosis, eosophageal candidosis, urinary tract candidosis, systemic candidosis, mucocutaneous candidosis, mycetoma, cryptococcosis, aspergillosis, mucormycosis, chromoblastomycosis, paracoccidioidomycosis, North American blastomycosis, histoplasmosis, coccidioidomycosis, or sporotrichosis. In addition, diseases caused by fungal infection include “systemic mycoses.” These fungal infections are generalized throughout the body. Often, systemic infections are acquired via inhalation of airborne spores and initiated in the lungs. Examples of systemic infections include mucocutaneous candidosis, chromoblastomycosis, mycetoma, cryptococcosis, aspergillosis, mucormycosis, paracoccidioidomycosis, North American blastomycosis, histoplasmosis, coccidioidomycosis (San Joaquin or valley fever), and sporotrichosis.
In some embodiments of the invention, the subject is an immunocompromised host, for example, those infected by HIV, those undergoing chemotherapy, transplant recipients, or cancer patients receiving immunosuppressive medications.
The basis for the definite diagnosis of an invasive fungal infection is the detection of fungal pathogens in sterile body fluids (e.g., blood culture, CNS fluid, bronchoalveolar lavage) and/or tissue samples (e.g., skin, lung, liver, or from other organs) by a mycological culture together with the histological detection of the fungus in tissue. Invasive candidiasis may present only with fever not responding to broad-spectrum antibacterials without any further typical signs. Blood culture remains the most important source for the detection of Candida species as well as other yeasts, e.g., Cryptococcus neoformans, from the blood. In the last 12 years the use of PCR technology was introduced to detect invasive candidiasis or aspergillosis. Various studies suggest good sensitivity and specificity as well as positive correlation with clinical outcome. Common approaches consist either of a nested PCR design or a “Panfungus”-PCR with “unspecific” primers which amplify first a sequence within the small 18S ribosomal unit RNA of most fungal pathogens followed by hybridization with species-specific probes.
In one embodiment, the fungal infection to be treated is aspergillosis. The term “aspergillosis” encompasses a variety of disease processes caused by Aspergillus species. The types of diseases caused by Aspergillus spp. are varied, ranging from an allergy-type illness to life-threatening generalized infections. Diseases caused by Aspergillus are called aspergillosis. Of the more than 300 species of Aspergillus known, only some are ordinarily pathogenic for humans, including: A. fumigatus, A. flavus, A. niger, A. nidulans, A. terreus, A. sydowi, A. flavatus, and A. glaucus.
Opportunistic pulmonary aspergillosis is characterized by widespread bronchial erosion and ulceration, followed by invasion of the pulmonary vessels, with thrombosis, embolization and infarction. Clinically, infection manifests as a necrotizing patchy bronchopneumonia, sometimes with hemorrhagic pulmonary infarction. In about 40% of eases, there is hematogenous spread to other sites. Aspergillosis is also a rare but devastating complication of traumatic wounds, such as, burn wounds, frost bite wounds, or wounds developed by diabetics, where amputation is often required.
Accordingly, in one embodiment of the invention, a method for treating a fungal infection caused by an Aspergillus spp. by administering a layered phyllosilicate material is contemplated.
In some embodiments of the invention, a fungal infection caused by a fungus of the Candida genus is treated. In one embodiment, the yeast is of the Candida albicans species. In other embodiments, the Candida yeast may be of the Candida dubliniensis, Candida parapsilosis, Candida tropicalis, Candida kefrr, Candida guilliermondii, Candida inconspicua, Candida famala, Candida glabrata, Candida krusei, Candida lusitaniae, or other Candida species.
The layered phyllosilicate materials described herein may be used to prevent or treat a fungal infection, such as systemic candidiasis, in a subject in need thereof. In one aspect, the subject is immunocompromised.
The layered phyllosilicate materials described herein may also be used to prevent or treat a fungal infection such as, for example, genital candidiasis. Genital candidiasis, generally known as yeast infection, is the infection of the genital tract caused by Candida albicans.
Diagnosis of a Candida infection can be achieved by microscopic examination, which can reveal Candida fungi with budding forms of pseudohyphae. Candida spp. can be cultured from physiological fluids such as urine with a variety of laboratory media, including cysteine lactose electrolyte deficient, blood agar and Sabouraud's agar with dextrose. Species differentiation is dependent on germ tube growth and carbohydrate fermentation. The utilization of polymerase chain reaction (PCR) amplification has been helpful in the rapid detection of small numbers of C. albicans. Whole cell agglutination, agar cell diffusion, latex agglutination, counter-immune electrophoresis or radio-immunoassays have been utilized to assess patient antibody response to candidal antigen. PCR amplification of Candida gene components has proven efficacious in the detection of occult candidaemia in critically ill patients.
Infections caused by fungal species such as Blastoschizomyces capitatus, Trichosporon, Fusarium spp., Geotrichum, Pseudallescheria boydii. Malassezia furfur and Cunninghamella may be treated using the compositions and methods of the present invention. The pool of patients vulnerable to such infections includes patients with HIV, bone marrow and organ transplants, cancer patients with chemotherapy and premature infants.
D. Wound Healing Aspects
In another aspect, the layered phyllosilicate material is used in wound healing aspects to treat humans or socially or economically important animal species such as dogs, cats, horses, sheep, cows, goats, or pigs. Methods according to the present invention are not limited to use in humans.
A composition comprising the layered phyllosilicate material is suitable for use in situations in which wound healing is desired is specifically contemplated. Exemplary situations include, but are not limited to: (1) diabetic foot and leg ulcerations, including neuropathic ulcerations, decubitus lesions, and necrobiosis lipoidica diabeticorum; (2) vascular ulcerations, including venous stasis ulceration, arterial ulcerations, varicose vein ulcerations, post-thrombotic ulcerations, atrophie blanche ulcerations, congenital absence of veins/ulcerations, congenital or traumatic arteriovenous anastomosis, temporal arteritis, atherosclerosis, hypertension, thrombosis, embolism, platelet agglutination, ankle blow-out syndrome, or hemangiomas; (3) decubitus ulcers or pressure source; (4) traumatic ulcerations, such as those caused by external injuries, burns, scalds, chemical injuries, post-surgical injuries, self-inflicted injuries, lesions at an injection site, neonatal or perinatal trauma, or sucking blisters; (5) infestations and bites, such as those caused by spiders, scorpions, snakes, or fly larvae; (6) cold injury, such as perniosis (erythrocyanosis frigida), or cryoglobulinemic ulcerations; (7) neoplastic ulceration, such as those caused by basal cell carcinomas, squamous cell carcinomas, malignant melanomas, lymphoma, leukemia, Kaposi's sarcoma, tumor erosion, midline lethal granuloma, or Wegener's granulomatosis; (8) blood diseases with ulcerations, such as polycythemia, spherocytosis, or sickle cell anemia; (9) skin diseases with ulcerations, such as tinea, psoriasis, pemphigoid, pemphigus, neurotic excoriations, trichotillomania, erosive lichen planus, or chronic bullous dermatosis of childhood; (10) metabolic disease ulcerations, such as those associated with diabetes mellitus or gout (hyperuricemia); (11) neuropathic ulcerations, such as those associated with diabetes mellitus, tabes dorsalis, or syringomyelia; (12) ischemic ulcerations, such as those associated with scars, fibrosis, or radiation dermatitis; (13) vasculitis ulcerations, such as those associated with lupus erythematosus, rheumatoid arthritis, scleroderma, immune complex disease, pyoderma gangrenosum, or ulceration associated with lipodermatosclerosis; (14) infectious ulcerations, such as: (a) viral ulcerations, e.g. those associated with Herpes simplex or Herpes zoster in an immunocompromised or normal individual; (b) bacterial infections with ulcerations, such as those associated with tuberculosis, leprosy, swimming pool granuloma, ulceration over osteomyelitis, Buruli ulcer, gas gangrene, Meleny's ulcer, bacterial gangrene associated with other bacterial infection, scalded skin syndrome, ecthyma gangrenosum, and toxic epidermal necrolysis; (c) mycotic ulcerations, such as those associated with superficial fungal infection or deep fungal infection; (d) spirochetal ulcerations, such as those associated with syphilis or yaws: (e) leishmaniasis; (f) mydriasis; or (g) cellulitis; (15) surgical ulcerations, such as those associated with closed incisions or excisions, open incisions or excisions, stab wounds, necrotic incisions or excisions, skin grafts, or donor sites; or (16) other ulcerations, such as those associated with skin tears (traumatic ulcerations), fistula, peristomal ulcerations, ulcerations associated with aplasia cutis congenita, ulcerations associated with epidermolysis bullosa, ulcerations associated with ectodermal dysplasias, ulcerations associated with congenital protein C or S deficiency, ulcerations associated with congenital erosive and vesicular dermatosis, ulcerations associated with acrodermatitis enteropathica, and amputation stump ulcerations. The layered phyllosilicate material of the present invention can also be used to promote wound healing in other conditions.
E. Other Therapeutic Uses
In addition, the layered phyllosilicate material can be used to treat a variety of other conditions. In one embodiment, the condition is a skin condition including, but not limited to, a bacterial skin condition, a microbial skin condition, a biofilm skin condition, an inflammatory skin condition, a hyperproliferative skin condition, a fungal skin condition, a viral skin condition, an autoimmune skin condition, an idiopathic skin condition, a hyperproliferative skin condition, a cancerous skin condition. Exemplary skin conditions include, but are not limited to a burn, eczema (including, but not limited to, atopic eczema, acrodermatitis continua, contact allergic dermatitis, contact irritant dermatitis, dyshidrotic eczema, pompholyx, lichen simplex chronicus, nummular eczema, seborrheic dermatitis, stasis eczema), erythroderma, an insect bite, mycosis fungoides, pyoderma gangrenosum, eythrema multiforme, rosacea, onychomycosis, acne (including, but not limited to, acne vulgaris, neonatal acne, infantile acne, pomade acne), psoriasis, Reiter's syndrome, pityriasis rubra pilaris, hyperpigmentation, vitiligo, scarring conditions, keloid, lichen planus, age-related skin disorder (including, but not limited to, wrinkles and cellulite) and hyperproliferative skin disorders, including, but not limited to, hyperproliferative variants of the disorders of keratinization (including, but not limited to, actinic keratosis, senile keratosis). As an example, the metal-containing material can be used prophylactically to reduce (e.g., prevent) the occurrence of a particular burn (e.g., a second degree burn) becoming a more severe burn (e.g., a third degree burn).
In another embodiment, the condition is a respiratory condition including, but not limited to a bacterial respiratory condition, a biofilm respiratory condition, a microbial respiratory condition, an inflammatory respiratory condition, a fungal respiratory condition, a viral respiratory condition, an autoimmune respiratory condition, an idiopathic respiratory condition, a hyperproliferative respiratory condition, a cancerous respiratory condition. Exemplary respiratory conditions include, but are not limited to, asthma, emphysema, bronchitis, pulmonary edema, acute respiratory distress syndrome, bronchopulmonary dysplasia, fibrotic conditions, pulmonary fibrosis, pulmonary atelectasis, tuberculosis, pneumonia, sinusitis, allergic rhinitis, pharyngitis, mucositis, stomatitis, chronic obstructive pulmonary disease, bronchiectasis, lupus pneumonitis and cystic fibrosis.
In another embodiment, the condition is a musculo-skeletal condition, including but not limited to, a bacterial musculo-skeletal condition, a biofilm musculo-skeletal condition, a microbial musculo-skeletal condition, an inflammatory musculo-skeletal condition, a fungal musculo-skeletal condition, a viral musculo-skeletal condition, an autoimmune musculo-skeletal condition, an idiopathic musculo-skeletal condition, a hyperproliferative musculo-skeletal condition, a cancerous musculo-skeletal condition. The musculo-skeletal condition can be, for example, a degenerative musculo-skeletal condition (including arthritis) or a traumatic musculo-skeletal condition (including a torn or damaged muscle). Exemplary musculo-skeletal conditions include, but are not limited to tendonitis, osteomyelitis, fibromyalgia, bursitis and arthritis.
In another embodiment, the condition is a circulatory condition including, but not limited to a bacterial circulatory condition, a biofilm circulatory condition, a microbial circulatory condition, an inflammatory circulatory condition, a fungal circulatory condition, a viral circulatory condition, an autoimmune circulatory condition, an idiopathic circulatory condition, a hyperproliferative circulatory condition, a cancerous circulatory condition. As referred to herein, circulatory conditions include lymphatic conditions. Examples of circulatory conditions include arteriosclerosis, lymphoma, septicemia, leukemia, ischemic vascular disease, lymphangitis and atherosclerosis.
In yet another embodiment, the condition is a mucosal or serosal condition including, but not limited to a bacterial mucosal or serosal condition, a biofilm mucosal or serosal condition, a microbial mucosal or serosal condition, an inflammatory mucosal or serosal condition, a fungal mucosal or serosal condition, a viral mucosal or serosal condition, an autoimmune mucosal or serosal condition, an idiopathic mucosal or serosal condition, a hyperproliferative mucosal or serosal condition, a cancerous mucosal or serosal condition. Exemplary mucosal or serosal conditions include, but are not limited to pericarditis, Bowen's disease, stomatitis, prostatitis, sinusitis, allergic rhinitis, digestive disorders, peptic ulcers, esophageal ulcers, gastric ulcers, duodenal ulcers, espohagitis, gastritis, enteritis, enterogastric intestinal hemorrhage, toxic epidermal necrolysis syndrome, Stevens Johnson syndrome, cystic fibrosis, bronchitis, pneumonia, pharyngitis, common cold, ear infections, sore throat, sexually transmitted diseases (including, but not limited to syphilis, gonorrhea, herpes, genital warts, HIV, chlamydia), inflammatory bowel disease, colitis, hemorrhoids, thrush, dental conditions, oral conditions, conjunctivitis, and periodontal conditions.
F. Combination Therapy Aspects
In one embodiment, a composition comprising a layered phyllosilicate material will comprise a further therapeutic agent. The therapeutic agent may be a small molecule or macromolecule such as peptide, protein or nucleic acid. In some embodiments, the further therapeutic agent is selected from the group consisting of carrageenan, anti-inflammatory agents, including hydrocortisone, prednisone, and the like; NSAIDS, including acetaminophen, salicylic acid, ibuprofen, and the like; selective COX-2 enzyme inhibitors, antibacterial agents, including colloidal silver, penicillin, erythromycin, polymyxin B, viomycin, chloromycetin, streptomycins, cefazolin, ampicillin, azactam, tobramycin, cephalosporins, bacitracin, tetracycline, doxycycline, gentamycin, quinolines, neomycin, clindamycin, kanamycin, metronidazole, and the like; antiparasitic agents including quinacrine, chloroquine, vidarabine, and the like; antifungal agents including nystatin, liposomal nystatin, amorolfine, butenafina, naftifine, terbinafine, flucytosine, fluconazole, itraconasole, ketoconazole, posaconazole, ravuconazole, voriconazole, clotrimazole, econasole, miconazole, oxiconazole, sulconazole, terconazole, ticonazole, nikkomycin Z, caspofungin, micafungin, amphotericin B (AmB), AmB lipid complex, AmB colloidal dispersion, pimaricin, griseofulvin, ciclopirox olamine, haloprogin, tolnaftate, undecylrnate; anti-virucides, and antiviral agents including acyclovir, docosanol, ribarivin, interferons, and the like; cellulose acetate, carbopol,carrageenan (CAS No. 9000-07-1), pleconaril, amantidine, rimantidine, fomivirsen, zidovudine, lamivudine, zanamivir, oseltamivir, brivudine, abacavir, adefovir, amprenavir, arbidol, atazanavir, atripla, cidofovir, combivir, edoxudine, efavirenz, emtricitabine, enfuvirtide, entecavir, famciclovir, fomivirsen, fosamprenavir, foscarnet, fosfonet, ganciclovir, gardasil, ibacitabine, imunovir, idoxuridine, imiquimod, indinavir, inosine, integrase inhibitor, lamivudine, lopinavir, loviride, mk-0518, maraviroc, moroxydine, nelfinavir, nevirapine, nexavir, nucleoside analogues, oseltamivir, penciclovir, peramivir, pleconaril, podophyllotoxin, ribavirin, rimantadine, ritonavir, saquinavir, stavudine, tenofovir, tenofovir disoproxil, tipranavir, trifluridine, trizivir, tromantadine, truvada, valaciclovir, valganciclovir, vicriviroc, vidarabine, viramidine, zalcitabine, zanamivir and zidovudine; systemic analgesic agents including salicylic acid, acetaminophen, ibuprofen, naproxen, piroxicam, flurbiprofen, morphine, and the like; local anesthetics including cocaine, lidocaine, bupivacaine, xylocaine, benzocaine, and the like; an antisense nucleotide, a thrombin inhibitor, an antithrombogenic agent, a tissue plasminogen activator, a thrombolytic agent, a fibrinolytic agent, a vasospasm inhibitor, a calcium channel blocker, a nitrate, a nitric oxide promoter, a vasodilator, an antimicrobial agent, an antibiotic, an anti-platelet agent, an anti-mitotic, a microtubule inhibitor, an actin inhibitor, a remodeling inhibitor, an agent for molecular genetic intervention, a cell cycle inhibitor, an inhibitor of the surface glycoprotein receptor, an anti-metabolite, an anti-proliferative agent, an anti-cancer chemotherapeutic agent, an anti-inflammatory steroid, an immunosuppressive agent, an antibiotic, a radiotherapeutic agent, iodine-containing compounds, barium-containing compounds, a heavy metal functioning as a radiopaque agent, a peptide, a protein, an enzyme, an extracellular matrix component, a cellular component, a biologic agent, an angiotensin converting enzyme (ACE) inhibitor, ascorbic acid, a free radical scavenger, an iron chelator, an antioxidant, a radiolabelled form or other radiolabelled form of any of the foregoing, or a mixture of any of these. Compositions comprising a layered phyllosilicate material and an antiviral agent as described herein (including acyclovir, docosanol, ribarvirin, oseltamivir phosphate and interferons) are specifically contemplated.
In some embodiments, the administration of a further anti-bacterial agent in conjunction with the administration of a layered phyllosilicate material described herein is specifically contemplated. Exemplary anti-bacterial agents include, but are not limited to, colloidal silver, penicillin, penicillin G, erythromycin, polymyxin B, viomycin, chloromycetin, streptomycins, cefazolin, ampicillin, methicillin, oxacillin, nafcillin, cloxacillin, dicloxacillin azactam, tobramycin, cephalosporins (including cephalothin, cefazolin, cephalexin, cephradine, cefamandole, cefoxitin, and 3rd-generation cephalosporins), Carbapenems (including imipenem, meropenem, Biapenem), bacitracin, tetracycline, doxycycline, gentamycin, quinolines, neomycin, clindamycin, kanamycin, metronidazole, treptogramins (including Quinupristin/dalfopristun (Synercid™)), Streptomycin , Ceftriaxone , Cefotaxime, Rifampin, Glycopeptides (including vancomycin, teicoplanin, LY-333328 (Ortivancin)), Macrolides (including erythromycin, clarithromycin, azithromycin, lincomycin, and clindamycun), Ketolides (including Telithromycin, ABT-773), Tetracyclines, Glycylcyclines (including Terbutyl-minocycline (GAR-936)), Aminoglycosides, Chloramphenicol, Imipenem-cilastatin, Glycopeptides (including oritavancin, LY-333328, dalbavancin), Fluoroquinolones (including ofloxacin, sparfioxacin, gemifloxacin, cinafloxacun (DU-6859a)) and other topoisomerase inhibitors, Trimethoprim-sulfamethoxazole (TMP-SMX), Ciprofloxacin, topical mupirocin, Oxazolidinones (including AZD-2563, Linezolid (Zyvox™)), Lipopeptides (including Daptomycin, Ramoplanin), ARBELIC (TD-6424) (Theravance), TD-6424 (Theravance), isoniazid (INN), rifampin (RIF), pyrazinamide (PZA), Ethambutol (EMB), Capreomycin, cycloserine, ethionamide (ETH), kanamycun, and p-aminosalicylic acid (PAS).
In some embodiments, the administration of a further anti-fungal agent in conjunction with the administration of a layered phyllosilicate material described herein is specifically contemplated. Exemplary anti-fungal agents include, but are not limited to, allylamines (e.g., Terbinafine) and other non-azole ergosterol biosynthesis inhibitors; antimetabolites (e.g., flucytosine); azoles (e.g., fluconazole, itraconazole, ketoconazole, ravuconazole, posaconazole, voriconazole); glucan synthesis inhibitors (e.g., caspofungin, micafungin, anidulafungin); polyenes (e.g., amphotericin B, amphotericin B lipid complex, amphotericin B colloidal dispersion, liposomal nystatin) and griseofulvin.
Combination therapy comprising a layered phyllosilicate material described herein and a therapeutic agent (e.g., an anti-viral agent, an anti-bacterial agent, anti-fungal agent, etc.) described herein for the treatment of a viral, bacterial or fungal infection is specifically contemplated. These compositions would be provided in a combined amount effective to inactivate the virus, bacteria or fungus causing the infection. This process may involve administering to a subject in need thereof a layered phyllosilicate material and a further therapeutic agent(s) at the same time. This may be achieved by administering a single composition or pharmacological formulation that includes both a layered phyllosilicate material and a furthertherapeutic agent, or by administering two distinct compositions or formulations, at the same time, wherein one composition includes a layered phyllosilicate material and the other includes a further therapeutic agent.
Alternatively, the treatment with the layered phyllosilicate material may precede or follow the treatment with the further therapeutic agent by intervals ranging from minutes to weeks. In embodiments where the layered phyllosilicate material and the further therapeutic agent are administered separately, one would generally ensure that a significant period of time did not expire between the times of each delivery, such that the further therapeutic agent and the layered phyllosilicate material would still be able to exert an advantageously combined effect. In such instances, it is contemplated that one would administer both modalities within about 12-24 hours of each other and, more preferably, within about 6-12 hours of each other, with a delay time of only about 12 hours being most preferred. In some situations, it may be desirable to extend the time period for treatment significantly, however, where several days (2, 3, 4, 5, 6 or 7) to several weeks (1, 2, 3, 4, 5, 6, 7 or 8) lapse between the respective administrations. Repeated treatments with one or both agents is specifically contemplated.
G. Other Medical Uses for the Layered Phyllosilicates
In yet another embodiment, a layered phyllosilicate material is utilized as a delivery vehicle. In one embodiment, the layered phyllosilicates are a delivery vehicle for nucleic acids and proteins. For example, binding of proteins to negatively-charged layered phyllosilicates can neutralize the charge and/or induce conformational changes of the proteins and thus promote their permeability and absorption through mucosal membranes. Similarly, nucleic acids (e.g., DNA, RNA, RNAi and antisense oligonucleotides) intercalated within positively-charged layered phyllosilicates can enter desired cells via phagocytosis and endocytosis and will also promote mucosal membrane absorption and permeability. In one embodiment, the layered phyllosilicates are the delivery vehicle. In other embodiments, the layered phyllosilicates are used in lieu of or in conjunction with other nucleic acid and protein delivery vehicles known in the art in order to increase the delivery potential and cell targeting or membrane permeability and absorption of these molecules. Exemplary nucleic acid and protein delivery vehicles known in the art include, but are not limited to, U.S. Pat. Nos. 7,098,032; 7,029,697; 6,962,686; 6,919,091; 6,916,490; 6,897,068; 6,890,556; 6,821,955; 6,764,853; 6,740,643; 6,475,995; 6,468,986; 6,458,382; 6,426,086; 6,409,990; 6,379,966; 6,383,478; 6,365,575; 6,344,436; 6,319,715; 6,287,857; 6,217,912; 6,207,456; 6,184,037; 6,077,835; 6,008,336; 5,972,900; 5,972,707; 5,948,878; 5,877,302; 5,844,107; 5,820,879; 5,759,519; 5,283,185; and U.S. Patent Application Publication Nos. 2006/0105371 2006/0084617, 2006/0051405, 2005/0265956, 2005/0260276, 2005/0234232, 2005/0123600, 2005/0090008, 2005/0027064, 2005/0008617, 2004/0156909, 2003/0199090, 2003/0026841, the disclosures of which are incorporated herein by reference in their entireties.
Binding of small molecule drugs to a layered phyllosilicate material can improve their delivery and absorption through mucosal membranes, including the ocular, dermal, nasal and intestinal membranes. Drug release from the layered phyllosilicates can be induced by pH, ionic strength changes, and/or in response to temperature, ionic current or ultrasound. In one embodiment, the layered phyllosilicates are the delivery vehicle. In other embodiments, the layered phyllosilicates are used in lieu of or in conjunction with other small molecule drug delivery vehicles known in the art in order to increase cell targeting membrane permeability and absorption. Exemplary small molecule drug delivery systems known in the art include, but are not limited to, those described in U.S. Pat. Nos. 6,838,528; 6,797,704; 6,730,334; 6,706,289; 6,482,439; 6,443,989; 6,383,478; 6,165,440; 5,780,044; 5,759,563; 5,565,215; and U.S. Patent Application Publication Nos. 2006/0193787; 2006/0149392; 2006/0105049; 2006/0057206; 2006/0034925; 2005/0266090; 2005/0260276; 2005/0249774; 2005/0220754; 2005/0058603, the disclosures of which are incorporated herein by reference in their entireties.
In other embodiments of the invention, a layered phyllosilicate material is used to coat, or is impregnated within, a device including medical stents and the like. For devices that are coated, the coating process is performed in such a manner as to (a) coat only one surface of device with the compositions of the invention or (b) coating all or parts of the device with the compositions of the invention.
The layered phyllosilicate material-based coating or device coated with the same is made sterile either by preparing the layered phyllosilicate material-based coating or device coated with the same under aseptic environment and/or may be terminally sterilized using methods known in the art, such as ethanol, ethylene oxide, gamma radiation or electron beam sterilization methods or a combination of both of these methods.
Thus, a therapeutic agent is advantageously delivered to adjacent tissues or tissues proximal to the implant site. In one aspect, the therapeutic agent is the layered phyllosilicate material. The layered phyllosilicates may be used alone or in combination with another therapeutic agent described herein. The therapeutic agent is capable of being released from the solid implanted matrix into adjacent or surrounding tissue fluids during biodegradation, bioerosion, or bioresorption of the fixation device.
Other agents also may be used in the coating compositions of the invention. Preferably, such agents are capable of preventing infection in the host, either systemically or locally at the defect site, are contemplated as illustrative useful additives. Exemplary additives include the therapeutic agents described herein.
Implantable device coatings made from the compositions of the invention may be used for delivering a specific therapeutic or other agent to an external portion (surface) of a body passageway or cavity. Examples of body passageways include arteries, veins, the heart, the esophagus, the stomach, the duodenum, the small intestine, the large intestine, biliary tracts, the ureter, the bladder, the urethra, lacrimal ducts, the trachea, bronchi, bronchiole, nasal airways, Eustachian tubes, the external auditory mayal, vas deferens and fallopian tubes. Examples of cavities include the abdominal cavity, the buccal cavity, the peritoneal cavity, the pericardial cavity, the pelvic cavity, perivisceral cavity, pleural cavity and uterine cavity.
Controlled drug delivery matrices can be in the form of a patch, implantable or insertable medical device incorporating drug intercalated layered phyllosilicates. Specific organic macromolecules such as surfactants and polymers can be used to provide the desired drug release rate. Suitable surfactants and polymers are well known to those skilled in the art. See, for example, U.S. Patent Application Publication No. 2005/0208122, the disclosure of which is incorporated herein by reference in its entirety.
In yet another embodiment, a layered phyllosilicate material as described herein is used to screen for drug candidates. For example, drug candidates can be adsorbed onto layered phyllosilicates and then used in receptor-binding studies to identify lead candidate molecules for drug development. Alternatively, drug receptors can be incorporated into layered phyllosilicates and then employed in drug-receptor binding studies, provided however, that adsorption of receptors onto bentonite clay does not alter their drug binding affinity.
In another embodiment, a layered phyllosilicate material is used as a substrate to adsorb certain membrane proteins and receptors from cell surfaces as part of a purification process (e.g., affinity chromatography). Affinity chromatography is used to separate proteins by selective adsorption onto and/or elution from a solid medium, generally in the form of a column. The solid medium is usually an inert carrier matrix to which is attached a ligand having the capacity to bind, under certain conditions, the target or desired protein or proteins over others present in the same sample, although in some cases the matrix itself may have such selective binding capacity. The ligand may be biologically complementary to the protein to be separated, for example, antigen and antibody, or may be any biologically unrelated molecule which, by virtue of the nature and steric relationship of its active groups, has the ability to bind the protein. Examples of commonly used affinity chromatography techniques include immobilized metal affinity chromatography (IMAC), sulfated affinity chromatography, dye affinity chromatography, and heparin affinity. In another example, the chromatographic medium may be prepared using one member of a binding pair, e.g., a receptor/ligand binding pair, or antibody/antigen binding pair (immunoaffinity chromatography).
In some embodiments, a layered phyllosilicate material is used for medical imaging by associating an imaging component with the layered phyllosilicate. The present invention is not limited by the nature of the imaging component used. In some embodiments, the imaging is based on the passive or active observation of local differences in density of selected physical properties of the investigated complex matter. These differences may be due to a different shape (e.g., mass density detected by atomic force microscopy), altered composition (e.g., radiopaques detected by X-ray), distinct light emission (e.g., fluorochromes detected by spectrophotometry), different diffraction (e.g., electron-beam detected by transmission electron microscopy), contrasted absorption (e.g., light detected by optical methods), or special radiation emission (e.g., isotope methods). Thus, quality and sensitivity of imaging depend on the property observed and on the technique used.
In one embodiment, imaging agents can be incorporated into layered phyllosilicates targeted to tumors to detect cancer. Such imaging agents include position emission tomography (PET) agents, computerized tomography (CT) agents, magnetic resonance imaging (MRI) agents, nuclear magnetic imaging agents (NMI), fluroscopy agents and ultrasound contrast agents. Diagnostic agents of interest include radioisotopes of such elements as iodine (I), including 123I, 125I, 131I, etc., barium (Ba), gadolinium (Gd), technetium (Tc), including 99Tc, phosphorus (P), including 31P, iron (Fe), manganese (Mn), thallium (Tl), chromium (Cr), including 51Cr, carbon (C), including 14C, or the like, fluorescently labeled compounds, etc.
In yet another embodiment, a layered phyllosilicate material is used as a diagnostic agent to detect and quantify certain analytes present in biological specimens including blood, plasma, saliva and urine. These analytes include small molecules or macromolecules such as proteins and enzymes, the levels of which are altered in disease states.
The layered phyllosilicate material either alone or in combination with a therapeutic agent as described herein can be administered by any route that delivers an effective dosage to the desired site of action, with acceptable (preferably minimal) side-effects. Numerous routes of administration are known, including for example, oral, rectal, vaginal, transmucosal, buccal or intestinal administration; parenteral delivery, including intraperitoneal, intramuscular, subcutaneous, intramedullary injections, as well as intrathecal, cutaneous or intradermal injections; respiratory or inhalation, nasal, pulmonary and topical application, including ocular and transdermal applications.
When used in the above or other treatments, a “therapeutically effective amount” or an “effective amount” of a layered phyllosilicate material or a composition comprising a layered phyllosilicate material means a sufficient amount of the layered phyllosilicate material is provided to treat disorders, at a reasonable benefit/risk ratio applicable to any medical treatment. It will be understood, however, that the total daily usage of the layered phyllosilicate material will be decided by the attending physician within the scope of sound medical judgment. The specific therapeutically effective dose level for any particular patient will depend upon a variety of factors including the disorder being treated and the severity of the disorder; activity of the specific compound employed; the specific composition employed; the age, body weight, general health, sex and diet of the patient; the time of administration, route of administration, and rate of excretion of the specific compound employed; the duration of the treatment; drugs used in combination or coincidental with the specific compound employed; and like factors well known in the medical arts. For example, it is well within the skill of the art to start doses of the compound at levels lower than required to achieve the desired therapeutic effect and to gradually increase the dosage until the desired effect is achieved.
The total daily dose of a layered phyllosilicate material administered to a subject range from about 0.001 to about 200 mg/kg/day. If desired, the effective daily dose may be divided into multiple doses for purposes of administration; consequently, single dose compositions may contain such amounts or submultiples thereof to make up the daily dose. The dosage regimen of a phyllosilicate composition alone or in combination as described herein to be used in antiviral treatment will be determined by the attending physician considering various factors which modify the action of the phyllosilicate, e.g., the patient's age, sex, and diet, the severity of any infection, time of administration and other clinical factors.
Oral dosage forms include tablets, capsules, caplets, solutions, suspensions and/or syrups, and may also comprise a plurality of granules, beads, powders or pellets that may or may not be encapsulated. Such dosage forms are prepared using conventional methods known to those in the field of pharmaceutical formulation and described in the pertinent texts, e.g., in Remington: The Science and Practice of Pharmacy, supra). Tablets and capsules represent the most convenient oral dosage forms, in which case solid pharmaceutical carriers are employed.
Tablets may be manufactured using standard tablet processing procedures and equipment. One method for forming tablets is by direct compression of a powdered, crystalline or granular composition containing the active agent(s), alone or in combination with one or more carriers, additives, or the like. As an alternative to direct compression, tablets can be prepared using wet-granulation or dry-granulation processes. Tablets may also be molded rather than compressed, starting with a moist or otherwise tractable material.
In addition to the layered phyllosilicate material alone or in combination as described herein, tablets prepared for oral administration will generally contain other materials such as binders, diluents, lubricants, disintegrants, fillers, stabilizers, surfactants, preservatives, coloring agents, flavoring agents and the like. Binders are used to impart cohesive qualities to a tablet, and thus ensure that the tablet remains intact after compression. Suitable binder materials include, but are not limited to, starch (including corn starch and pregelatinized starch), gelatin, sugars (including sucrose, glucose, dextrose and lactose), polyethylene glycol, propylene glycol, waxes, and natural and synthetic gums, e.g., acacia sodium alginate, polyvinylpyrrolidone, cellulosic polymers (including hydroxypropyl cellulose, hydroxypropyl methylcellulose, methyl cellulose, ethyl cellulose, hydroxyethyl cellulose, and the like), and Veegum. Diluents are typically necessary to increase bulk so that a practical size tablet is ultimately provided. Suitable diluents include dicalcium phosphate, calcium sulfate, lactose, cellulose, kaolin, mannitol, sodium chloride, dry starch and powdered sugar. Lubricants are used to facilitate tablet manufacture; examples of suitable lubricants include, for example, vegetable oils such as peanut oil, cottonseed oil, sesame oil, olive oil, corn oil, and oil of theobroma, glycerin, magnesium stearate, calcium stearate, and stearic acid. Disintegrants are used to facilitate disintegration of the tablet, and are generally starches, clays, celluloses, algins, gums or crosslinked polymers. Fillers include, for example, materials such as silicon dioxide, titanium dioxide, alumina, talc, kaolin, powdered cellulose and microcrystalline cellulose, as well as soluble materials such as mannitol, urea, sucrose, lactose, dextrose, sodium chloride and sorbitol. Stabilizers are used to inhibit or retard drug decomposition reactions that include, by way of example, oxidative reactions. Surfactants may be anionic, cationic, amphoteric or nonionic surface active agents.
The dosage form may also be a capsule, in which case the layered phyllosilicate material-containing composition may be encapsulated in the form of a liquid or solid (including particulates such as granules, beads, powders or pellets). Suitable capsules may be either hard or soft, and are generally made of gelatin, starch, or a cellulosic material, with gelatin capsules preferred. Two-piece hard gelatin capsules are preferably sealed, such as with gelatin bands or the like. (See, for e.g., Remington: The Science and Practice of Pharmacy, supra), which describes materials and methods for preparing encapsulated pharmaceuticals.
Solid dosage forms, whether tablets, capsules, caplets, or particulates, may, if desired, be coated so as to provide for delayed release. Dosage forms with delayed release coatings may be manufactured using standard coating procedures and equipment. Such procedures are known to those skilled in the art and described in the pertinent texts (See, for e.g., Remington: The Science and Practice of Pharmacy, supra). Generally, after preparation of the solid dosage form, a delayed release coating composition is applied using a coating pan, an airless spray technique, fluidized bed coating equipment, or the like. Delayed release coating compositions comprise a polymeric material, e.g., cellulose butyrate phthalate, cellulose hydrogen phthalate, cellulose proprionate phthalate, polyvinyl acetate phthalate, cellulose acetate phthalate, cellulose acetate trimellitate, hydroxypropyl methylcellulose phthalate, hydroxypropyl methylcellulose acetate, dioxypropyl methylcellulose succinate, carboxymethyl ethylcellulose, hydroxypropyl methylcellulose acetate succinate, polymers and copolymers formed from acrylic acid, methacrylic acid, and/or esters thereof.
Sustained release dosage forms provide for drug release over an extended time period, and may or may not be delayed release. Generally, as will be appreciated by those of ordinary skill in the art, sustained release dosage forms are formulated by dispersing a drug within a matrix of a gradually bioerodible (hydrolyzable) material such as an insoluble plastic, a hydrophilic polymer, or a fatty compound, or by coating a solid, drug-containing dosage form with such a material. Insoluble plastic matrices may be comprised of, for example, polyvinyl chloride or polyethylene. Hydrophilic polymers useful for providing a sustained release coating or matrix cellulosic polymers include, without limitation: cellulosic polymers such as hydroxypropyl cellulose, hydroxyethyl cellulose, hydroxypropyl methyl cellulose, methyl cellulose, ethyl cellulose, cellulose acetate, cellulose acetate phthalate, cellulose acetate trimellitate, hydroxypropylmethyl cellulose phthalate, hydroxypropylcellulose phthalate, cellulose hexahydrophthalate, cellulose acetate hexahydrophthalate, and carboxymethylcellulose sodium; acrylic acid polymers and copolymers, preferably formed from acrylic acid, methacrylic acid, acrylic acid alkyl esters, methacrylic acid alkyl esters, and the like, e.g. copolymers of acrylic acid, methacrylic acid, methyl acrylate, ethyl acrylate, methyl methacrylate and/or ethyl methacrylate, with a terpolymer of ethyl acrylate, methyl methacrylate and trimethylammonioethyl methacrylate chloride (sold under the tradename Eudragit RS) preferred; vinyl polymers and copolymers such as polyvinyl pyrrolidone, polyvinyl acetate, polyvinylacetate phthalate, vinylacetate crotonic acid copolymer, and ethylene-vinyl acetate copolymers; zein; and shellac, ammoniated shellac, shellac-acetyl alcohol, and shellac n-butyl stearate. Fatty compounds for use as a sustained release matrix material include, but are not limited to, waxes generally (e.g., carnauba wax) and glyceryl tristearate.
Although the present compositions may be administered orally, other modes of administration are contemplated as well. Exemplary modes of administration include transmucosal (e.g., U.S. Pat. Nos. 5,288,498; 6,248,760; 6,355,248; 6,548,490, the disclosures of which are incorporated herein by reference in their entireties), transurethral (e.g., e.g., U.S. Pat. Nos. 5,919,474 and 5,925,629, the disclosures of which are incorporated herein by reference in their entireties), vaginal or perivaginal (e.g., U.S. Pat. Nos. 4,211,679; 5,491,171 and 6,576,250, the disclosures of which are incorporated herein by reference in their entireties) and intranasal or inhalation (e.g., U.S. Pat. Nos. 4,800,878; 5,112,804; 5,179,079; 6,017,963; 6,391,318 and 6,815,424, the disclosures of which are incorporated herein by reference in their entireties). One of skill in the art would be able to modify a composition comprising a layered phyllosilicate material alone or in combination as described herein to be used in any of the modes of administration described herein.
The compositions comprising a layered phyllosilicate alone or in combination as described herein can also be used as a topical agent. Preferably, the topical agent is a solution, that is, a liquid formulation comprising the layered phyllosilicate material and a carrier. Other suitable forms include semi-solid or solid forms comprising a carrier indigenous to topical application and having a dynamic viscosity preferably greater than that of water, provided that the carrier does not deleteriously react with the layered phyllosilicate material in the composition. Suitable formulations include, but are not limited to, lip balms, suspensions, emulsions, creams, ointments, powders, liniments, salves and the like. If desired, these may be sterilized or mixed with auxiliary agents, including but not limited to, preservatives, stabilizers, wetting agents, buffers or salts for influencing osmotic pressure and the like well known in the art. Preferred vehicles for semi-solid or solid forms topical preparations include ointment bases, e.g., polyethylene glycol-1000 (PEG-1000); conventional ophthalmic vehicles; creams, (e.g., HEB cream); and gels, (e.g., K-Y gel, Miglyol® Gel B, Miglyol® Gel T, and Miglyol® 840 Gel B); as well as petroleum jelly and the like. These topical preparations may also contain emollients, perfumes, and/or pigments to enhance their acceptability for various usages, provided that the additives do not deleteriously react with the layered phyllosilicate material in the composition.
Also suitable for topical application are sprayable aerosol preparations wherein the layered phyllosilicate material, preferably in combination with a solid or liquid inert carrier material, is packaged in a squeeze bottle or in admixture with a pressurized volatile, normally gaseous propellant, e.g., a Freon (chlorofluorocarbon) or environmentally acceptable volatile propellant. Such compositions can be used for application to environmental surfaces, e.g., examining tables, toilet seats and the like, and/or for application to the skin or to mucous membranes. The aerosol or spray preparations can contain solvents, buffers, surfactants, perfumes, and/or antioxidants in addition to the layered phyllosilicate material of the invention.
The compositions of this invention can be employed in mixture with conventional excipients, i.e., pharmaceutically acceptable organic or inorganic carrier substances suitable for topical application which do not deleteriously react with the acid or the alcohol in the composition. The compositions of the invention can also include diluents, fillers, salts, buffers, stabilizers, solubilizers, and other materials well known in the art (Remington's Pharmaceutical Sciences 16th edition, Osol, A. Ed. (1980).
The composition also may be formulated as a dispersable powder for dusting the skin, hair, fur, or feathers of humans or animals. The compositions of the invention may also be in the form of oil-in-water emulsions. The oily phase may be a vegetable oil, for example olive oil or arachis oil, or a mineral oil, for example liquid paraffin or mixtures of these. Suitable emulsifying agents may be naturally-occurring gums, for example gum acacia or gum tragacanth, naturally-occurring phosphatides, for example soy bean, lecithin, and esters or partial esters derived from fatty acids and hexitol anhydrides, for example sorbitan monooleate, and condensation products of the said partial esters with ethylene oxide, for example polyoxyethylene sorbitan monooleate. The emulsions may also contain sweetening and flavoring agents and scent enhancers.
The layered phyllosilicate material of the invention can be administered in a concentration (w/v) ranging from about 0.1% to about 20%, or from about 1% to about 10%, or in a concentration of about 2%, about 3%, about 4%, about 5%, about 6%, about 7%, about 8%, about 9%, about 10%, about 11%, about 12%, about 13%, about 14%, about 15%, about 16%, about 17%, about 18%, about 19% or about 20%.
In related variations of the preceding embodiments, a composition comprising a layered phyllosilicate material alone or in combination as described herein may be so arranged, e.g., in a kit or package or unit dose, to permit co-administration with one or more other therapeutic agents, but the layered phyllosilicate material composition and the agent are not in admixture. In another aspect, the layered phyllosilicate material composition and the agent are in admixture. In some embodiments, the two components to the kit/unit dose are packaged with instructions for administering the two agents to a human subject for treatment of one of the above-indicated disorders and diseases. The kit may comprise the composition of the invention in combination with a vehicle in a cream or gel base, as a pump-spray, as an aerosol, on an impregnated bandage, a medicated animal ear tag or collar, or in a dropper. The composition of the invention may also be in any one of the above formulations in combination with a second agent, including but not limited to antiviral agents, topical steroids, aloe vera and the like cosmeceuticals. In one aspect, the kit includes applicator for administering the composition. The composition of the invention may also be in any one of the above formulations in combination with a second agent, including but not limited to antibacterial agents (including colloid silver), antiviral agents, topical steroids, aloe vera and the like cosmeceuticals, Aerosil®, Cab-O-Sil® and Miglyol® Gels (including Miglyol® Gel B, Miglyol® Gel T, and Miglyol® 840 Gel B, SASOL Germany GmbH).
With respect to diagnostic applications of layered phyllosilicates, suitable diagnostic kits and reagents known in the art can be employed. This may include incorporation of the layered phyllosilicates into a diagnostic dipstick or a device followed by certain color, conductivity or electric current changes upon contact with a biological specimen.
Materials and methods of the invention can be practiced on animals of economic value, to treat animal viral infections and other skin conditions. Treatment of any domestic pet animal, livestock, zoo animals, circus animals, endangered species, and the like is specifically contemplated.
Poxviridae virus infection occurs in many animal species important as livestock or pets, causing disease in these animals similar to human disease, which at times can result in serious side effects to the animal or livestock industry. For example, the Cowpox virus which is harbored originally in rodents, can spread to cats, cows, humans, and zoo animals, including large cats and elephants. Transmission to humans traditionally occurs via contact with the infected teats of milking cows. However, infections are currently seen more commonly among domestic cats, from which cowpox can be transmitted to humans. Cowpox infection is a self-limiting disease resulting in vesicles and pustules of the hands in humans and similar areas in animals.
Pseudocowpox virus, the agent of pseudocowpox (Milker's nodules, paravaccinia), causes an epithelial cell infection in handlers of cows. Orf virus infection results in painful lesions on the skin of sheep, and goats, and can be serious for lambs whose mouth lesions stop them from feeding. Sheep pox and goat pox may be fatal infections, with visceral as well as dermal lesions. Seal pox may result in a severe skin and flipper infection of captive and wild seals. Myxomatosis infects rabbits, and is typically fatal to the infected animal. Yaba monkey tumor virus causes a histiocytoma, or subcutaneous tumorlike growths, of the head or limbs of primates, especially African monkeys, which are often seen in zoos and are important in biological studies. Tanapox virus causes tanapox, a self-limiting epithelial cell infection in primates. Other viruses include pig pox, cat pox, camel pox, Fowl pox, pigeon pox, canary pox, and Ectromelia, which infects mice.
Other aspects and advantages of the present invention will be understood upon consideration of the following illustrative examples, which are not intended to be limiting in any way.
Example 1 demonstrates the ion exchange process of smectite clay from a Ca form or Na/Ca mixed forms to Na-rich smectite clay.
Raw smectite clay was dispersed into water to make a 3 wt % clay slurry. This clay has a Na content of 0.20 wt % and Ca content of 2.10 wt %. The elemental analysis was measured by an X-ray fluorescence method. The mixture was mixed thoroughly with a mechanical mixer. The pH value of the starting clay slurry is 7-8. An ion exchange resin, such as Amberlite 200C Na, is available from Rohm & Hass packed in a glass column with a 2-in diameter and a 20-in length. A liquid pump was used to pump the clay slurry through the column at 20 ml/min. Elemental analysis of the finished clay, dried from the slurry, indicated that the Na content is 3.45 wt % and Ca content is 0.17 wt %. The ion exchanged clay is called El-Na-Clay. This clay had a basal spacing of 13 Å.
Example 1A demonstrates the ion exchange process of smectite clay from the purified sodium form produced in Example 1 to a hydrogen protonated clay.
Purified sodium montmorillonite was dispersed into filtered deionized water to make a 3 wt % clay slurry. The clay slurry was mixed thoroughly with a Silverson homogenizer. The pH value of the starting montmorillonite slurry was about 10. A proton ion exchange resin, Amberlite FPC23 H (Rohm & Hass), was packed into two glass columns with a 2-in diameter and a 20-in length; one inch of space was left at the top of each column to promote flowability of the beads. The purified sodium montmorillonite clay slurry was slowly mixed using a 3-inch dispersion blade while a liquid pump was used to pump the montmorillonite clay slurry through two proton exchange resin packed columns at 20 ml/min. The pH of the resulting protonated clay slurry was 2.3 after passing through the second column. Analytical results indicate complete proton exchange of the montmorillonite clay.
Example 2 demonstrates the formation of protonated Octadecyl ammonium-treated smectite clay with Octadecyl ammonium acetate from the ion exchanged Na-smectite clay (E1-Na-clay) of Example 1.
100-g of sodium smectite clay El-Na-clay was dispersed into 3000 ml water through a mechanical mixer. This clay slurry was heated to 80° C. 41.5 g of Octadecyl ammonium acetate from KAO Chemicals was added into the clay slurry. The clay showed excellent flocculation after the addition of the Octadecyl ammonium acetate. The pH of the clay reaction slurry was about 4. The clay was filtered with regular quantitative filter paper with the assistance of a mechanical vacuum pump. Then, the clay was dried in an oven over night at 80° C. and ground to pass through a 300-mesh screen as a fine powder. This modified clay was called E2-ODA-Clay.
Example 3 demonstrates the formation of protonated Octadecyl ammonium-treated smectite clay with a solution of Octadecyl ammonium ions in dilute HCl. (E3-ODA-Clay). This sample was measured by powder X-ray diffraction to determine the clay basal spacing after ion exchange. The result is listed in Table-1.
100-g of sodium smectite E1-Na-clay was dispersed into 3000 ml water through a mechanical mixer. This clay slurry was heated to 80° C. 33.8 g of Octadecyl amine was added into 1000 ml of 70° C. water and then mixed with 17.1 g of 10.5 N HCl. The Octadecyl amine-HCl solution was added into the clay slurry followed by mixing. The reaction slurry had a pH of 4. The clay showed excellent flocculation after the addition of the Octadecyl amine-HCl solution. The clay was filtered with regular quantitative filter paper with the assistance of a mechanical vacuum pump. Then, the clay was dried in an oven over night at 80° C. and ground to pass through a 300-mesh screen as a fine powder. This modified clay was called E3-ODA-Clay. This sample was measured by powder X-ray diffraction to determine the clay basal spacing after ion exchange. The result is listed in Table 2.
In this study, three different compositions of bentonite clay were studied (R-0088, R-0089, and R-0090) to evaluate their adsorption and antiviral efficacy against an HIV-1 virus (Retroscreen Virology Ltd). Each bentonite clay composition was studied at three different concentrations (0.01% w/v, 0.001% w/v, and 0.0001% w/v) prepared in sterile double-distilled water) and at three different incubation times (1 minute, 5 minutes, and 10 minutes). Test compositions composed of various mineral clays and controls (as listed below) were prepared.
HIV-1IIIB (AL307 with a titer of 104TCID5O/ml) was supplied from the Retroscreen Virology Ltd virus repository. Virucidal and P24 assays were carried out as set out below to evaluate antiviral activity. The p24 antigen assay measures the viral capsid (core) p24 protein in blood that is detectable earlier than HIV antibody during acute infection.
1. 40 μl of the viral stock solution was added to each concentration of test compound (360 μl) and left to incubate at room temperature for the incubation times specified above.
2. The reaction was terminated by the addition of cell infection media (3.6 ml), which diluted the reaction 10-fold.
1. The samples were left to settle for 1.5 hours before being added to the P24 antigen coated plates.
2. 200 μl of each sample was added to the assay plate.
3. 110 μl of neat stock virus (AL307) was added to the relevant wells on the plate.
4. Empigen (final concentration of 0.8%) was added to all these wells.
5. The neat stock virus was titrated across the wells following a 10-fold dilution series in RPMI-1640 containing 1% Empigen.
6. The P24 assay was then conducted as instructed in the current Retroscreen Virology Ltd. SOP.
Only R-0088 at 0.01% w/v concentration reduced the viral titer of HIV-1IIIB at the 10 minute incubation time with 99.13% efficacy exhibited. Virucidal results for R-0088 demonstrated that a time-response is exhibited by the 0.01% w/v concentration. At this concentration, the reduction in the HIV1IIIB virus titer was significant at the 10 minute incubation time with a reduction of 2.29 logs. A reduction of ≧1−log10 TCID50/ml (Oxford et al, Antiv. Chem. Chemother. 5:176-181, 1994) is deemed significant for the virucidal assays used in this study, and is equivalent to ≧90% reduction in viral titer. Virucidal results for R-0089 and R-0091 did not demonstrate significant reductions in HIV-1IIIB titer.
At the highest test concentration (0.01% w/v), R-0088 exhibited a significant reduction in the HIV-1IIIB (AL307 with a titer of 104TCID50/ml). R-0089 and R-0091 did not exhibit significant reductions in the HIV1IIIB virus titer for any of the variables tested.
This study was performed to determine whether the test compounds have virucidal efficacy against an epidemic strain of Influenza A virus and to assess the cytotoxic potential of the test compounds on Madin-Darby canine kidney cells (MDCK) cells. Three different compositions of bentonite clay (R-0088, R-0089, and R-0090) were studied to evaluate their adsorption and antiviral efficacy against an Influenza A/Panama/2007/99 (H3N2) virus.
Test compositions composed of various mineral clays and controls (as listed below) were prepared.
Each bentonite clay mixture was studied at three different concentrations (0.01% w/v, 0.001% w/v, and 0.0001% w/v prepared in sterile double-distilled water) and at five different incubation times (30 seconds, 1 minute, 5 minutes, 10 minutes, and 30 minutes).
The cells of the toxicity controls were incubated with cell maintenance media, whereas the cells of the virucidal controls were incubated with cell infection media. The stock titer of Influenza A/Panama/2007/99 virus was 7.7 log10 TCID50/ml. Before use in the virucidal assay, the stock virus was diluted 100-fold in infection media. It was then diluted a further 2-fold when it was added to the reaction mixture (section 9.3.2, step 4). The resulting test titer was therefore 5.4 log10 TCID50/ml. The protocols for the toxicity assay and the virucidal assay are set out below.
1. Cells (100 μl/well) at 1×105 cells/ml were seeded onto 96-well plates and incubated at 37° C. for ˜24 hours.
2. The cell maintenance media on the plates was removed and the cell monolayer washed twice with PBS (100 μl/well).
3. Each test compound (100 μl/well) was added, in quadruplicate, to the plate and left to incubate at room temperature for the various times specified.
4. The test compounds were removed and the cell monolayer washed twice with phosphate buffered saline (PBS) (100 μl/well).
5. Cell maintenance media (100 μl/well) was added to the cell monolayer and the plates incubated at 37° C. for ˜24 hours
6. A crystal violet assay was performed on the plates in accordance to the Retroscreen Virology Ltd. SOP VA024-01.
Controls utilized in the toxicity assay were:
1. Cells (100 μl/well) at 1×105 cells/ml were seeded onto 96-well plates and incubated at 37° C. for ˜24 hours.
2. The cell maintenance media on the plates was removed and the cell monolayer washed twice with PBS (100 μl/well).
3. Cell infection media (100 μl/well) was added to the plates.
4. Diluted virus (200 μl) of 1/2000 viral stock solution was added to each test compound (200 μl) and left to incubate at room temperature for the various incubation times specified.
5. The reaction was terminated by the addition of cell infection media (3.6 ml), which diluted the reaction 10-fold.
6. The termination mixture was centrifuged (4000 rpm for 10 minutes) and the supernatant harvested.
7. The cell infection media in wells B4-B11 of the 96-well plate was removed. The supernatant (111 μl/well) was added to wells B8-B11, and the cell only control was added to wells B4-B7. Both were plated in quadruplicate.
8. The plates were incubated at 37° C. and 5% CO2 for 2 days.
9. On day 2 post-infection, the plates were scored for viral cytopathic effect (vCPE) and a hemagglutination (HA) assay was performed as per Retroscreen Virology Ltd. SOP VA018-02.
Controls utilized in the virucidal assay were:
The virucidal results demonstrate that a time-response was exhibited by R-0088 at the 0.01% w/v concentration only. At this concentration, the reductions in the Influenza A/Panama/2007/99 virus titer by R-0088 were only significant for the 10 and 30 minute incubation times. R-0089 and R-0090 did not demonstrate significant reductions in the Influenza A/Panama/2007/99 virus titer.
Thus, at the highest test concentration (0.01% w/v), R-0088 exhibited a significant reduction in the Influenza A/Panama/2007/99 virus titer at the 10 and 30 minute incubation times. R-0089 and R-0090 did not exhibit significant reductions in the Influenza A/Panama/2007/99 virus titer for any of the variables tested.
This study was performed to determine whether additional test compounds have virucidal efficacy against an epidemic strain of Influenza A virus and to assess the cytotoxic potential of these test compounds on Madin-Darby canine kidney cells (MDCK) cells. Three different compositions of bentonite clay were studied (R-100, R-101, and R-102) to evaluate their adsorption and antiviral efficacy against an Influenza A/Panama/2007/99 (H3N2) virus.
Test compositions composed of various mineral clays (as listed below) were prepared.
Each bentonite clay mixture was studied at three different concentrations (0.01% w/v, 0.001% w/v, and 0.0001% w/v prepared in sterile double-distilled water) and at three different incubation times (10 minutes, 30 minutes, and 60 minutes).
The cells of the toxicity controls were incubated with cell maintenance media, whereas the cells of the virucidal controls were incubated with cell infection media. The stock titer of Influenza A/Panama/2007/99 virus was 7.4 log10 TCID50/ml. Before use in the virucidal assay, the stock virus was diluted 2000-fold in infection media. It was then diluted a further 2-fold when it was mixed with the test compounds, a further 10-fold when it was mixed with the anti-viral control. The protocols for the toxicity assay and the virucidal assay are set out below.
The toxicity assay was performed as set out in Example 2 except for one modification; in step (1) of the assay, cells were seeded at (100 μl/well) at 5×104 cells/ml.
Controls utilized in the toxicity assay were:
1. Cells (100 μl/well) at 5×104 cells/ml or 7x104 cells/ml were seeded onto 96-well plates and incubated at 37° C. for ˜24 hours.
2. The cell maintenance media on the plates was removed and the cell monolayer washed twice with PBS (100 μl/well).
3. Cell infection media (100 μl/well) was added to the plates.
4. Diluted virus (200 μl) of 1/2000 viral stock solution was added to each test compound (200 μl) and left to incubate at room temperature for the various times specified. (For the antiviral control, 40 μl of the diluted virus was added to 360 μl of citrate buffer.)
5. The reaction was terminated by the addition of cell infection media (3.6 ml), which diluted the reaction 10-fold.
6. The termination mixture was centrifuged (4000 rpm for 10 minutes) and the supernatant harvested.
7. The cell infection media in wells B4-B11 of the 96-well plate was removed. The supernatant (111 μl/well) was added to wells B8-B11, and the virus only control ( 1/2000 viral stock solution) was added to wells B4-B7. Both were plated in quadruplicate.
8. The plates were incubated at 37° C. and 5% CO2 for 2-3 days.
9. On day 2 or 3 post-infection, the plates were scored for vCPE and an HA assay was performed as per Retroscreen Virology Ltd. SOP VA018-02.
Controls utilized in the virucidal assay were:
For the virucidal assay only, the test compounds were prepared at double the concentrations than those described above. This is due to the 2-fold dilution they underwent when they were mixed with the virus.
R-100, R-101, and R-102 all exhibited time-dependent response toxicity against MDCK cells. R-100, R-101, and R-102 all exhibited a dose-response activity against Influenza A/Panama/2007/99. All the test concentrations of each test compound exhibited time-dependent response activity against Influenza A/Panama/2007/99. Only the highest test concentration (0.01% w/v) of each test compound exhibited significant reductions in virus titer at every incubation time tested.
The toxicity data generated shows that a time-response, and not a dose-response, was exhibited by the test compounds. This confirms earlier research that the incubation time rather than the test compound concentration is the determining factor of toxicity. It was also observed that the survivability of MDCK cells was also affected by the diluent control, as the values generated for the diluent control and the test compounds were similar.
After examining all the data examining toxicity, viral reduction, and therapeutic index, it was determined that there was a difference between the test compounds, but this difference was only marked when at a concentration of 0.01% w/v. As there was a difference between the toxicity of the test compounds, this suggested that the diluent, which remained consistent between the test compounds, has minimal toxicity. Toxicity and reductions in viral titer increased between R-100, R-101, and R-102 respectively. However small changes in percent toxicity for the 0.01% w/v concentration for all the test compounds had considerable impacts on the therapeutic index values.
In summary, R-102 at the highest concentration (0.01% w/v) affected the greatest reduction in viral titer with the highest therapeutic index.
In this study, three different compositions of bentonite clay were studied (R-400, R-401, and R-402) to evaluate their antiviral efficacy against a Feline Calcivirus (a surrogate for Norovirus) (ATCC VR-782).
Test substances.
R-400: purified homoionic sodium bentonite mixture, purified in accordance with U.S. Pat. No. 6,050,509
R-401: purified homoionic hydrogen (protonated) bentonite mixture
R-402: purified homoionic hydrogen (protonated) bentonite #2 mixture
Each of the test substances were dispersed in double distilled water at a concentration of 0.1% (w/v) prior to use in the following assays.
Virus and Preparation of Stock Virus. The F-9 strain of the Feline Calcivirus stock virus was obtained from the American Type Culture collection, Manassas, Va. (ATCC VR-782). Stock virus was prepared by collecting the supernatant culture fluid from infected culture cells. The cells were disrupted and cell debris removed by centrifugation at 2000 RPM for five minutes at 4° C. The supernatant was removed, aliquoted, and the high titer stock virus was stored at ≦−70° C. until the day of use. On the day of use, five aliquots of stock virus (ATS Labs Lot FC-33) were removed, thawed, combined and refrigerated until use in the assay. The stock virus culture contained 5% fetal bovine serum (FBS) as the organic soil load. The stock virus tested demonstrated cytopathic effects (CPE) typical of Feline Calcivirus on feline kidney cells.
Test Cell Cultures. Cultures of feline kidney (CRFK) cells were originally obtained from the American Type Culture collection, Manassas, Va. (ATCC CCL-94). The cells were propagated, seeded into multiwell cell culture plates and maintained at 36-38° C. in a humidified atmosphere of 5-7% CO2.
Test Medium. The test medium used in the following assays was Minimum Essential Medium (MEM), supplemented with 5% heat-inactivated fetal bovine serum (FBS), 10 μg/mL gentamicin, 100 U/mL penicillin, and 2.5 μg/mL amphotericin B.
Preparation of Test Substance. Each of R-400, R-401 and R-402 were shaken vigorously by hand for three minutes, aliquoted and utilized immediately in the following assays.
Treatment of Virus Suspension. For each exposure temperature (room temperature and 37° C.), a 4.5 mL aliquot of test substance was dispensed into separate sterile 15 mL conical tubes and mixed with a 0.5 mL aliquot of the stock virus suspension. The mixtures were vortex mixed for ten seconds and held for the remainder of the specified 30 second exposure time at room temperature (actual 24.5° C.) and at 37±1° C. (actual 37.0° C.). Immediately following the exposure time, a 0.1 mL aliquot was removed from each tube and the mixtures were titered by 10-fold serial dilution (0.1 mL+0.9 mL test medium). To decrease the test substance cytotoxicity, the first dilution was made in FBS with the remaining dilutions in test medium. Each assay was then assayed for the presence of the virus.
Treatment of Virus control: A 0.5 mL aliquot of stock virus suspension was exposed for 30 seconds to a 4.5 mL aliquot of test medium in lieu of test substance at exposure temperatures of 24.5° C. and 37.1° C. Immediately following the exposure time, a 0.1 mL aliquot was removed from each tube and the mixtures were titered by 10-fold serial dilution (0.1 mL+0.9 mL test medium). All controls employed the FBS neutralized as described in the Treatment of Virus Suspension section. The virus control titer was used as a baseline to compare the percent and log reductions of each test parameter following exposure to the test substances.
Cytotoxicity Controls. A 4.5 mL aliquot of each test substance was mixed with a 0.5 mL aliquot of test medium containing 5% FBS in lieu of virus and treated as previously described for each exposure temperature assayed. The cytotoxicity of the cell cultures was scored at the same time as virus-test substance and virus control cultures. Cytotoxicity was graded on the basis of cell viability as determined microscopically. Cellular alterations due to toxicity were graded and reported as toxic (T) if greater than or equal to 50% of the monolayer was affected.
Neutralization Controls. Each cytotoxicity control mixture was challenged with low titer stock virus to determine the dilution(s) of test substance at which virucidal activity, if any, was retained. Dilutions that showed virucidal activity were not considered in determining reduction of the virus by the test substance.
Neutralization Assay. As described above, 0.1 mL of each test and control parameter following the exposure time period was added to FBS (0.9 mL) followed immediately by 10-fold serial dilutions in test medium to stop the action of the test substance. To determine if the neutralizer chose for the assay was effective in diminishing the virucidal activity of the test substance, low titer stock virus was added to each dilution of the test substance-neutralizer mixture. The mixtures were assayed for the presence of virus.
Infectivity Assay. The CRFK cell line, which exhibits CPE in the presence of Feline Calcivirus, was used as the indicator cell line in the infectivity assays. Cells in multiwell culture dishes were inoculated in quadruplicate with 0.1 mL of the dilutions prepared from test and control groups. Uninfected indicator cell cultures (cell controls) were inoculated with test medium alone. The cultures were incubated at 31-35° C. in a humidified atmosphere of 5-7% CO2 in sterile disposable cell culture lab ware. The cultures were microscopically scored periodically for seven days for the absence or presence of CPE, cytotoxicity, and for viability.
Results for Test Substances R-400, R-401 and R-402. Following a 30 second exposure time at room temperature (24.5° C.), test virus infectivity was detected in the virus-test substance mixture at 7.0 log 10. Test substance cytotoxicity was detected at 3.5 log 10. The neutralization control demonstrated that the test substance was neutralized at ≦2.5 log 10. Taking the cytotoxicity and neutralization control results into consideration, R-400 demonstrated an 82.2% reduction (at 24.5° C.) and a ≧96.8% reduction (at 37.0° C.) in viral titer following a 30 second exposure time to the virus. The log reductions in viral titer were 0.75 log 10 and ≧1.5 log 10, respectively. R-401 demonstrated a 43.8% reduction (at 24.5° C.) and a ≧96.8% reduction (at 37.0° C.) in viral titer following a 30 second exposure time to the virus. The log reduction in viral titers was 0.25 log 10 and ≧1.5 log 10, respectively. R-0402 demonstrated a 68.4% reduction (at 24.5° C.) and a ≧96.8% reduction (at 37.0° C.) in viral titer following a 30 second exposure time to the virus. The log reductions in viral titer were 0.5 log 10 and ≧1.5 log 10, respectively.
In this study, three different compositions of bentonite clay were studied (R-400, R-401, and R-402) to evaluate their adsorption and antiviral efficacy against Rotavirus.
Test substances.
R-400: purified homoionic sodium bentonite mixture, purified in accordance with U.S. Pat. No. 6,050,509
R-401: purified homoionic hydrogen (protonated) bentonite mixture
R-402: purified homoionic hydrogen (protonated) bentonite #2 mixture
Each of the test substances were dispersed in double distilled water at a concentration of 0.1% (w/v) prior to use in the following assays.
Virus and Preparation of Stock Virus. The WA strain of Rotavirus was obtained from the University of Ottawa, Ontario, Canada. Stock virus was prepared by collecting the supernatant culture fluid from infected culture cells. The cells were disrupted and cell debris removed by centrifugation at 2000 RPM for five minutes at approximately 4° C. The supernatant was removed, aliquoted, and the high titer stock virus was stored at ≦−70° C. until the day of use. On the day of use, five aliquots of stock virus (ATS Labs Lot XR-115) were removed, thawed, combined and refrigerated until use in the assay. The stock virus culture contained 5% fetal bovine serum (FBS) as the organic soil load. The stock virus tested demonstrated cytopathic effects (CPE) typical of Rotavirus on MA-104 cells.
Test Cell Cultures. Cultures of MA-104 (Rhesus monkey kidney) cells were originally obtained from Diagnostics Hybrids Inc., Athens, Ohio. The cells were propagated, seeded into multiwell cell culture plates and maintained at 36-38° C. in a humidified atmosphere of 5-7% CO2.
Test Medium. The test medium used in the following assays was serum free Minimum Essential Medium (MEM), supplemented with 0.5 μg/mL trypsin, 2.0 mM L-glutamine, 10 μg/mL gentamicin, 100 U/mL penicillin, and 2.5 μg/mL amphotericin B.
Preparation of Test Substance. Each of R-400, R-401 and R-402 were shaken vigorously by hand for three minutes, aliquoted and utilized immediately in the following assays.
Treatment of Virus Suspension. For each exposure temperature (room temperature and 37° C.), a 4.5 mL aliquot of test substance was dispensed into separate sterile 15 mL conical tubes and mixed with a 0.5 mL aliquot of the stock virus suspension. The mixtures were vortex mixed for ten seconds and held for the remainder of the specified 30 second exposure time at room temperature (actual 24.5° C.) and at 37±1° C. (actual 38.0° C.). Immediately following the exposure time, a 0.01 mL aliquot was removed from each tube and the mixtures were titered by 10-fold serial dilution (0.1 mL+0.9 mL test medium). To decrease the test substance cytotoxicity, the first dilution was made in FBS with the remaining dilutions in test medium. Each assay was then assayed for the presence of the virus.
Treatment of Virus Control: A 0.5 mL aliquot of stock virus suspension was exposed for 30 seconds to a 4.5 mL aliquot of test medium in lieu of test substance at exposure temperatures of 24.5° C. and 38.0° C. Immediately following the exposure time, a 0.1 mL aliquot was removed from each tube and the mixtures were titered by 10-fold serial dilution (0.1 mL+0.9 mL test medium). All controls employed the FBS neutralized as described in the Treatment of Virus Suspension section. The virus control titer was used as a baseline to compare the percent and log reductions of each test parameter following exposure to the test substances.
Cytotoxicity Controls. A 4.5 mL aliquot of each test substance was mixed with a 0.5 mL aliquot of test medium containing 5% FBS in lieu of virus and treated as previously described for each exposure temperature assayed. The cytotoxicity of the cell cultures was scored at the same time as virus-test substance and virus control cultures. Cytotoxicity was graded on the basis of cell viability as determined microscopically. Cellular alterations due to toxicity were graded and reported as toxic (T) if greater than or equal to 50% of the monolayer was affected.
Neutralization Controls. Each cytotoxicity control mixture was challenged with low titer stock virus to determine the dilution(s) of test substance at which virucidal activity, if any, was retained. Dilutions that showed virucidal activity were not considered in determining reduction of the virus by the test substance.
Neutralization Assay. As described above, 0.1 mL of each test and control parameter following the exposure time period was added to FBS (0.9 mL) followed immediately by 10-fold serial dilutions in test medium to stop the action of the test substance. To determine if the neutralizer chose for the assay was effective in diminishing the virucidal activity of the test substance, low titer stock virus was added to each dilution of the test substance-neutralizer mixture. The mixtures were assayed for the presence of virus.
Infectivity Assay. The MA-104 cell line, which exhibits CPE in the presence of Rotavirus, was used as the indicator cell line in the infectivity assays. Cells in multiwell culture dishes were inoculated in quadruplicate with 0.1 mL of the dilutions prepared from test and control groups. Uninfected indicator cell cultures (cell controls) were inoculated with test medium alone. The inoculum was allowed to adsorb for 60 minutes at 36-38° C. in a humidified atmosphere of 5-7% CO2. Following the adsorption period, a 1.0 mL aliquot of test medium was added to each well of the cell cultures, and the cultures were incubated at 36-38° C. in a humidified atmosphere of 5-7% CO2 in sterile disposable cell culture lab ware. The cultures were microscopically scored periodically for seven days for the absence or presence of CPE, cytotoxicity, and for viability.
Infectivity Results for Test Substances R-400, R-401 and R-402. Following a 30 second exposure time at room temperature (24.5° C.), test virus infectivity was detected in the virus-test substance mixture at 7.25 log 10. Test substance cytotoxicity was detected at 3.5 log 10. The neutralization control demonstrated that the test substance was neutralized at ≦2.5 log 10. Taking the cytotoxicity and neutralization control results into consideration, R-400 demonstrated no reduction in viral titer following a 30 second exposure time to the virus at 24.5° C. or 38.0° C. R-401 also demonstrated no reduction in viral titer following a 30 second exposure time to the virus at 24.5° C. or 38.0° C. R-0402, however, demonstrated a 68.4% reduction (at 24.5° C.) and a ≧99.7% reduction (at 38.0° C.) in viral titer following a 30 second exposure time to the virus. The log reductions in viral titer were 0.5 log 10 and ≧2.5 log 10, respectively.
In this study, three different compositions of bentonite clay were studied (R-400, R-401, and R-402) to evaluate their adsorption and antiviral efficacy against Influenza A virus.
Test substances.
R-400: purified homoionic sodium bentonite mixture, purified in accordance with U.S. Pat. No. 6,050,509
R-401: purified homoionic hydrogen (protonated) bentonite mixture R-402: purified homoionic hydrogen (protonated) bentonite #2 mixture
Each of the test substances were dispersed in double distilled water at a concentration of 0.1% (w/v) prior to use in the following assays.
Virus and Preparation of Stock Virus. The Hong Kong strain of Influenza A virus was obtained from the American Type Culture Collection, Manassas, Va. (ATCC VR-544). Stock virus was prepared by collecting the supernatant culture fluid from infected culture cells. The cells were disrupted and cell debris removed by centrifugation at 2000 RPM for five minutes at approximately 4° C. The supernatant was removed, aliquoted, and the high titer stock virus was stored at ≦−70° C. until the day of use. On the day of use, two aliquots of stock virus (ATS Labs Lot F66) were removed, thawed, combined and refrigerated until use in the assay. The stock virus culture contained 1% fetal bovine serum (FBS) as the organic soil load. The stock virus tested demonstrated cytopathic effects (CPE) typical of Influenza virus on Rhesus monkey kidney cells.
Test Cell Cultures. Rhesus monkey kidney (RMK) cells were originally obtained from VioMed Laboratories, Inc., Minneapolis, Minn., Cell Culture Division. Culturew were maintained and used as monolayers in disposable tissue culture labware. On the day of testing, cells were observed as having proper cell integrity.
Test Medium. The test medium used in the following assays was Minimum Essential Medium (MEM), supplemented with 1% (v/v) heat-inactivated fetal bovine serum (FBS), 10 μg/mL gentamicin, 100 U/mL penicillin, and 2.5 μg/mL amphotericin B.
Preparation of Test Substance. Each of R-400, R-401 and R-402 were shaken vigorously by hand for three minutes, aliquoted and utilized immediately in the following assays.
Treatment of Virus Suspension. A 4.5 mL aliquot of test substance was dispensed into separate sterile 15 mL conical tubes and mixed with a 0.5 mL aliquot of the stock virus suspension. The mixtures were vortex mixed for ten seconds and held for the remainder of the specified 30 second exposure time at room temperature (actual 24.0° C.). Immediately following the exposure period, a 0.1 mL aliquot was removed from each tube and the mixtures were titered by 10-fold serial dilutions (0.1 mL+0.9 mL test medium). To decrease the test substance cytotoxicity, the first dilution was made in FBS with the remaining dilutions in test medium. Each dilution was then assayed for the presence of the virus.
Treatment of Virus Control: A 0.5 mL aliquot of stock virus suspension was exposed for 30 seconds to a 4.5 mL aliquot of test medium in lieu of test substance at 24.0° C. Immediately following the exposure time, a 0.1 mL aliquot was removed from each tube and the mixtures were titered by 10-fold serial dilutions (0.1 mL+0.9 mL test medium). All controls employed the FBS neutralized as described in the Treatment of Virus Suspension section. The virus control titer (7.25 log10) was used as a baseline to compare the percent and log reductions of each test parameter following exposure to the test substances.
Cytotoxicity Controls. A 4.5 mL aliquot of each test substance was mixed with a 0.5 mL aliquot of test medium containing 1% FBS in lieu of virus and treated as previously described for the exposure temperature assayed. The cytotoxicity of the cell cultures was scored at the same time as virus-test substance and virus control cultures. Cytotoxicity was graded on the basis of cell viability as determined microscopically. Cellular alterations due to toxicity were graded and reported as toxic (T) if greater than or equal to 50% of the monolayer was affected.
Neutralization Controls. Each cytotoxicity control mixture was challenged with low titer stock virus to determine the dilution(s) of test substance at which virucidal activity, if any, was retained. Dilutions that showed virucidal activity were not considered in determining reduction of the virus by the test substance.
Neutralization Assay. As described above, 0.1 mL of each test and control parameter following the exposure time period was added to FBS (0.9 mL) followed immediately by 10-fold serial dilutions in test medium to stop the action of the test substance. To determine if the neutralizer chosen for the assay was effective in diminishing the virucidal activity of the test substance, low titer stock virus was added to each dilution of the test substance-neutralizer mixture. The mixtures were assayed for the presence of virus.
Infectivity Assay. The RMK cell line, which exhibits CPE in the presence of Influenza A virus, was used as the indicator cell line in the infectivity assays. Cells in multi-well culture dishes were inoculated in quadruplicate with 0.1 mL of the dilutions prepared from test and control groups. Uninfected indicator cell cultures (cell controls) were inoculated with test medium alone. The cultures were incubated at 36-38° C. in a humidified atmosphere of 5-7% CO2 in sterile disposable cell culture lab ware. The cultures were microscopically scored periodically for seven days for the absence or presence of CPE, cytotoxicity, and for viability.
Antiviral Results for Test Substance R-400, R-401 and R-402. Following a 30 second exposure time at room temperature (24.5° C.), test virus infectivity was detected in the virus-test substance mixture (virus control) at 7.25 log10.
Cytotoxicity of R-400 was detected at 3.5 log10. The neutralization control demonstrated that the test substance was neutralized at ≦2.5 log10. Following exposure, test virus infectivity was detected in the virus-test substance mixture at 7.75 log10. Therefore, R-400 demonstrated no reduction in viral titer following a 30 second exposure time to the virus at 24.0° C.
Cytotoxicity of R-401 was detected at 2.5 log10. The neutralization control demonstrated that the test substance was neutralized at ≦2.5 log10. Following exposure, test virus infectivity was detected in the virus-test substance mixture at 7.0 log10. Therefore, R-401 also demonstrated no reduction in viral titer following a 30 second exposure time to the virus at 24.0° C.
Cytotoxicity of R-402 was detected at 3.5 log10. The neutralization control demonstrated that the test substance was neutralized at ≦2.5 log10. Following exposure, test virus infectivity was detected in the virus-test substance mixture at 4.5 log10. Therefore, R-402 demonstrated a 99.8% (2.75 log10) reduction in viral titer following a 30 second exposure time to the virus at 24.0° C.
In this study, three different compositions of bentonite clay were studied (R-400, R-401, and R-402) to evaluate their adsorption and antiviral efficacy against Rhinovirus type 37.
Test substances.
R-400: purified homoionic sodium bentonite mixture, purified in accordance with U.S. Pat. No. 6,050,509
R-401: purified homoionic hydrogen (protonated) bentonite mixture
R-402: purified homoionic hydrogen (protonated) bentonite #2 mixture
Each of the test substances were dispersed in double distilled water at a concentration of 0.1% (w/v) prior to use in the following assays.
Virus and Preparation of Stock Virus. The 151-1 strain of Rhinovirus type 37 was obtained from the American Type Culture Collection, Manassas, Va. (ATCC VR-51147). Stock virus was prepared by collecting the supernatant culture fluid from infected culture cells. The cells were disrupted and cell debris removed by centrifugation at 2000 RPM for five minutes at approximately 4° C. The supernatant was removed, aliquoted, and the high titer stock virus was stored at ≦−70° C. until the day of use. On the day of use, two aliquots of stock virus (ATS Labs LotR37-104) were removed, thawed, combined and refrigerated until use in the assay. The stock virus culture contained 1% fetal bovine serum (FBS) as the organic soil load. The stock virus tested demonstrated cytopathic effects (CPE) typical of Rhinovirus on human embryonic lung cells.
Test Cell Cultures. Cultures of human embryonic lung (MRC-5) cells were originally obtained from American Type Culture Collection, Manassas, Va. (ATCC CCL-171). The cells were propagated, seeded into multi-well cell culture plates and maintained at 36-38° C. in a humidified atmosphere of 5-7% CO2.
Test Medium. The test medium used in the following assays was Minimum Essential Medium (MEM), supplemented with 10% (v/v) heat-inactivated fetal bovine serum (FBS), 10 μg/mL gentamicin, 100 U/mL penicillin, and 2.5 μg/mL amphotericin B.
Preparation of Test Substance. Each of R-400, R-401 and R-402 were shaken vigorously by hand for three minutes, aliquoted and utilized immediately in the following assays.
Treatment of Virus Suspension. A 4.5 mL aliquot of test substance was dispensed into a separate sterile 15 mL conical tube and mixed with a 0.5 mL aliquot of the stock virus suspension. The mixtures were vortex mixed for ten seconds and held for the remainder of the specified 30 second exposure time at room temperature (actual 24.0° C.). Immediately following the exposure period, a 0.1 mL aliquot was removed from each tube and the mixture was titered by 10-fold serial dilutions (0.1 mL+0.9 mL test medium). To decrease the test substance cytotoxicity, the first dilution was made in FBS with the remaining dilutions in test medium. Each dilution was then assayed for the presence of the virus.
Treatment of Virus Control: A 0.5 mL aliquot of stock virus suspension was exposed for 30 seconds to a 4.5 mL aliquot of test medium in lieu of test substance at 24.0° C. Immediately following the exposure time, a 0.1 mL aliquot was removed from each tube and the mixtures were titered by 10-fold serial dilutions (0.1 mL+0.9 mL test medium). All controls employed the FBS neutralizer as described in the Treatment of Virus Suspension section. The virus control titer (5.0 log10) was used as a baseline to compare the log reduction of each test parameter following exposure to the test substances.
Cytotoxicity Controls. A 4.5 mL aliquot of each test substance was mixed with a 0.5 mL aliquot of test medium containing 1% FBS in lieu of virus and treated as previously described for the exposure temperature assayed. The cytotoxicity of the cell cultures was scored at the same time as virus-test substance and virus control cultures. Cytotoxicity was graded on the basis of cell viability as determined microscopically. Cellular alterations due to toxicity were graded and reported as toxic (T) if greater than or equal to 50% of the monolayer was affected.
Neutralization Controls. Each cytotoxicity control mixture was challenged with low titer stock virus to determine the dilution(s) of test substance at which virucidal activity, if any, was retained. Dilutions that showed virucidal activity were not considered in determining reduction of the virus by the test substance.
Neutralization Assay. As described above, 0.1 mL of each test and control parameter following the exposure time period was added to FBS (0.9 mL) followed immediately by 10-fold serial dilutions in test medium to stop the action of the test substance. To determine if the neutralizer chosen for the assay was effective in diminishing the virucidal activity of the test substance, low titer stock virus was added to each dilution of the test substance-neutralizer mixture. The mixtures were assayed for the presence of virus.
Infectivity Assay. The MRC-5 cell line, which exhibits CPE in the presence of Rhinovirus type 37, was used as the indicator cell line in the infectivity assays. Cells in multi-well culture dishes were inoculated in quadruplicate with 0.1 mL of the dilutions prepared from test and control groups. Uninfected indicator cell cultures (cell controls) were inoculated with test medium alone. The cultures were incubated at 36-38° C. in a humidified atmosphere of 5-7% CO2 in sterile disposable cell culture lab ware. The cultures were microscopically scored periodically for seven days for the absence or presence of CPE, cytotoxicity, and for viability.
Antiviral Results for Test Substance R-400, R-401 and R-402. Following a 30 second exposure time at room temperature (24.5° C.), test virus infectivity was detected in the virus-test substance mixture (virus control) at 5.0 log10.
Cytotoxicity of R-400 was detected at 2.5 log10. The neutralization control demonstrated that the test substance was neutralized at ≦2.5 log10. Following exposure, test virus infectivity was detected in the virus-test substance mixture at 5.0 log10. Therefore, R-400 demonstrated no reduction in viral titer following a 30 second exposure time to the virus at 24.0° C.
Cytotoxicity of R-401 was detected at 2.5 log10. The neutralization control demonstrated that the test substance was neutralized at ≦2.5 log10. Following exposure, test virus infectivity was detected in the virus-test substance mixture at 5.0 log10. Therefore, R-401 also demonstrated no reduction in viral titer following a 30 second exposure time to the virus at 24.0° C.
Cytotoxicity of R-402 was detected at 3.5 log10. The neutralization control demonstrated that the test substance was neutralized at ≦2.5 log10. Following exposure, test virus infectivity was not detected in the virus-test substance mixture (≦2.5 log10). Therefore, R-402 demonstrated a ≧99.7% (≦2.5 log10) reduction in viral titer following a 30 second exposure time to the virus at 24.0° C.
In this study, three different compositions of bentonite clay were studied (R-400, R-401, and R-402) to evaluate their virucidal efficacy against Influenza A virus.
Test substances.
R-400: purified homoionic sodium bentonite mixture, purified in accordance with U.S. Pat. No. 6,050,509
R-401: purified homoionic hydrogen (protonated) bentonite mixture
R-402: purified homoionic hydrogen (protonated) bentonite #2 mixture
Each of the test substances were dispersed in double distilled water at a concentration of 0.1% (w/v) prior to use in the following assays.
Virus and Preparation of Stock Virus. The Hong Kong strain of Influenza A virus was obtained from the American Type Culture Collection, Manassas, Va. (ATCC VR-544). Stock virus was prepared by collecting the supernatant culture fluid from infected culture cells. The cells were disrupted and cell debris removed by centrifugation at 2000 RPM for five minutes at approximately 4° C. The supernatant was removed, aliquoted, and the high titer stock virus was stored at ≦−70° C. until the day of use. On the day of use, two aliquots of stock virus (ATS Labs Lot F66) were removed, thawed, combined and refrigerated until use in the assay. The stock virus culture contained 1% fetal bovine serum (FBS) as the organic soil load. The stock virus tested demonstrated cytopathic effects (CPE) typical of Influenza virus on Rhesus monkey kidney cells.
Test Cell Cultures. Rhesus monkey kidney (RMK) cells were originally obtained from VioMed Laboratories, Inc., Minneapolis, Minn., Cell Culture Division. Cultures were maintained and used as monolayers in disposable tissue culture lab ware. On the day of testing, cells were observed as having proper cell integrity.
Test Medium. The test medium used in the following assays was Minimum Essential Medium (MEM), supplemented with 1% (v/v) heat-inactivated fetal bovine serum (FBS), 10 μg/mL gentamicin, 100 U/mL penicillin, and 2.5 μg/mL amphotericin B.
Preparation of Test Substance. Each of R-400, R-401 and R-402 were shaken vigorously by hand for three minutes, aliquoted and utilized immediately in the following assays.
Preparation of Virus Films. Films of virus were prepared by spreading 0.2 mL of virus inoculum uniformly over the bottoms of four separate 100×15 mm sterile glass petri dishes. The virus films were dried at 19° C. in a relatively humidity of 53% until visibly dry (approximately 25 minutes).
Sephadex Gel Filtration. To reduce the cytotoxic level of the virus-test substance mixture prior to assay of virus and/or to reduce the virucidal level of the test substance, virus was separated from test substance by filtration through Sephadex gel. Columns of Sephadex LH-20-100 were equilibrated with PBS containing 1% albumin and centrifuged or three minutes to clear the void volume.
Treatment of Virus Films with Test Substance. For each test substance, separate dried virus films were exposed to 2.0 mL of the use dilution for one minute at room temperature (20.0° C.). The virus films were completely covered with the test substance. Following the exposure time, the plates were scraped with a cell scraper to re-suspend the contents of the plate and the virus-test substance mixture was immediately passed through a Sephadex column utilizing a syringe plunger in order to detoxify the mixture. The filtrate (10−1 dilution) was then titered by 10-fold serial dilution and assayed for infectivity.
Treatment of Virus Control Films. A virus film was prepared as described above. The control film was exposed to 2.0 mL of test medium for one minute at room temperature (20.0° C.). The virus was then scraped and passed through a Sephadex column as described above. The filtrate (10−1 dilution) was then titered by 10-fold serial dilution and assayed for infectivity.
Cytotoxicity Assay. A 2.0 mL aliquot of the use dilution of each test substance was filtered through a Sephadex column and the filtrate was diluted serially in medium and inoculated into RMK cell cultures. Cytotoxicity of the RMK cell cultures was scored at the same time as the virus-test substance and virus control cultures.
Assay on Non-Virucidal Level of Test Substance. Each dilution of the Sephadex-filtered test substance was mixed with an aliquot of low titer stock virus, and the resulting mixtures of dilutions were assayed for infectivity in order to determine the dilution(s) of test substance at which virucidal activity, if any, was retained. Dilutions that showed virucidal activity were not considered in determining the reduction in infectivity by the test substance.
Infectivity Assay. The RMK cell line, which exhibits CPE in the presence of Influenza A virus, was used as the indicator cell line in the infectivity assays. Cells in multi-well culture dishes were inoculated in quadruplicate with 0.1 mL of the dilutions prepared from test and control groups. Uninfected indicator cell cultures (cell controls) were inoculated with test medium alone. The cultures were incubated at 36-38° C. in a humidified atmosphere of 5-7% CO2 in sterile disposable cell culture lab ware. The cultures were microscopically scored periodically for seven days for the absence or presence of CPE, cytotoxicity, and for viability.
Virucidal Results for Test Substance R-400, R-401 and R-402. Results of tests with R-0400, R-0401 and R-0402 exposed to Influenza A virus in the presence of a 5% fetal bovine serum soil load at 20.0° C. for one minute are set forth below. All cell controls were negative for test virus infectivity. The titer of the dried virus control was 5.75 log10.
Following exposure, test virus infectivity was detected in the virus-test substance mixture at 2.5 log10 for test substance R-0400, 5.25 log 10 for test substance R-0401 and 1.0 log10 for test substance R-0402.
Test substance cytotoxicity was observed in test substance R-0400 at 1.5 log10 and in test substance R-0401 at 2.5 log 10. Test substance cytotoxicity was not observed in test substance R-0402 at any dilution tested (≦0.5 log 10).
The neutralization control (non-virucidal level of the test substance) indicates that the test substance R-0400 was neutralized at ≦1.5 log10, test substance R-0401 was neutralized at ≦2.5 log10 and test substance R-0402 was neutralized at ≦0.5 log10.
Taking the cytotoxicity and neutralization control results into consideration, the reduction in viral titer was 3.25 log10 for test substance R-0400, 0.5 log10 for test substance R-0401 and 4.75 log10 for test substance R-0402. Therefore, none of the test substances demonstrated complete inactivation of Influenza A virus following a one minute exposure time at 20.0° C. as required by the U.S. Environmental Protection Agency (EPA) for virucidal label claims.
In this study, three different compositions of bentonite clay were studied (R-400, R-401, and R-402) to evaluate their virucidal efficacy against Rhinovirus type 37.
Test substances.
R-400: purified homoionic sodium bentonite mixture, purified in accordance with U.S. Pat. No. 6,050,509
R-401: purified homoionic hydrogen (protonated) bentonite mixture
R-402: purified homoionic hydrogen (protonated) bentonite #2 mixture
Each of the test substances were dispersed in double distilled water at a concentration of 0.1% (w/v) prior to use in the following assays.
Virus and Preparation of Stock Virus. The 151-1 strain of Rhinovirus type 37 was obtained from the American Type Culture Collection, Manassas, Va. (ATCC VR-1147). Stock virus was prepared by collecting the supernatant culture fluid from infected culture cells. The cells were disrupted and cell debris removed by centrifugation at 2000 RPM for five minutes at approximately 4° C. The supernatant was removed, aliquoted, and the high titer stock virus was stored at ≦−70° C. until the day of use. On the day of use, two aliquots of stock virus (ATS Labs Lot R37-105) were removed, thawed, combined and refrigerated until use in the assay. The stock virus culture contained 1% fetal bovine serum (FBS) as the organic soil load. The stock virus tested demonstrated cytopathic effects (CPE) typical of Rhinovirus on human embryonic lung cells.
Test Cell Cultures. Cultures of human embryonic lung (MRC-5) cells were originally obtained from American Type Culture Collection, Manassas, Va. (ATCC CCL-171). The cells were propagated, seeded into multi-well cell culture plates and maintained at 36-38° C. in a humidified atmosphere of 5-7% CO2.
Test Medium. The test medium used in the following assays was Minimum Essential Medium (MEM), supplemented with 10% (v/v) heat-inactivated fetal bovine serum (FBS), 10 μg/mL gentamicin, 100 U/mL penicillin, and 2.5 μg/mL amphotericin B.
Preparation of Test Substance. Each of R-400, R-401 and R-402 were shaken vigorously by hand for three minutes, aliquoted and utilized immediately in the following assays.
Preparation of Virus Films. Films of virus were prepared by spreading 0.2 mL of virus inoculum uniformly over the bottoms of four separate 100×15 mm sterile glass petri dishes. The virus films were dried at 18.5° C. in a relatively humidity of 56% until visibly dry (approximately 20 minutes).
Sephadex Gel Filtration. To reduce the cytotoxic level of the virus-test substance mixture prior to assay of virus and/or to reduce the virucidal level of the test substance, virus was separated from test substance by filtration through Sephadex gel. Columns of Sephadex LH-20-100 were equilibrated with PBS containing 1% albumin and centrifuged or three minutes to clear the void volume.
Treatment of Virus Films with Test Substance. For each test substance, separate dried virus films were exposed to 2.0 mL of the use dilution for one minute at room temperature (19.5° C.). The virus films were completely covered with the test substance. Following the exposure time, the plates were scraped with a cell scraper to re-suspend the contents of the plate and the virus-test substance mixture was immediately passed through a Sephadex column utilizing a syringe plunger in order to detoxify the mixture. The filtrate (10−1 dilution) was then titered by 10-fold serial dilution and assayed for infectivity.
Treatment of Virus Control Films. A virus film was prepared as described above. The control film was exposed to 2.0 mL of test medium for one minute at room temperature (20.0° C.). The virus was then scraped and passed through a Sephadex column as described above. The filtrate (10−1 dilution) was then titered by 10-fold serial dilution and assayed for infectivity.
Cytotoxicity Assay. A 2.0 mL aliquot of the use dilution of each test substance was filtered through a Sephadex column and the filtrate was diluted serially in medium and inoculated into MRC-5 cell cultures. Cytotoxicity of the RMK cell cultures was scored at the same time as the virus-test substance and virus control cultures.
Assay on Non-Virucidal Level of Test Substance. Each dilution of the Sephadex-filtered test substance was mixed with an aliquot of low titer stock virus, and the resulting mixtures of dilutions were assayed for infectivity in order to determine the dilution(s) of test substance at which virucidal activity, if any, was retained. Dilutions that showed virucidal activity were not considered in determining the reduction in infectivity by the test substance.
Infectivity Assay. The MRC-5 cell line, which exhibits CPE in the presence of Rhinovirus type 37, was used as the indicator cell line in the infectivity assays. Cells in multi-well culture dishes were inoculated in quadruplicate with 0.1 mL of the dilutions prepared from test and control groups. Uninfected indicator cell cultures (cell controls) were inoculated with test medium alone. The cultures were incubated at 31-35° C. in a humidified atmosphere of 5-7% CO2 in sterile disposable cell culture lab ware. The cultures were microscopically scored periodically for seven days for the absence or presence of CPE, cytotoxicity, and for viability.
Virucidal Results for Test Substance R-400, R-401 and R-402. Results of tests with R-0400, R-0401 and R-0402, exposed to Rhinovirus type 37 in the presence of a 5% fetal bovine serum soil load at 19.5° C. for one minute are discussed below. All cell controls were negative for test virus infectivity. The titer of the dried virus control was 5.5 log10.
Following exposure, test virus infectivity was not detected in the virus-test substance mixture for test substance R-0402 at any dilution tested (≦0.5 log10). Test virus infectivity was detected in the virus-test substance mixture at 2.5 log10 for test substance R-0400 and at 3.75 log10 for test substance R-0401.
Test substance cytotoxicity was observed in test substances R-0400 and R-0402 at 1.5 log10 and in test substance R-0401 at 2.5 log10. The neutralization control (non-virucidal level of the test substance) indicates that the test substances R-0400 and R-0402 were neutralized at ≦1.5 log10 and test substance R-0401 was neutralized at ≦2.5 log10. Taking the cytotoxicity and neutralization control results into consideration, the reduction in viral titer was 3.0 log10 for test substance R-0400, 1.75 log10 for test substance R-0401 and ≧4.0 log10 for test substance R-0402. Accordingly, it was determined that both R-400 and R-401 failed to demonstrate complete inactivation of Rhinovirus type 37. However, results indicated that R-402 demonstrated complete inactivation of Rhinovirus type 37 as required by the U.S. EPA for virucidal label claims. Therefore, the use of R-402 as a virucidal component in a composition is specifically contemplated.
In this study, three different compositions of bentonite clay were studied (R-400, R-401, and R-402) to evaluate their virucidal efficacy against Herpes Simplex Virus-1 (HSV-1)
Test substances.
R-400: purified homoionic sodium bentonite mixture, purified in accordance with U.S. Pat. No. 6,050,509
R-401: purified homoionic hydrogen (protonated) bentonite mixture
R-402: purified homoionic hydrogen (protonated) bentonite #2 mixture
Each of the test substances were dispersed in double distilled water at a concentration of 0.1% (w/v) prior to use in the following assays.
Virus and Preparation of Stock Virus. The F1 strain of Herpes simplex virus type 1 (HSV-1) was obtained from the American Type Culture Collection, Manassas, Va. (ATCC VR-733). Stock virus was prepared by collecting the supernatant culture fluid from infected culture cells. The cells were disrupted and cell debris removed by centrifugation at 2000 RPM for five minutes at approximately 4° C. The supernatant was removed, aliquoted, and the high titer stock virus was stored at ≦−70° C. until the day of use. On the day of use, two aliquots of stock virus (ATS Labs Lot R37-105) were removed, thawed, combined and refrigerated until use in the assay. The stock virus culture contained 1% fetal bovine serum (FBS) as the organic soil load. The stock virus tested demonstrated cytopathic effects (CPE) typical of Herpes simplex virus on rabbit kidney cells.
Test Cell Cultures. Rabbit kidney (RK) cells were obtained from ViroMed Laboratories, Inc., Cell Culture Division. Cultures were maintained and used as monolayers in disposable tissue culture lab ware. On the day of testing, cells were observed as having proper cell integrity.
Test Medium. The test medium used in the following assays was Minimum Essential Medium (MEM), supplemented with 5% (v/v) heat-inactivated fetal bovine serum (FBS), 10 μg/mL gentamicin, 100 U/mL penicillin, and 2.5 μg/mL amphotericin B.
Preparation of Test Substance. Each of R-400, R-401 and R-402 were shaken vigorously by hand for three minutes, aliquoted and utilized immediately in the following assays.
Preparation of Virus Films. Films of virus were prepared by spreading 0.2 mL of virus inoculum uniformly over the bottoms of four separate 100×15 mm sterile glass petri dishes. The virus films were dried at 19.9° C. in a relatively humidity of 70% until visibly dry (approximately 20 minutes).
Sephadex Gel Filtration. To reduce the cytotoxic level of the virus-test substance mixture prior to assay of virus and/or to reduce the virucidal level of the test substance, virus was separated from test substance by filtration through Sephadex gel. Columns of Sephadex LH-20-100 were equilibrated with PBS containing 1% albumin and centrifuged for three minutes to clear the void volume.
Treatment of Virus Films with Test Substance. For each test substance, separate dried virus films were exposed to 2.0 mL of the use dilution for one minute at room temperature (19.9° C.). The virus films were completely covered with the test substance. Following the exposure time, the plates were scraped with a cell scraper to re-suspend the contents of the plate and the virus-test substance mixture was immediately passed through a Sephadex column utilizing a syringe plunger in order to detoxify the mixture. The filtrate (10−1 dilution) was then titered by 10-fold serial dilution and assayed for infectivity.
Treatment of Virus Control Films. A virus film was prepared as described above. The control film was exposed to 2.0 mL of test medium for one minute at room temperature (19.9° C.). The virus was then scraped and passed through a Sephadex column as described above. The filtrate (10−1 dilution) was then titered by 10-fold serial dilution and assayed for infectivity.
Cytotoxicity Assay. A 2.0 mL aliquot of the use dilution of each test substance was filtered through a Sephadex column and the filtrate was diluted serially in medium and inoculated into RK cell cultures. Cytotoxicity of the RK cell cultures was scored at the same time as the virus-test substance and virus control cultures.
Assay on Non-Virucidal Level of Test Substance. Each dilution of the Sephadex-filtered test substance was mixed with an aliquot of low titer stock virus, and the resulting mixtures of dilutions were assayed for infectivity in order to determine the dilution(s) of test substance at which virucidal activity, if any, was retained. Dilutions that showed virucidal activity were not considered in determining the reduction in infectivity by the test substance.
Infectivity Assay. The RK cell line, which exhibits CPE in the presence of HSV-1, was used as the indicator cell line in the infectivity assays. Cells in multi-well culture dishes were inoculated in quadruplicate with 0.1 mL of the dilutions prepared from test and control groups. Uninfected indicator cell cultures (cell controls) were inoculated with test medium alone. The cultures were incubated at 36-38° C. in a humidified atmosphere of 5-7% CO2 in sterile disposable cell culture lab ware. The cultures were microscopically scored periodically for seven days for the absence or presence of CPE, cytotoxicity, and for viability.
Virucidal Results for Test Substance R-400, R-401 and R-402. Results of tests with R-0400, R-0401 and R-0402, exposed to HSV-1 in the presence of a 5% fetal bovine serum soil load at 19.9° C. for one minute are discussed below. All cell controls were negative for test virus infectivity. The titer of the dried virus control was 6.25 log10.
Following exposure, test virus infectivity was not detected in the virus-test substance mixture for test substance R-0402 at any dilution tested (≦0.5 log10). Test virus infectivity was detected in the virus-test substance mixture at 3.5 log10 for test substance R-0400 and at 3.25 log10 for test substance R-0401.
Test substance cytotoxicity was not observed in test substances R-0400 and R-0402 at any dilution tested (≦1.5 log10). Test substance cytotoxicity was observed in R-401 at 2.5 log10. The neutralization control (non-virucidal level of the test substance) indicates that the test substances R-0400 and R-0402 were neutralized at ≦0.5 log10 and test substance R-0401 was neutralized at ≦2.5 log10. Taking the cytotoxicity and neutralization control results into consideration, the reduction in viral titer was 2.75 log10 for test substance R-0400, 3.0 log10 for test substance R-0401 and ≧5.75 log10 for test substance R-0402. Accordingly, it was determined that both R-400 and R-401 failed to demonstrate complete inactivation of Rhinovirus type 37. However, results indicated that R-402 demonstrated complete inactivation of Rhinovirus type 37 as required by the U.S. EPA for virucidal label claims. Therefore, this example further supports the use of R-402 as a virucidal component in a composition.
The following experiment was performed to determine the therapeutic effects of various layered phyllosilicate materials in a guinea pig prophylactic model of genital herpes.
Preparation of test compounds:
3J49-1: Protonated montmorillonite (2.5% solids) was diluted in half with 0.2 micron filtered water. Methylparaben and propylparaben were added at 0.2 wt % and 0.02 wt % respectively using silverson homogenizer at about 2000 rpm. When dissolved, Carbopol Ultrez-10 at 0.3 wt % was added slowly under gentle agitation at 1000 rpm. Resulting pH was 2.6; 1N NaOH (about 2.5 g) was added to bring pH to 4.8. Sample was placed in a sterile container. Batch weight was 500 g.
3J49-2: Protonated montmorillonite (2.5% solids) was diluted in half with 0.2 micron filtered water. Methylparaben and propylparaben were added at 0.2 wt % and 0.02 wt % respectively using silverson homogenizer at about 2000 rpm. When dissolved, Diutan gum at 20 wt % was added slowly under mild agitation at 3000 rpm. Resulting pH was 2.5; 98% Triethanolamine was added to bring pH to 4.8. Sample was placed in a sterile container. Batch weight was 500 g.
3J49-3: Protonated montmorillonite (2.6% solids) was diluted in half with 0.2 micron filtered water. Methylparaben and propylparaben were added at 0.2 wt % and 0.02 wt % respectively using silverson homogenizer at about 2000 rpm. When dissolved, Carbopol Ultrez-10 at 0.3 wt % was added slowly under gentle agitation at 1000 rpm. Resulting pH was 2.6; 1N NaOH (about 2.5 g) was added to bring pH to 4.8. Sample was placed in a sterile container. Batch weight was 500 g.
3J49-PL: Methylparaben and propylparaben were added to 0.2 micron filtered water at 0.2 wt % and 0.02 wt % respectively using silverson homogenizer at about 2000 rpm. When dissolved, Carbopol Ultrez-10 at 0.3 wt % was added slowly under gentle agitation at 1000 rpm. 1N NaOH was added to bring pH to 4.8. Sample was placed in a sterile container. Batch weight was 500 g.
Method: 72 female, outbred Hartley guinea pigs (300-350 g) were swabbed vaginally (to rupture the vaginal closure membrane) and 100 μl of compound (12 animals per compound; 6 compounds: PBS, 3J49-PL, 3J49-1, 3J49-2, 3J49-3, and PRO 2000 (a naphthalene sulphonate derivative with anti-HSV activity in mice) was applied intravaginally. Five minutes after treatment 1×106 pfu of HSV-1 strain 17syn+ was instilled into the vaginal vault. Vaginal swabs were collected 2 days after inoculation (when viral replication peaks) and the presence of infectious particles determined in culture. Animals were monitored for acute disease for 14 days.
Results: Virucides typically protect against infection and thereby impact subsequent disease. Therefore, the primary outcomes are protection from infection (judged by evaluation of vaginal swabs for virus induced cytopathic effect in culture) and disease (judged by the presence or absence of herpetic lesions on the perineum). That data is summarized in Table 1 below.
As in humans, periodically even untreated animals are infected but remain asymptomatic. This occurred with 1 animal of 12 in the PBS group. Both the formulation control (3J49-PL) and 3J49-2 protected 6/12 animals from disease. While the other 2 formulations both protected 3/12 animals from disease symptoms. There is substantial protection in the formulation control and 3J49-2 treatment groups. However, there is no significant difference in the presence of disease symptoms between groups.
Disease Severity: Most studies of prophylactic treatment (i.e. virucides/microbicides) focus protection from infection and the development of any disease symptoms as the ideal treatment will protect from the development of any disease symptoms. The perineum of each animal was monitored daily and scored for disease severity ranging from a score 0 for no detectable lesions to 4.0 for 100% coverage of the perineum. See
Of the 6 treatment groups, 4 had animals that had to be removed prematurely due to disease severity (paralysis). Those prematurely removed correspond to 2 from 3149-PL, 1 from 3549-1, 1 from 3J49-3, and 2 from PRO 2000. Nonetheless, there is a strong trend toward reduced disease severity in animals treated with 3J49-2 (p<0.05 compared to PBS by one way Anova with a Dunnett's post-test). It may be that altering the timing, concentration and/or formulation of 3J49-2 would result in a significantly more efficacious virucide/anti-herpetic.
While PRO 2000 is the gold standard for anti-herpetic topical treatments in mice, it is not as efficacious in guinea pigs (Bourne and Bernstein, unpublished results) and did not provide significant protection in this experiment. In contrast, animals that received treatment with either the layered phyllosilicate material or the formulation control demonstrated reduced disease severity. Thus, the use of a layered phyllosilicate material as described herein for the treatment of a viral infection in vivo is specifically contemplated.
Preparation of Compound A: Smectite clay comprising about 80% sodium and about 20% calcium/magnesium as exchangeable ions was processed to a particle size of approximately 74 μm and purified via the process described in U.S. Pat. No. 6,050,509. After purification, the smectite clay comprised predominantly sodium ions.
The purified sodium exchanged clay was dispersed into filtered DI water to make a 3 wt % clay slurry. The mixture was mixed thoroughly with a Silverson homogenizer. The pH value of the starting clay slurry was about 10. An hydrogen ion exchange resin, Amberlite FPC23 H available from Rohm & Hass, was packed into two glass columns with a 2-in diameter and a 20-in length; one inch of space was left at the top of each column to promote flowability of the beads. The clay slurry was slowly mixed using a 3-inch dispersion blade at 800 rpm while a liquid pump was used to pump the clay slurry through two resin packed columns at 20 ml/min. The pH of the clay slurry was 2.3 after passing through the second column. The clay was then gamma irradiated to prevent bacterial contamination. The resulting hydrogen protonated smectite clay was designated as Compound A.
Preparation of Compound B: Smectite clay comprising about 5% sodium and about 95% calcium/magnesium as exchangeable ions was processed to a particle size of approximately 74 μm and purified via the process described in U.S. Pat. No. 6,050,509. After purification, the smectite clay comprised predominantly sodium ions.
The purified sodium exchanged clay was dispersed into filtered DI water to make a 2.7 wt % clay slurry. The mixture was mixed thoroughly with a Silverson homogenizer. The pH value of the starting clay slurry was about 10. An hydrogen ion exchange resin, Amberlite FPC23 H (Rohm & Hass) was packed into two glass columns with a 2-in diameter and a 20-in length; one inch of space was left at the top of each column to promote flowability of the beads. The clay slurry was slowly mixed using a 3-inch dispersion blade at 800 rpm while a liquid pump was used to pump the clay slurry through two resin packed columns at 20 ml/min. The clay was then gamma irradiated to prevent bacterial contamination. The resulting clay was designated as Compound B.
Preparation of Compound C: A smectite clay comprising about 70% sodium and about 30% calcium/magnesium as exchangeable ions was processed to a particle size of approximately 74 μm and purified via the process described in U.S. Pat. No. 6,050,509. After purification, the smectite clay comprised predominantly sodium ions.
The purified sodium exchanged clay was dispersed into filtered DI water to make a 2.6 wt % clay slurry. The mixture was mixed thoroughly with a Silverson homogenizer. The pH value of the starting clay slurry was about 10. An hydrogen ion exchange resin, Amberlite FPC23 H (Rohm & Hass) was packed into two glass columns with a 2-in diameter and a 20-in length; one inch of space was left at the top of each column to promote flowability of the beads. The clay slurry was slowly mixed using a 3-inch dispersion blade at 800 rpm while a liquid pump was used to pump the clay slurry through two resin packed columns at 20 ml/min. The clay was then gamma irradiated to prevent bacterial contamination. The resulting clay was designated as Compound C.
Preparation of Compound D: A calculated amount of smectite clay comprising about 80% sodium and about 20% calcium/magnesium was added into a 32 ppm (0.0032 wt %) AgNO3 solution. The slurry was mixed using a dispersion blade at 800 rpm for 10 minutes. The resulting paste-like material was designated as Compound D.
Preparation of Compound E: A calculated amount of smectite clay comprising about 80% sodium and about 20% calcium/magnesium was added into a 40 wt % benzalkonium chloride aqueous solution. The slurry was mixed using a dispersion blade at 800 rpm for 10 minutes. The slurry was then filtered through a fine filter paper. The filtered solid material was dried at 110° C. and ground to 200 mesh powder. The resulting powder was designated as Compound E.
The following Example describes the effects of Compounds A-E on various bacteria and fungi in vitro.
Briefly, cell suspensions of the challenge organisms were inoculated into the test samples at a level of 0.1 mL per 25 g aliquots of product at initial challenge and a level of 0.1 mL per 23 g at rechallenge. Challenge organisms were inoculated individually for Staphyllococcus aureus, Candida albicans and Aspergillus niger. Escherichia coli and Enterobacter cloacae as well as Pseudomonas aeruginosa and Burkholderis cepacia were tested as mixed inoculums.
The testing procedure, neutralizing procedure and the baseline are based on the “Determination of Preservation Adequacy of Water-Miscible Cosmetic and Toiletry Formulations, M-1 and M-3,” CTFA Microbiology Guidelines, November (2001), the disclosure of which is incorporated herein by reference in its entirety. If a material meets the reduction criteria for the bacteria, yeast and mold according to the acceptance criteria outlined in the above CTFA Microbiology Guidelines, the material is identified as an effective anti-bacterial and anti-fungal material. Tables 3 and 4 below demonstrate typical test results for an effective anti-bacterial and anti-fungal agent.
S. aureus
E. cloacae/
E. coli
B. cepacia/
P. aeruginosa
C. albicans
A. niger
S. aureus
E. cloacae/
E. coli
B. cepacia/
P. aeruginosa
C. albicans
A. niger
Compounds A-E were tested as described above and the results are set forth in Table 3 below.
S. aureus
E. cloacae/
E. coli
B. cepacia/
P. aeruginosa
C. albicans
A. niger
The log reduction numbers for Compound E is lower than the other test compounds because the Compound E samples had a 1000 CFU/g detection limit compared to 10 CFU/g for Compounds A-D.
The results in Table 3 indicate that all of Compounds A-E demonstrated effective antibacterial properties under the test conditions. Compounds D-E also exhibited effective anti-fungal properties under the test conditions.
This application is a continuation-in-part of U.S. patent application Ser. No. 11/959,021, filed Dec. 18, 2007, which is a continuation-in-part of U.S. patent application Ser. No. 11/196,090, filed Aug. 3, 2005. U.S. patant application Ser. No. 11/959,021, filed Dec. 18, 2007, also claims the benefit of priority of U.S. Patent Application No. 60/966,538, filed Dec. 18, 2006 and U.S. Patent Application No. 60/966,537, filed Dec. 18, 2006. The disclosure of all priority applications is incorporated herein by reference in their entireties.
| Number | Date | Country | |
|---|---|---|---|
| 60966538 | Dec 2006 | US | |
| 60966537 | Dec 2006 | US |
| Number | Date | Country | |
|---|---|---|---|
| Parent | 11959021 | Dec 2007 | US |
| Child | 12274772 | US | |
| Parent | 11196090 | Aug 2005 | US |
| Child | 11959021 | US |
