Patent Application
20170172145
The present disclosure relates to compositions containing an amide, products incorporating the compositions, and methods of using the compositions and products.
The past decade has ushered an era of unprecedented advances in aqueous antimicrobial chemistry. Much effort has been directed at supplementing the antimicrobial activity of compositions comprising a combination of surfactant, organic acid, and either a North American registered active or a notified active recognized by the European Biocidal Products Regulation. At the same time, increased environmental awareness has created new demand for compositions based on renewable actives. The net result has been a proliferation of commercially available antimicrobial products based on organic acids, essential oils, silver compounds, and hydrogen peroxide that promise increasing cidal speed and broad spectrum activity. Given the limited number of government-accepted antimicrobial actives, advances have required the identification of safe, non-active raw materials, which, when combined with known antimicrobials, result in potentiation of antimicrobial activity.
Saturated and unsaturated, linear, branched, and cyclic amides are known in the art, and processes for making these amides are known. Cleaning compositions comprising an anionic surfactant salt, a saturated C8 to C10 alkyl amide solvent, a cosolvent, and water, where the compositions are substantially free of d-limonene and have a pH of between about 6.5 and about 10, are known. Aqueous hard surface cleaners comprising water, a monounsaturated C8-C14 fatty N,N-dialkylamide, and at least one anionic, cationic, nonionic, or amphoteric surfactant.
Compositions comprising a mixture of 2-(thiocyanomethylthio)benzothiazole and methylene-bis(thiocyanate) with dimethylamide of a carboxylic acid, which are synergistically effective compared to the respective components alone in controlling the growth of microorganisms, are known. Antimicrobial compositions comprising ionic silver, hydrogen peroxide, or a mixture thereof are also known. For example, aqueous disinfectants formulated by electrolytically generating silver ions in water in combination with a citric acid are known. Sterilizing and virus-removing actives containing hydrogen peroxide, benzyl alcohol and a silver component are known. Acidic aqueous disinfecting solutions comprising hydrogen peroxide, an anionic surfactant, and benzyl alcohol are known. Also, a disinfectant composition including a peroxide, a peracid, an anionic surfactant, a nonionic polymer, one or both of a linear fatty alcohol and an alkyl pyrrolidone is known.
There remains a need for a composition that provides improved cleaning as well as antimicrobial benefits, while comprising an increased content of raw materials derived from renewable sources. It is not known to include one or more amides in a composition to potentiate antimicrobial activity. It has now surprisingly been found that amides (which may be derived from renewable sources) may be incorporated into phase stable aqueous solutions to provide cleaning and potentiation of antimicrobial activity.
The present disclosure attempts to solve one or more of the needs above by providing an composition comprising a surfactant; an acidifying agent; an amide of formula I:
R1—CO—NR2R3 (I)
where R1 is selected from the group consisting of linear or branched, substituted or unsubstituted C6-C12 hydrocarbyl groups, each of R2 and R3 is independently selected from the group consisting of H, OH, a halogen group, and linear or branched, substituted or unsubstituted C1-C6 hydrocarbyl groups; and water; where the composition has a pH from about 1.0 to about 6.0.
Features and benefits of the disclosed invention will become apparent from the following description, which includes examples intended to give a broad representation of the invention. Various modifications will be apparent to those skilled in the art from this description and from practice of the invention. The scope is not intended to be limited to the particular forms disclosed and the invention covers all modifications, equivalents, and alternatives falling within the spirit and scope of the invention as defined by the claims.
As used herein, the articles including “the,” “a” and “an” when used in a claim or in the specification, are understood to mean one or more of what is claimed or described.
As used herein, the terms “include,” “includes” and “including” are meant to be non-limiting.
As used herein, the terms “active” and “agent” are used interchangeably.
As used herein, the term “renewable” (as in “renewable feedstock”) refers to materials (e.g., surfactant, solvent, acidifying agent) that are derived from a renewable feedstock and contain renewable carbon. The term “renewable” is used interchangeably with the terms “biobased” and “natural.” A renewable feedstock is a feedstock that is derived from a renewable resource, e.g., plants, and non-geologically derived. A material may be partially renewable (less than 100% renewable carbon content), 100% renewable (100% renewable carbon content), or somewhere in between (e.g., 50% renewable carbon content). A renewable material, for example a renewable ethanol, may be blended with a non-renewable material, for example, conventional ethanol, to yield a partially renewable material, e.g., partially renewable ethanol.
The terms “microorganism” or “microbe” as used herein are intended to include cellular organisms, both unicellular and multicellular that are less than 5 mm in length, and include but are not limited to bacteria, fungi, prions, enveloped and non-enveloped viruses, archaea, protists, protozoa or oocysts formed by protozoa, green algae, plankton, planarian, amoebas and yeasts, or spores formed by any of these. The terms “microorganism” or “microbe” include the single or planktonic microbes that may contaminate surfaces, as well as communities of microbes that grow as biofilms on surfaces.
The term “antimicrobial” as used herein refers to a compound that exhibits microbicide or microbiostatic properties that enables the compound to kill, destroy, inactivate, or neutralize a microorganism; or to mitigate, prevent, or reduce the growth, ability to survive, or propagation of a microorganism. In the context of antimicrobial, the term “treat” means to kill, destroy, inactivate, or neutralize a microorganism; or to prevent or reduce the growth, ability to survive, or propagation of a microorganism
The term “substantially free of” or “substantially free from” as used herein refers to either the complete absence of an ingredient or a minimal amount thereof merely as impurity or unintended byproduct of another ingredient. A composition that is “substantially free” of/from a component means that the composition comprises less than about 0.01%, or less than about 0.001%, or even 0%, by weight of the composition, of the component.
It should be understood that every maximum numerical limitation given throughout this specification includes every lower numerical limitation, as if such lower numerical limitations were expressly written herein. Every minimum numerical limitation given throughout this specification will include every higher numerical limitation, as if such higher numerical limitations were expressly written herein. Every numerical range given throughout this specification will include every narrower numerical range that falls within such broader numerical range, as if such narrower numerical ranges were all expressly written herein.
All cited patents and other documents are, in relevant part, incorporated by reference as if fully restated herein. The citation of any patent or other document is not an admission that the cited patent or other document is prior art with respect to the present invention.
In this description, all concentrations and ratios are on a weight basis of the composition unless otherwise specified.
Unless otherwise noted, all component or composition levels are in reference to the active portion of that component or composition, and are exclusive of impurities, for example, residual solvents or by-products, which may be present in commercially available sources of such components or compositions.
All measurements are performed at 25° C. unless otherwise specified.
The compositions of the present disclosure may be formulated as concentrates or ready-to-use compositions. The compositions of the present disclosure may deliver cleaning benefits on hard and soft surfaces. The compositions of the present disclosure may be antimicrobial compositions and deliver improved antimicrobial activity on hard and soft surfaces. The compositions of the present disclosure may deliver cleaning benefits as well as antimicrobial benefits on hard and soft surfaces. The compositions disclosed herein may also be made in whole or in part using raw materials derived from renewable feedstocks, such as plant oils.
Concentrates may be diluted with water in order to provide an in-use solution having a desired level of detersive properties or other properties, including antimicrobial properties. The antimicrobial properties desired may depend on the challenge posed by the target microorganism; for example, enveloped viruses are more susceptible to inactivation than non-enveloped viruses, and spore-forming organisms are very resistant to chemical inactivation. Each organism type presents a different challenge and may call for a different level of dilution (or none) in order to achieve the desired antimicrobial activity.
The water used to dilute the concentrate (water of dilution) can be available at the locale or site of dilution. The water of dilution may contain varying levels of hardness depending upon the locale. Service waters available from various municipalities have varying levels of hardness. It is desirable to provide a concentrate that can handle the hardness levels found in the service water of various municipalities. The water of dilution may have a hardness ranging from about zero to at least about 400 ppm hardness (as CaCO3).
Concentrated solutions may provide for improved economics to the manufacturer and to the user as they may comprise less water and may use less packaging material on a per-use basis, as compared to a ready-to-use composition. A concentrated composition may be diluted with water at a weight ratio of composition to water ranging from about 1:1.5 to about 1:1000, or from about 1:4 to about 1:250. The terms “in-use composition” or “in-use diluted composition” refer to concentrated compositions that have been diluted with water prior to use.
Alternatively, the compositions may be ready-to-use antimicrobial sprays, gels, creams, powders, soluble unit dose articles, pastes, or antimicrobial wet wipes. The compositions may also be comprised into foams, such as melamine-formaldehyde foams. For toilet hygiene, the compositions can be in the form of dissolvable rim-blocs which partially dissolve after the toilet is flushed. Ready to use compositions may provide more convenience to the user.
The compositions disclosed herein generally provide short-contact-time antimicrobial benefits, e.g., from about 10 seconds to about 3 minutes or from about 15 seconds to about 2 minutes, or from 30 seconds to about 1 minute, though longer contact times, e.g., from about 3 minutes to about 15 minutes, may also be achieved
Surfactant
The compositions of the present disclosure may comprise one or more surfactants. The surfactant may comprise from about 6 to about 12 carbon atoms, or from about 6 to about 11 carbon atoms, or from about 6 to about 10 carbon atoms, or from about 8 to about 10 carbon atoms. The surfactant may be branched or linear, saturated or unsaturated. The surfactant may be branched and comprise from about 6 to about 12 carbon atoms, or from about 6 to about 11 carbon atoms, or from about 6 to about 10 carbon atoms, or from about 8 to about 10 carbon atoms in the primary carbon chain, where “primary carbon chain” denotes the longest carbon-based chain that is uninterrupted by a heteroatom, such as O, S, N and P. For example, n-octyl sulfate has 8 carbon atoms in the primary carbon chain, 2-propyl-1-heptyl sulfate has 7 carbon atoms in the primary carbon chain, and dodecyl methyl ester sulfonate (C10H21—CH(SO3−)—C(O)O—CH3) has 11 carbon atoms in the primary carbon chain. In the context of branched surfactants, Cn (such as C1 or C8) refers to the number of carbon atoms in the primary carbon chain (for example, a 2-ethyl-1-hexyl primary carbon chain is C6). In the context of linear (or unbranched) surfactants, Cn (such as C1 or C8) refers to the total number of carbon atoms in the surfactant.
The surfactants may be substantially free of trace transition metal impurities (particularly for antimicrobial compositions comprising hydrogen peroxide). The surfactants may be substantially free of trace levels of chloride, bromide, and iodide (particularly for antimicrobial compositions comprising ionic silver).
The compositions may comprise from about 0.01% to about 60%, or from about 0.01% to about 40%, or from about 0.03% to about 35%, or from about 0.05% to about 30% of surfactant.
The concentrated compositions disclosed herein are generally intended to be diluted prior to use. A concentrated composition may comprise from about 0.5% to about 1%, or from about 1% to about 2%, or from about 2% to about 3%, or from about 3% to about 5%, or from about 5% to about 10%, or from about 10% to about 20%, or from about 20% to about 40%, of surfactant. A ready-to-use antimicrobial composition may comprise from about 0.01% to about 0.05%, or from 0.05% to about 0.10%, or from about 0.10% to about 0.15%, or from about 0.15% to about 0.25%, or from about 0.25% about 0.50% of surfactant. Ready-to-use antimicrobial compositions may comprise greater concentrations of surfactant, e.g., greater than about 0.50% (for example, for treatment of surfaces contaminated with mycobacteria, spore forming organisms, or biofilms).
Without being bound by theory, it is believed that the short chain-length of the surfactant—from about 6 to about 12 carbon atoms, or from about 6 to about 11 carbon atoms, or from about 6 to about 10 carbon atoms, or from about 8 to about 10 carbon atoms—is particularly beneficial for antimicrobial applications involving shorter contact times between the microorganism and the composition, for example, from about 10 seconds to about 3 minutes or from about 15 seconds to about 2 minutes, or from 30 seconds to about 1 minute. The short chain-length of the surfactant is believed to enhance the activity of antimicrobial active(s) in the composition. The short chain-length of the surfactant is also believed to help solubilize the (otherwise substantially water-insoluble) amide. Critical Micelle Concentration (CMC) measurements in the presence and absence of the amide indicate that the surfactants disclosed herein enhance the solubility of the amide by incorporating the amide into the micellar structure(s) of the surfactant. The CMC of the surfactant is significantly reduced, and this provides a reservoir of solubilized amide for antimicrobial potentiation activity. It is believed that the chain-length of the surfactant and the chain-length of the amide may be matched, for example, where the difference between the chain-length of the surfactant and the chain-length of the amide is about 2 to about 3 carbon atoms, to provide a combination of increased solubility of the amide in the composition and increased antimicrobial activity of the composition.
The compositions disclosed herein may comprise one or more C13-18 surfactants. For example, commercial surfactants are generally made up of a blend of molecules having different alkyl chain lengths (though it is possible to obtain single chain-length cuts), e.g., Polystep® B-25 (from the Stepan Company) is described as sodium decyl sulfate but also contains about 25%-30% dodecyl sulfate, by weight of the alkyl sulfate surfactant. Similarly, many commercial lauryl surfactants may include about 30% or more surfactant having chain-length(s) greater than C12. When C13-18 surfactant is present in the composition(s), the weight ratio of C6-12 surfactant to C13-18 surfactant may be greater than about 2:1, or greater than about 3:1. The average chain-length of the surfactant in the composition(s) may be less than about C12, or less than about C11. The surfactant in the composition may have an average chain-length of from about C7 to about C8, or from about C8 to about C9, or from about C9 to about C10, or from about C10 to about C11. The composition(s) may comprise surfactant having an average chain-length of about C8.
The solubility of the amide may be further increased by utilizing C13-18 surfactants. However, increased surfactant chain-length further reduces CMC, which means that a reduced concentration of both surfactant monomer and amide monomer is available for antimicrobial potentiation. Thus, there may be an optimal balance of shorter chain-length surfactant and longer chain-length surfactant, whereby the longer chain-length surfactant helps to solubilize the amide via formation of mixed micelles, and the shorter chain-length surfactant increases the CMC of the surfactant and the concentration of surfactant monomers and amide monomers that drive short-contact-time antimicrobial activity. The optimal balance may vary, depending on whether short-contact-time antimicrobial activity is desired. In other words, increased CMC values may be advantageous for faster activity, while reduced CMC values may be advantageous for longer-contact-time applications.
The antimicrobial compositions disclosed herein may comprise a surfactant comprising from about 6 to about 12 carbon atoms and an amide of formula I (comprising from about 6 to about 12 carbon atoms). The CMC of the composition may be from about 100 ppm to about 2,500 ppm, or from about 200 ppm to about 2,000 ppm, or from about 300 ppm to about 1,500 ppm.
The antimicrobial composition(s) disclosed herein may comprise surfactant selected from the group consisting of an anionic surfactant, a cationic surfactant, a nonionic surfactant, an amphoteric surfactant, a zwitterionic surfactant, and mixtures thereof.
Suitable anionic surfactants include the sodium, potassium, ammonium, alkanol-ammonium magnesium and calcium salts of C8-C10 glyceryl ether sulfonates, C8 alkyl sulfonates, C2-C8 linear alkyl benzene sulfonate, C6-C12 alkyl sulfates, C8-C12 alkyl ether sulfates, C5-10 alkyl and alkenyl succinates as mono or dianionic surfactants [e.g., R—CH(COO−M+)—CH2—COO−M+, R—CH(COO−M+)—CH2—COOH− and R—CH(COOH)—CH2—COO−M+ wherein R=C5-10 linear or branched alkyl or alkenyl group and M=lithium, sodium, potassium, ammonium or alkanol-ammonium, and mixtures thereof], C8-C12 methyl ester sulfonates, C8-C12 fatty acid sulfonates and C6-C12 carboxylates, and mixtures thereof. The surfactant may comprise an anionic surfactant selected from the group consisting of sodium octyl sulfate, sodium decyl sulfate, sodium octyl glyceryl ether sulfonate (C8H17—O—CH2—CH(OH)—CH2SO3Na), the sodium salt of 2-propyl-1-heptyl sulfate, the sodium salts of C9-11 secondary sulfates, the sodium salts of C12 methyl ester sulfonate and C12 fatty acid sulfonate, and mixtures thereof. The surfactant may comprise an anionic surfactant selected from the group consisting of octyl sulfate, sodium decyl sulfate, and mixtures thereof. The anionic surfactant may be derived from a renewable feedstock, for example, n-octyl alcohol or n-decyl alcohol derived from plant oils for the making of n-octyl sulfate and n-decyl sulfate, respectively, and n-dodecyl methyl ester derived from plant oils for the making of C12 methyl ester sulfonate and C12 fatty acid sulfonate.
Suitable nonionic surfactants include linear or branched, saturated or unsaturated alcohol alkoxylates, alkyl glycosides, and alkyl ethoxy carboxylic acids comprising from about 6 to about 12 carbon atoms in the primary chain. The surfactant may comprise a nonionic surfactant selected from the group consisting of C6-12 alcohol ethoxylate comprising an average of from about 1 mole to about 7 moles of ethylene oxide, C6-12 alcohol ethoxy propoxylate comprising an average of from about 1 mole to about 7 moles of ethylene oxide and from about 1 mole to about 4 moles of propylene oxide, C8 pyrrolidone, C8 and C8-10 alkyl polyglucoside with a degree of glucoside polymerization of from about 1 to about 1.6, C8-10 alkyl polypentoside (e.g., xyloside and riboside) with a degree of sugar pentoside polymerization of from about 1 to about 1.6, and C12 ethoxy carboxylic acid comprising an average of from about 1 mole to about 3 moles of ethylene oxide. The surfactant may comprise a nonionic surfactant selected from the group consisting of octyl alkylpolyglycoside, decyl alkylpolyglycoside, octyl pyrrolidone, and mixtures thereof. As in the case of the anionic surfactant, the nonionic surfactant may be derived from a renewable feedstock. For example, the C8 and C8-10 alkyl polyglycosides (hexosides and pentosides) may be made from entirely renewable feedstocks.
Suitable cationic surfactants include saturated or unsaturated betaines, amine oxides, alkyl morpholinium compounds and alkyl trimethyl ammonium compounds comprising from about 6 to about 12 carbon atoms. The surfactant may comprise a cationic surfactant selected from the group consisting of n-octyl dimethyl amine oxide, n-octyl dimethyl betaine, n-octyl amidopropyl betaine, and mixtures thereof. The cationic surfactant may be derived from a renewable feedstock.
Suitable zwitterionic surfactants include 2-ethyl-1-hexyl imino dipropionate as well as n-dodecyl imino dipropionate (mono- and dianionic salts), C6-12 amphoglycinates, and C6-12 alkyl sulfobetaines, such as the sodium salt of n-octyl, n-decyl, or n-dodecyl N,N-dimethyl-3-ammonio-1-propanesulfonate.
The antimicrobial composition(s) disclosed herein may comprise surfactant selected from the group consisting of C8 glyceryl ether sulfonate, C6-C12 alkyl sulfate, C8-C12 methyl ester sulfonate, C8-C12 fatty acid sulfonate, C6-C12 ether carboxylate, C8-10 amine dimethyl oxide, C8 pyrrolidone, C8 dimethyl betaine, C8-10 alkyl polyglycoside, C8-12 N,N-dimethyl-3-ammonio-1-propanesulfonate, and mixtures thereof. The antimicrobial composition(s) disclosed herein may comprise from about 0.05% to about 30% of surfactant, where the surfactant is selected from the group consisting of sodium octyl sulfate, sodium decyl sulfate, sodium octyl glyceryl ether sulfonate, sodium dodecyl methyl ester sulfonate, sodium dodecyl fatty acid sulfonate, octyl dimethyl amine oxide, octyl pyrrolidone, and mixtures thereof.
Acidifying Agent
The compositions disclosed herein may comprise acidifying agent. The acidifying agent may adjust the pH of the composition to the following range: from about 1.0 to about 6.0, or from about 1.0 to about 5.5, or from about 1.0 to about 5.0, or from about 2.5 to about 5.0. The acidifying agent may help stabilize the pH of the composition by providing buffering capacity. The acidifying agent may also sequester transition metals, including iron, copper, manganese and the like. The acidifying agent may be chosen to further enhance the antimicrobial activity of the composition. The acidifying agent may be a US EPA/Health Canada registered active or a European notified antimicrobial substance.
The acidifying agent may comprise an organic acid, an inorganic acid, or a mixture thereof. The acidifying agent may be substantially free of trace transition metal impurities. Suitable inorganic acids include phosphoric acid, sulfuric acid, urea-sulfuric acid, hydrochloric acid, sulfamic acid, methyl sulfuric acid, hypochlorous acid, sodium bisulfate, and the like. Suitable organic acids include polymeric acids comprising at least 3 carboxylic acid groups, C1-C11 organic acids comprising at least one carboxylic acid group, and organic acids that do not comprise carboxylic acid functional groups (such as imidazole derivatives or phenolic or polyphenolic compounds). Non-limiting examples of polymeric acids include polymers of acrylic acid, methacrylic acid, maleic acid, or itaconic acid or copolymers of acrylic acid, methacrylic acid, maleic acid, itaconic acid, or mixtures thereof. Polymeric acids may be homopolymers or copolymers having a molecular weight of about 500 g/mol or greater. The polymeric acid may have a molecular weight ranging from about 500 g/mol to about 1,000,000 g/mol, or from about 500 g/mol to about 100,000 g/mol, or from about 1,000 g/mol to about 20,000 g/mol. Copolymers may be random copolymers or block copolymers. In addition to monomer units comprising carboxylic acid groups, the copolymers may also include one or more other monomers, such as styrene, acrylic ester, acrylamide, olefin sulfonate, and olefin acetate.
Non-limiting examples of C1-C11 organic acids include formic acid, acetic acid, benzoic acid, malonic acid, citric acid, maleic acid, fumaric acid, succinic acid, lactic acid, malic acid, tartaric acid, gluconic acid, glutaric acid, adipic acid, 2-ethyl-1-hexanoic acid, heptanoic acid, octanoic acid, nonanoic acid, undecylenic acid, butane tetracarboxylic acid, and the like. The organic acid may be derived from a renewable, plant-based feedstock and produced using natural processes, such as fermentation; examples include bio-based acetic acid, bio-based citric acid, bio-based lactic acid and bio-based succinic acid, and the like. The organic acid may have food-use pedigree or be Generally Regarded As Safe (GRAS) or a food additive by the US Food & Drug Administration.
The composition(s) disclosed herein may comprise acidifying agent, where the acidifying agent is selected from the group consisting of formic acid, acetic acid, benzoic acid, malonic acid, citric acid, maleic acid, fumaric acid, hypochlorous acid, succinic acid, gluconic acid, glutaric acid, lactic acid, 2-ethyl-1-hexanoic acid, octanoic acid, nonanoic acid, peracetic acid, peroctanoic acid, undecylenic acid, and mixtures thereof, or the acidifying agent is selected from the group consisting of benzoic acid, citric acid, lactic acid succinic acid, maleic acid, succinic acid, octanoic acid, and mixtures thereof.
The compositions may comprise from about 0.01% to about 40%, or from about 0.03% to about 25%, or from about 0.05% to about 10% acidifying agent. A concentrated composition may comprise from about 0.5% to about 1%, or from about 1% to about 3%, or from about 3% to about 5%, or from about 5% to about 10%, or from about 10% to about 20%, or from about 20% to about 40% of acidifying agent. An increased concentration of acidifying agent increases the composition's reserve buffering capacity, which reduces pH fluctuation upon dilution. Partial neutralization of the acidifying agent to a pH value just below its pKa (e.g., 0.1 to 0.5 pH units below the acidifying agent's pKa) may also help to reduce pH fluctuation upon dilution. A concentrate may therefore be formulated at an increased pH, which may lead to an improved overall safety profile without compromising in-use (diluted) antimicrobial performance. A ready-to-use composition may comprise from about 0.01% to about 0.05%, or from about 0.05% to about 0.10%, or from about 0.10% to about 0.15%, or from about 0.15% to about 0.25%, or from about 0.25% to about 0.50% of acidifying agent. Ready-to-use compositions may comprise greater amounts of acidifying agent, e.g., greater than 0.50%, for example, to treat surfaces contaminated with mycobacteria, spore forming organisms, or biofilms.
Generally, an increased pH may improve the overall safety of the composition, enhance the compatibility of the composition with a larger variety of optional adjuncts, and increase the scope of applications for which the composition may be used. For compositions having pH 3.5 or greater, the acidifying agent may be selected from acidifying agents having pKa values greater than about 4.0; non-limiting examples of such acidifying agents include acetic acid (pKa=4.8), succinic acid (pKa 4.2), benzoic acid (pKa=4.2), trans-cinnmaic acid (pKa=4.4), p-coumaric acid (4-hydroxy cibnnamic acid, pKa=4.6), octanoic acid (pKa 4.9), undecylenic acid (pKa 5.0), heptanoic acid (pKa=5.1), nonanoic acid (pKa=5.2), imidazole (pKa=7.0), hypochlorous acid (pKa=7.0) and mixtures thereof. Diprotic acid salts, such as the monosodium salt of maleic acid (pKa2=6.1), and triprotic acid salts, such as the mono- and dibasic salts of citric acid (pKa2=4.5, pKa3=6.4), may also be used to adjust the pH of the composition to pH 4.0 and greater.
The weight ratio of surfactant to acidifying agent in the composition may be from about 50:1 to about 1:50, or from about 10:1 to about 1:10, or from about 5:1 to about 1:5, or from about 3:1 to about 1:3.
The acidifying agent may be chosen to potentiate or provide antimicrobial properties. The acidifying agent may be selected from the group consisting of benzoic acid, citric acid, succinic acid, glycolic acid, lactic acid, octanoic acid, hypochlorous acid, peroxyacetic acid, peroxyoctanoic acid, and mixtures thereof. Acids characterized by reduced water solubility, including succinic acid, benzoic acid, cinnamic acid and octanoic acid, may be especially beneficial.
Amide
The compositions disclosed herein may comprise an amide of formula I,
R1—CO—NR2R3 (I)
where R1 is selected from the group consisting of linear or branched, substituted or unsubstituted C6-C12, or C6-C10 hydrocarbyl groups, each of R2 and R3 is independently selected from H, OH, a halogen, or C1-C6 linear or branched, substituted or unsubstituted hydrocarbyl groups. The compositions disclosed herein may comprise from about 0.01%, or from about 0.03%, or from about 0.05% to about 15%, or to about 25%, or to about 40% by weight of an amide of formula I.
A concentrated composition may comprise from about 1% to about 40%, or from about 1% to about 25%, or from about 1% to about 15%, or from about 1% to about 8%, or from about 1% to about 5%, or from about 1% to about 3% by weight of an amide of formula I. A concentrated antimicrobial composition may comprise from about 3% to about 40%, or from about 3% to about 15%, from about 3% to about 8%, from about 3% to about 5% by weight of an amide of formula I. A concentrated antimicrobial composition may comprise from about 5% to about 40%, or from about 5% to about 15%, or from about 5% to about 8% by weight of an amide of formula I. A concentrated composition may comprise from about 8% to about 40%, or from about 8% to about 15% by weight of an amide of formula I. A concentrated composition may comprise from about 15% to about 40% by weight of an amide of formula I. A ready-to-use composition may comprise from about 0.01% to about 0.50%, or from about 0.01% to about 0.20%, or from about 0.01% to about 0.10%, or from about 0.01% to about 0.05% by weight of an amide of formula I. A ready-to-use composition may comprise from about 0.05% to about 0.50%, or from about 0.05% to about 0.20%, or from about 0.05% to about 0.10% by weight of an amide of formula I. A ready-to-use composition may comprise from about 0.10% to about 0.50%, or from about 0.10% to about 0.20% by weight of an amide of formula I. A ready-to-use composition may comprise from about 0.20% to about 0.50% by weight of an amide of formula I. Ready-to-use compositions may comprise greater than 0.50% by weight of an amide of formula I, for example, to treat surfaces contaminated with mycobacteria, spore forming organisms, or biofilms. The weight ratio of surfactant to amide of formula I may be from about 0.05:1 to about 10:1, or from about 0.1:1 to about 5:1, or from about 0.2:1 to about 5:1, or from about 0.25:1 to about 5:1.
The composition(s) disclosed herein may comprise surfactant, which comprises from about 6 to about 12 carbon atoms, and an amide of formula I, where the weight ratio of the surfactant to the amide of formula I is from about 0.25:1 to about 5:1.
Amides of formula I include monounsaturated amides, saturated amides, and hydroxamic acids. Non-limiting examples of amides of formula I include n-octanamide, N-hexyl-N-methyl decanamide, N,N-diethanol octanamide, N,N-dibutyl hexanamide, octanohydroxamic acid, and N,N-diethanol dodecanamide. The composition(s) disclosed herein may comprise amide of formula I, wherein the amide of formula I is selected from the group consisting of N,N-dimethyl octanamide, N,N-dimethyl decanamide, N,N-dimethyl 9-decenamide, N.N-dimethyl 7-octenamide, octanohydroxamic acid, and mixtures thereof. It is noted that C6-12 hydroxamic acids, such as octanohydroxamic, may also provide chelation. For example, octanohydroxamic acid is known to have transition metal chelation properties, especially with respect to iron cations. As such, octanohydroxamic acid may be used, as a chelator, in combination with another amide of formula I, to supplement the activity of other amide. Combinations of C6-12 hydroxamic acid or C6-10 hydroxamic acid and another amide of formula I may be beneficial in promoting enhanced antimicrobial activity. Commercially available amides of formula I include Genagen 4296®, an N,N-dimethyl decanamide available from Clariant, Steposol® MET 10U, a N,N-dimethyl 9-decenamide available from Stepan Company, Cola®Mid AL, a lauric acid N,N-diethanol amide available from Colonial Chemical, and octanohydroxamic acid available from TCI America. Additionally, Steposol® M-8-10 is a mixture comprising approximately 55-60% N,N-dimethyl octanamide and approximately 40-45% N,N-dimethyl decanamide, which is derived from coconut oil and available from the Stepan Company.
It is believed that the amides disclosed herein potentiate the activity of antimicrobial actives against a variety of microorganisms, including Gram-positive bacteria, Gram-negative bacteria, non-enveloped viruses, fungi, mycobacteria, and even spore-forming organisms, such as Clostridium difficile spores. These potentiating effects are surprising given that amides alone are not known to have strong antimicrobial activity. Without wishing to be bound by theory, it is believed that the lipophilic character of the amide contributes to these potentiating effects; the amide is believed to preferentially partition into the microorganism, versus remaining in its monomer form in the composition. This partitioning is believed to induce micelles in the composition to release more amide monomers, in order to re-establish thermodynamic equilibrium. The released amide monomers again preferentially partition into the microorganism and the whole series of events—where amide monomers are continuously created from micelles and are then used up against the target microorganism—may contribute to the rapid antimicrobial activity of the disclosed compositions. By quickly and continuously permeating though microorganism defenses, the amide compound may also potentiate the activity of antimicrobial actives that are present in the composition.
For example, a composition that comprises hydrogen peroxide, as an antimicrobial active, may exhibit enhanced Fenton chemistry, with iron or copper from the microorganism, and may generate increased concentrations of oxygen-based radicals, which may react with the amide to form peracids or other highly reactive oxygen species (particularly, but not necessarily, inside the microorganism). For a composition comprising ionic silver, as an antimicrobial active, the nitrogen atom of the amide may associate with ionic silver, via a Lewis acid-base interaction, and may help to transport the silver ion into a microorganism, where it may cause death via known mechanisms.
The amide(s) disclosed herein may hydrolyze, over time, to its corresponding fatty acid, due to the acidic pH of the composition, particularly at a pH ranging from about 1 to about 2.5, and/or at increased temperatures (e.g., above room temperature). The compositions disclosed herein may therefore comprise a mixture of amide and its corresponding fatty acid. The fatty acid formed via hydrolysis may also contribute to antimicrobial activity, especially for compositions comprising hydrogen peroxide. For compositions comprising the amide of formula I and hydrogen peroxide, peracids may be formed via the following reactions:
R1—C(O)N(R2)(R3)+H2O═R1C(O)OH+NH(R2)(R3); and
R—C(O)OH+H2O2═R—C(O)OOH+H2O.
As amide hydrolysis is catalyzed by acid, increasing the pH of the composition may reduce amide hydrolysis, thereby reducing the concentration of peracid.
The level of fatty acid formed by amide hydrolysis may optionally be adjusted by the addition of from about 0.1% to about 10% of a lower alcohol, a primary C1-C6 amine, a secondary C1-C6 amine, a C1-C6 alkanol amine, or a mixture thereof to the composition. Suitable lower alcohols include methanol, ethanol, propylene glycol, dipropylene glycol, diethyleneglycol, glycerol, diglycerol, polyglycerol, or C1 to C8 mono- or di-glycerol ethers. The compositions disclosed herein may further comprise an ester. The compositions disclosed herein may comprise a mixture of amide(s), fatty acid(s) (e.g., generated via hydrolysis of the amide), and ester(s). Esters typically have desirable odor profiles.
Water
The compositions disclosed herein may comprise water. The water may be of any hardness. The water may be de-ionized water, reverse-osmosis-treated water, distilled water, or soft water (typically, soft water does not exceed 40 ppm hardness (as CaCO3)). The water may be de-ionized and/or reverse osmosis treated and may comprise less than about 1 ppm transition metal ion, or less than about 100 ppb transition metal ion.
The compositions may comprise from about 15% to about 99.95%, or from about 20% to about 95%, or from about 20% to about 90%, or from about 25% to about 85% water by weight of the composition. The amount of water in a given composition depends on the degree to which the composition is concentrated. A super concentrate composition may comprise less than about 50%, or from about 15% to about 40%, or from about 20% to 35% of water by weight of the composition. Such super concentrates may provide improved economics on a per-use basis (e.g., following recommended dilution) for the user. Also, the water activity of a super concentrate may be sufficiently reduced, such that the composition does not freeze at temperatures as low as −3° C., or as low as −18° C. Super concentrates may also exhibit improved ambient-temperature (e.g., 20-23° C.) phase stability. Compositions comprising increased water content may also freeze more readily and exhibit phase instability upon thawing (e.g., crystallization or precipitation of one or more components). Super concentrate compositions may comprise surfactant, for example, a surfactant comprising from about 10 to about 12 carbon atoms; the surfactant may improve the ambient-temperature phase stability of the super concentrate compositions, upon dilution with water.
Ready-to-use compositions generally comprise greater water than concentrated compositions, which are intended to be diluted at the point of use. A ready-to-use composition may comprise from about 70% to about 99.9%, or from about 75% to about 99.5% water, or from about 80% to about 99% water by weight of the composition.
The composition(s) disclosed herein may comprise from about 0.01% to about 60%, or from about 0.01% to about 40% of surfactant, from about 0.01% to about 40% of acidifying agent, from about 0.01% to about 40% of amide of formula I, and from about 15% to about 99.95% of said water.
pH
The compositions disclosed herein may have pHs ranging from about 1.0 to about 6.0, or from about 1.0 to about 5.5, or from about 1.0 to about 5.0, or from about 2.5 to about 6.0, or from about 2.5 to about 5.5, or from about 2.5 to about 5.0, or from about 4.0 to about 5.5. For a concentrated composition that comprises less than about 70% water, the pH is measured after adding de-ionized water to the composition, until the total concentration of water in the composition is about 70%. For compositions that comprise greater than or equal to about 70% water, pH is measured on the composition as made (the composition is not diluted prior to measuring the pH).
The composition(s) disclosed herein may comprise surfactant; acidifying agent; amide of formula I:
R1—CO—NR2R3 (I)
where R1 is selected from the group consisting of linear or branched, substituted or unsubstituted C6-C12, or C6-C10 hydrocarbyl groups, each of R2 and R3 is independently selected from H, OH, a halogen, or C1-C6 linear or branched, substituted or unsubstituted hydrocarbyl groups; and water; where said composition has a pH from about 1.0 to about 6.0.
Antimicrobial Active
The compositions herein may comprise an antimicrobial active. The antimicrobial active is a material recognized by a governmental agency to provide antimicrobial activity. The antimicrobial active may be selected from the group consisting of benzoic acid, citric acid, glycolic acid, lactic acid, octanoic acid, nonanoic acid, decanoic acid, hypochlorous acid, hydrogen peroxide, peroxyacetic acid, peroxyoctanoic acid, ionic silver compounds, and mixtures thereof. The compositions disclosed herein may also optionally comprise from about 0.1% to about 10%, or from about 0.1% to about 5%, or from about 0.1% to about 1%, of a cationic antimicrobial agent. Suitable cationic antimicrobial agents for use in the compositions disclosed herein include benzalkonium chloride, benzethonium chloride, chlorhexidine diacetate, polyhexamethylene biguanide (PHMB), chlorhexidine digluconate, and mixtures thereof. The compositions may also comprise an antimicrobial agent selected from the group consisting of glutaraldehyde, zinc 2-pyridinethiol-1-oxide, copper sulfate pentahydrate, iodine, iodine salts, butoxypolypropoxypolyethoxyethanol iodine complex, polyvinylpyrrolidone-iodine complex, and mixtures thereof.
The antimicrobial active may be selected from the group consisting of ionic silver, an active oxygen source, such as hydrogen peroxide, and mixtures thereof.
As used herein, “ionic silver,” refers to any silver (I) compound that may be solubilized or dispersed in an aqueous medium at a pH ranging from about 1.0 to about 6.0. Examples of ionic silver include silver acetate, silver lactate, silver nitrate, silver dihydrogen citrate, silver sulfate, silver citrate, as well as complexes of silver I formed with ammonia. The composition may comprise from about 0.001%, or from about 0.002%, or from about 0.003%, or from about 0.005% to about 0.25%, or to about 0.3%, or to about 0.5%, or to about 2% of ionic silver by weight of the composition.
The concentration of ionic silver is calculated as the weight percent of silver present in an ionic silver compound. For example, the weight percent of ionic silver in a composition comprising 0.1% silver nitrate is 0.064% [0.1%*(107.9/169.9)] and the weight percent of silver in a composition comprising 0.1% silver dihydrogen citrate is 0.036% [0.1%*107.9/300.0]. The concentration of ionic silver in the composition depends on the desired concentration of the overall composition (e.g., concentrate versus ready-to-use) as well as the antimicrobial benefits sought. Compositions comprising ionic silver may be substantially free of chloride ion, iodide ion, and/or bromide ion impurities; the compositions may comprise less than about 10 ppm chloride ion, less than about 10 ppm iodide ion, less than about 10 ppm bromide ion, or less than about 10 ppm of a mixture thereof, or less than about 1 ppm chloride ion, less than about 1 ppm iodide ion, less than about 1 ppm bromide ion, or less than about 1 ppm of a mixture thereof.
The composition may comprise from about 0.01%, or from about 0.03%, or from about 0.05%, or from about 0.06%, or from about 0.07% to about 8%, or to about 10%, or to about 15%, or to about 20%, or to about 30% hydrogen peroxide. The composition may comprise from about 0.01%, or from about 0.03%, or from about 0.05%, or from about 0.06%, or from about 0.07% to about 8%, or to about 10%, or to about 15%, or to about 20%, or to about 30% of hydrogen peroxide by weight of the composition. The concentration of hydrogen peroxide in the composition depends on the desired concentration of the overall composition (e.g., concentrate versus ready-to-use) as well as on the antimicrobial benefits sought.
Compositions comprising hydrogen peroxide may comprise less than about 5 ppm transition metal ion impurities, or less than about 2 ppm transition metal ion impurities, or less than 0.5 ppm transition metal ion impurities. Compositions comprising hydrogen peroxide may comprise less than about 5 ppm ferrous ion, less than about 5 ppm ferric ion, or less than about 5 ppm of a mixture thereof, or less than about 1 ppm ferrous ion, less than about 1 ppm ferric ion, or less than about 1 ppm of a mixture thereof, or less than about 0.1 ppm ferrous ion, less than about 0.1 ppm ferric ion, or less than about 0.1 ppm of a mixture thereof.
For concentrates, the concentration of hydrogen peroxide may be from about 1% to about 30%, or from about 1% to about 15%, or from about 1% to about 8%, or from about 1% to about 5%, or from about 1% to about 3%, or from about 3% to about 30%, or from about 3% to about 15%, or from about 3% to about 8%, or from about 3% to about 5%, or from about 5% to about 30%, or from about 5% to about 15%, or from about 5% to about 8%, or from about 8% to about 30%, or from about 8% to about 15%, or from about 15% to about 30% by weight of the composition. For ready-to-use compositions or in-use diluted compositions, the concentration of hydrogen peroxide may be from about 0.02% to about 1%, or from about 0.02% to about 0.50%, or from about 0.02% to about 0.25%, or from about 0.02% to about 0.15%, or from about 0.02% to about 0.10%, or from about 0.02% to about 0.05%, or from 0.05% to about 1%, or from about 0.05% to about 0.50%, or from about 0.05% to about 0.25%, or from about 0.05% to about 0.15%, or from about 0.05% to about 0.10%, or from 0.10% to about 1%, or from about 0.10% to about 0.50%, or from about 0.10% to about 0.25%, or from about 0.10% to about 0.15%, or from about 0.15% to about 1%, or from about 0.15% to about 0.50%, or from about 0.15% to about 0.25%, or from about 0.25% to about 1%, or from about 0.25% to about 0.50%, or from about 0.50% to about 1% by weight of the composition. A ready-to-use composition may comprise a greater concentration of hydrogen peroxide, e.g., greater than about 1%, for example, for challenging antimicrobial benefits, such as the treatment of surfaces contaminated with mycobacteria, spore forming organisms, or biofilms.
The concentration of hydrogen peroxide may be from about 0.01% to about 8.0%. The weight ratio of hydrogen peroxide to acidifying agent is from about 0.1:1 to about 10:1, or from about 0.2:1 to about 5:1, or from about 0.5:1 to about 2:1. The composition(s) disclosed herein may comprise acidifying agent and an antimicrobial active, where the antimicrobial active comprises hydrogen peroxide, where the weight ratio of the acidifying agent to the hydrogen peroxide is from about 0.2:1 to about 5:1.
The composition(s) disclosed herein may comprise from about 0.05% to about 8% of antimicrobial active, where the antimicrobial active comprises hydrogen peroxide. The composition(s) disclosed herein may comprise from about 0.002% to about 0.5% of antimicrobial active, where the antimicrobial active comprises ionic silver. The composition(s) disclosed herein may comprise from about 0.002% to about 0.5% of antimicrobial active, where the antimicrobial active comprises ionic silver selected from the group consisting of silver nitrate, silver dihydrogen citrate, silver acetate, silver sulfate, and mixtures thereof. The composition(s) disclosed herein may comprise amide of formula I and antimicrobial active, where the antimicrobial active comprises hydrogen peroxide, and in the amide of formula I, R1 is selected from the group consisting of linear or branched, substituted or unsubstituted C6-C10 hydrocarbyl groups, wherein the weight ratio of hydrogen peroxide to the amide of formula I is from about 0.2:1 to about 5:1.
The combination of acid and hydrogen peroxide may generate measurable concentrations of peracid, from the reaction of acid and hydrogen peroxide.
The compositions disclosed herein may, however, comprise hydrogen peroxide and be substantially free of C6-12 peracids. The compositions disclosed herein may comprise catalytic amounts of peracid; in other words, the compositions disclosed herein may comprise from about 1 ppm to about 50 ppm, or about 1 ppm to about 10 ppm peracid, e.g., C6-12 peracid.
The compositions disclosed herein may comprise hydrogen peroxide and peracid, where the peracid is formed in-situ via the reaction of a carboxylic acid-containing acidifying agent and hydrogen peroxide. For example, when the composition comprises octanoic acid or nonanoic acid, as the acidifying agent, there may be peroxyoctanoic acid or peroxynonanoic acid, respectively, formed in-situ in the composition. The rate of formation of the peracid may depend on the pH of the composition (reduced pHs favor peracid formation and faster rates of formation). The compositions disclosed herein may comprise hydrogen peroxide and peracid, where the peracid is formed in-situ via the reaction of the fatty-acid-product of amide hydrolysis and hydrogen peroxide. Peracid species may have various benefits, including antimicrobial benefits.
The compositions may comprise C6-12 fatty acid, or C6-10 fatty acid, or C8 fatty acid (octanoic acid). The weight ratio of the fatty acid to the amide of formula I may be from about 0.01:1 to about 1:1, or from about 0.05:1 to about 0.5:1. The weight ratio of fatty acid to the corresponding peracid may be from about 5:1 to about 1000:1, or from about 10:1 to about 500:1, or from about 15:1 to about 100:1. The compositions may comprise a combination of C6-12 peracid and a short-chain peracid (e.g., peracetic acid and peroctanoic acid).
The composition(s) disclosed herein may comprise amide of formula I, antimicrobial active, where the antimicrobial active comprises hydrogen peroxide, and C6-10 fatty acid, where the weight ratio of the C6-10 fatty acid to the amide of formula I is from about 0.05:1 to about 0.5:1.
The composition may further comprise one or more esters of formic acid, acetic acid, benzoic acid, lactic acid, succinic acid, 3-hydroxybutyric acid and citric acid, such as isobutyl formate, butyl acetate, ethyl benzoate, ethyl lactate, butyl 3-hydroxybutyrate, or triethyl citrate. The compositions may further comprise peracid from the in-situ reaction of acidifying agent with hydrogen peroxide, or peracid formed by hydrolysis/perhydrolysis of amides and esters in the composition; alternatively, the compositions may be substantially free of peracid, especially peracid formed from amide precursors of formula I.
The concentration of in-situ generated C6-12 peracid in the composition may be from about 0 ppm, or from about 0.5 ppm, or from about 1 ppm, to about 10 ppm, or to about 15 ppm, or to about 25 ppm, or to about 50 ppm. Surprisingly, the disclosed combination of surfactant, acidifying agent, and hydrogen peroxide, either in the absence of in-situ generated C6-12 peracid or in combination with a low concentration of in-situ generated C6-12 peracid, provides bactericidal activity at short exposure times (e.g., 15 seconds to 2 minutes). This surprising effect is demonstrated in the examples (compositions #15 and #16). The composition(s) disclosed herein may comprise an antimicrobial active, where the antimicrobial active comprises hydrogen peroxide, and from 1 to about 50 ppm of C6-10 fatty peracid. The composition(s) disclosed herein may comprise an antimicrobial active, where the antimicrobial active comprises hydrogen peroxide, and from about 1 to about 25 ppm peroctanoic acid.
When the optional antimicrobial active is present, the weight ratio of the surfactant to the antimicrobial active may be from about 0.01:1 to about 300:1, or from about 0.1:1 to about 100:1, or from about 0.2:1 to 50:1. For compositions comprising ionic silver, as the optional antimicrobial active, the weight ratio of surfactant to ionic silver may be from about 1:1 to about 300:1, or from about 2:1 to about 200:1, or from about 4:1 to about 150:1, or from about 10:1 to about 100:1. For compositions comprising hydrogen peroxide, as the optional antimicrobial active, the weight ratio of surfactant to hydrogen peroxide may be from about 0.05:1 to about 20:1, or from about 0.1:1 to about 10:1, or from about 0.2:1 to about 5:1. For compositions comprising a combination of hydrogen peroxide and ionic silver, the weight ratio of hydrogen peroxide to ionic silver may be from about 5:1 to about 300:1, or from about 10:1 to about 250:1 or from about 20:1 to about 200:1. Weight ratios between components of the disclosed compositions may depend on a number of factors, including desired benefits and the optional adjuncts present in the composition.
The composition(s) disclosed herein may comprise surfactant and antimicrobial active, where the antimicrobial active comprises hydrogen peroxide and the surfactant comprises from about 6 to about 12 carbon atoms, and where the weight ratio of the surfactant to the hydrogen peroxide is from about 0.1:1 to about 10:1.
The compositions disclosed herein may comprise ionic silver, hydrogen peroxide, or mixtures thereof in combination with an unregistered (North America) or unnotified (Europe) acidifying agent. The compositions disclosed herein may comprise ionic silver, hydrogen peroxide, or mixtures thereof in combination with a registered (North America) or notified (Europe) acidifying agent. The compositions disclosed herein may comprise benzoic acid, citric acid, glycolic acid, hypochlorous acid, lactic acid, octanoic acid, peroxyacetic acid, hydrogen peroxide, ionic silver, or mixtures thereof (which are US EPA and Health Canada registered antimicrobial actives). Benzoic acid, citric acid, lactic acid, hydrogen peroxide, and certain ionic silver compounds, such as silver nitrate, are also approved for use for water treatment or on food contact surfaces in the USA. Additionally, citric acid, 1-lactic acid, ethanol, isopropanol, sodium bisulfate and hydrogen peroxide are the only antimicrobial approved actives for the US EPA's Design for the Environment (DfE) pesticide pilot project. Lactic acid, citric acid, peroxyoctanoic acid, and hydrogen peroxide are also notified substances in the European Union. These certifications may provide important credentialing options for the compositions disclosed herein.
The composition(s) disclosed herein may be a ready-to-use composition(s) comprising from about 0.05% to about 0.50% of surfactant; from about 0.05% to about 0.50% of acidifying agent; from about 0.10% to about 0.50% of antimicrobial active; from about 0.05% to about 0.50% of amide of Formula I. The composition(s) disclosed herein may be a ready-to-use composition(s) comprising from about 0.05% to about 0.50% of surfactant, where the surfactant comprises from about 6 to about 12 carbon atoms, or from about 6 to about 10 carbon atoms; from about 0.05% to about 0.50% of acidifying agent; from about 0.10% to about 0.50% of antimicrobial active, where the antimicrobial active comprises hydrogen peroxide; from about 0.05% to about 0.50% of amide of Formula I, where the amide of formula I is selected from the group consisting of N,N-dimethyl octanamide, N,N-dimethyl decanamide, N,N-dimethyl 9-decenamide, N.N-dimethyl 7-octenamide, octanohydroxamic acid, and mixtures thereof. The composition(s) disclosed herein may be a ready-to-use composition(s) comprising from about 0.05% to about 0.50% of surfactant, where the surfactant comprises about 6 to about 12 carbon atoms, or from about 6 to about 10 carbon atoms; from about 0.05% to about 0.50% of acidifying agent; from about 0.002% to about 0.1% of antimicrobial active, where the antimicrobial active comprises ionic silver; from about 0.05% to about 0.50% of amide of formula I, where the amide of formula I is selected from the group consisting of N,N-dimethyl octanamide, N,N-dimethyl decanamide, N,N-dimethyl 9-decenamide, N.N-dimethyl 7-octenamide, octanohydroxamic acid, and mixtures thereof.
The composition(s) disclosed herein may be a concentrated composition(s) comprising from about 0.5% to about 25%, or from about 1% to 10% of surfactant; from about 1% to about 20%, or from about 1% to about 10% of acidifying agent; from about 1% to about 30%, or from about 1% to about 8% of antimicrobial active; from about 1% to about 35%, or from about 1% to about 10% of amide of formula I; and from about 20% to about 95%, or from about 20% to about 90% water. The composition(s) disclosed herein may be a concentrated composition(s) comprising from about 0.5% to about 25%, or from about 1% to 10% of surfactant, wherein the surfactant comprises about 6 to about 10 carbon atoms; from about 1% to about 20%, or from about 1% to about 10% of acidifying agent; from about 1% to about 30%, or from about 1% to about 8% of antimicrobial active, wherein the antimicrobial active comprises hydrogen peroxide; from about 1% to about 35%, or from about 1% to about 10% of amide of formula I, where the amide of formula I is selected from the group consisting of N,N-dimethyl octanamide, N,N-dimethyl decanamide, N,N-dimethyl 9-decenamide, N.N-dimethyl 7-octenamide, octanohydroxamic acid, and mixtures thereof; and from about 20% to about 95%, or from about 20% to about 90% water.
The composition(s) disclosed herein may be a concentrated composition comprising from about 0.5% to about 25%, or from about 1% to about 10% of surfactant; from about 1% to about 20%, or from about 1% to about 10% of acidifying agent; from about 0.005% to about 0.5%, or from about 0.005% to about 0.05% of antimicrobial active; from about 1% to about 35%, or from about 1% to about 10% of amide of formula I; and from about 20% to about 95%, or from about 20% to about 90% water.
The composition(s) disclosed herein may be a concentrated composition comprising from about 0.5% to about 25%, or from about 1% to about 10% of surfactant, where the surfactant comprises from about 6 to about 10 carbon atoms; from about 1% to about 20%, or from about 1% to about 10% of acidifying agent; from about 0.005% to about 0.5%, or from about 0.005% to about 0.05% of antimicrobial active, where the antimicrobial active comprises ionic silver; from about 1% to about 35%, or from about 1% to about 10% of amide of formula I; and from about 20% to about 95%, or from about 20% to about 90% water.
Adjuncts
The compositions disclosed herein may also contain one or more adjuncts. Adjuncts may be employed to increase immediate and/or residual efficacy of the compositions, improve the wetting characteristics of the compositions upon application to a target substrate, operate as solvents for diluted compositions, and/or serve to modify the aesthetic characteristics of the composition. These adjuncts may also provide degreasing and solubilizing benefits, additional antimicrobial potentiation, thickening, soil agglomeration or soil release benefits, enhanced composition solubility, further catalysis of antimicrobial activity, residual or long-lasting (e.g., 24 hours) duration antimicrobial properties and/or enhanced surface safety benefits.
The composition(s) disclosed herein may comprise an adjunct selected from the group consisting of chelants, builders, buffers, abrasives, electrolytes, bleaching agents, fragrances, dyes, foaming control agents, corrosion inhibitors, essential oils, thickeners, pigments, gloss enhancers, enzymes, detergents, solvents, dispersants, polymers, silicones, hydrotropes, and mixtures thereof.
Solvents
The composition(s) disclosed herein may comprise a solvent (in addition to the amide of formula I, which may also function as a solvent). Solvents are generally liquid at ambient temperature conditions. Solvents may be desirable adjuncts especially for ready-to-use compositions and concentrated compositions, which are diluted with water at a ratio of about 1 part concentrate to less than about 10 parts water or about 1 part concentrate to less than about 5 parts water. The compositions disclosed herein may comprise from about 0.25% to about 25%, or from about 0.5% to about 15%, or from about 1% to about 10% of solvent by weight of the composition. Solvents may be used to control suds, adjust composition viscosity, or provide additional antimicrobial potentiation. Solvents may also be used to improve cleaning or prevent components of the composition from crystallizing out. Non-limiting examples of solvents that may improve cleaning include glycol ethers, more specifically C1-C8 derivatives of mono-, di-, and triethylene glycol ethers and diethers, and the C1-C6 derivatives of mono-, di- and tripropylene glycol ethers and diethers. Non-limiting examples include propylene glycol propyl ether, dipropylene glycol butyl ether, diethylene glycol butyl ether, tripropylene glycol dimethyl ether, ethylene glycol n-hexyl ether, ethylene glycol n-octyl ether, and the like. “Butyl” includes normal butyl, isobutyl and tertiary butyl groups. The solvent may be chosen to be non-VOC (Volatile Organic Compound), as defined by the California Air Resources Board, or VOC, e.g., ethanol, isopropanol and propylene glycol. A VOC solvent may be present at a concentration of less than about 0.5% by weight of the in-use composition.
The composition(s) disclosed herein may comprise a solvent selected from the group consisting of ethanol, isopropanol, C1-C8 monoethylene glycol ether, C1-C8 diethylene glycol ether, C1-C8 triethylene glycol ether, C1-C6 monopropylene glycol ether, C1-C6 dipropylene glycol ether, C1-C6 tripropylene glycol ether, C1-C6 esters of formic acid, C1-C6 esters of acetic acid, C1-C6 esters of benzoic acid, C1-C6 esters of lactic acid, C1-C6 esters of 3-hydroxybutyric acid, C1-C6 amines, C1-C6 alkanol amines, and mixtures thereof. Examples of commercially available ethylene glycol-based solvents include Hexyl Cellosolve™ (ethylene glycol n-hexyl ether, C6 monoethylene glycol) and Butyl Carbitol™ (diethylene glycol n-butyl ether, C4 diethylene glycol) sold by Dow Chemical Company. Examples of commercially available propylene glycol-based solvents include Dowanol DPnB™ (dipropylene glycol n-butyl ether, C4 dipropylene glycol) and Dowanol TPM™ (tripropylene glycol methyl ether, C1 tripropylene glycol), which are also available from the Dow Chemical Company.
The composition(s) disclosed herein may comprise from about 1% to about 10% of a solvent selected from the group consisting of glycerol, diethylene glycol monoethyl ether, butyl 3-hydroxybutyrate, and mixtures thereof. Incorporation of diethylene glycol monoethyl ether, a non-VOC compound, may help solubilize highly crystalline and substantially water-insoluble materials, such as benzoic acid (acidifying agent) and octanohydroxamic acid (amide of formula I). Incorporation of diethylene glycol monoethyl ether may also improve freeze-thaw stability of the composition, particularly for compositions comprising benzoic acid, and/or octanohydroxamic acid, which are substantially water-insoluble, highly crystalline materials that may precipitate out or crystallize out when a composition is cooled during the freeze process or warmed during the thaw process.
For composition(s) having a pH of about 2.5 or greater, or a pH of about 3.0 or greater, an ester-based solvent may improve cleaning. Non-limiting examples of ester-based solvents include C1-C6 esters of formic acid, C1-C6 esters of acetic acid, C1-C6 esters of lactic acid, C1-C6 esters of citric acid, C1-C6 esters of succinic acid, and C1-C6 esters of 3-hydroxybutyric acid. The composition may comprise butyl 3-hydroxybutyrate (Omnia™ solvent, available from Eastman), which may provide a boost in cleaning performance, especially for greasy soils. Butyl 3-hydroxybutyrate may also help solubilize highly crystalline and substantially water-insoluble materials and promotes the freeze-thaw stability of the composition (particularly a composition comprising benzoic acid and/or octanohydroxamic acid).
Ready-to-use compositions comprising benzoic acid, octanohydroxamic acid, or mixtures thereof, may comprise greater than about 0.5%, or greater than about 1%, by weight of the composition, of ester-based solvent, such as butyl 3-hydroxybutyrate. At such concentrations, butyl 3-hydroxybutyrate may mitigate or prevent crystallization. Concentrated compositions may comprise from about 3% to about 10% of ester-based solvent, such that upon dilution, the in-use level is at least about 0.5%, or at least about 1% by weight of the in-use composition.
Essential Oils
Suitable essential oils or actives thereof include those essential oils which exhibit antimicrobial activity. By “actives of essential oils” it is meant any ingredient of essential oils that exhibits antimicrobial activity. Essential oils and actives thereof may also provide a desirable odor profile.
Suitable essential oils include, but are not limited to, those obtained from thyme, lemongrass, citrus, lemons, oranges, anise, clove, aniseed, cinnamon, geranium, roses, mint, lavender, citronella, eucalyptus, peppermint, camphor, sandalwood, cedar, or mixtures thereof.
Actives of essential oils include, but are not limited to, thymol (present, for example, in thyme), eugenol (present, for example, in cinnamon and clove), menthol (present, for example, in mint), geraniol (present, for example, in geranium and rose), verbenone (present, for example, in vervain), eucalyptol and pinocarvone (present in eucalyptus), cedrol (present, for example, in cedar), anethol (present, for example, in anise), carvacrol, hinokitiol, berberine, terpineol, limonene, or mixtures thereof. The compositions disclosed herein may comprise thymol. Thymol is commercially available, for example, from Sigma Aldrich.
Chelants
The compositions disclosed herein may comprise one or more chelants or sequestrants. As used herein, the terms “chelant” and “sequestrant” are used interchangeably. Chelants include chemical compounds that sequester alkali earth metal divalent ions, transition metal divalent ions, and/or transition metal trivalent ions from solution. The metal ions to be sequestered may be present in the compositions disclosed herein (for example, incorporated via hard water used in a dilution) or may be embedded within the microorganism that the composition is intended to treat. Metal ions in the concentrated compositions disclosed herein may originate from impurities in the water or in the raw materials used to make the compositions. These metal ions may adversely affect performance or composition stability. The concentration of metal ions may be reduced using processes to purify water, including reverse osmosis and de-ionization. Examples of such metal ions include the divalent and trivalent ions of iron, nickel, manganese, and the like.
Metal ions associated with a microorganism may be important for the functioning and survival of microorganism. The metal ions may be extracellular or they may be intracellular; the metal ions may be present, for example, at the active site of metabolic or regulatory enzymes or as a cofactor that enables enzymatic activity. Examples of metal ions associated with a microorganism include iron, copper, zinc and magnesium ions, and the like.
Highly water-soluble chelants may be used to sequester metal ions present in the composition. Lipophilic chelants may be used to target the metal ions associated with a microorganism. The composition(s) disclosed herein may comprise a mixture of hydrophilic and lipophilic chelants.
The composition(s) disclosed herein may comprise up to about 10%, by weight of the composition, or from about 1% to about 10% of chelant. The chelant may comprise one or more phosphorus atoms. Non-limiting examples of phosphorous-containing chelants include 1-hydroxyethylidene-1,1-diphosphonic acid (HEDP, also known as etidronic acid), diethylene triamine penta(methylene phosphonic acid), 2-phosphonobutane-1,2,4-tricarboxylic acid (PBTC), and the like. The chelant may be a nil-phosphorus chelant. Non-limiting examples of nil-phosphorus chelants include the sodium, potassium, and alkanolamine salts of nitrilotriacetic acid (NTA), methyl glycine diacetic acid (MGDA), glutamic N.N-diacetic acid (GLDA), ethylene diamine tetraacetic acid (EDTA), diethylene triamine pentaacetic acid (DTPA), iminodisuccinic acid (IDS), ethylenediamine N,N′-disuccinic acid (EDDS), 4,5-dihydroxy-1,3-benzene disulfonic acid (Tiron), 2-hydroxypyridine N-oxide (HPNO), octyl isothiazolinone (OIT), picolinic acid, dipicolinic acid, 1-hydroxy-4-methyl-6-(2,4,4-trimethylpentyl) pyridine-2-one (piroctone acid), and the like. 2-hydroxypyridine N-oxide (HPNO) may be employed for chelation as well as for reducing precipitation or crystallization of crystalline components, such as benzoic acid or octanohydroxamic acid.
The composition(s) disclosed herein may comprise from about 1% to about 10% of a chelant selected from the group consisting of diethylene triamine pentaacetic acid (DTPA), iminodisuccinic acid, ethylenediamine N,N′-disuccinic acid, 4,5-dihydroxy-1,3-benzene disulfonic acid, octyl isothiazolinone, picolinic acid, dipicolinic acid, 2-hydroxypyridine N-oxide, and mixtures thereof.
The weight ratio of chelant to amide of formula I (when the amide is other than hydroxamic acid) may be from about 1:30 to about 1:3, or from about 1:20 to about 1:5. Incorporation of one or more chelants into the compositions disclosed herein may provide additional potentiation benefits, further supplementing the activity of the amide of formula I, particularly at greater composition pHs (e.g., pH about 3 to about 6 or pH about 4 to about 6).
Wipe or Pad
The present invention also relates to an article of manufacture comprising said composition, wherein the composition is comprised in a spray dispenser, or in a wipe or pad. The composition can be comprised on a wipe or pad. Such wipes and pads can be suitable for treating hard surfaces, such as found in the household, and the like. Suitable wipes can be fibrous. Suitable fibrous wipes can comprise polymeric fibres, cellulose fibres, and combinations thereof. Suitable cellulose-based wipes include kitchen wipes, and the like. Suitable polymeric fibres include polyethylene, polyester, and the like. Polymeric fibres can be spun-bonded to form the wipe. Methods for preparing thermally bonded fibrous materials are described in U.S. application Ser. No. 08/479,096 (Richards et al.), filed Jul. 3, 1995 (see especially pages 16-20) and U.S. Pat. No. 5,549,589 (Homey et al.), issued Aug. 27, 1996 (see especially Columns 9 to 10). Suitable pads include foams and the like, such as HIPE-derived hydrophilic, polymeric foam. Such foams and methods for their preparation are described in U.S. Pat. No. 5,550,167 (DesMarais), issued Aug. 27, 1996; and commonly assigned U.S. patent application Ser. No. 08/370,695 (Stone et al.), filed Jan. 10, 1995.
Methods of Use
The compositions disclosed herein may be used in a variety of applications and methods, including the treatment of hard surfaces, the treatment of soft inanimate surfaces, and the treatment of skin. The compositions may be used in the home to clean, sanitize, disinfect or sterilize hard surfaces, such as counters, sinks, restrooms, toilets, bath tubs, shower stalls, kitchen appliances, floors, windows, walls, furniture, phones, toys, drains, pipes, and the like. The compositions may also be used in commercial establishments, such as hotels, hospitals, care homes, eating establishments, fitness centers, schools, office buildings, department stores, and prisons, to clean, sanitize, disinfect, or sterilize equipment, tools, food and medical preparation areas (in addition to the surfaces mentioned above that are common to both homes and commercial establishments). The compositions disclosed herein may be used to treat indoor as well as outdoor surfaces and may also be used to sanitize, disinfect, or sterilize soft inanimate surfaces, such as carpets, area rugs, curtains, upholstery, and clothes, in both the home or in commercial settings.
The compositions may be used to treat bacteria, non-enveloped or enveloped viruses, fungi, spores, or allergens on surfaces or in the air. The compositions may also be used to purify contaminated water. The compositions may also be used in agricultural applications in the treatment of weeds, fruits, plants, and animals, including cattle and horses, as well as carcasses. The compositions may be used to disinfect or sanitize indoor or outdoor non-food, indirect food, or food contact agricultural premises, buildings, including animal housing, pens, feed troughs, greenhouses, storage containers and the like. The compositions may be used to sanitize or disinfect equipment used in non-food, indirect food, or food contact indoor and outdoor settings, including equipment used in green houses (with or without ornamental or food crops), feed handling, hatcheries, ice dispensing, processing livestock feeding, milk processing, milking, mushroom houses, poultry processing or handling, transport vehicles, and the like. The antimicrobial compositions, especially when formulated at a pH ranging from about 3.5 to about 6.0, may also be used to disinfect human skin.
Ready-to-use compositions may be housed in any container that allows for dispensing. Such containers may be metered to dispense a desired quantity or may include devices, such as caps, that allow the user to determine the level of dosing. Examples of containers include bottles, aerosols, pumps, and the like. Ready-to-use compositions may also be embedded in wipes or foams, such as melamine-formaldehyde foams. Such wipes may comprise woven and/or nonwoven substrates, where the substrates may include synthetic fibers, non-synthetic fibers, or mixtures of synthetic and non-synthetic fibers. As such, the wipe may optionally comprise cellulosic or non-cellulosic fibers, and, for high chemical resistance, may be in the form of a microfiber. The wipe may be a stand-alone or singly-formed substrate or a laminate of two or more substrates. Concentrates may be housed in any container as well. Concentrates may be dosed using mechanical or electrical pumps.
The present disclosure relates to an article of manufacture comprising the composition(s) disclosed herein in a spray dispenser or in a nonwoven substrate. The spray bottle may be a 2-chamber bottle in which, for example, the antimicrobial active is present in a first chamber and is separated from other formulation components present in the second chamber so as to mitigate or preclude reactivity of the antimicrobial active prior to use. Upon spraying, the contents of the 2 chambers are mixed together and sprayed as a uniform solution. The present disclosure also relates to a method of reducing the population of microorganism on a surface comprising the steps of applying an effective amount of the composition(s) disclosed herein to the surface and wiping the surface. The present disclosure also relates to a method of reducing population of microorganism on a surface comprising the steps of applying an effective amount of the composition(s) disclosed herein to the surface, where the composition contacts the surface for about 30 seconds to about 2 minutes, and wiping the surface.
The bactericidal and fungicidal activity of the compositions of the present disclosure is quantified by the Association of Official Analytical Chemists (AOAC) Germicidal Spray Test (GST) Official Method 961.02, Germicidal Spray Products as Disinfectants (Official Methods of Analysis of the AOAC, 2009 Edition). Briefly, the GST is a carrier based method used to evaluate disinfection efficacy of aerosol/pump-based spray products and volatile liquid products for registration with regulatory agencies such as the US EPA and Health Canada. In this method, a series of glass slides (“carriers”) are inoculated with a representative test organism and dried for 30 minutes (>4 log inoculation). The carriers contacting the dried organism film are then sequentially treated with the spray product until thoroughly wet and are exposed for a finite contact time. After exposure, the carriers are sequentially transferred to a liquid subculture medium specifically selected to neutralize the test substance antimicrobial active and to recover any surviving test organism. The carriers are incubated and visually examined for the presence or absence of growth. Results are recorded as: number of carriers showing growth÷number of carriers tested. For example, a test result with 4 carriers showing growth out of 60 carriers tested would be recorded as 4/60; it is understood that a lower number of carriers showing growth is suggestive of a stronger performance. As such, comparisons may be made to differentiate the cidal efficacy of different compositions at a given contact time. In examples below, the exposure (contact) time for each experiment or group of experiments is provided.
For purposes of illustrating the benefits provided by the compositions disclosed herein, a series of 60 carrier tests vs. Gram (+) Staphylococcus aureus, a series of 60 carriers test vs. Gram (−) Pseudomonas aeruginosa, and a series of 30 carriers tests vs. fungi Trichophyton mentagrophytes are run. The benefits associated with the amides of formula I are measured by comparing the performance of compositions with and without the amide, and, in some cases, comparing the performance of compositions comprising amide versus compositions comprising known additives.
The compositions below are made up by mixing the components together. The concentration of each component in a given composition corresponds to the weight of the component, provided on an active basis, as a percent of the weight of the composition. The order in which components are added may be important. For example, the antimicrobial active, when present, may be added last and may be added at ambient conditions near room temperature (e.g., 20-23° C.) to avoid unintentional chemical reactivity. The components may be added in the following order: de-ionized water, then surfactant, then acid(s). The composition may be heated to 50°-60° C. to accelerate dissolution of components, especially succinic acid. Once cooled back to room temperature, the amide and optional antimicrobial active may be added under constant agitation to ensure solution homogeneity. All compositions in the examples below are clear or translucent solutions as made. The compositions are housed in amber HDPE bottles to protect from the effects of light during storage. All antimicrobial testing is conducted within about 2 months of product making or less, e.g., within about 1 month of product making. All samples are stored at ambient conditions (20-23° C.) prior to testing.
Just prior to testing, the compositions are diluted in either de-ionized water or in 400 ppm hardness AOAC synthetic water expressed as CaCO3. The methodology is described in the Association of Official Analytical Chemists (AOAC), Official Method 960.09, Germicidal and Detergent Sanitizing Action of Disinfectants, Preparation of Synthetic Hard Water, in Official Methods of Analysis of the AOAC, 2005 Edition.
For the Germicidal Spray Test results, the following abbreviations are used:
SA=Staphylococcus aureus ATCC 6538
PA=Pseudomonas aeruginosa ATCC 15442
TM=Trichophyton mentagrophytes ATCC 9533
Dilutions are made on a volume basis. For example, a 1:30 dilution means that a ready-to-test solution is made by combining with 29 milliliters of water for each milliliter of the composition to be diluted, and a 1:50 dilution means that a ready-to-test solution is made by combining 49 milliliters of water for each milliliter of the composition to be diluted. DI H2O denotes de-ionized water. Hard water here denotes 400 ppm AOAC synthetic water expressed as CaCO3. Carrier results are reported as the number of carriers showing growth divided by the total number of carriers.
C8 AS: Sodium octyl sulfate, tradename Stepanol® C-8 sulfate from the Stepan Company, supplied as a 33% active solution in water.
C10 AS: Sodium decyl sulfate, tradename Polystep® B-25 from the Stepan Company, supplied as a 38% solution in water.
C12 AS: Sodium lauryl sulfate, tradename Stepanol® WA-Extra, supplied as a 30% solution in water.
DMA: dimethyl amide
Succ.: succinic acid; a bio-based succinic acid from the Succinity Corporation supplied as a >99.5% powder.
C6 DMA: N,N-dimethyl hexanamide available from Frinton Laboratories, Hainesport, N.J. as 98% active liquid
C8 DMA: N,N-dimethyl octanamide available from Adilab, West Newton, Mass. as a 95% active liquid
C8-10 DMA: N,N-dimethyl octanamide and N,N-dimethyl decanamide in about a 55:45 weight ratio, tradename Steposol® M-8-10 from the Stepan Company supplied as a near 100% active raw material.
C10 DMA: N,N-dimethyl decanamide, tradename Steposol® M-8-10 from the Stepan Company supplied as a near 100% active raw material.
C12 DMA: N,N-dimethyl dodecanamide (lauric acid, N—N-dimethyl amide) from Santa Cruz Biotechnology, supplied as a near 100% active raw material.
Unsat. C10 DMA: N,N-dimethyl-9-decenamide (monounsaturated amide), tradename Steposol® MET-10U form the Stepan company, supplied as a ≧97.0% active raw material.
Benzyl alcohol: Supplied by Lanxess Corporation as a ≧95% active raw material
Silver nitrate: Supplied by Sigma-Aldrich as a ≧99.0% active raw material
Hydrogen peroxide: Supplied by Sigma-Aldrich as a 30% solution in water or as a 35% active raw material, tradename Interox URM 35-D from Solvay Chemicals.
C8 glycerol ester: Capmul® 708G, a mixture of C8 mono glycerol ester (˜88%) and higher esters (˜12%); level of mono-dicaprylate ester ≧99%.
Butyl 3-Hydroxybutyrate: Omnia™ solvent, supplied by Eastman Chemical as a ≧98% active raw material,
Benzoic acid: Supplied by Sigma-Aldrich (ACS Reagent) as a ≧99.5% active crystalline powder raw material,
HPNO: 2-HydroxyPyridine N-oxide supplied by Sigma-Aldrich as a ≧96% active raw material C8 hydroxamic: Octanohydroxamic acid supplied by Tokyo Chemical Industry Ltd. as a ≧99.0% active raw material
NaOH: Sodium hydroxide, supplied as a 50% solution in water by Univar
Compositions #1-4 are made and tested to evaluate the effect of C8-10 N,N-dimethyl amide on the antimicrobial activity of acidic compositions comprising hydrogen peroxide. Germicidal spray test evaluations are performed in DI water and hard water conditions. Testing results are at 1-minute exposure time (SA=Staphylococcus aureus ATCC 6538, PA=Pseudomonas aeruginosa ATCC 15442, TM=Trichophyton mentagrophytes ATCC 9533).
Composition #1, which lacks the amide, shows 60 out of 60 carrier failures vs. Staphylococcus aureus at a 1:30 dilution and 30 out of 30 carrier failures at a 1:10 dilution vs. Trichophyton mentagrophytes in both DI water and hard water conditions. By contrast, composition #2 and composition #3 (of the current application) show no more than 6 out of 60 carrier failures at a 1:50 dilution and no carrier failures vs. Trichophyton mentagrophytes at a 1:10 dilution in either hard DI water or hard water conditions. This indicates that the amide provides potentiation to the cidal activity provided by hydrogen peroxide. Composition #4 which lacks the amide but includes a known additive, benzyl alcohol, shows significantly weaker results versus the results achieved by compositions #2 and #3.
Compositions #5-8 are made and tested to evaluate the effect of C8-10 N,N-dimethyl amide as compared to benzyl alcohol on the antimicrobial activity of acidic compositions comprising hydrogen peroxide. Germicidal spray test evaluations are performed in DI water and hard water conditions on Staphylococcus aureus. Compositions #5-8 contain succinic acid and a second organic acid, either lactic acid or glycolic acid. Testing results are at a 1-minute exposure time (SA=Staphylococcus aureus ATCC 6538).
Composition #7, which is composition #4 with the addition of lactic acid, and composition #8, which is composition #4 with the addition of glycolic acid, show improved GST results, as compared to composition #4, on Staphylococcus aureus at 1:30 dilution in DI water. However, composition #7 and composition #8 demonstrate weaker GST results than composition #5 and composition #6 (of the current application) for the remaining test conditions.
Compositions #9-12 are made and tested to evaluate the effect of different chain-length alkyl sulfates and different chain-length amides on the antimicrobial activity of acidic compositions comprising hydrogen peroxide. Testing results are at a 1-minute exposure time (SA=Staphylococcus aureus ATCC 6538, PA=Pseudomonas aeruginosa ATCC 15442, TM=Trichophyton mentagrophytes ATCC 9533).
Each of composition #9, composition #10, compositions #11, and composition #12 is effective on Staphylococcus aureus and Pseudomonas aeruginosa up to a 1:50 dilution. Composition #10 and composition #12, both of which contain C12 amide, are not effective on Trichophyton mentagrophytes. By comparison, composition #9 and composition #11, both of which contain C8-10 amide, are effective on Trichophyton mentagrophytes. Composition #10 and composition #12, both of which contain C12 amide, demonstrate weaker GST results than composition #2, which contains C8-10 amide, but still improved GST results as compared to composition #1, which lacks an amide.
Compositions #13-16 evaluate the effect of C8-10 N,N-dimethyl amide and C8 glycerol ester on the antimicrobial activity of acidic compositions comprising hydrogen peroxide, at pH 3.0 as compared to pH 4.0 and in combination with HPNO as compared to lacking HPNO. Testing results are at a 1-minute exposure time (SA=Staphylococcus aureus ATCC 6538, TM=Trichophyton mentagrophytes ATCC 9533).
Each of composition #13, composition #14, and composition #15 is effective on Staphylococcus aureus at a 1:50 dilution in DI water and in hard water. However, only composition #13 (pH 3.0) and #14 (pH 4.0 with HPNO) are effective on Trichophyton mentagrophytes in DI water and in hard water. Comparison of the results for composition #14 versus composition #15 illustrates the effect that HPNO chelant has at pH 4.0. If one compares the effect of composition #15 versus the effect of composition #16 shows the benefits of the amide of formula I versus glycerol ester, at pH 4.0; this is unexpected given that esters are considered to be more reactive than amides.
Composition #15 is also analyzed and does not show detectable levels of hydrolysis after 1 month storage at ambient temperature conditions. By contrast, analytical testing of composition #16 shows detectable levels of acid hydrolysis after 1 month storage at ambient conditions; composition #16 contains partially hydrolyzed fatty acid ester (about 10% fatty acid). Yet, composition #16 demonstrates weaker GST results than composition #15. These results indicate that, surprisingly, the presence or formation of C6-12 peracid in the composition(s) may not improve antimicrobial performance or that C6-12 peracid may be present in catalytic amounts, e.g., about 1 to about 10 ppm.
The compositions disclosed herein may be free of, substantially free of, or comprise low concentrations of C6-12 peracid, yet still provide improved antimicrobial activity—similar to or better than the antimicrobial activity of known peracid-comprising compositions. Importantly, by avoiding the generation of high concentrations of peracid, one may formulate effectively at increased pHs (e.g., pH of about 3.0 to about 6.0, or about 3.5 to about 6.0, or about 4 to about 5.5).
Compositions #17-20 are made and tested to evaluate the effect of C8-10 N,N-dimethyl amide on the antimicrobial activity of acidic compositions comprising silver nitrate. Testing results are at a 1-minute exposure time time (SA=Staphylococcus aureus ATCC 6538, PA=Pseudomonas aeruginosa ATCC 15442, TM=Trichophyton mentagrophytes ATCC 9533).
Composition #17, which lacks a dialkyl substituted amide, shows 60 out of 60 carrier failures versus Staphylococcus aureus at a 1:30 dilution and 30 out of 30 carrier failures at a 1:10 dilution versus Trichophyton mentagrophytes. Compositions #18, #19 and #20, each containing an amide of formula I, show improved results, as compared to Composition #17, versus Staphylococcus aureus and Trichophyton mentagrophytes.
Compositions #21-24 are made and tested to evaluate the effect of C8-10 N,N-dimethyl amide on the antimicrobial activity of acidic compositions comprising thymol. Germicidal spray test evaluations are performed versus Staphylococcus aureus (ATCC 6538) at a 1:30 dilution in de-ionized water using a 1 minute exposure time.
The results show that compositions containing an amide of formula I in combination with thymol and in the absence of ionic silver or hydrogen peroxide (composition #22 and composition #24), show improved antimicrobial results, as compared to composition #21 and composition #23, which contain thymol and no amide.
Composition #25, which lacks the amide of formula I, is not effective in the Germicidal Spray Test versus Staphylococcus aureus (ATCC 6538) at a 1:50 dilution. By contrast, composition #26, which includes 0.5% octanohydroxamic acid, passes the Germicidal Spray Test at a 1:50 dilution in DI and hard water conditions.
The effectiveness of compositions #2 and #27 is evaluated versus three non-enveloped viruses as follows:
Rhinovirus Type 14 (RV 14)—ATCC VR-284, Poliovirus Type 1 (PV1)—ATCC VR-1562 and Feline calicivirus (FCV)—ATCC VR-782. Composition performance is measured using the well known EPA Virucidal Hard-Surface Efficacy Test. Briefly, 8 glass petri dishes with marked areas of 4 square inches are inoculated with 0.4 ml of the challenge microorganism and dried for 30 minutes. Inoculated carriers are then sprayed until thoroughly wet, from a distance of 6 to 8 inches, with each of compositions #2 and #27, which are pre-diluted 1:20 in AOAC hard water (400 ppm CaCO3). The carriers include a 5% serum organic load and the exposure time is 1 minute at 20±2° C.
Compositions #2 and #27, diluted 1:20 in AOAC hard water, pass the Virucidal Hard-Surface Efficacy Test versus Rhinovirus Type 14, Poliovirus Type 1 and Feline calicivirus.
The effectiveness of compositions #2 and #27 is evaluated versus Mycobacterium bovis (BCG), using the well known AOAC Germicidal Spray Test Tuberculocidal methodology. Mycobacterium bovis (BCG) is obtained from Organon Teknica Corporation. A one inch square area of each carrier is inoculated with 0.01 ml of the challenge microorganism and dried for 30 minutes. The inoculum contains a 5% serum organic load. Compositions #2 and #25 are diluted 1:10 (1 part composition to 9 parts diluent) using 400 ppm AOAC hard water. Inoculated carriers are then sprayed until thoroughly wet. Following 2 minutes exposure, the carriers are then sequentially transferred to a liquid subculture medium specifically selected to neutralize the test substance antimicrobial active and to recover any surviving test organism. The carriers are then incubated for 90 days and visually (morphology) and analytically (stain test) examined for the presence or absence of growth. The results are expressed as: number of tubes showing growth/total number of tubes.
The effectiveness of compositions #2 and #27 is evaluated versus Clostridium difficile in spore form—ATCC 43598, using the well known Standard Quantitative Disk Carrier Test Method. The Clostridium difficile in spore form includes an organic soil load. A 10 μl film of bacterial spores is dried on the surface of a brushed stainless steel disk. The inoculated and dried disk is placed into a Quantitative Carrier Test (QCT) vial and 50 μl of composition #2 or composition #27 is then applied to cover the inoculated carrier. After a 10 minute exposure time, the carriers are neutralized and quantitatively assayed for survivors. Results are shown below:
Results show that compositions #2 and #25 are sporicidal at a 10 minute exposure time in the presence of organic soil.
Compositions #28-31 are made and tested to evaluate the effect of various short chain alkyl N,N-dimethyl amides on the antimicrobial activity of acidic compositions comprising cationic short chain amine oxide. Test results are obtained using a 1 minute exposure time (SA=Staphylococcus aureus ATCC 6538, TM=Trichophyton mentagrophytes ATCC 9533).
Results show that compositions comprising short chain cationic amine oxide and hydrogen peroxide do not provide strong antimicrobial results in the absence of amide compound, as compared to identical compositions that do comprise an alkyl amide compound. Best results are achieved with C6 dimethyl amide, followed by C8 dimethyl amide and finally C10 dimethyl amide.
Compositions #32-35 are made and tested to evaluate the effect of the C6 and C8 chain length N,N-dimethyl amides on the antimicrobial activity of acidic compositions comprising anionic short chain alkyl sulfate at pH 2.5 and pH 4.0. Test results are obtained using a 1 minute exposure time (SA=Staphylococcus aureus ATCC 6538, TM=Trichophyton mentagrophytes ATCC 9533).
Results show that compositions comprising short chain alkyl sulfate, hydrogen peroxide and C6 N.N-dimethyl amide or C8 N,N-dimethyl amide are fully effective vs. Staphylococcus aureus and Trichophyton mentagrophytes at pH ˜2.5 and pH ˜4.0 at the dilutions tested.
Compositions #36-38 are made and tested to illustrate the ability to tune antimicrobial potentiation achieved by the alkyl N,N-dimethyl amides of the invention by either raising or lowering the concentration of antimicrobial active Test results are obtained using a 1 minute exposure time (SA=Staphylococcus aureus ATCC 6538, TM=Trichophyton mentagrophytes ATCC 9533).
Results show that the biocidal effectiveness of compositions comprising short chain alkyl sulfate, and alkyl N.N-dimethyl amide can be extended to higher dilution by increasing the level of antimicrobial active. That is, the potentiation of the amide compounds is not reduced when the concentration of antimicrobial active is increased.
Compositions #39-40 are made and tested to illustrate the ability to incorporate solvents while still delivering complete cidal effectiveness. Additionally, composition #40 uses benzoic acid to further illustrate flexibility in the invention with respect to selection of organic acid. Test results are obtained using a 1 minute exposure time (SA=Staphylococcus aureus ATCC 6538, TM=Trichophyton mentagrophytes ATCC 9533).
Results show that the cidal effectiveness of compositions comprising short chain alkyl sulfate, and alkyl N.N-dimethyl amide can be achieved in the presence of solvent and with alternative organic acids to succinic acid.
The Critical Micelle Concentrations of the compositions shown below are measured at pH 2.5±0.2 and/or pH 4.0±0.2. The measurements are made using a Beckman-Coulter workstation model Biomek FX. Measurements are conducted on the complete compositions below and the results are for the complete compositions tested. All of the compositions tested are compositions of the present disclosure. Additionally, all of the compositions have Critical Micelle Concentrations between about 100 ppm and about 2,500 ppm, or between about 150 ppm and about 1,500 ppm. The CMC values are not materially affected by the presence of hydrogen peroxide or by the presence of HPNO chelant.
The CMC data indicate that the greatest driver for CMC is the chain-length of the amide-compositions containing longer-chain-length amides show significantly reduced CMC values. Another important driver of CMC is the chain-length of the surfactant.
The dimensions and values disclosed herein are not to be understood as being strictly limited to the exact numerical values recited. Instead, unless otherwise specified, each such dimension is intended to mean both the recited value and a functionally equivalent range surrounding that value. For example, a dimension disclosed as “40 mm” is intended to mean “about 40 mm.”
Every document cited herein, including any cross referenced or related patent or application and any patent application or patent to which this application claims priority or benefit thereof, is hereby incorporated herein by reference in its entirety unless expressly excluded or otherwise limited. The citation of any document is not an admission that it is prior art with respect to any invention disclosed or claimed herein or that it alone, or in any combination with any other reference or references, teaches, suggests or discloses any such invention. Further, to the extent that any meaning or definition of a term in this document conflicts with any meaning or definition of the same term in a document incorporated by reference, the meaning or definition assigned to that term in this document shall govern.
While particular embodiments of the present invention have been illustrated and described, it would be obvious to those skilled in the art that various other changes and modifications can be made without departing from the spirit and scope of the invention. It is therefore intended to cover in the appended claims all such changes and modifications that are within the scope of this invention.
| Number | Date | Country | |
|---|---|---|---|
| 62271029 | Dec 2015 | US |
