Patent Application
20160113984
The present invention relates to an oily extract of plants of Rubus species and uses thereof in medical and cosmetic fields. In more detail, the invention relates to the use of an oily extract of plants of Rubus species and the topical treatment of cutaneous and mucosal pathologies and skin lesions. The invention further concerns a method for obtaining such extract through extraction in oil at room temperature.
As is well known, many plant-extract based formulations are currently used for treating skin lesions of various extensions and natures, thanks to their dermoprotective action and cicatrisation, anti-inflammatory, antibacterial, anti-dehydrating and soothing properties. For example, propolis-based creams are currently commercialised since they are able to stimulate tissue regeneration in the event of wounds or sores and promote the absorption of vitamin C, which is important for the synthesis of collagen.
In 2005, Maha F. El Goweni et AL, 2005, demonstrated that quercetin bioflavonoid has both preventive and curative effects in the treatment of hypertrophic scars. Subsequently, thanks to the study performed by Ipek SUntar et AL., 2009, “Wound Healing Activity of Rubus Sanctus Schreber (Rosacee): Preclinical study in Animal models”, it was suggested how extracts obtained from aerial parts of plants belonging to the Rubus Sanctus species can lead to the healing of wounds. However, such extracts were obtained through extraction with a solvent (n-hexane, methanol, chloroform, ethyl acetate, etc.) which, as is well known, implies a series of problems both in terms of toxicity and cost. For example, the publications of Esra Sariburun et al. (Esra Sariburun et al., Journal of Food Science, vol. 75, no. 4, 2010, pages C328-335) and Siriwoharn et al. (Siriwoharn et al., Journal of Food Science, vol. 69, no. 4, 2004, pages 233-240) are known, which describe extraction processes of the Rubus species through the use of water/methanol hydroalcoholic solution or organic solvents such as chloroform or dichloromethane. The extracts obtained through the extraction methods mentioned above can therefore contain residuals of organic solvents that are harmful to health. Furthermore, it must be considered that the use of various solvents causes particular divisions of the components extractable from the plant based on the different affinity of each component to the solvent used. Therefore, the use of organic solvents or various organic solvents in sequence, for example, two or three organic solvents in sequence, could result in a final extract in which not all the active substances or the adjuvant substances of the phytocomplex are present.
Patent IT 0001265649 described an extraction process for Rubus in oil, said process being characterised by the use of a high temperature and the use of fresh buds. However, in the process conditions of the prior art, only a minimal negligible percentage of components of a polyphenolic nature was yielded to the solvent.
In light of the above, the need to be able to make use of a new method to overcome the drawbacks of known methods appears clear.
The solution according to the present invention, which aims to provide an oily extract of Rubus characterised by a high polyphenol content, suitable for the treatment of skin and mucosal lesions, falls within this context. Furthermore, a method was found for obtaining said extract characterised in that the extraction is a cold oil extraction starting from a dry plant sample.
The extract that forms the subject matter of the present invention allows notably more marked, effective and rapid beneficial therapeutic effects to be obtained in comparison with existing antibiotic and/or cortisone-based dermatological and cicatrisation therapies. In fact, said extract has marked astringent, antiphlogistic, antiseptic, haemostatic and soothing activity, which is difficult to encompass in a single solution traceable to products already existing on the market.
The action of the extract according to the present invention is manifested on the surfaces of the skin and mucosa through the formation of a protective cuticle, due to the precipitation and transformation of tissue proteins, against chemical, bacterial, mechanical and irritative agents in general. This leads to a reduction in the secretory processes with more intensive removal of water from the tissues the more said tissues are imbibited, as actually happens in inflammatory processes. In burns in particular, the extract according to the present invention soothes pain, prevents losses of serum and protects the wound from bacterial invasion.
The extract further promotes excellent tissue cicatrisation with complete restitution of the damaged tissues and the absence of scarring retraction, giving the newly formed tissue excellent elasticity. Due to these special characteristics, the subject matter of the present invention proposes an innovative solution in comparison with the products traditionally used in such pathologies.
Furthermore, unlike the Rubus extracts obtained through the use of organic solvents, the extract according to the present invention is obtained through the use of oil, in particular natural vegetable oil. The extraction process according to the present invention does not envisage the use of any organic solvents, either lipophilic or hydrophilic. Therefore, the extract according to the present invention does not contain solvent residuals that are harmful to health.
A further advantage of the extract according to the present invention is represented by the fact that the extract does not contain products of the degradation of the thermolabile components of the plant since the extraction process according to the present invention is conducted cold. In fact, the degradation of the active substances would lead to a loss or reduction of the anti-oxidising power of the extract.
Based on the analytical results reported in the examples of the present description, it can also be observed that the extract according to the present invention contains significant quantities of all the active polyphenolic components of the phytocomplex such as, for example, caffeic acid, quercetin, rhamnetin and Kaempferol.
Clinical evidence, lacking in controlled studies, shows that the clinical results obtained through the use of the extract according to the present invention cannot be correlated solely and exclusively to the quantity and/or type of antioxidant contained in the extract and deriving from the plant species subjected to extraction. The clinical results, lacking in controlled studies, could also be due to a series of synergies installed between the phytocomplex contained in the extract and the oil used for extraction as well as any further synergies with the rest of the components of the pharmaceutical form containing the extract.
Unlike the extraction process reported in Italian patent IT 0001265649 mentioned above, characterised by a high temperature and the use of fresh buds, the preparation method of the extract according to the invention, which uses dry drug and low temperatures, allows a very high concentration of the polyphenolic fraction to be obtained, rich in particular in flavones, flavonols and flavonoids, which certainly includes a series of substances with activities and potential in the dermatological field. As shown in example 2 of the present patent application, the content of polyphenols in the extract obtained according to the process of the present invention was compared with that obtained through the process described by Italian patent IT 0001265649. The phenolic component of the extract according to the present invention was much higher than that of the patent mentioned above wherein said phenolic component is almost non-existent to the extent that it was not detected by the analytical instrument used. Furthermore, it is possible that the extraction conditions used in the prior art are not able to extract all the active substances such as, for example, caffeic acid, rhamnetin, quercetin and kaempferol. In the extract according to the present invention it is possible to clearly detect the presence of significant and effective quantities of the polyphenolic complex comprising caffeic acid, rhamnetin, quercetin and Kaempferol. In particular, the extract according to the present invention contains Caffeic Acid at the concentration of at least 0.2% (w/w), Rhamnetin at the concentration of at least 0.3% (w/w), Quercetin at the concentration of at least 0.3% (w/w) and Kaempferol at the concentration of at least 0.2% (w/w).
Furthermore, it has been observed that, for the same content of extract, the preparation according to the present invention is more effective in comparison with the composition of the prior art described in Italian patent IT0001265649 for the treatment of skin and mucosal disorders or pathologies showing a more marked action promoting cutaneous regeneration and quicker healing.
Finally, comparative studies with creams available on the market and used for the same use as the extract according to the present invention show much greater efficacy of the extract according to the invention.
Hence, the specific object of the present invention is an oily extract of plants of Rubus species, said extract comprising the polyphenolic phytocomplex of said plants, wherein said polyphenolic phytocomplex comprises caffeic acid, rhamnetin, quercetin, kaempferol. In particular, the extract according to the present invention may contain Caffeic Acid at the concentration of at least 0.2% (w/w), Rhamnetin at the concentration of at least 0.3% (w/w), Quercetin at the concentration of at least 0.3% (w/w) and Kaempferol at the concentration of at least 0.2% (w/w), wherein said percentages are weight percentages of each compound with respect to the weight of the extract. In fact, the extract according to the present invention contains flavonoids such as rhamnetin, flavonols comprising quercetin, kaempferol, flavanonols, such as 3-hydroxyflavanones or 2,3-dihydroflavonols. The preparation process of the extract according to the present invention enables the phytocomplex of the plant to be extracted wherein the active ingredients are present without the need for intermediate processes that would reduce the synergies present in the phytocomplex itself and consequently in the finished pharmaceutical form. Preferably, the plants of the Rubus species are chosen from the group consisting of Rubus Ulmifolius, Rubus Idaeus, Rubus caesius, Rubus saxatillis, from the group Rubus Ulmifolius preferably Rubus ulmifolius frutticosus schott.
Furthermore, according to the invention, the oil is chosen from the group consisting of vegetable oils with a marked polyunsaturated fatty acid component chosen from the group consisting of almond, jojoba, sunflower, virgin olive and extra virgin olive oils, preferably virgin olive and extra virgin olive oils. Said vegetable oils are characterised by a marked polyunsaturated fatty acid component such as, for example, linolenic, gamma linolenic.
The present invention further relates to a pharmaceutical composition comprising or consisting of an oily extract of plants of Rubus, as defined above, as an active ingredient, along with one or more pharmaceutically acceptable excipients and/or coadjuvants. Preferably, the pharmaceutical composition according to the present invention is a pharmaceutical composition for topical use.
A further aspect of the present invention is a process for the preparation of an oily extract of plants of Rubus, said process being characterised in that the extraction takes place through the incubation in oil of dried parts of plants of the Rubus species at a temperature that varies from 18 to 32° C., preferably from 22 to 28° C., more preferably at 25° C. Any part of the plant can be used in the extraction, however, the leaves and buds are preferable, wherein the buds (young shoots) are preferred.
In particular, in said process the Rubus species are chosen from the group consisting of Rubus Ulmifolius, Rubus Idaeus, Rubus caesius, Rubus saxatillis, from the group Rubus Ulmifolius preferably Rubus ulmifolius frutticosus schott.
Preferably, in said process, the oil is chosen from the group consisting of vegetable oils with a marked polyunsaturated fatty acid component chosen from the group consisting of almond, jojoba, sunflower, virgin olive and extra virgin olive oils, preferably virgin olive and extra virgin olive oils. Said vegetable oils being characterised by a marked polyunsaturated fatty acid component such as, for example, linolenic, gamma linolenic.
Furthermore, according to the present invention, in the aforementioned process, the plants of the Rubus species are harvested in the spring-summer seasons.
A further aspect of the present invention is an extract or a pharmaceutical composition as previously defined for use in the treatment of skin or mucosal disorders or pathologies. The skin or mucosal disorders or pathologies include for example burns, grazes, abrasions, rhagades, varicose ulcers, radiodermatitis, bedsores, torpid sores, light haemorrhages, nose bleeds, traumatic wounds, erythrodermic states, eczema, chilblains, dyshidrosis, itching, diabetic itching, insect bites, herpetic and erythematous lesions, dermatitis, for example psoriasis, atopic dermatitis, dermatosis, acne rosacea and vulgaris, folliculitis and furunculosis, post-laser erythema, nappy rash and sunrash, mouth ulcers, Lichen Planus, preferably burns and as a coadjuvant in the alteration of surgical wounds.
The extract and the pharmaceutical composition according to the present invention may be used in the medical and veterinary field, i.e. for treating both humans and animals.
Said extract and/or said composition can be applied both directly to the injured part of the body to be treated, for some hours, once a day, or by occlusion with bandages, gauze and similar materials for 30-60 minutes, 2-3 times a day.
In a preferred embodiment, the pharmaceutical composition according to the present invention comprises the following ingredients in the quantities listed below: sodium benzoate (as a preserving antimicrobial agent) 1 g, butylated hydroxytoluene (BHT) (as a preserving antioxidising agent) 0.1 g, lanolin from 120 to 350 g, preferably from 200 to 300 g, even more preferably 250 g, wax from 50 to 150 g, preferably from 65 to 120, even more preferably 80 g, water from 75 to 350, preferably from 120 to 250, even more preferably 219 g, wherein the quantity of RUB oily extract is from 100 to 800, preferably from 200 to 500, more preferably 450 g.
The present invention further concerns a cosmetic composition comprising the extract as defined above. Furthermore, the present invention regards the use of the extract according to the invention and the cosmetic composition defined above as a skin cosmetic, for example, antiageing, antioxidising or against skin imperfections such as, for example, stains, scars, stretch marks and cellulite.
The present invention will now be described, for non-limiting illustrative purposes, according to its preferred embodiments, with particular reference to the figures of the attached drawings, wherein:
The present invention will now be described, for non-limiting illustrative purposes, with particular reference to some specific embodiments.
Drying
Buds of Rubus Ulmifolius are inserted into a ventilated stove at 40±5° C. for a minimum of 24 hours and a maximum of 48 hours, preferably 35 hours.
Extraction
(OLEO-RUB.ESS sample)(i.e. extract prepared using dry drug) 7.5 g (minimum 4-maximum 10 days) of Rubus Ulmifolius buds dried in the stove, are placed in 92.5 g (minimum 75 g-maximum 110 g) of refined olive oil (official pharmacopoeia). The drug remains in contact with the oil for 10 days (minimum 5-maximum 15 days) at room temperature, indicatively 25° C. (minimum 18° C.-maximum 32° C.). After the pre-established time, the sample is filtered and appropriately stored.
Quality Investigation OLEO-RUB.ESS
Treating the Sample:
10 grams of OLEO-RUB.ESS were initially weighed, to which 50 ml of Hexane were subsequently added. The sample was then placed on a magnetic stirrer for 10 minutes and then subjected to liquid-liquid extraction in a separating funnel performed three times with the addition of 20 ml of a Methanol:Water solution, 80:20. The extract was then taken dry to the rotavapor and rehydrated before injection in HPLC with 1 ml of methanol.
Fresh Drug—Dry Drug Comparison
To confirm how the drying process does not determine a reduction in the polyphenolic presence in the drug and consequently in the extract, the chromatograms obtained by screening the fresh drug and the dry drug are compared below. The sample of dry drug to be subjected to analysis was prepared following the same protocol used for the fresh drug, summarised below.
The sample was prepared by inserting 1 gram of dry drug (buds) in a glass column containing 10 ml of Methanol and subsequently subjected to grinding, operating at room temperature with Ultraturrax for 2-3 minutes. The contents of the column are then poured into a vacuum flask equipped with a ceramic Buchner and filter for vacuum filtration, then the filtrate is inserted into a glass round-bottomed flask and placed into the rotavapor in order to completely remove the solvent operating at temperatures of no greater than 30-35° C. The sample of drug that remains in the filter is subjected two more times to the same process and the resulting filtrate is added to the round-bottomed flask containing the previous fractions. Once the solvent has been completely removed, redissolving with 1 ml of Methanol and HPLC analysis is carried out. Instrument used: HPLC Shimadzu LC 2010, pump LC-10ADvp, Column: Waters Symmetry RP18-25 cm×4.6 millimetres diameter 5 micron. Duration of chromatographic run 35 minutes Room T, Mobile phase (A): Methanol:Water—90:10; (B) Water:Methanol—90:10.
As can be noted from the chromatograms shown in the figures, the drying process does not interfere with the presence of the polyphenolic component found in the fresh drug. On the contrary, many peaks are certainly more concentrated in chromatogram F (
Quality/Quantity Characterisation of OLEO-RUB.ESS
For the quality/quantity determination of the peaks identified in the OLEO-RUB.ESS sample, as shown in chromatogram B, the sample was subjected to 5 fractionations. Each fraction was then subjected to HPLC-MS investigation in order to qualitatively identify the component responsible for the peak, which, once identified, after preparing the respective standard solution and relevant calibration line, was also quantified. The analytical conditions used for the fractionated peaks are reported as follows:
For the mass:
The component qualitatively identified in peak 5 (Isoquercetin) (
Summary of components per 10 grams of OLEO-RUB.ESS:
Preparation Method
OLEO-RUB 1 Prototype
With respect to the product described in Italian patent IT0011265649, the following components have been replaced:
Lamb/sheep fat replaced with anhydrous lanolin (official pharmacopoeia); Extra virgin olive oil replaced with virgin olive oil (official pharmacopoeia); Bees' wax replaced with cera alba/white flakes (official pharmacopoeia); An aliquot of unsaponifiables of olive oil was also added (which represent the olive oil fraction richest in polyphenolic components) in order to enrich the refined olive oil (official pharmacopoeia) and bring it closer to the characteristics of the olive oil in the patent indicated above (extra virgin olive oil).
Quantity of components per 100 grams:
30-50 g preferably 40 g Extract in Olive Oil from the official pharmacopoeia of dried Rubus buds [OLEO-RUB.ESS];
15-35 g preferably 25 g Anhydrous Lanolin (official pharmacopoeia);
6-10 g preferably 8 g cera alba/white flakes (official pharmacopoeia);
3-5 g preferably 4.89 g Unsaponifiables of olive oil (official pharmacopoeia)
16-26 g preferably 21 g Sterile water;
0.005-0.015 g preferably 0.01 g antioxidant (e.g. BHT);
0.05-0.015 g preferably 0.1 g preservative (e.g. Sodium Benzoate).
Preparation:
OLEO-RUB1 Prototype
The appropriate quantities of lanolin and white wax are melted at about 70° C. and subsequently the extract (OLEO-RUB.ESS) and the unsaponifiables of olive oil are added. The preservative (Sodium Benzoate) and the antioxidant (BHT) are added to the fatty mass. The semi-processed product is then subjected to turbo emulsion initially operating at 2000 rpm through an emulsifying sieve (wide mesh) during this phase which lasts about 10 minutes the envisaged quantity of water is also added, first heated to about 70° C. in order to prevent instantaneous solidification of the molten mass. A slower process guarantees more efficient and stable incorporation of the water in the internal phase of the emulsion. After about 15 minutes the homogenisation through turbo emulsion continues at 3000/3500 rpm through the emulsifying sieve with narrow mesh and continues for about 30 minutes. At this stage the initially fluid mass begins to gain viscosity and the process continues for another 30 minutes reducing the speed of the turbo emulsifier (1500 rpm) and activating planetary agitation. Finally, after this stage, the formulation is left under planetary agitation only and when the mass reaches a temperature of about 37° C., hence before it has reached the final viscosity, it is poured into the container that is only sealed once solidification is complete, i.e. when the temperature settles around 27° C.
OLEO-RUB 2 Prototype
The process is the same as the previous one, OLEO-RUB 1, except that the fraction of unsaponifiables is replaced with olive oil (official pharmacopoeia).
Composition per 100 grams:
OLEO-RUB 3 Prototype
Unlike the previous formulations, in this prototype an emulsifying system has been used made up of Cetostearyl Alcohol and Cetomacrogol 1000 with the function of giving the formulation a creamier consistency typical of a W/O emulsion.
Composition per 100 grams:
The following table reports the quantities of Caffeic Acid, Rhamnetin, Kaempferol, Quercetin, Quercetin dihydrate and Isoquercetin expressed in mg per 100 g of final product.
Stability Assessment of the Final Product
a. Chemical/Physical and Organoleptic Stability
The assessment of the chemical/physical and organoleptic stability was performed using methods commonly accepted by the scientific community for this category of products. The prototypes (OLEO-RUB 1; OLEO-RUB 2; and OLEO-RUB 3) were subjected to heating, freezing and centrifuge cycles operating as follows:
This protocol was applied to all three prototypes starting from 24 hours after preparation and repeating the test every 15 days for a period of 2 months date/preparation with the following outcome:
Microbiological Stability
The investigations used to check the microbiological stability were performed on samples 24 hours after preparation up to samples at 2 months. The protocol envisages the use of Sabouraud Dextrose Agar/Tryptic Soy Agar on which the samples are plated at different dilutions and subsequently incubated at the required temperature for a period comprised between 48 hours and 3 weeks in the event of mould and yeast.
As expected, apart from the presence of a suitable preservative, the almost total absence of free water probably creates absolutely unfavourable conditions for microbial proliferation, which could be interesting considering, along with special types of packaging (Airless), the possibility of not adding any preservative.
b. Multiresidue Pesticide Analysis
The analyses on a sample of dry drug were performed for the purpose of verifying the presence of residues deriving from pesticides; in particular the investigation performed through GC-ITMS; HPLC-DAD focused on searching for: Alalcor, Aldrin+Eldrin, Azinphos-methyl, Carbon disulphide, Chlorpyrifos, Chlorpyrifos methyl, DDT, Dichlorvos, Dimethoate, Disulfoton, Dithiocarbamates, Endosulfan (a and β), Endrin, Heptachlor+epoxide, Hexachlorobenzene, Fenchlorphos, Fenofos, Phosalone, a-, β-, HCH, y, 5, and E-HCH, Lindane, Malathion, Methoxychlor, Parathion, Parathion-methyl, Perthane, Pirimiphos-methyl.
Outcome of Multiresidue Pesticide Analysis<0.01 Ppm
c. Heavy Metal Analysis
The heavy metal concentration was measured on a sample of dry drug using optical ICP-AES (Inductively Coupled Plasma-Atomic Emission Spectrometry) after mineralisation with aqua regia in a microwave oven. This analysis was used to assess the presence of:
Antimony, Arsenic, Boron, Cadmium, Cobalt, Total Chromium, Mercury, Nickel, Lead, Selenium, Tin, Strontium, Thallium, Tellurium, Titanium, Vanadium, Zinc.
Outcome of Heavy Metal Analysis<0.5 Ppm
With regard to the characterisation analyses, we can state that the extract presents a discrete concentration of substances of a polyphenolic nature such as caffeic acid, Kaempferol and Quercetin with its derivatives, which are widely described in literature in terms of their excellent antioxidant properties largely exploited both in the sector of dietary supplements and in the dermatological sector.
PART 2: Efficacy and Toxicity Assessment
The research activity aimed to provide a preliminary assessment of the efficacy and tolerability of the Cream according to the invention, MVT Skin Care, after topical administration. In particular, the intention was to test the ability of the preparation being examined to promote tissue regeneration of the cutis after second grade burns. Furthermore, the study set out to provide a general assessment of the state of health of laboratory animals subjected to acute and chronic treatment with MVT Skin Care cream and to check the presence of any alterations to the functionalities or the structure of the liver and kidneys.
2.1. Efficacy Study—Macroscopic Assessment of the Healing Process
2.1.1. Animals
Male Sprague-Dawley rats (Charles River, Calco, Como, Italy) were used for the study, kept at a temperature of 22±2° C., relative humidity 55±10%, with a light/dark cycle of 12 hours, food and water ad libitum. The experimental activity began at least 7 days after the animals arrived in the laboratory at the stalling facility, so as to enable them to suitably adapt to the new environmental conditions.
2.1.2. Experimental Model
On the day of the intervention the rats were anaesthetised by intraperitoneal administration of Equithesin. After the laboratory animal had reached a deep state of unconsciousness, the animal's back was shaved (anterior part of the back), which was then disinfected and exposed to a heat source in one point. The heat source comprised a small circular metal plate (diameter 1.5 cm) heated to a temperature of 80° C. The plate was positioned on the animal's cutis for 15 seconds. For the purpose of standardising the method, the plate was rested on the animal's cutis without applying any pressure, apart from that connected with the weight of the plate itself (100 g). Immediately after contact with the hot plate, the cutis was cooled with physiological solution at 4° C. for 10 seconds.
2.1.3. Topical Treatment and Macroscopic Assessment of the Healing Process
Topical administration was performed twice a day for a period of 15 days. The administration consisted of placing a sufficient quantity of the compound being examined to cover the whole area of skin previously exposed to the heat source. The wounds were washed with sterile physiological solution before every dressing.
The experimental protocol comprised the following experimental groups:
Each experimental group consisted of 15 rats.
The macroscopic assessment of the healing process of the wound was performed on the 1st, 3rd 5th, 7th 13th and 15th day. The wounds were photographed with a digital camera (Coolpix, Nikon, USA) and analysed using image analysis software (Digimizer 4.2, MedCalc Software, Belgium) to assess the healing status. In particular, the area of the wound was calculated which, due to the presence of scabs or clear redness, appeared to have an altered macroscopic structure.
The healing speed of the burn was expressed as the wound contraction ratio (WCR %):
Where A0 and At refer to the initial area of the wound and the area at time t, respectively.
Statistical analysis of the experimental data was performed using the Two-way test ANOVA for repeated tests, followed by the Bonferroni test for the internal comparison of the groups.
The liver and kidneys of the laboratory animals were taken out and placed in paraformaldehyde at 4% for histological analysis if required.
2.2. Systemic Toxicity Studies
2.2.1 Design and Experimental Groups
In order to assess whether during the course of the entire treatment undesired phenomena could be highlighted in the experimental groups subject to treatment with the preparation being examined, some parameters were evaluated for the purpose of experimentally assessing the toxicity of the product. The first datum evaluated was whether during treatment the death of any individuals or the presence of clear behavioural modifications attributable to an altered state of health could be observed.
For the purpose of highlighting a possible toxic or harmful effect of the preparation being examined after acute and chronic topical administration (15 days, twice a day), the presence of any morphological modifications in the liver and kidney tissue was also assessed through autoptic and histological tests. Finally, some urine and blood tests were performed which could indicate compromised liver or kidney function.
In particular, the possible damage to liver function was assessed by analysing the plasma levels of the following markers:
To assess the efficacy of the cicatrisation phenomena, but also the possible worsening thereof following treatment with the preparation, some hematic parameters were measured, such as:
To assess possible damage to kidney function the following markers were measured:
The experimental groups provided were:
Skin Care
The experiments were performed on 6 animals per experimental group.
2.2.2. Experimental Procedure
2.2.2.1. Chronic Treatment
After the burn, the rats were subjected to chronic topical treatment (15 days, administration twice a day) as previously indicated. Two hours after the last topical administration with MVT Skin Care Cream and with physiological solution only, a urine sample was taken and the laboratory animal was anaesthetised. Once the laboratory animals had reached a state of deep unconsciousness induced by the intraperitoneal administration of equithesin, an intracardiac blood sample was taken and macroscopic analysis of the organs present in the abdominal cavity was performed.
Finally, the liver and kidneys were removed, whose macroscopic structure was observed, to then be quickly fixed in 4% paraformaldehyde.
2.2.2.2. Acute Treatment
The laboratory animals were anaesthetised in order to be able to perform the burn protocol previously described. Two hours after the application of the hot plate, topical administration of MVT Skin Care Cream or physiological solution alone was performed. Two hours after administration, the urine sample was taken and the laboratory animal was anaesthetised. Once the laboratory animals had reached a state of deep unconsciousness, an intracardiac blood sample was taken and macroscopic analysis of the organs present in the abdominal cavity was performed. Finally, the liver and kidneys were removed, whose macroscopic structure was observed, to then be quickly fixed in 4% paraformaldehyde.
With reference to the kidney parameters, equithesin was used as an anaesthetic, whereas the hepatic parameters were evaluated in animals subjected to anaesthetic/analgesic with morphine (5 mg/kg SC) and medetomidine (0.1 mg/kg, IM).
The use of different types of anaesthetic/analgesic was necessary due to the complaint that repeated administration of equithesin caused an excessive alteration of the hepatic function parameters. Consequently, it was preferred to repeat the experiment using an analgesic/anaesthetic procedure with a lower impact on hepatic function.
2.2.3. Analysis Procedure
2.2.3.1. Blood and Urine Analyses
The biochemical/clinical analyses (ALB, AST, ALT, ALP, Urea and Creatinine) were performed using an automatic biochemical analyser (BS-120 Chemistry analyzer, Mindray Medical International Limited, Milan, Italy) and specific reactants bought from Mindray. The chemical/physical urine test was conducted using a reflectance photometer (UA Vetlab analyzer, Idexx Laboratories Inc., Novara, Italy) and Idexx UA stripes reactants, while the Prothrombin time and Fibrinogen were measured using a coagulometer (ACL 7000, IL Instrumentation Laboratory, Milan, Italy) and IL Instrumentation Laboratory reactants. The fibrinogen was measured using the Clauss method.
2.2.3.1. Histological Analyses
The kidney and liver tissue fixed with 4% paraformaldehyde was dissected into slices 15 μm thick using a cryostat (CM-3050, Leica, Germany). The slices of tissue were assembled onto a slide and coloured using the haematoxylin and eosin colouring method. The microscopic structure was visualised using a brightfield microscope (BX-60, Olympus, Italy).
3) Results
The invention is described as a therapeutic dermatological product for topical use, very effective as a coadjuvant in therapy for burns and skin pathologies in general, particularly of the inflammatory type, control and attenuation of wounds and, considering its origin, it can be considered a traditional plant medication. The demonstration of the essential requirements (efficacy and safety) was obtained with a careful clinical assessment based on pre-existing clinical data and ad hoc clinical investigations. It can be stated that in the clinical assessment of the product, the essential safety and intrinsic performance requirements thereof were considered. The product, which exclusively comprises vegetable extracts from medicinal plants, has enjoyed a sufficiently long and constant tradition and a very long period of use for over 200 years and up to now its valid efficacy has been demonstrated based on long-term use and experience. The invention, which has been shown to be innocuous under normal conditions of use, has astringent, antiphlogistic, antiseptic (meaning a protective barrier to entry from the outside and against the growth of pathogenic germs), haemostatic and soothing actions in a single solution. The extract is very effective in the treatment of burns and, in general, all cutaneous-mucosal pathologies that require the reactivation of epithelial neoformation processes: burns, bruises, grazes, abrasions, rhagades, ulcers, radiodermatitis, bedsores, torpid sores, traumatic and surgical wounds, eczema, chilblains, dyshidrosis, itching, allergic rash, insect bites, herpetic and erythematous lesions, dermatitis, dermatosis, folliculitis, furunculosis, sunburn, post-laser erythema, nappy rash, vulvitis and vaginitis, acne rosacea and vulgaris, and as a coadjuvant in the cicatrisation of surgical wounds etc. The product's marked beneficial coadjuvant-therapeutic, effective and fast action is performed on the surfaces of the skin and mucosa through the formation of a protective cuticle against chemical, bacterial, mechanical and irritative agents in general, probably due to the precipitation and transformation of the tissue proteins. This leads to reduced tissue secretion and removal of water from the inflamed tissues. In burns, in particular, it soothes pain, reduces losses of serum, protects the wound against bacterial invasion, promotes excellent tissue cicatrisation, almost completely reducing scarring retraction with complete restitution of the newly formed tissues, providing excellent elasticity of the skin and mucosa. Repeated application of the product in the pathologies indicated above has never highlighted, either before or over the last 20 years of use, any immediate and/or delayed local or systemic side effect and neither have any cases of individual hypersensitivity or adverse reactions to the product occurred.
3.1. Efficacy Study—Macroscopic Assessment of the Healing Process
The application of the hot plate produced a clear emergence of the blister that characterises second degree burns (
The present invention has been described for non-limiting illustrative purposes, according to its preferred embodiments, but it is to be considered that any variations and/or modifications may be made by experts in the field without departing from the relative scope of protection, as defined by the appended claims.
The comparison between the extracts obtained through the procedure described in document IT 0001265649 (ITCA930003) (OLEO-RUB sample) and that obtained through the method according to the present patent application (OLEO-RUB.ESS sample) highlights how the extraction procedure according to the present invention causes an undoubtedly higher extractive capacity in reference to active phytocomplexes of a polyphenolic nature, i.e. the main substances responsible for the therapeutic activity found in the resulting ointment.
OLEO RUB sample—obtained by inserting 25 grams of Rubus Ulmifolius buds in 75 grams of refined olive oil (official pharmacopoeia specifications) previously heated to 150° C. The buds are left in oil for 2 minutes monitoring the temperature which undergoes an initial reduction of about 25° C. (hence the temperature reaches 125° C.) then returning to 142° C. after the 2 minutes, the time in which the extraction process finishes. The oil and buds are moved away from the heat source and the oil is filtered and appropriately preserved.
OLEO-RUB.ESS sample obtained by inserting 7.5 grams (7.5 grams of dried buds which correspond to 25 grams of fresh buds) of Rubus Ulmifolius buds, previously dried in a ventilated stove at 40° C. for 24 hours, in 92.5 grams of refined olive oil (official pharmacopeia specifications). The extraction was performed leaving the drug in contact with the oil for 240 hours (10 days) at room temperature (±25° C.). After 10 days the sample was filtered and appropriately stored for suitable analyses.
From the analysis of the OLEO-RUB sample, obtained using medicinal oil and extraction according to the method of the prior art, i.e. heating the oil to 150° C. and then adding an appropriate quantity of buds, some differences are highlighted with respect to the blank. In the first place, a certain background noise can be heard in the main area of interest (52-57) which indicates the presence, although infinitesimal, of something that derives from the bud which, probably due to the reduced extraction time and also the absolute quantities used (also in the analysis), does not lead to a well resolved peak. Therefore, it was not possible to instrumentally detect which active substances are potentially present in the extract or their concentration. In the second place, further to a small shift in retention times, two small peaks can be seen at 62.176 and 63.232 which were not present in the blank. For these peaks it is justifiable to consider that they derive from a fractionation and/or modification of the responsible component(s) respectively of this signal at retention time 61.823 and 62.686 hence indicating that these peaks do not derive from the bud but from components already present in the oil.
Following the fractionation and identification of the component present in the first peak of the extract according to the present invention, it was possible to identify that the main components were Caffeic Acid, Rhamnetin, Kaempferol and Quercetin.
Unlike the description contained in the document ITCA930003, wherein the peaks relative to the polyphenolic component as above are difficult to highlight, the extraction process according to the present invention allows the extraction of a much higher significant quantity of polyphenolic component with respect to the traces only just detectable in the extract obtained according to the prior art. Hence, the ointment according to the present invention will be characterised by an undoubtedly higher concentration of active phytocomplex in comparison with the product indicated in document ITCA930003. The active species characterised and that certainly represent important exponents of the active phytocomplex present in the extract are, for example:
0.3% (w/w) of Caffeic Acid or however at least 0.2% (w/w); 0.41% (w/w) of Rhamnetin or however at least 0.3% (w/w); 0.35% (w/w) of Quercetin or however at least 0.3% (w/w) and 0.25% (w/w) of Kaempferol or however at least 0.2% (w/w).
The extract according to the present invention is more effective in the treatment of cutaneous and mucosal pathologies in comparison with the extract described in Italian patent IT0001265649. In particular, for the same cutaneous or mucosal lesion and administration, the extract according to the present invention determines a more marked action promoting cutaneous regeneration and quicker healing in comparison with the extract prepared according to the prior art.
| Number | Date | Country | Kind |
|---|---|---|---|
| RM2013A000337 | Jun 2013 | IT | national |
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/IT2014/000160 | 6/11/2014 | WO | 00 |
