Patent Application
20250134799
The present invention relates to a gel composition for topical use comprising active ingredients for the prevention of damage from oxidative stress due to sun exposure and for the prevention of skin tumours. The invention relates in particular to a composition containing a glyceric extract of Vitis vinifera obtained from the pomace of the Nero di Troia vine and xanthan gum, optionally with the addition of sunscreens, in which the glyceric extract is optionally obtained by ultrasound extraction.
It is known that inflammatory factors and oxidative stress, also stimulated by exposure to sunlight, are involved in the formation and proliferation of skin neoplasms. The antioxidative effect of resveratrol is also known.
Patent application US2016287531 A1 reports methods of treating skin disorders by administering a composition, in particular in the form of a nano-emulsion, comprising a therapeutic amount of a substituted cis- or trans-stilbene or a hybrid stilbene, preferably an analogue of resveratrol, and at least one antibiotic. The claimed compounds and methods are indicated to be useful for treating skin conditions characterized by inflammation, particularly tumours. Previous studies on resveratrol, in the context of carcinogenesis and as a chemo-preventive agent, have shown that this molecule inhibits the three stages of carcinogenesis. Resveratrol has shown anti-oxidative properties, to which the anti-inflammatory activity is also attributed.
Patent application US2019201318 A1 mentions a cosmetic composition for topical use to counteract the signs of aging, containing, in addition to other active ingredients present in the fir extract, polyphenols selected from monomers and oligomers of proanthocyanidins, hydroxystilbenes, flavonoid monomers and oligomers and their derivatives and mixtures.
Patent application US2010310615 A1 relates to compositions for cosmetic, dietetic and therapeutic use comprising polyphenolic stilbenoid derivatives, useful for preventing and controlling pathologies and aging of living organisms and tissues.
The use in the pharmaceutical, nutraceutical and cosmetic fields of polyphenols and in particular resveratrol from Vitis vinifera extracts is known.
The stilbene polyphenols concentration in these extracts varies according to the grapevine variety and also according to the parts of the plant, from which the extract is obtained.
A comparative study on the flavonoids and stilbene content of the red grape varieties Susumaniello, Uvalino and Nero di Troia (specific small acinus biotype), conducted by Suriano et al. [Conference Paper, August 2011, www.researchgate.net/publication/271518705] on different parts of the acinus (peel, seeds and juice) showed that nutraceutical substances present in the three varieties show significant differences in terms of quality and quantity. In particular, Uvalino is characterized by the higher content of stilbene compounds, while the other two varieties have a higher average concentration than other Italian red grape varieties and Nero di Troia has the highest content of total flavonoids, polyphenols and proanthocyanidins.
Studies conducted by Antonacci et al. (L'Enologo, no. 3—March 2015) show that the variety of Vitis vinifera Nero di Troia has a high polyphenolic concentration, even higher in the small acinus variety than in the large acinus variety.
The different extraction methods also have an impact on the concentrations of recovered polyphenols, especially resveratrol, as shown by Roselli et. al (Clinical Immunology, Endocrine & Metabolic Drugs, 2015, 2, 8-12) in a comparative study between microwave-assisted extraction and extraction by convection heating, applied to the pomace of Uva di Troia Canosina.
Catalan et. al (Hindawi Publishing Corporation, ISRN Analytical Chemistry, Volume 2013) conducted a study to evaluate the polyphenolic content of “Uva Di Troia Canosina”. The seeds and peels, collected at four different stages of the fermentation process, were extracted by maceration, and the purified extracts were analysed to study the influence of fermentation on the polyphenol content. Seed extraction was performed by multistep maceration with ethanol and acetone, furthermore the extracts were purified with pure ethyl acetate. The extraction of the peels, on the other hand, was obtained by maceration in a single step in methanol and purification with a brominated synthetic adsorbent resin. The evaluation of the extraction yield and the polyphenolic content was carried out by TLC (ThinLayerChromatography), UV/VIS (Ultra Violet/VISible) and LC/DAD (Liquid Chromatography with photoDiode Array Detection) analysis. The characteristic polyphenols (catechin, epicatechin and procyanidin B1 and B2) were present in the seed extracts, useful for the development of a nutraceutical product, endowed with antioxidant properties, while no resveratrol was found in the Troia canosine grape skin extracts, also in an LC/MS-MS analysis (Liquid Chromatography-tandem Mass Spectrometry).
Object of the present invention is a gel composition for topical use comprising xanthan gum, a glyceric extract of pomace of Vitis vinifera of the Nero di Troia vine together with pharmaceutically acceptable excipients.
According to one aspect of the invention, the glyceric extract is present in the composition in an amount ranging from 10% to 60% by weight, preferably from 20% to 50% by weight.
According to another aspect in the composition xanthan gum is present in an amount from 0.5% to 4% by weight, preferably from 1% to 2% by weight.
Moreover, according to a further aspect, the composition of the invention comprises UVA, UVB sunscreens in quantities sufficient to obtain SPF 50 protection.
A further object of the present invention is the use of the composition described above for the prevention of damage from oxidative stress due to sun exposure and for the prevention of skin tumours. Skin cancer is the most common type of cancer and generally develops in areas of skin exposed to the sun and people with fair skin (less skin pigmentation) are more at risk. The most frequent forms of skin cancer are basal cell carcinoma (about 80%), squamous cell carcinoma (about 16%) and melanoma (about 4%).
The glyceric extract of pomace of Vitis vinifera of the Nero di Troia vine is preferably obtainable by ultrasound extraction at room temperature for 4-10 minutes in a mixture of 50-80% by weight of glycerine and 20-50% by weight of water.
The process for the preparation of said glyceric extract of the pomace of Vitis vinifera of the Nero di Troia vine includes, in fact, extraction with ultrasound at room temperature for 4-10 minutes in a mixture of 50-80% by weight of glycerin and 20-50% by weight of water.
A further object of the present invention is the glyceric extract obtained through this method.
The process for the preparation of the composition of the present invention comprises the mixing of xanthan gum with the glyceric extract of pomace of Vitis vinifera of the Nero di Troia vine together with pharmaceutically acceptable excipients.
The term “pomace” here refers to the residue from the pressing of the grapes consisting of stalks, skins, seeds also containing a certain quantity of wine or fermented must.
Therefore, the present invention also has the advantage of using natural and waste raw materials, which derive from the preparation of wine. The pomace is in fact used to prepare the glycolic extract of the present invention without the need to separate the stalks, from the peels or from the seeds.
The term “xanthan gum” or xanthan is here meant to refer to a complex polysaccharide consisting of hexoses, mainly D-glucose and D-mannose, and D-glucuronic and pyruvic acids. This high molecular weight polysaccharide is obtained by bacterial fermentation of a simple carbon hydrate, such as glucose or sucrose. Xanthan gum is also used in the food sector, where it is used as a thickening and stabilizing additive, marked by the code E415. A minimal addition of this additive (0.5-1% or less) will greatly increase the viscosity of a liquid composition. Xanthan gum is commercially available from various suppliers, such as Bema Cosmetici srl based in Borsea-Rovigo.
The term “pharmaceutically acceptable excipients” is here meant to refer to excipients of the conventional type, i.e. compounds inert towards the active ingredient and the pharmaceutical form and non-toxic for the subject to whom they are administered. In the case of the present invention useful classes of such excipients are for example: diluents (compounds added when the mass of the active ingredient is not sufficient for the preparation of the composition) and antioxidants-antimicrobials (used to extend the shelf life of the product). Examples of such pharmaceutically acceptable excipients are given in Remington's Pharmaceutical Sciences, 18th Ed. (1990, Mack Publishing Co., Easton, Pa. 18042, pages 1435-712).
According to the data generated by the inventors and herein reported in the section “Examples”, the glyceric extract of pomace of Vitis vinifera of the Nero di Troia vine led to a statistically significant reduction in the levels of reactive oxygen species (ROS) in an in vitro model of antioxidant activity on human keratinocytes.
Moreover, a study carried out by the inventors and herein reported in the section “Examples” quantifies substances, such as eicosapentaenamide (EPM), 24-hydroxyarachidonate (24-HAC) and ginkgolic acid (GKA), present in the glyceric extract of pomace of Vitis vinifera of the Nero di Troia vine. In particular, the presence of EPM and 24-HAC, derivatives of polyunsaturated acids, and GKA (a 6-tridecylsalicylic acid), which can be used as surfactant-cleansing and emulsifying agent in cosmetics led the inventors to prepare the composition of the invention, i.e. a gel composition for topical use comprising xanthan gum, a glyceric extract of pomace of Vitis vinifera of the Nero di Troia (NdT) vine together with pharmaceutically acceptable excipients.
Finally, the finding that pomace extracts, and in particular that of NdT, can be used as new and promising natural sources of polyunsaturated acid derivatives to modulate rheological properties in cosmetic production renders this innovation a virtuous example of circular green economy.
Some (non-limiting) examples of the present invention are provided below.
The glyceric extract of pomace of Vitis vinifera of the Nero di Troia vine was obtained by preparing a mixture containing 60% by weight of glycerin, 25% by weight of pomace and 15% water.
To this mixture, in order to obtain the extract, ultrasounds were subsequently applied at room temperature for 5 minutes. Subsequently the extract was filtered, obtaining a clear or slightly opalescent liquid with a dark purplish colour.
The following preservatives were then added to said extract: 0.60% by weight of benzyl alcohol, 0.18% by weight of sodium benzoate and 0.12% by weight of potassium sorbate.
The glyceric extract thus obtained (also named as GExtract NdT) was used for the assays reported in the following Examples 4-6.
The gel for topical use is obtained by diluting the GExtract NdT obtained in Example 1 with water in different proportions depending on the concentration of the compositions to be prepared 1:1, 1:2 or 1:4.
Subsequently to the dilution, xanthan gum is added, little by little, between 1 gram and 2 grams for every 100 grams of liquid mixture prepared and is mixed until the desired density is obtained. Subsequently, the gel obtained is left to rest for 24-48 hours.
The efficacy of the composition obtained in Example 2 alone or in comparison with other compositions containing other Vitis vinifera pomace extracts is evaluated by carrying out one or more of the following tests/assays.
The aim of this study was to evaluate in vitro the effect of GExtract NdT (obtained in Example 1) on the viability of the human keratinocyte cell line HaCaT. The evaluation was performed on cells exposed to GExtract NdT at a dilution of 2% in complete medium for 24 hours.
The cellular viability was measured by MTS colorimetric essay through the absorbance measurement obtained from the conversion of a bioreduced tertazolium compound from viable cells into a coloured formazan soluble in the culture medium.
The HaCaT cells were exposed for 24 hours to 2% of GExtract NdT of and Triton-X 100 and subsequently the viability was evaluated by MTS assay. The results are reported in Table 1.
In the HaCaT cells exposed for 24 hours at increasing concentrations of Triton-X 100 (used as positive control) a marked negative effect on cell viability was recorded already at the lowest tested concentration. The surfactant lysed all the cells starting from the concentration of 0.01%. The treatment with GExtract NdT had no effect on the cell viability at the concentration of 2%.
In the study no bacterial contaminations were found in the treatment chamber, while a concentration-dependent reduction in the number of viable cells was recorded in cells treated with the surfactant Triton-X (used here as a cell lysing treatment). The study can therefore be considered valid.
No statistically significant effects were observed in the cells treated with GExtract NdT for 24 hours at 2% v/v concentration.
From the data obtained using the in vitro test described herein and under those experimental conditions, we can conclude that: GExtract NdT did not lead to a statistically significant viability reduction in HaCaT cells exposed for 24 hours to a concentration of 2% v/v.
The aim of this study was to evaluate in vitro the antioxidant effect of GExtract NdT (obtained in Example 1) on of the human keratinocyte cell line HaCaT. The evaluation was carried out on cells exposed to a 2% dilution of the formulation for 24 hours and subsequently treated with menadione (as an oxidizing stimulus).
The antioxidant activity was quantified as the reduction of Reactive Oxygen Species (ROS) induced by exposure to menadione alone, by dichlorofluorescein diacetate assay.
Pre-treating the cells with GExtract NdT at 2% v/v concentration resulted to be protective against both the stimuli: in fact, a reduction of about 20% and of about 5%, respectively, was registered with regard to menadione at 50 μl and 100 μl. The results of the exposure to menadione after pre-treatment with GExtract NdT are reported in Table 2
The study can be considered valid, because no bacterial contamination was found in the treatment chamber and an increased fluorescence, concentration-dependent, was recorded in the cells treated with menadione (here used as an oxidative treatment).
With regard to antioxidant efficacy, a positive effect was found in cells pre-treated with GExtract NdT. Said effect was marked in pre-treatment with GExtract NdT at 2% v/v, with a percentage reduction of oxidative stress of about 12 and 5%, respectively, against menadione at 50 to 100 μM.
From the results obtained using the in vitro described herein and in those experimental conditions, we can conclude that: GExtract NdT led to a statistically significant reduction in levels of reactive oxygen species (ROS) after 24 hours from treatment with the non-cytotoxic concentration tested in menadione-stimulated human keratinocytes.
In the light of what emerged in our experimental conditions, the antioxidant activity of GExtract NdT is confirmed.
The glyceric extracts obtained from four different varieties of vines (Nero di Troia [NdT], Primitivo, Aglianico and Falanghina) were prepared using the same protocol as described in Example 1, and stored at −20° C. until the start of the analysis cycle. An exactly weighed amount of each extract was analysed through MS-ESI-QTOF spectroscopy to define the relative profiles of the most representative substances in these matrices, such as polyphenols, terpenes and the main metabolites.
The results are also reported in the following Tables A to D and in the 3D pie charts reported in
The results are also reported in the
A preliminary assessment allowed the inventors to detect significant differences among the signal patterns of the three extracts from red vines and the one from white vine (Falanghina).
The number and molecular diversity appear much more contained in the red samples with a prevalence of fatty acid derivatives compared to fermentation metabolites, as a clue of a greater stabilization of the red-derived pomaces.
For some time now, the literature has given a plethora of papers, with numerous citations, aimed at defining and comparing the composition of pomaces by different grape varieties. Nevertheless, only a few works are aimed at the determination of lipids with the exclusion of some contributions inherent the antioxidant properties or as useful nutrients in dietary regimens (Ivana Dimic' et al., Antioxidants 2020, 9, 568, Mariana Spinei et al., Foods 2021, 10 (4), 867 and Yolanda Carmona-Jiménez et al., Molecules 2022, 27 (20), 6980).
To the best of our knowledge, there are no studies that quantify substances such as eicosapentaenamide (EPM), 24-hydroxyarachidonate (24-HAC) and ginkgolic acid (GKA), yet present with dominant signals in the samples of red vines derived pomaces, especially in the Nero di Troia (NDT) sample
In particular, while EPM and 24-HAC, derivatives of polyunsaturated acids, and GKA, a 6-tridecylsalicylic acid, have aroused interest for their therapeutic potential (Sebastià Parets et al., Frontiers in Cell and Developmental Biology, 8, 2020 and Cinzia Giordano et al., Int J Mol Sci 2020 Mar. 26; 21 (7): 2279), their possible use as surfactant-cleansing and emulsifying agent in cosmetics was not known.
Now, in light of our findings, we can affirm that pomace extracts, and in particular that of NdT, can be used as new and promising natural sources of polyunsaturated acid derivatives to modulate rheological properties in cosmetic production in a virtuous example of circular green economy.
| Number | Date | Country | Kind |
|---|---|---|---|
| 102022000001190 | Jan 2022 | IT | national |
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/EP2023/051627 | 1/24/2023 | WO |
