PL246201B1 - Liquid soap - Google Patents

Abstract

The liquid soap contains, as a care ingredient, from 0.01% to 85% by weight of an aqueous grape pomace extract obtained by the micellar extraction technique of ground red grape pomace in an extraction solution which contains as exclusive ingredients water, decyl glucoside and a mixture of benzyl alcohol, benzoic acid, dehydroacetic acid and tocopherol. After mixing the grape pomace extract and the other ingredients, the liquid soap contains from 29.5% to 99.499% by weight of water, from 0.001% to 30% by weight of decyl glucoside, and from 0.01% to 1.5% by weight of a mixture of benzyl alcohol, benzoic acid, dehydroacetic acid and tocopherol, derived at least in part from the extract. In addition, the liquid soap contains from 0.1% to 25% by weight sodium salt of glutamic acid N-acylated with coconut fatty acids, from 0.01% to 1.5% by weight of citric acid, from 1% to 5% by weight of xanthan gum.

Description

Description of the invention

The subject of the invention is a liquid soap intended for washing the body.

Liquid soaps commonly known in the art contain from 0.1 to 75% by weight of surfactants, from 0.1 to 20% by weight of solubilizer and/or hydrotrope, from 0.1 to 10% by weight of moisturizing and/or skin lubricating substances, from 0.5 to 5% by weight of sequestrants, from 0.05 to 3% by weight of fragrance compositions, from 0.01 to 0.5% by weight of preservatives, from 0.1 to 4% by weight of viscosity modifiers, and from 5 to 85% by weight of water.

As surfactants, compounds preferably from the groups of nonionic and/or anionic and/or amphoteric surfactants are used. As anionic surfactants, compounds from the groups of alkyl ether sulfates, alkyl sulfates, alkyl sulfonates, soaps, alkyl phosphates, alkyl sulfosuccinates or similar compounds slightly modified by attaching ethylene oxide and/or propylene oxide to them are used, as nonionic surfactants, nonionic surfactants from the groups of ethylene oxide adducts and/or adducts of a mixture of ethylene and propylene oxides to compounds containing in their structure an alkyl chain having a length of 8 to 22 carbon atoms, preferably ethoxylated and/or ethoxylated-propylene ethoxylated; fatty alcohols, fatty acids, esters of higher fatty acids, vegetable oils, sorbitan esters; alkyl polyglucosides; alkanolamides; while amphoteric surfactants used are compounds from the alkyl betaine and/or alkylamido betaine groups or similar compounds slightly modified by attaching ethylene oxide and/or propylene oxide to them.

Ethyl alcohol and/or isopropyl alcohol and/or propylene glycol and/or butylene glycol and/or pentylene glycol and/or hexylene glycol butyl ether and/or butylene glycol propyl ether are used as solvents, and sodium cumenesulfonate and/or sodium toluenesulfonate and/or urea and/or phosphoric acid esters are used as hydrotropes.

Glycerin, sorbitol, glycols, polyglycols, amino acids, fatty derivatives or lanolin derivatives are used as moisturizing and/or lubricating substances.

Sequestrants are usually compounds derived from citric acid and/or phosphoric acid and/or lactic acid and/or gluconic acid and/or edetic acid.

Viscosity modifiers used include compounds from the group of inorganic salts, mainly sodium chloride and/or potassium chloride, polymeric compounds from the group of cellulose derivatives, mainly carboxymethylcellulose and/or hydroxyethylcellulose and/or hydroxypropylcellulose and/or methylcellulose and/or hydroxypropylmethylcellulose, polymeric compounds from the group of polycarboxylates, mainly sodium polyacrylate or similar slightly chemically modified compounds, compounds from the group of minerals, mainly bentonites and/or hectorites and/or montmorillonites.

Manufacturing traditional liquid soaps most often involves preparing a premix of the viscosity modifier with some water and then adding and mixing the remaining components.

Liquid soaps based on natural ingredients are known from the state of the art.

An example of this is the liquid soap described in KR20210003505A, which contains plant substances from mint, Korean blackberry, epimedium, dogwood, among others, as anti-allergic and nutritional additives. Additionally, the soap contains essential oils, a thickener and moisturizing substances.

Other liquid soaps are also based on plant-based raw materials, including those in accordance with the description CN105434215A, which are obtained using ultrasonic-assisted solvent extraction using 50% ethanol solution, from plants such as: sophora shrubby, silver wormwood, abrasive, comfrey or white peony root. In addition to their care properties, these soaps also have antibacterial properties.

Liquid soaps described in CN105997753A are made using juice from waste vegetable leaves. In addition, these soaps contain other plant extracts, obtained from, among others, plumeria, ginger root and Indian soapberry. Additionally, the soaps contain peppermint oil and aloe vera gel. These soaps improve the condition of the skin, soothe inflammation and reduce itching.

Chinese patent description CN106236637 indicates the benefits of using grape seeds. They are rich in polyphenols, vitamins, minerals, etc. They have antioxidant properties, improve skin elasticity, whiten, moisturize, remove freckles, reduce wrinkles, make the skin soft and smooth; they help prevent skin allergies and various skin diseases. An interesting alternative is the use of grape pomace. This is a waste material from wine production, which can be a full-value raw material for obtaining extracts rich in bioactive ingredients, including polyphenols or organic acids. They are used in the cosmetics, food or pharmaceutical industries.

Methods of obtaining grape pomace extracts are described, among others, in US10485258B2, FR3096582A1 or ES2406858B1. The most commonly used methods are solvent extraction, extraction in the presence of supercritical carbon dioxide and steam distillation.

However, the aforementioned methods require the use of various types of auxiliary substances (amphiphilic solvents, compressed carbon dioxide) or conducting the process at relatively high temperatures (steam distillation), which causes the destruction of bioactive substances. In the case of extraction using supercritical carbon dioxide, the extract obtained has a very high viscosity, which during the production of cosmetics generates the need to heat the cosmetic mass or the need to use amphiphilic solvents. In all of the above cases, the bioactive substances contained in the extract are destroyed or undesirable auxiliary substances are introduced into the composition of the cosmetic. This prevents the full health-promoting potential of grape pomace extracts in cosmetics.

An alternative to standard extraction procedures is micellar extraction. This method allows, by using an aqueous solution of a surfactant - a surface-active compound, to obtain a plant extract at low temperature. However, fully effective use of the mentioned method for selected plant material requires a specific composition of the extraction solution.

The problem remains the need to use additional components in the extraction medium, the presence of which in the target product is not justified and sometimes even undesirable (e.g. Polysorbate 20, Polysorbate 60, PEG-60 Hydrogenated Castor Oil, ethyl alcohol, glycol, glycerin or isopropyl myristate).

Liquid soap containing agents of natural origin with a care and washing effect and auxiliary agents is characterized in that it contains, as an agent with a care effect, reducing the irritation potential and indirectly influencing the limitation of skin drying after the washing process and imparting a color to the preparation in shades of red, from 0.01 to 85% by weight of an aqueous extract of red grape pomace containing extracted plant components and obtained by the micellar extraction technique, wherein 1 to 30% by weight of ground red grape pomace is subjected to the action of the extraction solution, and the extraction solution contains, as exclusive ingredients, from 64.5 to 98.89% by weight of water; from 0.1 to 4% by weight of decyl glucoside and from 0.01 to 1.5% by weight of a mixture of benzyl alcohol, benzoic acid, dehydroacetic acid and tocopherol as a preservative. Water acts as a solvent, and decyl glucoside as a surfactant. The ingredients used in the extraction solution are also the target ingredients of the cosmetic, so there is no need for additional purification of the extract obtained, nor the risk that undesirable substances will be introduced into it. The ingredients used in the extraction solution are fully transferred to the extract along with the extracted plant ingredients. After mixing the red grape pomace extract with the remaining agents included in the soap, the liquid soap contains at least partially derived from the extract:

- from 29.5 to 99.499 wt.% water, from 0.001 to 30 wt.% decyl glucoside as a substance with a washing action and from 0.01 to 1.5 wt.% of a mixture of benzyl alcohol, benzoic acid, dehydroacetic acid and tocopherol, and additionally

- from 0.1 to 25 wt.% of sodium salt of glutamic acid N-acylated with coconut fatty acids as a washing agent, from 0.01 to 1.5 wt.% of citric acid as a pH regulator, from 1 to 5 wt.% of xanthan gum as a viscosity modifier.

The composition of the extraction solution is based solely on the ingredients intended for the production of the final preparation and has been selected in such a way that it is possible to obtain appropriate aggregates (micelles) in the volume phase, ensuring the possibility of effective leaching of cosmetically valuable ingredients from the plant material. The extract obtained is composed solely of ingredients intended for the production of the final preparation and is intended for direct use in cosmetics intended for hygiene. Immediately after the process is completed, the extract is added to the cosmetic mass. Apart from substances isolated from the plant material, no other additional substances (e.g. alcohols, glycols or unnecessary surface-active compounds) are introduced into the cosmetic mass. The micellar extraction itself is carried out at room temperature (up to a maximum of 30°C). The relatively low temperature of the process does not cause degradation of the active plant ingredients and therefore does not reduce or eliminate their advantages. The grape pomace extract obtained by this method is characterized by high naturalness, does not contain amphiphilic solvents and is microbiologically clean. It is an optimal ingredient of liquid soap, giving the preparation a red or orange color, soothes allergic reactions, has anti-inflammatory effects, protects the skin from free radicals, reduces irritation potential and indirectly affects the reduction of skin drying after the washing process. Additionally, the soap is characterized by very good foaming and rheological properties.

The subject of the invention is presented in detail in the embodiment examples.

Example 1

In the first stage of manufacturing liquid soap according to the invention, an extraction solution was prepared which contained 97.5% by weight of distilled water as a solvent, 2% by weight of decyl glucoside as a surface-active compound, allowing the formation of aggregates (micelles) in the bulk phase of the extraction solution, thus enabling the leaching of bioactive substances of a hydrophobic nature from grape pomace, and 0.5% by weight of a mixture of benzyl alcohol, benzoic acid, dehydroacetic acid and tocopherol as a preservative (Euxyl K903). Red grape pomace was introduced into the extraction solution in a weight ratio of extraction solution: pomace of 9:1. The extraction was carried out at room temperature (not exceeding 30°C), with vigorous stirring for 3 hours. After the extraction process was completed, the solids remaining after the grape pomace were removed by centrifugation, thus obtaining an aqueous extract of red grape pomace, ready to be introduced into soap. The extract, apart from the extracted plant components, contained all the components of the extraction solution in unchanged amounts.

The liquid soap was then prepared by mixing the extract obtained in this way as a substance imparting a red colour to the preparation, soothing allergic reactions, having anti-inflammatory action, protecting the skin against the action of free radicals, reducing the irritation potential and indirectly limiting the drying of hand skin after the washing process with the remaining agents included in the soap. The aforementioned extract in an amount of 25% by weight was mixed with 4% by weight of sodium salt of glutamic acid N-acylated with fatty acids from coconut oil - as the basic compound with a washing action, 2.5% by weight of decyl glucoside as an auxiliary compound with a washing action, 0.2% by weight of citric acid allowing to obtain a pH value of the preparation equal to 6.5, and 0.78% by weight of xanthan gum as a viscosity modifier and 0.8% by weight mixture of benzyl alcohol, benzoic acid, dehydroacetic acid and tocopherol as preservative (Euxyl K903). The rest of the mixture was water.

Liquid soap with the given composition had the following physicochemical and functional properties: stability in load and thermal tests, colour in shades of red - L*a*b* parameters, respectively: 33.27; 2.21 and 13.55 (soap without extract had: 39.41; -0.97 and 0.19, respectively, the colour difference ΔΕ between soap with extract and soap without extract was 15.0), skin hydration level after 2 hours from the washing process - an increase of 0.73% compared to the skin not subjected to the washing process (analogous liquid soap without grape pomace extract caused a decrease in hydration to the level of -1.08% compared to the skin not subjected to the washing process - in this case a drying effect was demonstrated), irritation potential (zein number) 94 mg N / 100 ml (liquid soap without grape pomace extract - value 112 mg N / 100 ml). Out of 20 people using liquid soap, 17 noticed a caring effect.

Example 2

In the first stage of manufacturing liquid soap according to the invention, an extraction solution was prepared, which contained 97.5% by weight of distilled water, 2% by weight of decyl glucoside and 0.5% by weight of a mixture of benzyl alcohol, benzoic acid, dehydroacetic acid and tocopherol (Euxyl K903). Red grape pomace was introduced into the extraction solution in a weight ratio of extraction solution: pomace of 8:2. Extraction was carried out at room temperature (up to max. 30°C); with vigorous stirring for 3 hours. After the extraction process was completed, the solids remaining after the grape pomace were removed by centrifugation, thus obtaining an aqueous extract of red grape pomace, ready to be introduced into soap. The extract, apart from the extracted plant components, contained all the components of the extraction solution in unchanged amounts.

Liquid soap was then prepared by mixing the extract obtained in this way with the other soap ingredients. Said extract, in an amount of 25% by weight, was mixed with 4% by weight of sodium salt of glutamic acid N-acylated with coconut fatty acids, 2.5% by weight of decyl glucoside, 0.2% by weight of citric acid to obtain a pH value of 6.5 for the preparation, and 0.78% by weight of xanthan gum and 0.8% by weight of a mixture of benzyl alcohol, benzoic acid, dehydroacetic acid and tocopherol (Euxyl K903). The rest of the mixture was water.

The liquid soap obtained in this way had the following physicochemical and functional properties: stability in load and thermal tests, colour in shades of red - L*a*b* parameters, respectively: 17.96; 1.68 and 8.13 (soap without extract had: 39.41; -0.97 and 0.19, respectively, the colour difference ΔΕ between soap with extract and soap without extract was 23.0), skin hydration level after 2 hours from the washing process - an increase of 1.18% compared to the skin not subjected to the washing process (analogous liquid soap without grape pomace extract caused a decrease in hydration to the level of -1.08% compared to the skin not subjected to the washing process - in this case a drying effect was demonstrated), irritation potential (zein number) 84 mg N / 100 ml (liquid soap without grape pomace extract - value 112 mg N / 100 ml). Out of 20 people using liquid soap, 17 noticed a caring effect.

Claims (1)

1. Liquid soap containing natural origin agents with a care and washing effect and auxiliary agents, characterized in that it contains, as an agent with a care effect, reducing the irritation potential and indirectly influencing the limitation of skin drying after the washing process and imparting a red shade to the preparation, from 0.01 to 85% by weight of an aqueous extract of red grape pomace containing plant ingredients and obtained by the micellar extraction technique, wherein from 1 to 30% by weight of ground red grape pomace is subjected to the action of an extraction solution which contains, as exclusive ingredients, from 64.5 to 98.89% by weight of water, from 0.1 to 4% by weight of decyl glucoside and from 0.01 to 1.5% by weight of a mixture of benzyl alcohol, benzoic acid, dehydroacetic acid and tocopherol such that, after mixing the red grape pomace extract and the other agents, the liquid soap contains derived at least in part from the extract: - from 29.5 to 99.499 wt.% water, from 0.001 to 30 wt.% decyl glucoside and from 0.01 to 1.5 wt.% of a mixture of benzyl alcohol/benzoic acid, dehydroacetic acid and tocopherol, and additionally - from 0.1% to 25% by weight of sodium salt of N-acylated glutamic acid with coconut oil fatty acids, from 0.01 to 1.5% by weight of citric acid, from 1 to 5% by weight of xanthan gum.