An emulsifier-free oil fat immobilization method based on natural polysaccharide, screening method, composition and application

Abstract

The present application belongs to the technical field of nursing products, and particularly relates to a natural polysaccharide-based emulsifier-free oil fixing method, screening method, composition and application. The natural polysaccharide is dissolved in a self-preservative system, and the obtained natural polysaccharide solution is used to fix oil, so that long-term stable fixation of oil is realized without using an emulsifier, the stability of oil in the oil-containing system is improved, and separation and precipitation of oil in the system are avoided. According to the results of the examples, the oil is fixed by the method of the present application, and the oil can still be stable at 50 DEG C for 30 days without using an emulsifier.

Description

Technical Field

[0001] This invention belongs to the field of nursing product technology, specifically relating to an emulsifier-free oil fixation method, screening method, composition, and application based on natural polysaccharides. Background Technology

[0002] In the personal care industry, emulsifiers are often used to prepare creams and lotions to achieve skin hydration and provide a silky smooth experience when used.

[0003] However, emulsifiers in skincare products have a strong function of emulsifying oils. When applied to the skin and left on for an extended period, these emulsifiers emulsify the sebum bound between the skin's surface and the stratum corneum. When exposed to sweat and water, this sebum is lost, damaging the skin's protective barrier and leading to moisture loss, making the skin drier. Therefore, once you stop using the skincare product, your skin will feel unusually dry.

[0004] Therefore, preparing creams and lotions without emulsifiers is more in line with the nature of human skin. However, almost all commercially available skincare products contain emulsifiers to stabilize the oil components. Long-term use of skincare products containing emulsifiers can easily lead to sebum loss, dry skin, and affect skin health. Summary of the Invention

[0005] The purpose of this invention is to provide an emulsifier-free method, screening method, composition, and application for oil fixation based on natural polysaccharides. This invention dissolves natural polysaccharides in a self-preservative system and uses the resulting natural polysaccharide solution to fix oils. This achieves long-term stable fixation of oils without the use of emulsifiers, preventing oil precipitation and thus solving the problem of sebum loss and dry skin caused by emulsifiers in skincare products.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] An emulsifier-free method for immobilizing oils based on natural polysaccharides involves dissolving natural polysaccharides in a self-preservative system to obtain a natural polysaccharide solution; immobilizing the oils using the natural polysaccharide solution; wherein the water activity of the self-preservative system is ≤0.75; and no oil precipitates out in the mixture formed by the natural polysaccharide solution and the oil.

[0008] Preferably, the self-preservative system comprises water and a water-soluble humectant; the water-soluble humectant comprises one or more of polyols and betaine.

[0009] Preferably, the molecular weight of the natural polysaccharide is 2,000 to 10,000,000 Daltons; the natural polysaccharide includes one or more of agar, xanthan gum, sodium alginate, cassia seed gum, sanxian gum, and vegan gum; the mass ratio of the self-preservative system to the natural polysaccharide is 60 to 100: 0.5 to 5.

[0010] Preferably, the oil includes one or more of vegetable oils, animal oils, mineral oils, and synthetic oils; the mass ratio of the oil to the natural polysaccharide is ≤18:1.

[0011] Preferably, the mineral oil includes mineral esters; the vegetable oil includes one or more of shea butter, olive oil, and sacha inchi oil.

[0012] This invention also provides a method for screening natural polysaccharides with oil-fixing capabilities, comprising the following steps:

[0013] Natural polysaccharides that can dissolve in a self-preservative system were screened to obtain soluble natural polysaccharides; the water activity of the self-preservative system is ≤0.75;

[0014] The soluble natural polysaccharide is dissolved in a self-preservative system to obtain a natural polysaccharide solution;

[0015] The natural polysaccharide solution and oil were heated, mixed, and then cooled to obtain a mixture;

[0016] If the mixture does not release oil under heat preservation conditions, the selected natural polysaccharide has oil-fixing ability.

[0017] Preferably, the heating and mixing includes sequentially heating and stirring and heating and homogenizing; the temperature of the heating and stirring is 80-90°C; the temperature of the heating and homogenizing is 65-70°C, and the time is 2-3 minutes.

[0018] The present invention also provides an emulsifier-free solid-oil composition comprising the following components in parts by weight: 60-100 parts of a self-preservative system and 0.5-5 parts of natural polysaccharides.

[0019] The present invention also provides an emulsifier-free oil composition comprising oil and the solid oil composition described above.

[0020] The present invention also provides the use of the emulsifier-free solid-oil composition or the emulsifier-free oil composition described above in the preparation of cosmetics, care products or ointments.

[0021] This invention provides an emulsifier-free method for immobilizing oils based on natural polysaccharides. The method involves dissolving natural polysaccharides in a self-preservative system to obtain a natural polysaccharide solution; using this solution to immobilize the oils; the water activity of the self-preservative system is ≤0.75; and the oil does not precipitate from the mixture formed by the natural polysaccharide solution and the oil. Typically, aqueous solutions of natural polysaccharides cannot immobilize oils. The inventors accidentally discovered that dissolving natural polysaccharides in a self-preservative system enhances their ability to immobilize oils. Based on this discovery, this invention dissolves natural polysaccharides in a self-preservative system and uses the resulting natural polysaccharide solution to immobilize oils, achieving long-term stable immobilization of oils without the use of emulsifiers. This improves the stability of oils in oil-containing systems and prevents oil separation and precipitation. Results from the examples show that using the method of this invention to immobilize oils, even after 30 days of incubation at 50°C without the use of emulsifiers, the oils remain stable.

[0022] This invention also provides a method for screening natural polysaccharides with oil-fixing capabilities. First, natural polysaccharides that can dissolve in a self-preservative system are screened to obtain soluble natural polysaccharides. Then, the soluble natural polysaccharides are dissolved in the self-preservative system. The resulting natural polysaccharide solution is heated and mixed with oil, then cooled to obtain a mixture. Under heat preservation conditions, if the mixture does not precipitate oil, the screened natural polysaccharide has oil-fixing capabilities. The screening method provided by this invention can screen natural polysaccharides with oil-fixing capabilities and is simple and easy to implement.

[0023] This invention also provides an emulsifier-free oil composition. The emulsifier-free oil composition provided by this invention uses natural polysaccharides instead of emulsifiers to fix the oils, avoiding oil separation and precipitation, and achieving long-term stable fixation of the oils in the system. Applying the emulsifier-free oil composition provided by this invention to cosmetics, care products, or ointments can eliminate the need for emulsifiers, achieving the same protective effect as sebum secreted by the skin. Because it does not contain emulsifiers, the oil composition provided by this invention will not be washed away by sweat, and will not cause sebum loss from the skin barrier due to the emulsifying effect of emulsifiers, solving the problem of sebum loss and dry skin caused by emulsifiers in care products. Detailed Implementation

[0024] This invention provides an emulsifier-free method for immobilizing oils based on natural polysaccharides. The method involves dissolving natural polysaccharides in a self-preservative system to obtain a natural polysaccharide solution; using the natural polysaccharide solution to immobilize the oils; the water activity of the self-preservative system is ≤0.75; and the oils do not precipitate out in the mixture formed by the natural polysaccharide solution and the oils.

[0025] In this invention, the self-preservation system refers to a system that does not contain any preservatives in the traditional sense, but rather achieves the purpose of preservation by controlling the water activity (Aw) of the solution to inhibit the growth and reproduction of microorganisms in the system.

[0026] In this invention, the self-preservative system preferably comprises water and a water-soluble humectant; the water-soluble humectant preferably comprises one or more of a polyol and betaine; the polyol preferably comprises one or more of glycerin, sorbitol, xylitol, ethylene glycol, and pentaerythritol. In specific embodiments of this invention, the water-soluble humectant is more preferably one or more of glycerin, sorbitol, and betaine, specifically a mixture of glycerin, glycerin and sorbitol, or a mixture of glycerin and betaine. In this invention, the mass ratio of glycerin to sorbitol in the mixture of glycerin and sorbitol is preferably 8-9:1-3; the mass ratio of glycerin to betaine in the mixture of glycerin and betaine is preferably 8-9:1-3.

[0027] In this invention, the water activity of the self-preservative system is ≤0.75, preferably ≤0.7. This invention controls the water activity of the self-preservative system to ≤0.75 by controlling the amount of water and water-soluble humectant used. In a specific embodiment of this invention, the mass ratio of the water-soluble humectant to water is preferably 4-6:2-4, specifically 5:3. Typically, aqueous solutions of natural polysaccharides cannot fix oils. The inventors accidentally discovered that using a self-preservative system can enhance the ability of natural polysaccharides to fix oils. Dissolving natural polysaccharides in a self-preservative system with a water activity ≤0.75 results in a natural polysaccharide solution that can replace emulsifiers to effectively fix oils, preventing oil precipitation in the oil composition system.

[0028] In this invention, the natural polysaccharide preferably includes one or more of agar, xanthan gum, sodium alginate, cassia seed gum, sanxian gum, and vegan gum, more preferably agar; the molecular weight of the natural polysaccharide is preferably 2,000 to 10,000,000 Daltons, more preferably 2,000 to 300,000 Daltons. Specifically, the molecular weight of the agar is preferably 2,000 to 140,000 Daltons, the molecular weight of the xanthan gum is preferably 1,000,000 to 10,000,000 Daltons, the molecular weight of the sodium alginate is preferably 350,000 to 500,000 Daltons, the molecular weight of the cassia seed gum is preferably 200,000 to 300,000 Da, the molecular weight of the three-skin gum is preferably 100,000 to 500,000 Da, and the molecular weight of the vegan gum is preferably 500,000 to 1,000,000 Da. By optimizing the molecular weight of the natural polysaccharides, this invention can further optimize the ability of the natural polysaccharides to fix oils.

[0029] In this invention, the preferred mass ratio of the self-preservative system to the natural polysaccharide is 60-100:0.5-5; specifically, it can be 60-80:1.2-1.5.

[0030] In this invention, the preferred dissolution temperature for dissolving natural polysaccharides in the self-preservative system is 80-90°C, more preferably 85°C. The dissolution is preferably carried out under stirring conditions, and the stirring time is preferably 30-60 minutes. In a specific embodiment of this invention, it is preferred to first wet the natural polysaccharides with a water-soluble humectant, and then mix the resulting wetted material with water to dissolve it.

[0031] In this invention, the oil preferably includes one or more of vegetable oils, animal oils, mineral oils, and synthetic oils; the mineral oil preferably includes mineral esters; the vegetable oil includes one or more of shea butter, olive oil, and sacha inchi oil; the mass ratio of the oil to the natural polysaccharide is preferably ≤18:1, more preferably 2:1 to 18:1; specifically, when the oil is a mineral ester and the natural polysaccharide is agar, the mass ratio of the mineral ester to agar is preferably 2:1 to 13.3:1; when the oil is olive oil and the natural polysaccharide is agar, the mass ratio of the olive oil to agar is preferably 3:1 to 10:1; when the oil is sacha inchi oil and the natural polysaccharide is agar, the mass ratio of the sacha inchi oil is preferably 3:1 to 10:1. The preferred mass ratio of oil to agar is 2:1 to 18:1; when the oil is shea butter and the natural polysaccharide is agar, the preferred mass ratio of shea butter to agar is 2:1 to 12:1; when the natural polysaccharide is xanthan gum, the preferred mass ratio of oil to xanthan gum is 10:1.2; when the natural polysaccharide is sodium alginate, the preferred mass ratio of oil to sodium alginate is 10:1.5; when the natural polysaccharide is vegan gum, the preferred mass ratio of oil to vegan gum is 10:3; when the natural polysaccharide is senna gum, the preferred mass ratio of oil to senna gum is 10:1.2; when the natural polysaccharide is cassia seed gum, the preferred mass ratio of oil to cassia seed gum is 10:1.5.

[0032] In this invention, the method for fixing oils using the natural polysaccharide solution preferably includes: heating and mixing the natural polysaccharide and oil, followed by cooling to obtain a mixture in which the oil does not precipitate. The heating and mixing preferably includes sequential heating and stirring followed by heating and homogenization; the heating and stirring temperature is preferably 80–90°C, more preferably 85°C; this invention does not have specific requirements for the heating and stirring time, as long as the mixture is uniformly stirred; in a specific embodiment of this invention, the temperature of the natural polysaccharide solution is preferably controlled at 80–90°C, then oil at 80–90°C is added, followed by stirring under heat preservation conditions. The heating and homogenization temperature is preferably 65–70°C, the time is preferably 2–3 minutes, and the homogenization speed is preferably ≥3000 rpm; after the heating and stirring are completed, the temperature is preferably lowered to the heating and homogenization temperature for homogenization; after the heating and homogenization are completed, the temperature is preferably lowered to room temperature under stirring conditions.

[0033] In this invention, the natural polysaccharide solution can form a stable mixture with oils that does not precipitate. The preferred criterion for determining stability and non-precipitation is that the mixture of natural polysaccharide solution and oils is placed at 50°C for 30 days and the oils do not precipitate.

[0034] This invention also provides a method for screening natural polysaccharides with oil-fixing capabilities, comprising the following steps:

[0035] Natural polysaccharides that can dissolve in a self-preservative system were screened to obtain soluble natural polysaccharides; the water activity of the self-preservative system is ≤0.75;

[0036] The soluble natural polysaccharide is dissolved in a self-preservative system to obtain a natural polysaccharide solution;

[0037] The natural polysaccharide solution and oil were heated, mixed, and then cooled to obtain a mixture;

[0038] If the mixture does not release oil under heat preservation conditions, the selected natural polysaccharide has oil-fixing ability.

[0039] This invention first screens for natural polysaccharides that can dissolve in a self-preservative system to obtain soluble natural polysaccharides. In this invention, the water activity of the self-preservative system is ≤0.75; the composition of the self-preservative system is consistent with the above scheme and will not be repeated here; the preferred method for screening natural polysaccharides that can dissolve in the self-preservative system is as follows: the natural polysaccharides are moistened with a water-soluble humectant, the resulting moistened mixture is mixed with water, heated at 80–90°C for 30–60 min, and the dissolution of the natural polysaccharides is observed; the preferred mass ratio of the water-soluble humectant to the natural polysaccharides is 40–60:0.5–5, specifically 50:0.5–5; the preferred mass ratio of the water-soluble humectant to water is 4–6:2–4, specifically 5:3; specifically, the amount of natural polysaccharides added during moistening depends on the viscosity of the natural polysaccharides after moistening, and the criterion is that the mixture of the water-soluble humectant and the natural polysaccharides is a viscous liquid with fluidity at room temperature, or a non-flowing soft paste.

[0040] After obtaining the soluble natural polysaccharide, the present invention dissolves the soluble natural polysaccharide in a self-preservative system to obtain a natural polysaccharide solution. In the present invention, the dissolution temperature is preferably 80-90°C, more preferably 85°C, and the dissolution is preferably carried out under stirring conditions, with the stirring time preferably being 30-60 minutes. In a specific embodiment of the present invention, it is preferable to first wet the natural polysaccharide with a water-soluble humectant, and then mix the resulting wetted material with water for dissolution. The mass ratio of the water-soluble humectant to the natural polysaccharide and the mass ratio of the water-soluble humectant to water are the same as those used in the screening of soluble natural polysaccharides, and will not be repeated here.

[0041] After obtaining the natural polysaccharide solution, the present invention heats and mixes the natural polysaccharide solution with oil, then cools it to obtain a mixture. In the present invention, the heating and mixing preferably includes sequential heating and stirring followed by heating and homogenization; the heating and stirring temperature is preferably 80–90°C, more preferably 85°C; the present invention does not have special requirements for the heating and stirring time, as long as the mixture is homogenized; in a specific embodiment of the present invention, the temperature of the natural polysaccharide solution is preferably controlled at 80–90°C, then oil at 80–90°C is added, followed by stirring under heat preservation conditions. The heating and homogenization temperature is preferably 65–70°C, the time is preferably 2–3 minutes, and the homogenization speed is preferably ≥3000 rpm; after the heating and stirring are completed, the temperature is preferably lowered to the heating and homogenization temperature for homogenization; after the heating and homogenization are completed, the temperature is preferably lowered to room temperature under stirring conditions.

[0042] After obtaining the mixture, the present invention observes the mixture under heat preservation conditions. If the mixture does not precipitate oil under heat preservation conditions, the screened natural polysaccharide has oil-fixing ability. In the present invention, the temperature of the heat preservation conditions is preferably 50°C; in a specific embodiment of the present invention, the observation time is preferably 30 days. Based on experience, a system that is stable for more than 30 days with oil fixation at 50°C can usually be stable for more than one year at room temperature.

[0043] The present invention also provides an emulsifier-free solid-oil composition comprising the following components in parts by weight: 60-100 parts of a self-preservative system and 0.5-5 parts of natural polysaccharides.

[0044] In this invention, 1 part is preferably 1g.

[0045] By weight, the emulsifier-free solid-oil composition comprises 60-100 parts of a self-preservative system, specifically 80 or 85 parts. In this invention, the self-preservative system preferably comprises a water-soluble humectant and water. Specifically, the water-soluble humectant in the solid-oil composition is preferably 40-60 parts by weight, specifically 50 or 55 parts, and the water is preferably 20-40 parts by weight, specifically 30 parts. The type of water-soluble humectant is the same as in the above scheme and will not be repeated here.

[0046] Based on the mass fractions of the self-preservative system, the emulsifier-free solid-oil composition provided by this invention comprises 0.5 to 5 parts of natural polysaccharides, which in the examples can be 0.5 parts, 0.8 parts, 1 part, 1.5 parts, 1.2 parts, 1.3 parts, 1.8 parts, 2 parts, 2.5 parts, 3 parts, or 3.5 parts. The types of natural polysaccharides are the same as those in the above scheme and will not be repeated here.

[0047] The emulsifier-free solid-oil composition provided by the present invention can effectively fix oils and fats under emulsifier-free conditions.

[0048] The present invention also provides an emulsifier-free oil composition comprising oil and the solid oil composition described above. In the present invention, the emulsifier-free oil composition preferably comprises the following components in parts by weight: 60-100 parts of a self-preservative system, 0.5-5 parts of natural polysaccharides, and 1-50 parts of oil; the composition and preferred range of the self-preservative system are consistent with those in the above-described emulsifier-free solid oil composition, and will not be repeated here; the specific types and preferred range of the natural polysaccharides are consistent with those in the above-described emulsifier-free solid oil composition, and will not be repeated here.

[0049] In this invention, the emulsifier-free oil composition comprises 1 to 50 parts of oil, specifically 1, 3, 5, 10, 15, 20, 25, 30, 40, or 50 parts; the oil preferably includes one or more of vegetable oils, animal oils, mineral oils, and synthetic oils; the specific types of vegetable and mineral oils are consistent with the above scheme and will not be repeated here; the mass ratio of natural polysaccharides in the oil and solid oil composition is preferably ≤18:1. The emulsifier-free oil composition provided by this invention can maintain the stability of the oil without precipitation without adding emulsifiers, and can still maintain the stability of the oil after being kept at 50°C for 30 days, avoiding oil precipitation, and can achieve a long-term stable oil fixation effect.

[0050] The present invention also provides the application of the emulsifier-free solid-oil composition or the emulsifier-free oil composition described above in cosmetics, care products, or ointments. In this invention, the care products preferably include human care products or animal care products, and the human care products preferably include skin care products or medicated toothpaste.

[0051] To further illustrate the present invention, the technical solutions provided by the present invention will be described in detail below with reference to the embodiments, but they should not be construed as limiting the scope of protection of the present invention.

[0052] In the following examples, "parts" refers to "parts by mass", and 1 part by mass is 1g.

[0053] Example 1

[0054] (1) Screening natural polysaccharides that can be dissolved in the self-preservative system

[0055] In this embodiment, water-soluble glycerol is used as the substance to control water activity. The amount of glycerol used is 50 parts. A certain amount of solid natural polysaccharide is moistened with glycerol (the amount of natural polysaccharide added is 1 to 5 parts, and the specific amount depends on the viscosity of the natural polysaccharide after moistening. The criterion is that the mixture of glycerol and natural polysaccharide is a viscous liquid with a certain degree of fluidity at room temperature, or a soft paste that does not flow). Then, 30 parts of water are added and mixed. The mixture is heated to 85°C and stirred for 60 minutes until homogeneous. Soluble natural polysaccharides are screened by whether they dissolve in this self-preservative system.

[0056] Using the above method: from natural polysaccharides such as xanthan gum, guar gum, locust bean gum, carrageenan, pectin, gum arabic, agar, sodium alginate, locust bean gum, carrageenan gum, saponin gum, konjac gum, tamarind gum, psyllium husk gum, plantain gum, ramie gum, okra gum, artemisia gum, astragalus gum, cassia seed gum, gellan gum, ark sylvestris gum, kudzu root powder, flaxseed gum, abelmoschus gum, saffron gum, gentian gum, vetiver gum, fenugreek gum, etc., natural polysaccharides that can dissolve in the self-preservative system are screened out, namely agar, xanthan gum, sodium alginate, pectin, cassia seed gum, saffron gum, gentian gum, and vetiver gum. Then, the next step of solid-oil stability test is carried out.

[0057] (2) Solid oil stability test

[0058] The formula for the natural polysaccharide solution in the solid-oil stability experiment is: 50 parts glycerol, 30 parts water, and 1.2 to 2 parts natural polysaccharide. The types and specific mass fractions of natural polysaccharides are shown in Table 1.

[0059] The specific experimental method is as follows:

[0060] Add natural polysaccharides to glycerol and stir to disperse evenly. Then add water and stir. Heat to 85°C and continue stirring for 60 minutes until completely dissolved. Then add oil at 85°C and stir evenly. Then cool down to 70°C and homogenize for 3 minutes. Continue stirring and cool down to room temperature. The specific amount of oil added is shown in Table 1.

[0061] After being dispensed, the product is placed in a 50℃ incubator to observe the oil-solidification effect (i.e., whether oil separates out).

[0062] Solid-oil stability was assessed by observing the oil at 50℃ for 30 days, indicated by a "+" sign. Stability was assessed by a "-" sign for stability in less than 30 days. Based on experience, systems where oils are fixed at 50℃ for more than 30 days typically maintain solid-oil stability for over a year at room temperature. Specific test results are shown in Table 1.

[0063] Table 1 Results of Solid Oil Stability Test

[0064]

[0065] Table 1 shows that, under the conditions of 1.2–2 parts natural polysaccharide and 10–20 parts oil, and incubation at 50℃ for 30 days, the natural polysaccharides that simultaneously fix mineral esters, shea butter, olive oil, and sacha inchi oil are agar and xanthan gum. The natural polysaccharides that simultaneously fix mineral esters and sacha inchi oil are sodium alginate and cassia gum. The natural polysaccharides that fix sacha inchi oil are vegan gum and sanshin gum.

[0066] Example 2: Stability test of mineral esters immobilized in agar solution

[0067] Agar solution formula: 50 parts glycerol, 30 parts water, 0.5 to 3 parts agar, wherein the specific mass fractions of agar are shown in Table 2.

[0068] The test method includes the following steps:

[0069] Add agar to glycerol and stir to disperse evenly. Then add water and stir. Heat to 85°C and continue stirring for 60 minutes until completely dissolved. Then add mineral ester (1-40 parts, specific dosage as shown in Table 2) at 85°C and stir evenly. Then cool to 70°C and homogenize for 3 minutes. Continue stirring and cool to room temperature.

[0070] After being dispensed, the product is placed in a 50℃ incubator to observe the oil-solidification effect (i.e., whether oil separates out).

[0071] The solid-oil stability was determined by observing the temperature at 50℃ for 30 days, which was marked as "+". A stability of less than 30 days was considered unsatisfactory, marked as "-". The test results are shown in Table 2.

[0072] Table 2. Results of stability tests on mineral esters immobilized in agar solution.

[0073]

[0074] As shown in Table 2, under the conditions of 0.5 to 3.0 parts by mass of agar and 1 to 40 parts by mass of mineral ester, and the test condition of "insulating at 50℃ for 30 days", the mass ratios of agar and mineral ester when the mineral ester is stable are 1:2, 1:6.25, 1:13.3, 1:12, and 1:10, respectively. The highest mass ratio of agar to mineral ester with fixed mineral ester is 1:13.3.

[0075] Example 3: Stability test of olive oil fixed in agar solution

[0076] Agar solution formula: 50 parts glycerol, 30 parts water, 0.5 to 3 parts agar, wherein the specific mass fractions of agar are shown in Table 3.

[0077] The test method includes the following steps:

[0078] Add agar to glycerin and stir to disperse evenly. Then add water and stir. Heat to 85°C and continue stirring for 60 minutes until completely dissolved. Then add olive oil at 85°C (1-30 parts, specific amounts are shown in Table 3) and stir evenly. Then cool to 70°C and homogenize for 3 minutes. Continue stirring and cool to room temperature.

[0079] After being dispensed, the product is placed in a 50℃ incubator to observe the oil-solidification effect (i.e., whether oil separates out).

[0080] The solid-oil stability was determined by observing the product at 50℃ for 30 days, which was indicated by the symbol "+". A stability of less than 30 days was considered unsatisfactory, indicated by the symbol "-". The test results are shown in Table 3.

[0081] Table 3. Results of stability tests on olive oil fixed in agar solution.

[0082]

[0083] As shown in Table 3, under the conditions of 0.5 to 3 parts by mass of agar and 1 to 30 parts by mass of olive oil, and the test condition of "insulating at 50℃ for 30 days", the mass ratios of agar and olive oil when the olive oil is stable are 1:3, 1:6.66, 1:10, and 1:10, respectively. The highest mass ratio of agar to olive oil for fixing olive oil is 1:10.

[0084] Example 4: Stability test of Sacha inchi oil fixed in agar solution

[0085] Agar solution formula: 50 parts glycerol, 30 parts water, 0.5 to 3.5 parts agar, wherein the specific mass fractions of agar are shown in Table 4.

[0086] The test method includes the following steps:

[0087] Add agar to glycerin and stir to disperse evenly. Then add water and stir. Heat to 85°C and continue stirring for 60 minutes until completely dissolved. Then add sacha inchi oil (1-50 parts, specific amounts are shown in Table 4) at 85°C and stir evenly. Then cool to 70°C and homogenize for 3 minutes. Continue stirring and cool to room temperature.

[0088] After being dispensed, the product is placed in a 50℃ incubator to observe the oil-solidification effect (i.e., whether oil separates out).

[0089] The solid-oil stability was determined by observing the temperature at 50℃ for 30 days, which was marked as "+". A stability of less than 30 days was considered unsatisfactory, marked as "-". The test results are shown in Table 4.

[0090] Table 4. Results of stability tests on Safflower oil fixed in agar solution.

[0091]

[0092]

[0093] Table 4 shows that under the conditions of 0.5 to 3.5 parts by weight of agar and 1 to 50 parts by weight of sacha inchi oil, and the test condition of "insulating at 50℃ for 30 days", the mass ratios of agar and sacha inchi oil when the sacha inchi oil is stable are 1:2, 1:5, 1:13.3, 1:15, 1:18, and 1:15, respectively; the highest mass ratio of agar to sacha inchi oil that fixes sacha inchi oil is 1:18.

[0094] Example 5: Stability test of shea butter fixed in agar solution

[0095] Agar solution formula: 50 parts glycerol, 30 parts water, 0.5 to 3 parts agar, wherein the specific mass fractions of agar are shown in Table 5.

[0096] The test method includes the following steps:

[0097] Add agar to glycerin and stir to disperse evenly. Then add water and stir. Heat to 85°C and continue stirring for 60 minutes until completely dissolved. Then add shea butter (1-40 parts, specific amounts are shown in Table 5) at 85°C and stir evenly. Then cool to 70°C and homogenize for 3 minutes. Continue stirring and cool to room temperature.

[0098] After being dispensed, the product is placed in a 50℃ incubator to observe the oil-solidification effect (i.e., whether oil separates out).

[0099] The solid-oil stability was determined by observing the product at 50℃ for 30 days, which was marked as "+". A stability of less than 30 days was considered unsatisfactory, marked as "-". The test results are shown in Table 5.

[0100] Table 5. Stability test of shea butter fixed in agar solution.

[0101]

[0102] As shown in Table 5, under the conditions of 0.5 to 3 parts by mass of agar and 1 to 40 parts by mass of shea butter, and the test condition of "insulating at 50℃ for 30 days", the mass ratios of agar and shea butter when shea butter is stable are 1:2, 1:5, 1:10, 1:10, 1:10, and 1:12, respectively. The highest mass ratio of agar to shea butter for fixing shea butter is 1:12.

[0103] Example 6: Stability test of mineral esters fixed in agar solution (using glycerol and sorbitol as humectants).

[0104] Agar solution formula: 40 parts glycerol, 15 parts sorbitol, 30 parts water, 1-3 parts agar, wherein the specific mass fractions of agar are shown in Table 5.

[0105] The test method includes the following steps:

[0106] Add agar to glycerol and sorbitol and stir to disperse evenly. Then add water and stir. Heat to 85°C and continue stirring for 60 minutes until completely dissolved. Then add mineral ester (1-40 parts, specific dosage as shown in Table 6) at 85°C and stir evenly. Then cool to 70°C and homogenize for 3 minutes. Continue stirring and cooling to room temperature.

[0107] After being dispensed, the product is placed in a 50℃ incubator to observe the oil-solidification effect (i.e., whether oil separates out).

[0108] The solid-oil stability was determined by observing the temperature at 50℃ for 30 days, which was marked as "+". Stability was deemed unsatisfactory if the observation period was less than 30 days, marked as "-". The test results are shown in Table 6.

[0109] Table 6. Stability test results of mineral esters immobilized in agar solution

[0110]

[0111] As shown in Table 6, under the conditions of 40 parts glycerol, 15 parts sorbitol, 1-3 parts agar, and 5-40 parts mineral ester, and the test condition of "insulating at 50℃ for 30 days", the mass ratios of agar and mineral ester when the mineral ester is stable are 1:5, 1:10, 1:10, 1:10, and 1:10, respectively. The mass ratio of agar to mineral ester with the highest fixed mineral ester is 1:10.

[0112] Example 7: Stability test of shea butter fixed in agar solution (using glycerin and betaine as humectants).

[0113] Agar solution formula: 45 parts glycerol, 5 parts betaine, 30 parts water, 1-3 parts agar, wherein the specific mass fractions of agar are shown in Table 7.

[0114] The test method includes the following steps:

[0115] Add agar to glycerin and betaine and stir to disperse evenly. Then add water and stir. Heat to 85°C and continue stirring for 60 minutes until completely dissolved. Then add shea butter (5-30 parts, specific amounts are shown in Table 7) at 85°C and stir evenly. Then cool to 70°C and homogenize for 3 minutes. Continue stirring and cool to room temperature.

[0116] After being dispensed, the product is placed in a 50℃ incubator to observe the oil-solidification effect (i.e., whether oil separates out).

[0117] The solid-oil stability was determined by observing the temperature at 50℃ for 30 days, which was marked as "+". Stability was deemed unsatisfactory if the observation period was less than 30 days, marked as "-". The test results are shown in Table 7.

[0118] Table 7. Results of stability tests on shea butter fixed in agar solution.

[0119]

[0120] As shown in Table 7, under the conditions of 45 parts glycerol, 5 parts betaine, 1-3 parts agar, and 5-30 parts shea butter, and the test condition of "insulating at 50℃ for 30 days", the mass ratios of agar and shea butter when shea butter is stable are 1:5, 1:6.67, 1:7.5, 1:8, 1:10, and 1:8.33, respectively. The highest mass ratio of agar to shea butter for fixing shea butter is 1:10.

[0121] The experiments summarized in Tables 2-7 above show that the solution prepared by adding natural polysaccharides to the self-preservative system has a good ability to fix oils and fats. It can effectively fix oils and fats such as mineral esters, sacha inchi oil, olive oil, and shea butter, and the oils and fats remain stable for more than a month in a 50℃ incubator without separation.

[0122] Example 8: Stability test of various oils immobilized with xanthan gum solution

[0123] Xanthan gum solution formula: 50 parts glycerin, 30 parts water, 1.2 parts xanthan gum.

[0124] The test method includes the following steps:

[0125] Add xanthan gum to glycerin and stir to disperse evenly. Then add water and stir. Heat to 85°C and continue stirring for 60 minutes until completely dissolved. Then add 10 parts of oil at 85°C (the types of oil are shown in Table 8) and stir evenly. Then cool to 70°C and homogenize for 3 minutes. Continue stirring and cooling to room temperature.

[0126] After being dispensed, the product is placed in a 50℃ incubator to observe the oil-solidification effect (i.e., whether oil separates out).

[0127] The solid-oil stability was determined by observing the temperature at 50℃ for 30 days, which was marked as "+". A stability of less than 30 days was considered unsatisfactory, marked as "-". The test results are shown in Table 8.

[0128] Table 8. Stability test results of various oils fixed with xanthan gum solution.

[0129]

[0130]

[0131] As shown in Table 8, when xanthan gum is dissolved in a self-preservative system, the resulting xanthan gum solution can effectively fix mineral esters, shea butter, and sacha inchi oil.

[0132] Example 9: Stability test of various oils immobilized by sodium alginate solution

[0133] Sodium alginate solution formula: 50 parts glycerin, 30 parts water, 1.5 parts sodium alginate.

[0134] The test method includes the following steps:

[0135] Add sodium alginate to glycerin and stir to disperse evenly. Then add water and stir. Heat to 85°C and continue stirring for 60 minutes until completely dissolved. Then add 10 parts of oil at 85°C (the types of oil are shown in Table 9) and stir evenly. Then cool to 70°C and homogenize for 3 minutes. Continue stirring and cooling to room temperature.

[0136] After being dispensed, the product is placed in a 50℃ incubator to observe the oil-solidification effect (i.e., whether oil separates out).

[0137] The solid-oil stability was determined by observing the temperature at 50℃ for 30 days, which was marked as "+". Stability was deemed unsatisfactory if the temperature was lowered by "-". The test results are shown in Table 9.

[0138] Table 9. Stability results of various oils immobilized by sodium alginate solution.

[0139]

[0140] As shown in Table 9, when sodium alginate is dissolved in the self-preservative system, the resulting sodium alginate solution can effectively fix mineral esters, shea butter, and sacha inchi oil.

[0141] Example 10: Stability test of various oils immobilized by venetum gum solution

[0142] Vegan gum solution formula: 50 parts glycerin, 30 parts water, 3 parts vegan gum.

[0143] The test method includes the following steps:

[0144] Add vegan gum to glycerin and stir to disperse evenly. Then add water and stir. Heat to 85°C and continue stirring for 60 minutes until completely dissolved. Then add 10 parts of oil at 85°C (the types of oil are shown in Table 10) and stir evenly. Then cool to 70°C and homogenize for 3 minutes. Continue stirring and cool to room temperature.

[0145] After being dispensed, the product is placed in a 50℃ incubator to observe the oil-solidification effect (i.e., whether oil separates out).

[0146] The solid-oil stability was determined by observing the temperature at 50℃ for 30 days, which was marked as "+". A stability of less than 30 days was considered unsatisfactory, marked as "-". The test results are shown in Table 10.

[0147] Table 10. Stability test results of various oils immobilized with Vilan gum solution.

[0148]

[0149] As shown in Table 10, when vegan gum is dissolved in a self-preservative system, the resulting vegan gum solution can effectively fix mineral esters, shea butter, and sacha inchi oil.

[0150] Example 11: Stability test of various oils immobilized by trisaccharide solution

[0151] Three Immortals Glue Solution Formula: 50 parts glycerin, 30 parts water, 1.2 parts three immortals glue.

[0152] The test method includes the following steps:

[0153] Add the three-in-one gum to the glycerin and stir to disperse evenly. Then add water and stir. Heat to 85°C and continue stirring for 60 minutes until completely dissolved. Then add 10 parts of oil at 85°C (the types of oil are shown in Table 11) and stir evenly. Then cool down to 70°C and homogenize for 3 minutes. Continue stirring and cooling down to room temperature.

[0154] After being dispensed, the product is placed in a 50℃ incubator to observe the oil-solidification effect (i.e., whether oil separates out).

[0155] The solid-oil stability was determined by observing the temperature at 50℃ for 30 days, which was marked as "+". A stability of less than 30 days was considered unsatisfactory, marked as "-". The test results are shown in Table 11.

[0156] Table 11 Test results of the oil and fat composition provided in Example 11

[0157]

[0158] As shown in Table 11, when Sanxian gum is dissolved in a self-preservative system, the resulting Sanxian gum solution can effectively fix mineral esters, shea butter, and sacha inchi oil.

[0159] Example 12: Stability test of various oils immobilized by cassia seed gum solution

[0160] Formula for cassia seed gum solution: 50 parts glycerin, 30 parts water, 1.5 parts cassia seed gum.

[0161] The test method includes the following steps:

[0162] Add cassia seed gum to glycerin and stir to disperse evenly. Then add water and stir. Heat to 85°C and continue stirring for 60 minutes until completely dissolved. Then add 10 parts of oil at 85°C (the types of oil are shown in Table 12) and stir evenly. Then cool to 70°C and homogenize for 3 minutes. Continue stirring and cooling to room temperature.

[0163] After being dispensed, the product is placed in a 50℃ incubator to observe the oil-solidification effect (i.e., whether oil separates out).

[0164] The solid-oil stability was determined by observing the temperature at 50℃ for 30 days, which was indicated by the symbol "+". A stability of less than 30 days was considered unsatisfactory, indicated by the symbol "-". The test results are shown in Table 12.

[0165] Table 12. Stability results of various oils fixed by cassia seed gum solution.

[0166]

[0167] As shown in Table 12, when cassia seed gum is dissolved in a self-preservative system, the resulting cassia seed gum solution can effectively fix mineral esters, shea butter, and sacha inchi oil.

[0168] The experimental results summarized in Tables 1-12 indicate that in the self-preservative system, agar, xanthan gum, sodium alginate, cassia seed gum, vetiver gum, and sanxian gum all have the ability to fix oils such as mineral esters, shea butter, and sacha inchi oil. However, agar has the strongest ability to fix oils, and the highest mass ratio of oil to agar is 18:1.

[0169] As can be seen from the above embodiments, the present invention dissolves natural polysaccharides in a self-preservative system, and the resulting natural polysaccharide solution can replace emulsifiers to fix oils. Under the condition of not using emulsifiers, long-term stable fixation of oils is achieved, avoiding oil precipitation, thereby solving the problem that emulsifiers in care products, cosmetics or ointments can easily cause sebum loss and dry skin.

[0170] Although the above embodiments have provided a detailed description of the present invention, they are only some embodiments of the present invention, and not all embodiments. Other embodiments can be obtained based on these embodiments without creative effort, and these embodiments all fall within the protection scope of the present invention.

Claims

1. A method for immobilizing oils without emulsifiers based on natural polysaccharides, characterized in that, Natural polysaccharides are dissolved in a self-preservative system to obtain a natural polysaccharide solution; The oil is fixed using the natural polysaccharide solution; the water activity of the self-preservative system is ≤0.75; and the oil does not precipitate out in the mixture formed by the natural polysaccharide solution and the oil.

2. The emulsifier-free grease fixation method according to claim 1, characterized in that, The self-preservative system comprises water and a water-soluble humectant; the water-soluble humectant comprises one or more of polyols and betaine.

3. The emulsifier-free grease fixation method according to claim 1, characterized in that, The molecular weight of the natural polysaccharide is 2,000 to 10,000,000 Daltons; the natural polysaccharide includes one or more of agar, xanthan gum, sodium alginate, cassia seed gum, sanxian gum, and vegan gum; the mass ratio of the self-preservative system to the natural polysaccharide is 60 to 100: 0.5 to 5.

4. The emulsifier-free grease fixation method according to claim 1, characterized in that, The oils include one or more of vegetable oils, animal oils, mineral oils, and synthetic oils; the mass ratio of the oils to the natural polysaccharides is ≤18:

1.

5. The emulsifier-free grease fixation method according to claim 4, characterized in that, The mineral oils include mineral esters; the vegetable oils include one or more of shea butter, olive oil, and sacha inchi oil.

6. A method for screening natural polysaccharides with oil-fixing ability, characterized in that, Includes the following steps: Natural polysaccharides that can dissolve in a self-preservative system were screened to obtain soluble natural polysaccharides; the water activity of the self-preservative system is ≤0.75; The soluble natural polysaccharide is dissolved in a self-preservative system to obtain a natural polysaccharide solution; The natural polysaccharide solution and oil were heated, mixed, and then cooled to obtain a mixture; If the mixture does not release oil under heat preservation conditions, the selected natural polysaccharide has oil-fixing ability.

7. The screening method according to claim 6, characterized in that, The heating and mixing process includes sequential heating and stirring and heating and homogenizing; the heating and stirring temperature is 80-90°C; the heating and homogenizing temperature is 65-70°C, and the time is 2-3 minutes.

8. A solid-oil composition without emulsifier, characterized in that, It includes the following components in parts by weight: 60-100 parts of self-preservative system and 0.5-5 parts of natural polysaccharide.

9. An emulsifier-free oil composition comprising oil and the solid oil composition of claim 8.

10. The use of the emulsifier-free solid-oil composition of claim 8 or the emulsifier-free oil composition of claim 9 in the preparation of cosmetics, care products or ointments.

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