Moisturizing cosmetic additive and preparation method thereof

Abstract

The invention discloses a moisturizing cosmetic additive and a preparation method thereof, belongs to the technical field of cosmetics, and is used for solving the technical problem of how to improve the oxidation resistance of a polysaccharide extract because a moisturizing cosmetic added with the polysaccharide extract in the prior art is easy to inactivate in an external environment. The preparation method of the moisturizing cosmetic additive comprises the following steps: adding tetrabutylammonium bromide, modified Chinese yam polysaccharide and carboxymethyl polysaccharide into a sodium hyaluronate solution, and reacting at 45-65 DEG C for 20-24 hours to obtain a product; and dialyzing the product, and freeze-drying to obtain powder, namely the prepared moisturizing cosmetic additive. The Chinese yam polysaccharide is modified by sulfuric acid, so that the antioxidant activity of the Chinese yam polysaccharide can be enhanced. Astragalus polysaccharide and chloroacetic acid are synthesized into carboxymethyl polysaccharide under an alkaline condition. Tetrabutylammonium bromide is used as a bridging agent, and the sodium hyaluronate coated Chinese yam polysaccharide extract and carboxymethyl polysaccharide are obtained through physical electrostatic adsorption and chemical reaction.

Description

Technical Field

[0001] This invention relates to the field of cosmetic technology, specifically to a moisturizing cosmetic additive and its preparation method. Background Technology

[0002] Polysaccharides are polar biological macromolecules that are readily soluble in water but poorly soluble in ethanol. They possess pharmacological activities such as antioxidant, moisturizing, immunomodulatory, hypoglycemic, and antitumor effects, and can be applied in moisturizing cosmetics. Patent application CN103536455A discloses the application of a compound fungal polysaccharide in the preparation of moisturizing cosmetics. Lentinan from shiitake mushrooms and polysaccharides from tremella mushrooms are extracted using a water extraction and ethanol precipitation method. The combination of shiitake and tremella polysaccharides can be used as an additive in moisturizing cosmetics. However, polysaccharide extracts are easily inactivated under external environments; furthermore, improving the antioxidant and moisturizing properties of polysaccharide extracts is a technical problem that urgently needs to be solved.

[0003] To address this technical deficiency, a solution is proposed. Summary of the Invention

[0004] The purpose of this invention is to provide a moisturizing cosmetic additive and its preparation method, which solves the technical problems of existing moisturizing cosmetics containing polysaccharide extracts being easily deactivated under external environment and how to improve the antioxidant properties of polysaccharide extracts.

[0005] The objective of this invention can be achieved through the following technical solutions: A method for preparing a moisturizing cosmetic additive includes the following steps: S1. Tetrabutylammonium bromide, modified yam polysaccharide, and carboxymethyl polysaccharide were added to sodium hyaluronate solution and reacted at 45-65℃ for 20-24 h to obtain the product. S2. The product is dialyzed and freeze-dried into powder, which is the prepared moisturizing cosmetic additive.

[0006] Further, in step S1, the method for preparing the modified yam polysaccharide includes the following steps: A1. Add yam powder to sodium chloride solution, heat to react, let stand, discard the supernatant and collect the yam precipitate; add α-amylase and cellulase to deionized water to form a mixture; add the yam precipitate to the mixture, react, let stand, centrifuge and separate, and collect the secondary supernatant and secondary precipitate respectively. A2. The secondary supernatant, concentrated sulfuric acid, n-butanol and ammonium sulfate were mixed to obtain a reaction system; the reaction system was reacted at 2-5℃ for 1-2 hours to obtain the reactant; the pH of the reactant was adjusted to neutral, and centrifuged to obtain sulfated modified yam polysaccharide; the sulfated modified yam polysaccharide was dialyzed using a dialysis bag and freeze-dried into powder, which is the prepared modified yam polysaccharide.

[0007] Further, in step A1, the ratio of yam powder to sodium chloride solution is 10-20g:300-500mL, the reaction temperature is 65-75℃, and the reaction time is 10-12h; the ratio of α-amylase, cellulase, and deionized water is 0.25-0.5g:0.5-1g:100mL, and the ratio of yam precipitate to mixed solution is 5-10g:100mL; the reaction temperature is 40-50℃, and the reaction time is 10-12h.

[0008] Furthermore, in step A2, the ratio of secondary supernatant, concentrated sulfuric acid, n-butanol, and ammonium sulfate is 0.5-1 mL: 10-15 mL: 5-10 mL: 0.1-0.12 g, the molecular weight cutoff of the dialysis bag is 4800-5000 Da, the freeze-drying temperature is -30 to -50 °C, and the freeze-drying time is 3-4 h.

[0009] Furthermore, the method for preparing the carboxymethyl polysaccharide includes the following steps: B1. Adjust the pH of the deionized water to 8-9, then add astragalus polysaccharide and chloroacetic acid to the deionized water, stir to dissolve at 50-60℃, and then cool naturally to room temperature to synthesize the product. When Astragalus polysaccharides dissolve in an alkaline solvent, they become Astragalus polysaccharide anions under the influence of hydroxide ions. These anions attack the partially positively charged carbon atoms on chloroacetic acid, undergoing a bimolecular nucleophilic substitution reaction to form carboxymethyl polysaccharides.

[0010] B2. Adjust the pH of the product to neutral, then add ethanol for precipitation, centrifuge to obtain the precipitate; dialyze the precipitate using a dialysis bag, freeze-dry it into powder, and synthesize carboxymethyl polysaccharide.

[0011] Furthermore, in step B1, the ratio of deionized water, astragalus polysaccharide, and chloroacetic acid is 50-60 mL: 2-5 g: 1.5-2 g; in step B2, the molecular weight cutoff of the dialysis bag is 30-50 kDa.

[0012] Further, in step S1, the concentration of the sodium hyaluronate solution is 1-2 g / L; the ratio of sodium hyaluronate solution, tetrabutylammonium bromide, modified yam polysaccharide and carboxymethyl polysaccharide is 20-30 mL: 0.5-1 g: 3-10 g: 3-10 g.

[0013] As another aspect of the present invention, a method for preparing a moisturizing cosmetic additive provides a moisturizing cosmetic additive.

[0014] The present invention has the following beneficial effects: 1. Yam powder is first added to a sodium chloride solution, causing starch salting out, resulting in starch granules agglomerating and precipitating. The yam precipitate is collected. This precipitate is then enzymatically hydrolyzed and precipitated with alcohol using a mixture of α-amylase and cellulase, yielding a secondary supernatant rich in yam polysaccharides. This secondary supernatant is acidified with sulfuric acid and then dialyzed using a dialysis bag with a specific molecular weight cutoff, ultimately yielding high-purity modified yam polysaccharides. The sulfuric acid modification not only enhances the antioxidant activity of the modified yam polysaccharides but also further improves their purity through dialysis using a dialysis bag with a specific molecular weight cutoff.

[0015] 2. Astragalus polysaccharides and chloroacetic acid are synthesized into carboxymethyl polysaccharides under alkaline conditions. Carboxymethylation of astragalus polysaccharides significantly improves their water solubility. The modified yam polysaccharides and astragalus polysaccharides are mixed and reacted with a sodium hyaluronate solution, using tetrabutylammonium bromide as a bridging agent. Through physical electrostatic adsorption and chemical reaction, yam polysaccharide extract and carboxymethyl polysaccharides coated on a sodium hyaluronate substrate are obtained. The products are then dialyzed again to remove impurities and freeze-dried into powder to prepare a moisturizing cosmetic additive with moisturizing and antioxidant effects. Detailed Implementation

[0016] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0017] The yam used in Examples 1-3 of this invention was purchased from Qinyang Zhongde Huaiyao Co., Ltd.; the α-amylase and cellulase used in Examples 1-3 of this invention were both purchased from Nanning Dongheng Huadao Biotechnology Co., Ltd., with the α-amylase having a fineness of 60 mesh and the cellulase having an enzyme activity of 10,000-20,000 U / G; the astragalus polysaccharide used in Examples 4-6 of this invention was purchased from Xi'an Tianguangyuan Biotechnology Co., Ltd., with a product mesh size of 80 mesh; the PBS buffer solution used in Examples 7-9 of this invention was purchased from Xiamen Haibiao Technology Co., Ltd., with the product number 2025060402.

[0018] Example 1 This embodiment provides a method for preparing modified yam polysaccharide used as an additive in moisturizing cosmetics, including the following steps: A1. Grind the yam into powder using a grinder to obtain 500-mesh yam powder. Add 10g of yam powder to 300mL of 0.5%wt sodium chloride solution and heat at 65℃ with mechanical stirring at 100r / min for 10h. Then let it stand for 10h, discard the supernatant, and collect the yam precipitate. Add 0.25g of α-amylase and 0.5g of cellulase to 100mL of deionized water to form a mixture. Then add 5g of yam precipitate to 100mL of the mixture and react at 40℃ for 10h. Let it stand for 10h, then centrifuge at 3000r / min for 5min. Collect the secondary supernatant and secondary precipitate separately.

[0019] A2. Add 0.5 mL of the secondary supernatant, 10 mL of 95% wt concentrated sulfuric acid, and 5 mL of n-butanol to a three-necked flask. Then add 0.1 g of ammonium sulfate to the three-necked flask to obtain the reaction system. Transfer the reaction system to a water bath and react at 5 °C for 1 h to obtain the reactant. Add 0.1 mol / L NaOH solution dropwise to adjust the pH of the reactant to neutral, and then centrifuge at 3000 r / min for 10 min to obtain sulfated yam polysaccharide. Dialyze the sulfated yam polysaccharide using a dialysis bag with a molecular weight cutoff of 5000 Da, freeze-dry it into powder at -50 °C for 3 h to prepare the modified yam polysaccharide.

[0020] Example 2 This embodiment provides a method for preparing modified yam polysaccharide used as an additive in moisturizing cosmetics, including the following steps: A1. Grind the yam into powder using a grinder to obtain 550-mesh yam powder. Add 15g of yam powder to 400mL of 0.8%wt sodium chloride solution and heat at 70℃ with mechanical stirring at 130r / min for 11h. Then let it stand for 11h, discard the supernatant, and collect the yam precipitate. Add 0.35g of α-amylase and 0.8g of cellulase to 100mL of deionized water to form a mixture. Then add 8g of yam precipitate to 100mL of the mixture and react at 45℃ for 11h. Let it stand for 11h, then centrifuge at 4000r / min for 8min to form a secondary supernatant and a secondary precipitate.

[0021] A2. Add 0.8 mL of the secondary supernatant, 12 mL of 96% wt concentrated sulfuric acid, and 6 mL of n-butanol to a three-necked flask. Then add 0.11 g of ammonium sulfate to the flask to obtain the reaction system. Transfer the reaction system to a water bath and react at 2℃ for 1.3 h to obtain the reactant. Add 0.1 mol / L NaOH solution dropwise to adjust the pH of the reactant to neutral, then centrifuge at 3300 r / min for 12 min to obtain sulfated yam polysaccharide. Dialyze the sulfated yam polysaccharide using a dialysis bag with a molecular weight cutoff of 4800 Da, then freeze-dry it into powder at -40℃ for 3.5 h to obtain the modified yam polysaccharide.

[0022] Example 3 This embodiment provides a method for preparing modified yam polysaccharide used as an additive in moisturizing cosmetics, including the following steps: A1. Grind the yam in a grinder to obtain 600-mesh yam powder. Add 20g of yam powder to 500mL of 1%wt sodium chloride solution and heat at 75℃ with mechanical stirring at 200r / min for 12h. Then let it stand for 12h, discard the supernatant and collect the yam precipitate. Add 0.5g of α-amylase and 1g of cellulase to 100mL of deionized water to form a mixture. Then add 10g of yam precipitate to 100mL of the mixture and react at 50℃ for 12h. Let it stand for 12h, then centrifuge at 5000r / min for 10min to form a secondary supernatant and a secondary precipitate.

[0023] A2. Add 1 mL of the secondary supernatant, 15 mL of 98% wt concentrated sulfuric acid, and 10 mL of n-butanol to a three-necked flask. Then add 0.12 g of ammonium sulfate to the flask to obtain the reaction system. Transfer the reaction system to a water bath and react at 5℃ for 2 h to obtain the reactant. Add 0.1 mol / L NaOH solution dropwise to adjust the pH of the reactant to neutral, then centrifuge at 4000 r / min for 15 min to obtain sulfated yam polysaccharide. Dialyze the sulfated yam polysaccharide using a dialysis bag with a molecular weight cutoff of 5000 Da, then freeze-dry it into powder at -50℃ for 4 h to prepare the modified yam polysaccharide.

[0024] Example 4 This embodiment provides a method for preparing carboxymethyl polysaccharide for use as an additive in moisturizing cosmetics, including the following steps: B1. Add 50 mL of deionized water to a beaker, add 0.1 mol / L NaOH solution dropwise to the beaker to adjust the pH of the deionized water to 8, then add 2 g of astragalus polysaccharide and 1.5 g of chloroacetic acid to the beaker, stir thoroughly at 50 °C for 3.5 h, and then cool naturally to room temperature to synthesize the product.

[0025] B2. Acetic acid was added dropwise to the product to adjust the pH to neutral, and then ethanol was added for precipitation. The mixture was centrifuged at 3000 r / min for 20 min to obtain the precipitate. The precipitate was dialyzed using a dialysis bag with a molecular weight cutoff of 30 kDa and freeze-dried into powder at -10℃ to synthesize carboxymethyl polysaccharide.

[0026] Example 5 This embodiment provides a method for preparing carboxymethyl polysaccharide for use as an additive in moisturizing cosmetics, including the following steps: B1. Add 55 mL of deionized water to a beaker, add 0.1 mol / L NaOH solution dropwise to the beaker to adjust the pH of the deionized water to 8.5, then add 3 g of astragalus polysaccharide and 1.8 g of chloroacetic acid to the beaker, stir thoroughly at 55 °C for 4.5 h to dissolve, and then let it cool naturally to room temperature to synthesize the product.

[0027] B2. Acetic acid was added dropwise to the product to adjust the pH to neutral, followed by ethanol precipitation. The mixture was centrifuged at 3500 rpm for 25 min to obtain the precipitate. The precipitate was dialyzed using a dialysis bag with a molecular weight cutoff of 40 kDa and freeze-dried into powder at -15°C to synthesize carboxymethyl polysaccharide.

[0028] Example 6 This embodiment provides a method for preparing carboxymethyl polysaccharide for use as an additive in moisturizing cosmetics, including the following steps: B1. Add 60 mL of deionized water to a beaker, add 0.1 mol / L NaOH solution dropwise to the beaker to adjust the pH of the deionized water to 9, then add 5 g of astragalus polysaccharide and 2 g of chloroacetic acid to the beaker, stir thoroughly at 60 °C for 5.5 h to dissolve, and then cool naturally to room temperature to synthesize the product.

[0029] B2. Acetic acid was added dropwise to the product to adjust the pH to neutral, and then ethanol was added for precipitation. The mixture was centrifuged at 4000 r / min for 30 min to obtain the precipitate. The precipitate was dialyzed using a dialysis bag with a molecular weight cutoff of 50 kDa and freeze-dried into powder at -20℃ to synthesize carboxymethyl polysaccharide.

[0030] Example 7 This embodiment provides a method for preparing a moisturizing cosmetic additive, including the following steps: S1. Accurately weigh 0.5 g of sodium hyaluronate using an electronic balance. Add sodium hyaluronate and deionized water to a beaker to prepare a 1 g / L sodium hyaluronate solution. Add 0.5 g of tetrabutylammonium bromide, 3 g of the modified yam polysaccharide prepared in Example 1, and 3 g of the carboxymethyl polysaccharide prepared in Example 4 to 20 mL of the sodium hyaluronate solution. React the mixture at 45 °C for 20 h in a stirrer to obtain the product.

[0031] S2. The product was dialyzed in PBS buffer solution for 24 hours, and then freeze-dried at -10℃ into powder, which is the prepared moisturizing cosmetic additive.

[0032] Example 8 This embodiment provides a method for preparing a moisturizing cosmetic additive, including the following steps: S1. Accurately weigh 0.8 g of sodium hyaluronate using an electronic balance. Add sodium hyaluronate and deionized water to a beaker to prepare a 1.5 g / L sodium hyaluronate solution. Add 0.8 g of tetrabutylammonium bromide, 6 g of the modified yam polysaccharide prepared in Example 2, and 6 g of the carboxymethyl polysaccharide prepared in Example 5 to 22 mL of the sodium hyaluronate solution. React the mixture at 55 °C for 22 h in a stirrer to obtain the product.

[0033] S2. The product was dialyzed in PBS buffer solution for 24 hours, and then freeze-dried at -15℃ into powder, which is the prepared moisturizing cosmetic additive.

[0034] Example 9 This embodiment provides a method for preparing a moisturizing cosmetic additive, including the following steps: S1. Accurately weigh 1g of sodium hyaluronate using an electronic balance. Add sodium hyaluronate and deionized water to a beaker to prepare a 2g / L sodium hyaluronate solution. Add 1g of tetrabutylammonium bromide, 10g of the modified yam polysaccharide prepared in Example 3, and 10g of the carboxymethyl polysaccharide prepared in Example 6 to 30mL of the sodium hyaluronate solution. React in a stirrer at 65°C for 24h to obtain the product.

[0035] S2. The product was dialyzed in PBS buffer solution for 24 hours, and then freeze-dried at -20℃ into powder, which is the prepared moisturizing cosmetic additive.

[0036] Comparative Example 1 The difference between this comparative example and Example 9 is that step A2 is omitted when preparing the modified yam polysaccharide; the secondary supernatant is dialyzed using a dialysis bag with a molecular weight cutoff of 5000 Da, and then freeze-dried into powder at a freeze-drying temperature of -50°C for 4 hours to obtain the modified yam polysaccharide.

[0037] Comparative Example 2 The difference between this comparative example and Example 9 is that the same mass of Astragalus polysaccharide was used instead of carboxymethyl polysaccharide.

[0038] Comparative Example 3 The difference between this comparative example and Example 9 is that tetrabutylammonium bromide was not added during the preparation of the product.

[0039] Performance testing: 1. Preparation of ABTS solution: Prepare 8.1 mmol / L ABTS diamine salt solution and 3.2 mmol / L potassium persulfate solution, mix equal volumes of the two solutions, and react at room temperature in the dark for 15 hours. Dilute 50 times before use to achieve an absorbance of 0.7 at 734 nm. Add the moisturizing cosmetic additives prepared in Examples 7-9 and Comparative Examples 1-3 to deionized water, stir to dissolve, and dilute to a 0.25 mg / ml test solution. Add the test solution to the ABTS solution at a volume ratio of 1:8, shake to mix, react at room temperature for 20 minutes, and measure the absorbance at 734 nm. Replace the test solution with distilled water, and perform the same operations as above; this is recorded as blank A. Calculate the clearance rate using the following formula.

[0040] Clearance rate (%) = (A 空白 -A 样品 / A 空白 ) × 100% 2. Weigh 1g of each of the moisturizing cosmetic additives prepared in Examples 7-9 and Comparative Examples 1-3 into a weighing bottle, and place the weighing bottle in a drying oven; control the ambient temperature at 25℃; prepare 200mL of saturated potassium carbonate solution with a relative humidity of RH 43% to create a constant temperature and humidity environment. After 24 hours, weigh the contents and calculate the moisturizing rate of the prepared moisturizing cosmetic additive.

[0041] Moisturizing rate (%) = M2 / M1 × 100% M1 represents the sample mass of the moisturizing cosmetic additive before placement; M2 represents the sample mass of the moisturizing cosmetic additive after 24 hours of placement.

[0042] Table 1. Sample performance test data Data Analysis: By comparing and analyzing the data in Table 1, the moisturizing cosmetic additives prepared in Examples 7-9 of this invention exhibit high antioxidant and reducing properties, as demonstrated by their high ABTS scavenging rates. However, in Comparative Example 1, the modified yam polysaccharide was not modified with sulfuric acid, resulting in reduced oxidative activity of the prepared moisturizing cosmetic additive, manifested as a lower product scavenging rate. In Comparative Example 2, replacing the prepared carboxymethyl polysaccharide with an equal mass of astragalus polysaccharide reduced the antioxidant activity of the prepared moisturizing cosmetic additive, also resulting in a lower product scavenging rate.

[0043] The moisturizing cosmetic additives prepared in Examples 7-9 of this invention exhibit high moisturizing properties, specifically a high moisturizing rate. However, in Comparative Example 3, tetrabutylammonium bromide was not added during the preparation of the moisturizing cosmetic additive. Tetrabutylammonium bromide, as an ionic compound, can serve as a connecting bridging material for sodium hyaluronate, modified yam polysaccharide, and carboxymethyl polysaccharide; therefore, the moisturizing rate of the moisturizing cosmetic additive prepared in Comparative Example 3 is lower.

[0044] The above description is merely an example and illustration of the structure of the present invention. Those skilled in the art can make various modifications or additions to the specific embodiments described, or use similar methods to replace them, as long as they do not deviate from the structure of the invention or exceed the scope defined in the claims, all of which should fall within the protection scope of the present invention.

[0045] In the description of this specification, references to terms such as "an embodiment," "example," and "specific example" indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

Claims

1. A method for preparing a moisturizing cosmetic additive, characterized in that, Includes the following steps: S1. Tetrabutylammonium bromide, modified yam polysaccharide and carboxymethyl polysaccharide were added to sodium hyaluronate solution and reacted at 45-65℃ for 20-24h to obtain the product; S2. The product is dialyzed and freeze-dried into powder, which is the prepared moisturizing cosmetic additive.

2. The method for preparing a moisturizing cosmetic additive according to claim 1, characterized in that, In step S1, the preparation method of the modified yam polysaccharide includes the following steps: A1. Add yam powder to sodium chloride solution, heat to react, let stand, discard the supernatant and collect the yam precipitate; add α-amylase and cellulase to deionized water to form a mixture; add the yam precipitate to the mixture, react, let stand, centrifuge and separate, and collect the secondary supernatant and secondary precipitate respectively. A2. The secondary supernatant, concentrated sulfuric acid, n-butanol and ammonium sulfate were mixed to obtain a reaction system; the reaction system was reacted at 2-5℃ for 1-2 hours to obtain the reactant; the pH of the reactant was adjusted to neutral, and centrifuged to obtain sulfated modified yam polysaccharide; the sulfated modified yam polysaccharide was dialyzed using a dialysis bag and freeze-dried into powder, which is the prepared modified yam polysaccharide.

3. The method for preparing a moisturizing cosmetic additive according to claim 2, characterized in that, In step A1, the ratio of yam powder to sodium chloride solution is 10-20g:300-500mL, the reaction temperature is 65-75℃, and the reaction time is 10-12h; the ratio of α-amylase, cellulase, and deionized water is 0.25-0.5g:0.5-1g:100mL, and the ratio of yam precipitate to mixed solution is 5-10g:100mL; the reaction temperature is 40-50℃, and the reaction time is 10-12h.

4. The method for preparing a moisturizing cosmetic additive according to claim 2, characterized in that, In step A2, the ratio of secondary supernatant, concentrated sulfuric acid, n-butanol and ammonium sulfate is 0.5-1 mL: 10-15 mL: 5-10 mL: 0.1-0.12 g, the molecular weight cutoff of the dialysis bag is 4800-5000 Da, the freeze-drying temperature is -30 to -50 °C, and the freeze-drying time is 3-4 h.

5. The method for preparing a moisturizing cosmetic additive according to claim 1, characterized in that, The method for preparing the carboxymethyl polysaccharide includes the following steps: B1. Adjust the pH of the deionized water to 8-9, then add astragalus polysaccharide and chloroacetic acid to the deionized water, stir to dissolve at 50-60℃, and then cool naturally to room temperature to synthesize the product. B2. Adjust the pH of the product to neutral, then add ethanol for precipitation, centrifuge to obtain the precipitate; dialyze the precipitate using a dialysis bag, freeze-dry it into powder, and synthesize carboxymethyl polysaccharide.

6. The method for preparing a moisturizing cosmetic additive according to claim 5, characterized in that, In step B1, the ratio of deionized water, astragalus polysaccharide, and chloroacetic acid is 50-60 mL: 2-5 g: 1.5-2 g; in step B2, the molecular weight cutoff of the dialysis bag is 30-50 kDa.

7. The method for preparing a moisturizing cosmetic additive according to claim 1, characterized in that, In step S1, the concentration of sodium hyaluronate solution is 1-2 g / L; the ratio of sodium hyaluronate solution, tetrabutylammonium bromide, modified yam polysaccharide and carboxymethyl polysaccharide is 20-30 mL: 0.5-1 g: 3-10 g: 3-10 g.

8. A moisturizing cosmetic additive, characterized in that, It is prepared using the preparation method of a moisturizing cosmetic additive as described in any one of claims 1-7.

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