Extraction process of leontopodium alpinum extract as well as pH adjusting composition and application of leontopodium alpinum extract

Abstract

The invention belongs to the field of daily chemicals, and particularly relates to an extraction process of a leontopodium alpinum extract, a pH adjusting composition of the leontopodium alpinum extract and application of the pH adjusting composition of the leontopodium alpinum extract, and the pH adjusting composition of the leontopodium alpinum extract comprises the following components in percentage by weight: 0.001-10.0% of the leontopodium alpinum extract; 0.01%-3.0% of organic acid and salts thereof; 0.1%-60.0% of a first emollient; 0.1%-5.0% of a thickening agent; 0.05%-0.5% of a chelating agent; and the balance of deionized water. The leontopodium alpinum extract is compounded with other components to form a compound system with efficient buffer performance, so that the pH value can be accurately and effectively adjusted, the stability of a cosmetic system can be enhanced, the negative influence of a pH regulator on the performance of a product is reduced, the irritation of the product is greatly reduced, and the skin care effect is improved. Meanwhile, the skin care composition can play a role in reducing the change amplitude of the pH of the skin after the product is used, and the effects of protecting and repairing the skin barrier are achieved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of daily chemicals, and particularly relates to an extraction process of edelweiss extract, a pH adjusting composition of the edelweiss extract and application. BACKGROUND

[0002] In recent years, the research on the skin barrier function and health of human body in the field of medicine and chemical industry is more and more in-depth, and a detection and evaluation system for the skin barrier function is established by taking a plurality of quantified parameters of skin physiological function characteristics including skin hydration, skin oil content and trans-epidermal water loss as indexes, wherein the weight of the skin surface pH value data in the related evaluation system is also increasing, and the skin surface pH value data becomes an important index for evaluating the skin barrier health.

[0003] The pH value of the surface of human skin is not only an important characterization data of the biological activities of human body on the epidermis, but also affects the biological activities and regulating functions of the epidermis, dermis and even subcutaneous tissue of human skin. When the skin pH value is significantly changed due to factors such as environment, medicine, cosmetics or skin diseases, the skin barrier function of the individual is also affected to a certain extent. For example, the use of high-pH value products based on soap may increase the probability of skin dryness and itching, make the skin more sensitive to physical and chemical stimulation, affect the activity of enzymes related to the skin barrier function, and thus reduce the recovery rate of the skin barrier and the density of the stratum corneum, and weaken the moisture retention and anti-pollution functions of the stratum corneum. Therefore, the selection of suitable cosmetics for the skin pH value and the maintenance of the skin pH value are important measures to protect the skin barrier health.

[0004] The traditional pH adjusters for cosmetics, such as sodium hydroxide, potassium hydroxide and triethanolamine, are widely used in cosmetics, but may have adverse effects on other properties of the cosmetics, such as affecting the color, odor or texture stability of the product. At the same time, such pH adjusters may have certain irritation to the skin, especially for sensitive skin, and long-term use of products containing these components may cause skin dryness, redness and other discomfort symptoms, and adversely affect the health of human skin. SUMMARY

[0005] The technical problem to be solved by the present application is to provide an extraction process of edelweiss extract and a composition and application thereof. The edelweiss extract and the remaining components are compounded to form a compounded system with high buffering performance, which can not only accurately and effectively adjust the pH value, but also enhance the stability of the cosmetic system, reduce the negative effects of the pH adjuster on the performance of the product, and greatly reduce the irritation of the product.

[0006] The technical solution adopted by the present application to solve the above problems is as follows: An extraction process of a Ledum palustre extract, comprising the following steps: R1. Drying Ledum palustre at 45-50℃ for 40-50h, crushing and sieving through a 40-60 mesh sieve after drying to obtain Ledum palustre powder; R2. Mixing and soaking Ledum palustre powder with 30% ethanol and 1% dilute hydrochloric acid for 18-26h for acidification, the ratio of the mass of Ledum palustre powder to the volume of ethanol being 50-200mL of ethanol per 50g of Ledum palustre powder, and the ratio of the mass of Ledum palustre powder to the volume of dilute hydrochloric acid being 5-15mL of dilute hydrochloric acid per 50g of Ledum palustre powder, to obtain an acid treatment solution; R3. Vacuum extraction filtration of the acid treatment solution through a 0.22-0.45μm microporous filter membrane, the vacuum degree being -0.08 to -0.04MPa and the time being 2-5min, to obtain a filtrate; R4. Supercritical extraction of the filtrate in an extraction kettle, introducing a fluid substance and setting the extraction temperature to 33±0.5℃, then introducing a entrainer, the flow rate of the entrainer being 0.1-0.5mL / min, the extraction being carried out for 10-50min after the extraction pressure rises to 20-50MPa, and after the extraction is completed, opening a pressure relief valve and setting the vent flow rate to 1-10L / min to collect an extract; R5. Reducing pressure drying and concentrating the extract, the concentration being carried out at 55-65℃ and -0.08 to -0.09MPa to a volume of 10-15% of the original volume to obtain a concentrated solution; R6. Spray drying the concentrated solution, adding 1-3% of malt dextrin by mass of the concentrated solution to the concentrated solution, adjusting the temperature to 95-110℃ and the atomization pressure to 0.2-0.3MPa to obtain a dry powder, mixing the dry powder with deionized water at a mass ratio of 1:10 to obtain a Ledum palustre extract.

[0007] Further, in step R4, the fluid substance includes at least one of carbon dioxide, dinitrogen oxide, ethylene, trichloromethane, nitrogen, and chlorine.

[0008] Further, in step R4, the entrainer includes at least one of methanol, ethanol, acetone, propane, toluene, and ethyl acetate.

[0009] Preferably, the concentration of the ethanol is 95%.

[0010] Through the technical scheme, the effective substances in the high mountain firebrush grass can be fully extracted, including the lipids with the core components of waxy alkane and phytosterol and various organic acids, the waxy alkane can reduce the water loss of the epidermis in the composition, the phytosterol can increase the antioxidant and anti-inflammatory capacity of the composition and strengthen the barrier function of the skin. The high mountain firebrush grass powder is subjected to acidification treatment, the distribution coefficient of the organic acid will change significantly after the solution is acidified, the organic acid is more easily transferred from the water phase to the organic phase, the solubility of the effective component in the solvent is improved, the separation effect of the effective component and the remaining substances is significantly improved, the selectivity of the extraction is improved, the interference of impurities is reduced, and the purity of the final product is improved.

[0011] The application further provides a pH adjusting composition containing the high mountain firebrush grass extract, which comprises the following components in percentage by mass: the high mountain firebrush grass extract 0.001%-10.0%; organic acid and its salts 0.01%-3.0%; the first emollient 0.1%-60.0%; thickening agent 0.1%-5.0%; chelating agent 0.05%-0.5%; and the balance of deionized water.

[0012] Through the technical scheme, the high mountain firebrush grass extract is rich in lipids, natural organic acids such as snow-cream flower acid, amino acids, proteins, polysaccharides, phenols, flavonoids, coumarin, saponins and other components, the lipids can strengthen the barrier function of the skin, the organic acids have an important influence on the pH value of the human skin, can enhance the activity of acid phosphatase A2 (PLA2), affect the generation of fatty acid products and the expression effect of hydrogen sodium exchange activity in the epidermal granular layer, and the enhancement of the enzyme activity is conducive to maintaining the stability of the skin pH. The high mountain firebrush grass extract can effectively adjust the pH value of the human skin surface, increase the content of the natural moisturizing factor in the skin horny layer, promote the transportation of water and glycerol from the dermis to the epidermis, enhance the skin hydration capacity and reduce the water loss of the epidermis. The application of the pH adjusting composition in cosmetics can control the amplitude of the skin pH value from the endogenous, the high mountain firebrush grass extract is more mild and soothing than the traditional chemical synthetic pH adjusting agent, can greatly reduce the skin irritation, has an obvious gain effect on maintaining the skin pH value, can reduce the influence of the cosmetics on the skin pH value and protect the skin barrier. Moreover, the pH adjusting composition can maintain the skin in a weak acid state, the weak acid environment can inhibit the breeding of pathogenic bacteria such as Staphylococcus aureus in cooperation with the antibacterial peptide in the high mountain firebrush grass extract without affecting the normal flora, and further protect the balance and integrity of the skin microbial barrier.

[0013] Further, the organic acid and its salts include at least one of α-hydroxy acid and its salts, β-hydroxy acid and its salts, dibasic carboxylic acid and its salts, tribasic carboxylic acid and its salts, and aromatic carboxylic acid and its salts.

[0014] Preferably, the organic acid and its salts include at least one of citric acid, fruit acid.

[0015] Through the above technical solution, the organic acid and its salts can maintain the pH stability of the product, and have the function of adjusting the skin pH, so that the pH of the skin is more stable.

[0016] Further, the first emollient includes glycerin.

[0017] Further, the thickening agent includes at least one of cellulose thickening agent, acrylic cross-linked polymer thickening agent, microbial exopolysaccharide thickening agent, and synthetic polymer thickening agent.

[0018] Preferably, the thickening agent includes at least one of sodium acrylates / acryloyldimethyltaurate copolymer, gum arabic, and xanthan gum.

[0019] Through the above technical solution, the pH adjusting composition of the present application is more stable in cold resistance and heat resistance, and when added to the cosmetic system, the flat appearance is not easy to turn yellow.

[0020] Further, the chelating agent includes at least one of ethylenediaminetetraacetic acid disodium salt, ethylenediaminetetraacetic acid tetrasodium salt, and ethylenediamine disuccinic acid trisodium salt.

[0021] Through the above technical solution, the metal ions in the chelating agent can synergistically enhance the preservative, so that the composition of the present application is more stable and not easy to discolor.

[0022] The present application also provides a skin care composition containing the pH adjusting composition, which comprises the following components in percentage by weight: the pH adjusting composition of the present application 1.0%-10.0%; emulsifier 0.5%-5.0%; second emollient 0.1%-30.0%; antioxidant 0.1%-1.0%; efficacy additive 0.1%-10.0%; and the balance is deionized water.

[0023] Further, the emulsifier includes at least one of PEG-100 stearate, glyceryl stearate, and potassium cetyl phosphate.

[0024] Through the above scheme, the oil-water phase mixing of the skin care composition can be more uniform, the possibility of oil-water separation of the skin care composition leading to product layering can be reduced, and the stability of the product can be improved.

[0025] Further, the second emollient includes at least one of propylene glycol, sodium hyaluronate, tremella polysaccharide, 1,2-hexanediol, isopropyl palmitate, squalane, caprylic / capric triglyceride, cetyl stearyl alcohol, dimethicone, and hydrogenated polyisobutylene.

[0026] By the technical scheme, the 1,2-hexanediol, squalane, caprylic / capric triglyceride, cetyl stearyl alcohol, dimethicone and hydrogenated polyisobutylene are compounded to make the second emollient have the functions of softening, sealing and moisture absorption, and the components can synergistically act, so that the best effects of moisturizing, barrier repairing and improving skin feeling are achieved, and the selected second emollient is suitable for various dosage forms (water, gel, cream, wax-based dosage form, etc.), and is suitable for various skin types and different use scenarios.

[0027] Further, the antioxidant includes at least one of para-hydroxyacetophenone, butylated hydroxytoluene and pentaerythritol tetra (bis-tert-butyl hydroxyl hydrogenated cinnamic acid) ester.

[0028] By the technical scheme, the antioxidant can prevent or delay product oxidation, and make the composition more stable and not easy to discolor.

[0029] Further, the efficacy additive includes at least one of ceramide, asiaticoside, sodium lactate, farnesol, nicotinamide, retinol, glabridin, shea butter and macadamia nut oil.

[0030] By the technical scheme, the shea butter and macadamia nut oil are safe and mild, and have very low risk of causing acne, the high content of palmitoleic acid in the macadamia nut oil is highly similar to sebum, is beneficial to absorption, can significantly reduce trans-epidermal water loss after absorption, and can improve the barrier repair ability of the composition.

[0031] The application also provides a use of a pH adjusting composition containing edelweiss extract, including the following steps: A1. Selection and pretreatment of raw materials, the raw materials of the skin care composition are strictly selected to ensure the purity and quality stability, the pH value of the deionized water is limited to 6.5, the conductivity is 2.5 muS, the content of heavy metals such as lead, arsenic, mercury, cadmium and antimony in the deionized water is limited to 0.001 ppm, and the raw materials containing acidic or alkaline impurities are purified or neutralized. A2. The pretreated raw materials are added to a container, stirred and mixed uniformly, heated to 83±2 DEG C for emulsification reaction, in the emulsification process, the pH value of the material is monitored in real time by using a high-precision pH sensor; when the pH value of the material is lower than the target pH value range 5.5, the pH adjusting composition of the application is slowly added through an automatic control system, and the addition amount is 0.05% of the total mass of the material each time; continuously stir and detect the pH value during the addition process, until the pH value reaches 5.5 and is stable in the target range.

[0032] By the technical scheme, the pH value fluctuation range of the finished product can be within 5.5±0.2, and the color, odor and texture of the material remain stable, and phenomena such as stratification and displacement do not occur.

[0033] The present application has the following advantages: The present application can form a complex system with high buffering performance by compounding the high mountain edelweiss extract with other components, which can not only realize accurate and effective pH value adjustment, but also enhance the stability of the cosmetic system, reduce the negative impact of the pH adjuster on product performance, greatly reduce the irritation of the product, and the skin care composition of the present application can reduce the change range of skin pH after using the product, and has the effect of protecting and repairing the skin barrier. DETAILED DESCRIPTION

[0034] To make the technical problems, technical solutions and technical advantages of the present application clearer, specific examples will be described in detail below, but the protection scope of the present application is not limited to the following specific examples, and the described examples are only a part of the examples of the present application, rather than all the examples, and are not a limitation of the present application. Based on the examples in the present application, all other examples obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0035] Unless otherwise defined, all professional terms used below have the same meaning as generally understood by those skilled in the art. The professional terms used in the present application are only for the purpose of describing specific examples, and are not intended to limit the protection scope of the present application.

[0036] Unless otherwise specified, various raw materials, reagents, instruments and equipment used in the present application can be purchased from the market or can be prepared by existing methods.

[0037] In the quantitative test of the following examples, three repeated experiments were set, and the data were the average value or average value ± standard deviation of the three repeated experiments.

[0038] The pH adjusting compositions 1-6 respectively provide a pH adjusting composition, and the specific components and contents are shown in Table 1, and the unit is weight percent.

[0039] The skin care compositions of examples 1-5 and comparative examples 1-2 respectively provide a skin care composition, and the specific components and contents are shown in Table 2, and the unit is weight percent.

[0040] Table 1

[0041] Table 2

[0042] Specifically, the preparation method of the edelweiss extract in the above-mentioned pH adjusting composition comprises the following steps: R1. Dry Leonticum saeva at 48℃ for 48h, after drying, crush and pass through a 50 mesh sieve to obtain Leonticum saeva powder; R2. Mix Leonticum saeva powder with ethanol with a concentration of 30% and dilute hydrochloric acid with a concentration of 1% and soak for 24h for acidification, the ratio of the mass of Leonticum saeva powder to the volume of ethanol is 50g of Leonticum saeva powder to 100mL of ethanol, the ratio of the mass of Leonticum saeva powder to the volume of dilute hydrochloric acid is 50g of Leonticum saeva powder to 10mL of dilute hydrochloric acid, to obtain an acid treatment liquid; R3. Vacuum extract filter the acid treatment liquid through a microporous filter membrane with a pore size of 0.35μm, the vacuum degree is-0.05MPa, the time is 5min, to obtain a filtrate; R4. Add the filtrate to an extraction kettle for supercritical extraction, introduce carbon dioxide and set the extraction temperature to 33±0.5℃, then introduce ethanol with a concentration of 95%, the flow rate of the entraining agent is 0.25mL / min, when the extraction pressure rises to 30MPa, extract for 15min, after the extraction is completed, open the pressure relief valve and set the vent flow rate to 5L / min, the supercritical fluid carrying the extract expands through the pressure relief valve, releasing the extract, and the extract liquid is collected; R5. Perform vacuum drying concentration on the extract liquid, under the condition of 65℃ and-0.08MPa, concentrate to 15% of the original volume, to obtain a concentrated liquid; R6. Perform spray drying on the concentrated liquid, add maltodextrin with a mass of 3% of the concentrated liquid to the concentrated liquid, adjust the temperature to 105℃, and the atomization pressure to 0.3MPa, to obtain a dry powder, mix the dry powder with deionized water, the mass ratio of the dry powder to the deionized water is 1:10, to obtain Leonticum saeva extract.

[0043] Specifically, the preparation method of the above-mentioned pH adjusting composition 1-5 comprises the following steps: S1. Stir the acacia gum, xanthan gum, sodium acrylate / sodium acryloyldimethyl taurate copolymer, and ethylenediaminetetraacetic acid disodium salt in hot deionized water in a suitable container under the condition of 83℃ heat preservation until completely dissolved, to obtain a mixed material; S2. Mix the glycerol, Leonticum saeva extract, and citric acid in a suitable container at room temperature, stir until completely dissolved, and then add to the mixed material and homogenize for 10min; after stirring uniformly and cooling to 40℃, stop stirring, and cool to room temperature to obtain the composition.

[0044] Similarly, the preparation method of the pH adjusting composition 6 can be obtained by deleting the Leonticum saeva extract in the corresponding preparation steps.

[0045] Specifically, the preparation method of the above-mentioned examples 1-5 comprises the following steps: T1. Add deionized water and pH adjusting composition into a suitable container to obtain a pH adjusting composition solution; T2. Heat cetyl stearyl alcohol, isopropyl palmitate, dimethicone, PEG-100 stearate, hydrogenated polyisobutene, shea butter, macadamia oil in a suitable container to 83℃ and stir until completely dissolved, then add to the pH adjusting composition solution and homogenize for 10 min to obtain material 1; T3. Mix p-hydroxyacetophenone, 1,2-hexanediol uniformly to obtain material 2; T4. After the material 1 is cooled to 45℃, add the material 2 to the material 1, stir uniformly and cool to 40℃, then stop stirring to obtain the finished product.

[0046] The preparation method of the comparative examples can be obtained in the same way. If the comparative examples contain substances that are not added, they can be deleted in the corresponding preparation steps.

[0047] The production process of the above examples 1-5 and comparative example 1 includes the following steps: A1. Selection and pretreatment of raw materials, strictly select the raw materials of the skin care composition to ensure purity and quality stability, limit the pH value of deionized water to 6.5, the conductivity to 2.5 μS, and the content of heavy metals such as lead, arsenic, mercury, cadmium and antimony in deionized water to 0.001 ppm, and purify or neutralize the raw materials containing acidic or basic impurities; A2. Add the pretreated raw materials to the container, stir and mix uniformly, heat to 83±2℃ for emulsification reaction, and use a high-precision pH sensor to monitor the pH value of the material in real time during the emulsification process; when the pH value of the material is lower than the target pH value range 5.5, slowly add the pH adjusting composition of the application through the automatic control system, the amount of each addition is 0.05% of the total mass of the material; continue to stir and detect the pH value during the addition process until the pH reaches 5.5 and stabilizes in the target range.

[0048] Test method: 1. Product stability test Initial state record: describe the initial state of the sample in writing, record the pH value for subsequent observation reference; Select reference sample: select the 25℃ plate as the reference sample for intuitive comparison. Place the sample to be tested in the test box according to the test conditions (-15℃, 5℃, 25℃, 48℃), find out in order at the specified time (7d), place in the 25℃ constant temperature box for 24h to recover to 25℃, then observe and compare; Observation record: the tester fills in the test results in the corresponding form when observing the sample periodically. According to the requirements of the test scheme, the sample is diluted with water (the mass ratio of sample to water is 1:9), and the test is carried out and the data is recorded by the stability tester. The specific test results are shown in Table 3.

[0049] Table 3 Stability test

[0050] From the test results of Examples 1-5, it can be seen that the pH stability of the skin care composition of the present application is excellent, and as the amount of high mountain firebrush extract and the amount of pH adjusting composition added increases, the pH change rate of the skin care composition of the present application decreases, and by comparing the test results of Example 5 with those of Comparative Example 1, it can be seen that the addition of the pH adjusting composition prepared in the present application can effectively maintain the pH stability of the composition.

[0051] 2. Skin pH stability test 70 volunteers aged 20-60 years old were randomly divided into 7 groups, with 10 people in each group. Among them, groups 1-5 correspond to Examples 1-5, and groups 6-7 correspond to Comparative Examples 1-2.

[0052] The inner side of the arm was chosen as the test site, and the test site could not be used with any product (cosmetic or external medicine) for 2-3 days before testing, and could not be in contact with water for 1-3 hours. Three test areas were selected on the test site in the longitudinal direction (2 cm apart); The subjects needed to clean the test site with clean water, and wipe it dry with a dry tissue paper. In a room meeting the environmental requirements, sit still for 10 minutes, and do not drink water and beverages during this period. The test site was exposed and placed in the test state, and remained relaxed; Using Skin-pH-Meter skin pH test probe to test the skin pH value of the sample area of the subjects, measuring 3 times in each area, and taking the average value as the basic skin pH value; Use sample: 0.2g sample is applied to the sample area, wet with clean water, and roll 20 times, then rinse with clean water; Test: timing starts from the time of applying the sample, and the change rate of the skin pH value of the test subjects after using the test product for 6h is determined by the instrument, and the protection effect of the product on the skin barrier is evaluated on this basis.

[0053] The specific test results are shown in Table 4.

[0054] Table 4

[0055] From the test results of Examples 1-5 and Comparative Example 1, it can be seen that after using the skin care composition of the present application, the pH stability of the skin of the subjects changed less, and as the amount of high-mountain firebrush extract prepared by the present application and the pH adjusting composition increased, the pH stability of the skin of the subjects improved significantly.

[0056] As can be seen from Comparative Example 5 and Comparative Example 2, the application of the "pH adjusting composition containing high-mountain firebrush extract" provided by the present application has a more positive effect on maintaining the pH of the product and human skin by screening and pretreating the cosmetic raw materials, and monitoring and adjusting the pH value in real time during the production process.

[0057] The above describes the preferred embodiments of the present application, but the present application is not limited to the specific details in the above embodiments, and various simple modifications can be made to the technical solutions of the present application within the technical concept of the present application, and these simple modifications all belong to the protection scope of the present application.

[0058] In addition, it should be noted that each specific technical feature described in the above specific embodiments can be combined in any appropriate manner without contradiction. In order to avoid unnecessary repetition, the present application will not further describe various possible combinations.

[0059] In addition, various different embodiments of the present application can also be combined in any manner, as long as it does not deviate from the idea of the present application, and it should also be considered as disclosed by the present application.

Claims

1. An extraction process for Edelweiss extract, characterized in that, Includes the following steps: R1. Dry the alpine edelweiss at 45-50℃ for 40-50 hours, then pulverize it and pass it through a 40-60 mesh sieve to obtain alpine edelweiss powder. R2. Mix edelweiss powder with 30% ethanol and 1% dilute hydrochloric acid and soak for 18-26 hours for acidification. The mass ratio of edelweiss powder to ethanol volume is 50-200 mL of ethanol for every 50 g of edelweiss powder, and the mass ratio of edelweiss powder to dilute hydrochloric acid volume is 5-15 mL of dilute hydrochloric acid for every 50 g of edelweiss powder, to obtain the acid treatment solution. R3. The acid treatment solution is vacuum extracted and filtered through a 0.22-0.45 μm microporous membrane at a vacuum degree of -0.08 to -0.04 MPa for 2 to 5 min to obtain the filtrate. R4. Add the filtrate to the extraction vessel for supercritical extraction, introduce the fluid substance and set the extraction temperature to 33±0.5℃, then introduce the entrainer at a flow rate of 0.1~0.5mL / min. When the extraction pressure rises to 20~50MPa, extract for 10~50min. After extraction, open the pressure reducing valve and set the venting flow rate to 1~10L / min, and collect the extract. R5. The extract is dried and concentrated under reduced pressure at 55-65℃ and -0.08--0.09MPa to 10-15% of its original volume to obtain a concentrated solution. R6. Spray dry the concentrate, add 1-3% maltodextrin by mass of the concentrate to the concentrate, adjust the temperature to 95-110℃ and the atomization pressure to 0.2-0.3MPa to obtain a dry powder, mix the dry powder with deionized water at a mass ratio of 1:10 to obtain the alpine edelweiss extract.

2. A pH-adjusting composition containing Edelweiss extract, characterized in that, Includes the following components by weight percentage: The extract of Edelweiss as described in claim 1 comprises 0.001% to 10.0%; organic acids and their salts comprise 0.01% to 3.0%; a first emollient comprises 0.1% to 60.0%; a thickener comprises 0.1% to 5.0%; a chelating agent comprises 0.05% to 0.5%; and the balance comprises deionized water.

3. The pH-adjusting composition containing Edelweiss extract according to claim 2, characterized in that, The organic acids and their salts include at least one of α-hydroxy acids and their salts, β-hydroxy acids and their salts, dicarboxylic acids and their salts, tricarboxylic acids and their salts, and aromatic carboxylic acids and their salts.

4. The pH-adjusting composition containing Edelweiss extract according to claim 2, characterized in that, The first emollient includes glycerin.

5. The pH-adjusting composition containing Edelweiss extract according to claim 2, characterized in that, The thickener includes at least one of cellulose-based thickeners, acrylic cross-linked polymer thickeners, microbial extracellular polysaccharide thickeners, and synthetic polymer thickeners.

6. The pH-adjusting composition containing Edelweiss extract according to claim 2, characterized in that, The chelating agent includes at least one of disodium ethylenediaminetetraacetate, tetrasodium ethylenediaminetetraacetate, and trisodium ethylenediaminedisuccinate.

7. A skincare composition containing a pH-adjusting composition, characterized in that, Includes the following components by weight percentage: The pH adjusting composition according to any one of claims 2 to 6 comprises 1.0% to 10.0%; an emulsifier comprising 0.5% to 5.0%; a second emollient comprising 0.1% to 30.0%; an antioxidant comprising 0.1% to 1.0%; an efficacy additive comprising 0.1% to 10.0%; and the balance being deionized water.

8. The skincare composition containing a pH-adjusting composition according to claim 1, characterized in that, The emulsifier includes at least one of PEG-100 stearate, glyceryl stearate, and potassium cetyl phosphate.

9. The skincare composition containing a pH-adjusting composition according to claim 1, characterized in that, The second emollient includes at least one of propylene glycol, sodium hyaluronate, tremella polysaccharide, 1,2-hexanediol, isopropyl palmitate, squalane, caprylic / capric triglyceride, cetearyl alcohol, polydimethylsiloxane, and hydrogenated polyisobutylene.

10. The application of a pH-adjusting composition containing Edelweiss extract, comprising the following steps: A1. Raw material screening and pretreatment: The raw materials for the skin care composition are strictly screened to ensure purity and quality stability. The pH value of the deionized water used is limited to 6.5, the conductivity is 2.5μS, and the content of heavy metals such as lead, arsenic, mercury, cadmium, and antimony in the deionized water is limited to 0.001ppm. Raw materials containing acidic or alkaline impurities are purified or neutralized. A2. Add the pretreated raw materials to the container, stir and mix evenly, and heat to 83±2℃ for emulsification reaction. During the emulsification process, use a high-precision pH sensor to monitor the pH value of the material in real time. When the pH value of the material is lower than the target pH value range of 5.5, slowly add the pH adjustment composition of the present invention through the automated control system. The amount added each time is 0.05% of the total mass of the material. During the addition process, continue stirring and monitor the pH value until the pH reaches 5.5 and stabilizes within the target range.

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