An analytical method for stability of water-based cosmetics and its application

Abstract

The present disclosure provides an analytical method for the stability of water-based cosmetics and its application, belonging to the field of cosmetic technology. The analytical method for the stability of water-based cosmetics disclosed herein includes: taking a cosmetic sample and placing it in a detection bottle, and after irradiation with a xenon lamp, judging the stability of the cosmetic sample according to the changes in the turbidity and chromaticity of the cosmetic sample; the components of the cosmetics contain at least one of tranexamic acid, hydroxyphenylpropionamide benzoic acid, oat β-glucan, saccharide isomers, Damask rose flower water, silanediol salicylate, and hydroxyethylpiperazine ethane sulfonic acid. The present disclosure can quickly detect the stability of cosmetics by calculating the changes in the turbidity and chromaticity of cosmetics, reducing the test time of stability, and improving the detection accuracy and detection amount of cosmetic stability; it is conducive to the application in cosmetic quality control.

Description

Technical Field

[0001] The present disclosure relates to the technical field of cosmetics, and in particular to a method for analyzing the stability of cosmetics and an application thereof. Background Art

[0002] With the continuous development of cosmetic formulas and processes, various functional cosmetics and raw materials are widely used, and the introduction of compatibility degradation products and residual substances in products all affect the stability of products. The stability of cosmetics refers to its ability to maintain physical, chemical, biological and microbiological properties, and has always been one of the important issues of concern to R&D personnel, manufacturers and consumers.

[0003] Cosmetics stability assessment generally includes: physical and chemical stability test (general physical and chemical parameter changes, especially emulsification system stability), temperature and humidity stability test, etc. Chemical property changes include: discoloration, odor change, bacterial contamination, etc.; physical changes: precipitation, water precipitation, coarsening, gelation, etc. The traditional cosmetics stability assessment method steps are: fill the material, place it in a constant temperature box under different conditions such as room temperature, 45℃ high temperature, -10℃ low temperature, -15℃ low temperature, high and low temperature alternation, light, etc., and take out the material after 1 week, 2 weeks, 3 weeks, one month, two months, three months, etc., and inspect the material by observation, microscopy, and centrifugation.

[0004] The above methods have their own limitations, which are as follows: (1) Long test cycle: All three methods generally require 3-6 months of observation to obtain results; (2) Many influencing factors: The observation method is subjective, and the microscope method is operator-dependent, and different operators may come to different conclusions; (3) Accuracy deviation: The observation method requires that the product has phenomena that can be observed by the naked eye, and the results have a certain deviation from the shelf life; for solid color opaque lotions, the test results of some models of stability analyzers are less accurate; (4) For lotions containing particles, transparent liposomes, etc., upgraded instruments are required, which are expensive. In addition, the number of tests that can be performed on the instrument at one time is limited, and it is impossible to conduct large-scale tests in a short period of time. Summary of the invention

[0005] The purpose of the present disclosure is to overcome the deficiencies of the prior art and to provide an analytical method for the stability of water-based cosmetics and its application.

[0006] To achieve the above-mentioned purpose, the technical solution adopted by the present disclosure is: a method for analyzing the stability of water-based cosmetics, the method comprising: taking a cosmetic sample and placing it in a detection bottle, irradiating it with a xenon lamp, and judging the stability of the cosmetic sample according to the changes in the turbidity and chromaticity of the cosmetic sample;

[0007] The cosmetics contain at least one of tranexamic acid, hydroxyphenylpropionamide benzoic acid, oat beta-glucan, saccharide isomers, damask rose flower water, silanediol salicylate, and hydroxyethylpiperazine ethane sulfonic acid.

[0008] In some embodiments, the volume of the cosmetic sample is 10-100% of the volume of the detection bottle.

[0009] In some embodiments, the cosmetic composition contains at least one of oat β-glucan, saccharide isomers, damask rose flower water, silanediol salicylate, and hydroxyethylpiperazine ethane sulfonic acid.

[0010] In some embodiments, the detection bottle is a PE bottle or a quartz bottle.

[0011] In some embodiments, the irradiance of the xenon lamp is 0.3-1.0 W / m 2 .

[0012] In some embodiments, the temperature during xenon lamp irradiation is 30-80°C.

[0013] In some embodiments, the humidity during the xenon lamp irradiation is 0-85%.

[0014] In some embodiments, the criteria for determining the stability of the cosmetics are:

[0015] When the volume of the water-based cosmetic sample to be tested is 100% of the volume of the sample bottle, a xenon lamp is used for irradiation at a temperature of 55°C and a humidity of 60%, and the irradiance of the xenon lamp is 0.5W / m 2 After 24 hours of irradiation, the relationship between the chromaticity change rate, turbidity change rate and the storage time of the sample is as follows:

[0016] When the chromaticity change rate is ≤30% and the turbidity change rate is ≤20%, the stability of water-based cosmetics is level 1 and the sample can be stably stored for 3 years;

[0017] When the chromaticity change rate is greater than 30% and less than or equal to 60% and the turbidity change rate is greater than 20% and less than or equal to 70%, the stability of water-based cosmetics is level 2 and the sample can be stably stored for 2 years;

[0018] When the chromaticity change rate is >60% and the turbidity change rate is >70%, the stability of the water-based cosmetic is level 3 and the sample can be stably stored for 10 months.

[0019] In some embodiments, the cosmetic is of an oil-in-water type or a water-in-oil type.

[0020] On the other hand, the invention provides an application of the analytical method for the stability of aqueous cosmetics in the quality control of cosmetics.

[0021] Compared with the prior art, the beneficial effects of the present disclosure are as follows: the present disclosure provides an analytical method for the stability of water-based cosmetics, which can quickly detect the stability of cosmetics by calculating the changes in the turbidity and chromaticity of the cosmetics, reduce the stability test time, and improve the detection accuracy and detection amount of the cosmetics stability; it is conducive to the application in the quality control of cosmetics. DETAILED DESCRIPTION

[0022] With reference to the detailed description of the following embodiments, it will be easier to understand the advantages and features of the present disclosure and the methods for achieving the advantages and features. However, the present disclosure can be implemented in various other forms and should not be construed as being limited to the embodiments set forth herein. The embodiments disclosed herein are provided so that the disclosure of the present disclosure will be thorough and complete, and the scope of the present disclosure will be fully conveyed to those skilled in the art.

[0023] The terms used in the specification are intended to describe certain embodiments only and should by no means limit the present disclosure.Expressions in the singular include the meaning of the plural form unless clearly used otherwise.

[0024] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as those commonly understood by ordinary technicians in the field to which the present disclosure belongs. Any term defined in a comprehensive dictionary should be interpreted as having the same meaning in the context of the relevant field, and, unless explicitly defined otherwise, should not be interpreted as having an idealistic or overly formalistic meaning.

[0025] In order to solve the problem that the cosmetic stability test in the prior art is time-consuming and the test samples are few, the present disclosure provides a test method for the stability of water-based cosmetics, the analysis method comprising: taking a cosmetic sample and placing it in a test bottle, irradiating it with a xenon lamp, and judging the stability of the cosmetic sample according to the changes in the turbidity and chromaticity of the cosmetic sample;

[0026] The cosmetics contain at least one of tranexamic acid, hydroxyphenylpropionamide benzoic acid, oat beta-glucan, saccharide isomers, damask rose flower water, silanediol salicylate, and hydroxyethylpiperazine ethane sulfonic acid.

[0027] The analytical method disclosed in the present invention uses a xenon lamp to irradiate the cosmetics placed in a detection bottle, and then judges the stability of the cosmetics by the changes in the turbidity and chromaticity of the cosmetics. The detection time of the cosmetics stability of the present invention is short, and the detection accuracy of the cosmetics stability is high and the detection amount is large, which is conducive to the application in the quality control of cosmetics.

[0028] In some embodiments, the volume of the cosmetic sample is 10-100% of the volume of the detection bottle.

[0029] For example, in different embodiments, taking the volume of the detection bottle as 100%, the volume of the cosmetic sample can be but is not limited to 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 70%, 75%, 80%, 85%, 90%, 95%, or 100%.

[0030] The volume of cosmetic samples is different, and the oxygen content in the test bottle is also different. The present disclosure obtains test samples with different oxygen contents by controlling the volume of the cosmetic samples. In the present disclosure, the volume of the cosmetic samples is controlled to be 10-100% of the volume of the test bottle. Within this range, the degree of change of turbidity and chromaticity in the cosmetics is moderate, and the change of turbidity and chromaticity of the cosmetics can be better observed. If the volume of the cosmetic sample is too small, the turbidity and chromaticity of the cosmetics change too obviously, and the stability cannot be judged, resulting in the inability to judge the time for which the cosmetics can be stably stored; if the volume of the cosmetic sample is too large, the time required for the cosmetic stability test becomes longer.

[0031] In some embodiments, the cosmetic composition contains at least one of oat β-glucan, saccharide isomers, damask rose flower water, silanediol salicylate, and hydroxyethylpiperazine ethane sulfonic acid.

[0032] When the cosmetic sample of the present disclosure contains the above ingredients, the cosmetic has higher stability.

[0033] In some embodiments, the detection bottle is a quartz bottle.

[0034] Commonly used packaging materials for cosmetics are polyethylene bottles and quartz bottles. Compared with polyethylene bottles, quartz bottles have higher chemical inertness and barrier properties and lower permeability, which can improve the accuracy of cosmetic stability analysis results.

[0035] In some embodiments, the irradiance of the xenon lamp is 0.3-1.0 W / m 2 .

[0036] In different embodiments, the irradiance of the xenon lamp can be, but is not limited to, 0.3 W / m 2 , 0.4W / m 2 , 0.5W / m 2 , 0.6W / m 2 , 0.7W / m 2 , 0.8W / m 2 , 0.9W / m 2 , 1.0W / m 2 .

[0037] In some embodiments, the temperature during xenon lamp irradiation is 30-80°C.

[0038] For example, in different embodiments, the temperature during xenon lamp irradiation may be, but is not limited to, 30°C, 35°C, 40°C, 45°C, 50°C, 55°C, 60°C, 65°C, 70°C, 75°C, or 80°C.

[0039] In some embodiments, the humidity during the xenon lamp irradiation is 0-85%.

[0040] For example, in different embodiments, the humidity during xenon lamp irradiation can be, but is not limited to, 0%, 5%, 10%, 20%, 30%, 40%, 50%, 60%, 70%, or 80%.

[0041] In some embodiments, the criteria for determining the stability of the cosmetics are:

[0042] When the chromaticity change rate is ≤30% and the turbidity change rate is ≤20%, the stability of water-based cosmetics is level 1 and the sample can be stably stored for 3 years;

[0043] When the chromaticity change rate is >30% and ≤60% and the turbidity change rate is >20% and ≤70%, the stability of water-based cosmetics is level 2 and the sample can be stably stored for 2 years;

[0044] When the chromaticity change rate is >60% and the turbidity change rate is >70%, the stability of the water-based cosmetic is level 3 and the sample can be stably stored for 10 months; this indicates that the stability of the water-based cosmetic is poor, which may affect the accuracy of other subsequent performance tests.

[0045] In some embodiments, the cosmetic is of an oil-in-water type or a water-in-oil type.

[0046] In some embodiments, the cosmetics further include at least one adjuvant acceptable in the cosmetics field, such as thickeners, emulsifiers, humectants, hair conditioners, solubilizers, acid-base regulators, chelating agents, preservatives, essences or any other ingredients commonly used in cosmetics. The above-mentioned ingredients included in the composition according to the present application can each preferably be included in the composition of the present application within the range of the maximum usage amount indicated in the specifications prescribed by the governments of various countries.

[0047] Non-limiting examples of moisturizing agents include butylene glycol, glycerin, dipropylene glycol, trehalose, and betaine. Specifically, the mass of the moisturizing agent is 5-20% of the mass of the cosmetic.

[0048] Non-limiting examples of chelating agents include ethylenediaminetetraacetic acid, disodium ethylenediaminetetraacetate (disodium EDTA), tetrasodium ethylenediaminetetraacetate, and phytic acid; specifically, the mass of the chelating agent is 0.01-0.5% of the mass of the cosmetic.

[0049] Non-limiting examples of thickeners include: xanthan gum, acrylates / vinyl isodecanoate crosspolymer, polyacrylate crosspolymer-6, glyceryl acrylate / acrylic acid copolymer, ammonium acryloyldimethyltaurate / VP copolymer, hydroxyethyl acrylate / sodium acryloyldimethyltaurate copolymer, and carbomer; specifically, the mass of the thickener is 0.1-1% of the mass of the cosmetic.

[0050] On the other hand, the invention provides an application of the analytical method for the stability of aqueous cosmetics in the quality control of cosmetics.

[0051] The technical solution of the present disclosure is further described below through specific implementation methods. Those skilled in the art should understand that the embodiments are only to help understand the present disclosure and should not be regarded as specific limitations of the present disclosure.

[0052] The composition of the cosmetics tested below is as follows:

[0053] Lotion A: water 79.7%, butylene glycol 20%, disodium EDTA 0.1%, xanthan gum 0.2%.

[0054] Lotion B: water 78.7%, butylene glycol 20%, disodium EDTA 0.1%, xanthan gum 0.2%, tranexamic acid 1%.

[0055] Lotion C: water 79.4%, butylene glycol 20%, disodium EDTA 0.1%, xanthan gum 0.2%, hydroxyphenylpropionamide benzoic acid 0.3%.

[0056] Lotion D: water 79.1%, butylene glycol 20%, disodium EDTA 0.1%, xanthan gum 0.2%, oat β-glucan 0.6%.

[0057] Lotion E: water 79.4%, butylene glycol 20%, disodium EDTA 0.1%, xanthan gum 0.2%, carbohydrate isomers 0.3%.

[0058] Lotion F: water 76.7%, butylene glycol 20%, disodium EDTA 0.1%, xanthan gum 0.2%, rosa damascena flower water 3%.

[0059] Lotion G: Water 76.7%, Butylene glycol 20%, Disodium EDTA 0.1%, Xanthan gum 0.2%, Silanediol Salicylate 3%.

[0060] Lotion H: water 78.7%, butylene glycol 20%, disodium EDTA 0.1%, xanthan gum 0.2%, hydroxyethylpiperazine ethane sulfonic acid 1%.

[0061] In the following examples and comparative examples,

[0062] The color detection method is as follows:

[0063] The test was conducted in accordance with GB / T 23770-2009 General method for colorimetric determination of liquid inorganic chemical products, with samples not irradiated with a xenon lamp as the control group. The formula for calculating the colorimetric change rate was: (sample group - control group) / control group × 100%.

[0064] The turbidity detection method is as follows:

[0065] Select XZ-0101Z high-precision turbidity meter to read the turbidity value, turn on the power switch of the instrument, use standard turbidity solution to calibrate the instrument, put the sample to be tested into the sample bottle and pour it to the specified scale line, then screw on the bottle cap, wipe the sample bottle dry, put it in the sample bottle holder, and make sure the sample bottle is in the right position, then cover it with a light-shielding cover, and after the reading is stable, directly take the number and record it.

[0066] The sample without xenon lamp irradiation was used as the control group, and the calculation formula of turbidity change rate was: (sample group-control group) / control group×100%.

[0067] Example 1

[0068] This embodiment provides a method for analyzing the stability of cosmetics, the method comprising the following steps:

[0069] The cosmetic samples were placed in 50 mL transparent PE sample bottles and transparent quartz bottles, respectively, with the volume of the cosmetics accounting for 100% of the volume of the sample bottles. They were then irradiated with a xenon lamp at a temperature of 55 °C and a humidity of 60%. The irradiance of the xenon lamp was 0.5 W / m 2 The total irradiation time was 24 hours, and the experimental data were tested every 8 hours. The test results are shown in Table 1.

[0070] Table 1

[0071]

[0072]

[0073] Example 2

[0074] This embodiment provides a method for analyzing the stability of cosmetics, the method comprising the following steps:

[0075] The cosmetic samples were placed in 50 mL transparent quartz bottles, with the volume of the sample bottle as 100% and the volume of the cosmetics as shown in Table 2. Then, the samples were irradiated with a xenon lamp at a temperature of 50 °C and a humidity of 60%. The irradiance of the xenon lamp was 0.5 W / m 2 , irradiated for 2 hours in total, and tested the experimental data once at the intervals shown in Table 2. The test results are shown in Table 2.

[0076] Table 2

[0077]

[0078]

[0079]

[0080] Comparative Example 1

[0081] This comparative example provides a method for analyzing the stability of cosmetics, which comprises the following steps:

[0082] The cosmetic samples were placed in 50mL transparent PE bottles, with the volume of the cosmetics being 100% of the volume of the sample bottles, and then placed under 25°C (humidity 60%, light-proof), 40°C (humidity 60%, light-proof), and light (light incubator, 5000Lux visible light, 200Lux ultraviolet light, 40°C) conditions for a total of 3 months, with the experimental data tested every 1 month. The test results are shown in Table 3.

[0083] Table 3

[0084]

[0085]

[0086] Test result explanation

[0087] From the experimental data in Table 3, it can be seen that the stability test of traditional cosmetics takes at least 3 months. By comparing the experimental data in Table 1 and Table 3, it can be seen that the present disclosure can quickly test the stability of cosmetics by using xenon lamp irradiation and calculating the changes in turbidity and chromaticity of cosmetics.

[0088] Through multiple analyses of the chromaticity change rate and turbidity change rate of water-based cosmetics, it is known that

[0089] When the volume of the water-based cosmetic sample to be tested is 100% of the volume of the sample bottle, a xenon lamp is used for irradiation at a temperature of 55°C and a humidity of 60%, and the irradiance of the xenon lamp is 0.5W / m 2 After 24 hours of irradiation, the relationship between the chromaticity change rate, turbidity change rate and the storage time of the sample is as follows:

[0090] When the chromaticity change rate is ≤30% and the turbidity change rate is ≤20%, the stability of water-based cosmetics is level 1 and the sample can be stably stored for 3 years;

[0091] When the chromaticity change rate is greater than 30% and less than or equal to 60% and the turbidity change rate is greater than 20% and less than or equal to 70%, the stability of water-based cosmetics is level 2 and the sample can be stably stored for 2 years;

[0092] When the chromaticity change rate is >60% and the turbidity change rate is >70%, the stability of the water-based cosmetic is level 3 and the sample can be stably stored for 10 months.

[0093] When the volume of the water-based cosmetic sample to be tested is 10% of the volume of the sample bottle, and the sample bottle is made of quartz, a xenon lamp is used for irradiation at a temperature of 50°C and a humidity of 60%, and the irradiance of the xenon lamp is 0.5W / m 2 After 2 hours of irradiation, the relationship between the chromaticity change rate, turbidity change rate and the storage time of the sample is as follows:

[0094] When the chromaticity change rate is ≤80% and the turbidity change rate is ≤70%, the stability of water-based cosmetics is level 1 and the sample can be stably stored for 5 months;

[0095] When the chromaticity change rate is greater than 80% and less than or equal to 120% and the turbidity change rate is greater than 70% and less than or equal to 110%, the stability of the water-based cosmetic is level 2 and the sample can be stably stored for 3 months;

[0096] When the chromaticity change rate is >120% and the turbidity change rate is >110%, the stability of the water-based cosmetic is level 3 and the sample can be stably stored for 1 month.

[0097] When the volume of the water-based cosmetic sample to be tested is 20% of the volume of the sample bottle, and the sample bottle is made of quartz, a xenon lamp is used for irradiation at a temperature of 50°C and a humidity of 60%, and the irradiance of the xenon lamp is 0.5W / m 2 After 2 hours of irradiation, the relationship between the chromaticity change rate, turbidity change rate and the storage time of the sample is as follows:

[0098] When the chromaticity change rate is ≤70% and the turbidity change rate is ≤60%, the stability of water-based cosmetics is level 1 and the sample can be stably stored for 8 months;

[0099] When the chromaticity change rate is greater than 70% and less than or equal to 110% and the turbidity change rate is greater than 60% and less than or equal to 100%, the stability of the water-based cosmetic is level 2 and the sample can be stably stored for 6 months;

[0100] When the chromaticity change rate is >110% and the turbidity change rate is >100%, the stability of the water-based cosmetic is level 3 and the sample can be stably stored for 2 months.

[0101] When the volume of the water-based cosmetic sample to be tested is 50% of the volume of the sample bottle, and the sample bottle is made of quartz, a xenon lamp is used for irradiation at a temperature of 50°C and a humidity of 60%. The irradiance of the xenon lamp is 0.5W / m 2 After 2 hours of irradiation, the relationship between the chromaticity change rate, turbidity change rate and the storage time of the sample is as follows:

[0102] When the chromaticity change rate is ≤60% and the turbidity change rate is ≤50%, the stability of water-based cosmetics is level 1, and the sample can be stably stored for 1 year and 8 months;

[0103] When the chromaticity change rate is greater than 60% and less than or equal to 100% and the turbidity change rate is greater than 50% and less than or equal to 90%, the stability of water-based cosmetics is level 2, and the sample can be stably stored for 1 year and 2 months;

[0104] When the chromaticity change rate is >100% and the turbidity change rate is >90%, the stability of the water-based cosmetic is level 3 and the sample can be stably stored for 5 months.

[0105] When the volume of the water-based cosmetic sample to be tested is 80% of the volume of the sample bottle, and the sample bottle is made of quartz, a xenon lamp is used for irradiation at a temperature of 50°C and a humidity of 60%, and the irradiance of the xenon lamp is 0.5W / m 2 After 2 hours of irradiation, the relationship between the chromaticity change rate, turbidity change rate and the storage time of the sample is as follows:

[0106] When the chromaticity change rate is ≤50% and the turbidity change rate is ≤40%, the stability of water-based cosmetics is level 1, and the sample can be stably stored for 2 years and 6 months;

[0107] When the chromaticity change rate is greater than 50% and less than or equal to 90% and the turbidity change rate is greater than 40% and less than or equal to 80%, the stability of water-based cosmetics is level 2, and the sample can be stably stored for 1 year and 8 months;

[0108] When the chromaticity change rate is >90% and the turbidity change rate is >80%, the stability of the water-based cosmetic is level 3 and the sample can be stably stored for 8 months.

[0109] When the volume of the water-based cosmetic sample to be tested is 100% of the volume of the sample bottle, and the sample bottle is made of quartz, a xenon lamp is used for irradiation at a temperature of 50°C and a humidity of 60%, and the irradiance of the xenon lamp is 0.5W / m 2 After 2 hours of irradiation, the relationship between the chromaticity change rate, turbidity change rate and the storage time of the sample is as follows:

[0110] When the chromaticity change rate is ≤40% and the turbidity change rate is ≤30%, the stability of water-based cosmetics is level 1 and the sample can be stably stored for 3 years;

[0111] When the chromaticity change rate is greater than 40% and less than or equal to 70% and the turbidity change rate is greater than 30% and less than or equal to 70%, the stability of water-based cosmetics is level 2 and the sample can be stably stored for 2 years;

[0112] When the chromaticity change rate is >70% and the turbidity change rate is >70%, the stability of the water-based cosmetic is level 3 and the sample can be stably stored for 10 months.

[0113] It can be seen from the experimental data in Table 2 that the present invention can shorten the detection time of sample stability by adjusting the volume of cosmetics in the sample bottle. When the volume of the sample bottle is 100% and the volume of the cosmetics is 20-80%, the stability of the sample can be quickly detected within 2 hours.

[0114] Finally, it should be noted that the above embodiments are used to illustrate the technical solution of the present disclosure rather than to limit the protection scope of the present disclosure. Although the present disclosure has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present disclosure can be modified or replaced by equivalents without departing from the essence and scope of the technical solution of the present disclosure.

Claims

1. A method for analyzing the stability of water-based cosmetics, characterized in that: The analysis method comprises: taking a cosmetic sample and placing it in a detection bottle, irradiating it with a xenon lamp, and judging the stability of the cosmetic sample according to the changes in the turbidity and chromaticity of the cosmetic sample; The cosmetics contain at least one of tranexamic acid, hydroxyphenylpropionamide benzoic acid, oat β-glucan, carbohydrate isomers, damask rose flower water, silanediol salicylate, and hydroxyethylpiperazine ethane sulfonic acid; The irradiance of the xenon lamp is 0.3-1.0W / m 2 ; The temperature during the xenon lamp irradiation is 30-80°C; The humidity during the xenon lamp irradiation is 0-85%; The criteria for judging the stability of cosmetics are: When the volume of the water-based cosmetic sample to be tested is 100% of the volume of the sample bottle, a xenon lamp is used for irradiation at a temperature of 55°C and a humidity of 60%, and the irradiance of the xenon lamp is 0.5W / m 2 After 24 hours of irradiation, the relationship between the chromaticity change rate, turbidity change rate and the storage time of the sample is as follows: When the chromaticity change rate is ≤30% and the turbidity change rate is ≤20%, the stability of water-based cosmetics is level 1 and the sample can be stably stored for 3 years; When the chromaticity change rate is >30% and ≤60% and the turbidity change rate is >20% and ≤70%, the stability of water-based cosmetics is level 2 and the sample can be stably stored for 2 years; When the chromaticity change rate is >60% and the turbidity change rate is >70%, the stability of the water-based cosmetic is level 3 and the sample can be stably stored for 10 months.

2. The method for analyzing the stability of aqueous cosmetics according to claim 1, characterized in that: The volume of the cosmetic sample is 10-100% of the volume of the detection bottle.

3. The method for analyzing the stability of aqueous cosmetics according to claim 1, characterized in that: The cosmetics contain at least one of oat beta-glucan, saccharide isomers, damask rose flower water, silanediol salicylate and hydroxyethylpiperazine ethane sulfonic acid.

4. The method for analyzing the stability of aqueous cosmetics according to claim 1, characterized in that: The detection bottle is a PE bottle or a quartz bottle.

5. The method for analyzing the stability of aqueous cosmetics according to claim 1, characterized in that: The cosmetics are of oil-in-water type or water-in-oil type.

6. Use of the analytical method for the stability of aqueous cosmetics according to any one of claims 1 to 5 in the quality control of cosmetics.

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