Amino acid handmade transparent soap added with wheat bran and extracting solution thereof and performance research of amino acid handmade transparent soap

Abstract

The invention discloses an amino acid handmade transparent soap added with wheat bran and an extracting solution thereof and performance research thereof, and the amino acid handmade transparent soap comprises the following components in parts by weight: 25-28 parts of sodium cocoyl glutamate, sodium lauroyl sarcosinate, one or more of sodium cocoyl sarcosinate and sodium lauroyl glutamate, 5 parts of glycerol, 20 parts of propylene glycol and 0-1 part of betaine. The cleaning agent is prepared from 1-1.5 parts of sodium hydroxide, 6-8 parts of stearic acid, 18 parts of triethanolamine, 3-5 parts of trehalose, 5.5 parts of a wheat bran extracting solution, 1 part of wheat bran and the balance distilled water. Through continuous detection for 28 days, the product is transparent in appearance, wheat bran particles can be seen in a soap body, and the soap is high in hardness, appropriate in transparency, moderate in pH and rich in foam and has good detergency and exfoliating performance.

Description

TECHNICAL FIELD

[0001] The application relates to an amino acid handmade transparent soap added with wheat bran and its extract and a performance research method thereof, and belongs to the field of daily-use chemicals. BACKGROUND

[0002] The wheat bran contains rich polyphenol compounds, and the polyphenol compounds have strong antioxidant capacity, can effectively scavenge free radicals, slow down the oxidation and metamorphic process of oil, spices and other components in daily necessities, and prolong the shelf life of products. In skin care products, the polyphenol compounds in the water extract of the wheat bran can resist the oxidative damage of the skin caused by the external environment, such as ultraviolet irradiation and air pollution, and help prevent skin aging, skin discoloration and other skin problems.

[0003] Amino acids are basic substances for life activities. A synthetic amino acid surfactant synthesized by using amino acids has not only the basic properties of ordinary surfactants, but also the characteristics of antibacterial, low toxicity and easy biodegradation. At present, the amino acid surfactant has been applied to the field of daily-use chemicals, and with the promotion of the global green environmental protection trend, the research and development will be further deepened, and the amino acid surfactant will be more and more widely applied in various fields.

[0004] The amino acid soap on the market mainly contains amino acid surfactants, and the hardness of the amino acid soap does not meet the standard, which leads to unsuccessful demolding when the soap is handmade, and the function of the soap is single. The application explores the ratio of different amino acid surfactants, improves the hardness and demolding smoothness of the amino acid soap, and comprehensively applies the water extract of the wheat bran and the wheat bran to increase the functionality of the amino acid soap and improve the application range of the amino acid handmade soap. SUMMARY

[0005] The application aims to provide an amino acid handmade transparent soap added with wheat bran and its extract, which has the advantages of transparent appearance, visible wheat bran particles in the soap body, smooth demolding, high hardness, rich foam, good dirt removal capacity and exfoliation performance, and wide application scenarios.

[0006] The amino acid handmade transparent soap added with wheat bran and its extract comprises the wheat bran added in the soap body, and the soap components contain 1-4 kinds of amino acid surfactants, and the remaining components are glycerol, propylene glycol, betaine, sodium hydroxide, stearic acid, triethanolamine, distilled water, trehalose, wheat bran extract and wheat bran.

[0007] Further, in the technical scheme, the amino acid surfactant is selected from one or more of sodium cocoyl glutamate, sodium lauroyl sarcosinate, sodium cocoyl sarcosinate and sodium lauroyl glutamate.

[0008] Further, in the above technical solution, the amino acid handmade transparent soap comprises 25-28 parts of amino acid surfactant, 5 parts of glycerol, 20 parts of propylene glycol, 0-1 part of betaine, 1-1.5 parts of sodium hydroxide, 6-8 parts of stearic acid, 18 parts of triethanolamine, 3-5 parts of trehalose, 5.5 parts of wheat bran extract, 1 part of wheat bran, and the rest is distilled water.

[0009] The preparation method of the amino acid handmade transparent soap added with wheat bran and its extract comprises the following steps:

[0010] 1) Weigh the wheat bran, heat it to reflux extraction, and each time after soaking in distilled water, heat it to reflux extraction again, filter and combine the filtrate, filter, concentrate the filtrate, centrifuge it in a high-speed centrifuge, and collect the supernatant;

[0011] 2) Weigh glycerol, 1,2-propylene glycol, anhydrous ethanol, stearic acid and betaine and transfer them to beaker A, which is placed in a water bath for heating and stirring until the mixture in beaker A is transparent;

[0012] 3) Weigh the amino acid surfactant and slowly add it to beaker A;

[0013] 4) Weigh sodium hydroxide into beaker B, which is placed in an ice water bath, add an appropriate amount of distilled water to dissolve it completely, and weigh an appropriate amount of triethanolamine and transfer it to beaker B, then pour the mixed solution in beaker B into beaker A after the mixture in beaker A is completely dissolved and stir;

[0014] 5) Weigh anhydrous trehalose in beaker C, add an appropriate amount of wheat bran extract to dissolve it completely, preheat it to 45-50℃, and then add the mixed solution obtained in step 4) to beaker A after stirring for 10-20 minutes;

[0015] 6) Weigh the wheat bran and transfer it to beaker A, slowly and uniformly stir it, then pour it into a mold, carefully shake the mold containing the soap solution to remove the bubbles, and cool it at room temperature for 12-16 hours before demolding;

[0016] 7) After demolding, place the soap on a wooden pad frame at room temperature for airing, and air it for 4-6 weeks to obtain the amino acid handmade transparent soap added with wheat bran and its extract.

[0017] Further, in the above technical solution, the heating temperature in step 2) is 45-50℃.

[0018] Further, in the above technical solution, in step 3), the amino acid surfactant is selected from one or more of sodium cocoyl glutamate, sodium lauroyl sarcosinate, sodium cocoyl sarcosinate and sodium lauroyl glutamate.

[0019] Further, in the above technical solution, in the step 7), the airing process detects the soap hardness, transparency, foam durability, detergency and exfoliation and the like.

[0020] The wheat bran water extract in the application contains rich polyphenols, which can resist the oxidative damage of the external environment to the skin, such as ultraviolet irradiation, air pollution and the like, and is helpful to prevent skin aging, skin discoloration and the like. The wheat bran particles have exfoliation function. The sodium cocoyl glutamate, sodium cocoyl methyl glutamate, sodium lauroyl glutamate and sodium lauroyl methyl glutamate are amino acid surfactants. The soap body is added with one or more of the above surfactants, so that the product has obvious good cleaning and skin care properties. After the soap is aired for 4-6 weeks, the product has good hardness, transparency, pH, foam stability, detergency and exfoliation effect. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 The figure is a needle penetration analysis chart in Example 4;

[0022] Figure 2 The figure is a transparency analysis chart in Example 4;

[0023] Figure 3 The figure is a foam durability test result chart in Example 4;

[0024] Figure 4 The figure is a detergency detection result chart in Example 4;

[0025] Figure 5 The figure is a chart of exfoliation of the amino acid handmade transparent soap with the addition of wheat bran and its extract on the upper arm of Student 1 in Example 4. DETAILED DESCRIPTION

[0026] In order to make the technical problems to be solved by the application, the technical solutions adopted and the beneficial effects achieved more clear, the application will be described in detail below with reference to the specific embodiments.

[0027] Example 1

[0028] 1) Take 25 parts of wheat bran, heat and reflux extraction for 3 times, the first time, add 10-12 times the amount of distilled water to the mass of the wheat bran, soak for 1 h, and extract for 1 h; the second time, add 8-10 times the amount of distilled water to the mass of the wheat bran, and extract for 1.0 h; the third time, add 8-10 times the amount of distilled water to the mass of the wheat bran, and extract for 1.0 h. Each time, filter, combine the filtrate, and filter, concentrate the volume of the filtrate to 5 times the mass of the wheat bran, centrifuge at 4500 rpm for 10 min, collect the supernatant, and reserve.

[0029] 2) Quantitative weighing 5 parts of glycerol, 20 parts of 1,2-propanediol, 4.5 parts of anhydrous ethanol and 8 parts of stearic acid into beaker A, beaker A is placed in water bath heating (45-50°C) stirring until the mixture in beaker A is transparent;

[0030] 3) Quantitative weighing 25 parts of sodium cocoyl glutamate into beaker A slowly;

[0031] 4) Quantitative weighing 1.5 parts of sodium hydroxide into beaker B, beaker B is placed in ice water bath, 10 parts of distilled water is added to make it completely dissolved, quantitative weighing 18 parts of triethanolamine is transferred into beaker B, after the mixture in beaker A is completely dissolved, the mixed solution in beaker B is poured into beaker A, stirring for 15 min;

[0032] 5) Quantitative weighing 3 parts of anhydrous trehalose in beaker C, 5.5 parts of wheat bran extraction concentrated solution is added to make it completely dissolved, preheated to 45-50°C, after the mixture in step 3 is stirred for 15 min, the solution in beaker C is added into beaker A;

[0033] 6) Quantitative weighing 1 part of wheat bran is transferred into beaker A, after slow and uniform stirring, it is poured into the mold, the mold containing soap solution is carefully shaken to remove bubbles, and it is cooled at room temperature for 12 hours before demolding.

[0034] 7) After demolding, the soap is placed on a solid wood pad frame to dry at room temperature, and the soap is dried for 4-6 weeks, and the hardness, transparency, foam durability, detergency and exfoliation of the soap are detected during the drying process.

[0035] Example 2

[0036] 1) Take 25 parts of wheat bran, extract 3 times by heating reflux, the first time adds 10-12 times the amount of distilled water to the mass of wheat bran, soaks for 1 h, and extracts for 1 h; the second time adds 8-10 times the amount of distilled water to the mass of wheat bran, extracts for 1.0 h; the third time adds 8-10 times the amount of distilled water to the mass of wheat bran, extracts for 1.0 h, each time filters, combines the filtrate, and extracts by suction, and the volume of the filtrate is concentrated to 5 times the mass of the wheat bran, centrifuged at 4500 rpm for 10 min, and the supernatant is collected for use.

[0037] 2) Quantitative weighing 5 parts of glycerol, 20 parts of 1,2-propanediol, 4.5 parts of anhydrous ethanol and 8 parts of stearic acid into beaker A, beaker A is placed in water bath heating (45-50°C) stirring until the mixture in beaker A is transparent;

[0038] 3) Quantitative weighing 25 parts of sodium cocoyl glutamate into beaker A slowly;

[0039] 4) Quantitative weighing 1.5 parts of sodium hydroxide into beaker B, beaker B is placed in ice water bath, add 10 parts of distilled water to make it completely dissolved, quantitative weighing 18 parts of triethanolamine into beaker B, after the above beaker A mixed solution completely dissolved, mixed solution in beaker B is poured into beaker A, stirring 15 min;

[0040] 5) Quantitative weighing 5 parts of anhydrous trehalose in beaker C, add 6 parts of wheat bran extraction concentrated solution to make it completely dissolved, preheated to 45-50℃, after step 3 mixed solution stirring 15 min, solution in beaker C is added into beaker A;

[0041] 6) Quantitative weighing 1 part of wheat bran into beaker A, slowly and evenly stirring after pouring into the mold, carefully shake the mold containing the soap solution to remove the bubbles, cooling at room temperature for 12 hours and then demolding.

[0042] 7) After demolding, the soap is placed on a solid wood pad frame to dry at room temperature, drying for 4-6 weeks, and the hardness, transparency, foam durability, detergency and exfoliation of the soap are detected during the drying process.

[0043] Example 3

[0044] 1) Take 25 parts of wheat bran, heat reflux extraction for 3 times, the first time adds 10-12 times the amount of distilled water to the mass of wheat bran, soaks for 1h, and extracts for 1h; The second time adds 8-10 times the amount of distilled water to the mass of wheat bran, extracts for 1.0h; The second time adds 8-10 times the amount of distilled water to the mass of wheat bran, extracts for 1.0h, each time filters, combines the filtrate, and filters, the volume of the filtrate is concentrated to 5 times the mass of the wheat bran, centrifuged at 4500 rpm for 10 min, and the supernatant is collected for use.

[0045] 2) Quantitative weighing 5 parts of glycerol, 20 parts of 1,2-propanediol, 3 parts of anhydrous ethanol and 6 parts of stearic acid, and 1 part of betaine into beaker A, beaker A is placed in water bath heating (45-50℃) stirring until the mixed solution in beaker A is transparent;

[0046] 3) Quantitative weighing 13 parts of sodium lauroyl sarcosinate and 13 parts of sodium cocoyl sarcosinate, slowly add into beaker A;

[0047] 4) Quantitative weighing 1 part of sodium hydroxide into beaker B, beaker B is placed in ice water bath, add 10 parts of distilled water to make it completely dissolved, quantitative weighing 18 parts of triethanolamine into beaker B, after the above beaker A mixed solution completely dissolved, mixed solution in beaker B is poured into beaker A, stirring 15 min;

[0048] 5) Quantitative weighing 3.5 parts of anhydrous trehalose in beaker C, add 5.5 parts of wheat bran extraction concentrated solution to make it completely dissolved, preheated to 45-50℃, after step 3 mixed solution stirring 15 min, solution in beaker C is added into beaker A;

[0049] 6) Quantitatively weigh 1 part of wheat bran into beaker A, pour into the mold after slow and uniform stirring, carefully shake the mold containing the soap solution to remove the bubbles, cool at room temperature for 12 hours, and then demold.

[0050] 7) After demolding, place the soap on a solid wood cushion frame to air dry at room temperature, air dry for 4-6 weeks, and detect the hardness, transparency, foam durability, detergency, and exfoliation of the soap during the air drying process.

[0051] Example 4

[0052] 1) Weigh 50 parts of wheat bran, heat and reflux extract 3 times, the first time add 10-12 times the amount of distilled water based on the mass of the wheat bran, soak for 1 h, and extract for 1 h; the second time add 8-10 times the amount of distilled water based on the mass of the wheat bran, extract for 1.0 h; the third time add 8-10 times the amount of distilled water based on the mass of the wheat bran, extract for 1.0 h, filter each time, combine the filtrates, suction filter, concentrate the volume of the filtrate to 5 times the mass of the wheat bran, centrifuge at 4500 rpm for 10 min, collect the supernatant, and reserve for use.

[0053] 2) Quantitatively weigh 5 parts of glycerol, 20 parts of 1,2-propanediol, 5.5 parts of anhydrous ethanol, and 8 parts of stearic acid into beaker A, place beaker A in a water bath to heat (45-50°C), and stir until the mixture in beaker A is transparent;

[0054] 3) Quantitatively weigh 9 parts of sodium lauroyl amino acid, 9 parts of sodium cocoyl glutamate, and 9 parts of sodium cocoyl amino acid into beaker A;

[0055] 4) Quantitatively weigh 1 part of sodium hydroxide into beaker B, place beaker B in an ice water bath, add 6 parts of distilled water to completely dissolve it, quantitatively weigh 18 parts of triethanolamine into beaker B, after the mixture in beaker A is completely dissolved, add the mixed solution in beaker B to beaker A, and stir for 15 min;

[0056] 5) Quantitatively weigh 3.5 parts of anhydrous trehalose into beaker C, add 5.5 parts of the concentrated extract of wheat bran to completely dissolve it, preheat to 45-50°C, after the mixture in step 3 is stirred for 15 min, add the solution in beaker C to beaker A;

[0057] 6) Quantitatively weigh 1 part of wheat bran into beaker A, pour into the mold after slow and uniform stirring, carefully shake the mold containing the soap solution to remove the bubbles, cool at room temperature for 12 hours, and then demold.

[0058] 7) After demolding, place the soap on a solid wood cushion frame to air dry at room temperature, air dry for 4-6 weeks, and detect the hardness, transparency, foam durability, detergency, and exfoliation of the soap during the air drying process:

[0059] The hardness change of the soap within 4 weeks was detected by a SD-2801A needle penetration hardness tester. The four corners and the middle part of the transparent soap were taken, avoiding the wheat bran particles, and the hardness of the middle and the four corners of the soap was detected by the needle penetration hardness tester for multiple times, and the average value was taken. The number of points for each soap was not less than 7 times. Figure 1 The results shown in the table are the hardness change. The soap was relatively soft and the hardness value was low when it was just demolded. The needle penetration value was large. With the extension of the airing time, the hardness gradually increased and the needle penetration value was small.

[0060] The transparency change of the soap within 4 weeks was detected by a WSB-3Y microcomputer fluorescence whiteness meter. The middle and the four corners of the whole soap were taken, avoiding the wheat bran particles, and the transparency of the middle and the four corners of the whole soap was detected by the fluorescence whiteness meter for multiple times, and the average value was taken. The number of points for each soap was not less than 7 times. Figure 2 The transparency change is shown in the table. As can be seen from the table, the transparency has a slight increasing tendency in the initial stage. The transparency has a decreasing trend in the long-term airing process. The transparent soap body is still clear and the wheat bran particles can be clearly seen at 28 days.

[0061] The foaming property was tested by a Roughty foam tester. 2.50g of transparent soap sample was dissolved in 100mL of hard water, and 900mL of distilled water was added to 1L scale line. The foaming ability and foam stability of the foaming agent solution were determined by a 2152 type Roughty foam tester. The 2152 type Roughty foam tester was a glass tube with an inner diameter of 50mm and a scale tube length of 700mm. The transparent soap hard water solution was dropped into the scale tube, and the foam activity occurred in the center of the scale tube. The foam height was measured, and the test was repeated for 3 times. The test results are shown in Table 1.

[0062] Table 1 Foaming ability of transparent soap of different formula amino acid

[0063]

[0064] The foam stability was verified by the following experiment. The foaming net was soaked in a beaker containing 20mL of hard water and 180mL of distilled water. The transparent soap was rubbed with the soaked foaming net, and then the foam was dropped onto the test bench. The size of the foam was observed after 10min, 20min and 30min of standing. As shown in the table, there was still stable foam after 10min of standing. Figure 3

[0065] The change trend of the pH of the soap during the airing process was detected. 1.50g of transparent soap just after molding and 1.50g of transparent soap placed for more than 15 days were taken, and a transparent soap solution with a mass fraction of 10% was prepared. The pH was measured by a S230-K type pH meter, and the results are shown in Table 2.

[0066] Table 2 PH change of transparent soap of different formula

[0067] ​

[0068] Table 2 shows that the soap solution is highly alkaline immediately after the reaction is complete. It needs to be left to stand for about 28 days until the pH drops to a slightly acidic or slightly alkaline level before it can be used.

[0069] Stain removal power evaluation, such as Figure 4 As shown in the figure, A represents three black circles of equal diameter from a ballpoint pen; B, from top to bottom, represents rubbing ten times clockwise with tap water, rubbing ten times clockwise with a wet, wheat-branch-free amino acid transparent soap, and rubbing ten times clockwise with a wet, wheat-branch-containing amino acid transparent soap; C, from top to bottom, represents the stain marks after rinsing with tap water. The figure shows that the cleaning power of the wheat-branch-containing amino acid transparent soap is significantly stronger than that of the wheat-branch-free amino acid transparent soap.

[0070] Exfoliation ability was verified using the Zhishanghemei M70001666 skin stratum corneum analyzer. This experiment used male students in their second year of university as test subjects. The stratum corneum condition of their upper arms was measured. A handmade transparent soap containing wheat bran and its extract was applied to the upper arms and rotated 10 times at a fixed location. After rinsing with tap water, the stratum corneum parameters were read using the instrument. Table 3 shows the exfoliation results of 10 second-year male students. Figure 5 The screenshot of the test results for Student 1 shows that the amino acid-based handmade transparent soap with added wheat bran and its extract has a good exfoliating effect.

[0071] Table 3. Exfoliation status of 10 second-year male students

[0072] student 1 2 3 4 5 6 7 8 9 10 uncleaned 33 40 45 52 29 55 51 36 39 43 soap 18 15 17 22 22 30 25 19 22 20

[0073] Notes: 1. Soap: A handmade transparent soap with added wheat bran and its extract; 2. The test data are the results of a single test. Each student will be tested three times in parallel, with an interval of 48 hours between each test. All tests showed good exfoliation results.

[0074] Example 5 (Four Amino Acid Surfactants)

[0075] 1) Weigh 50 portions of wheat bran, heat and reflux to extract 3 times. For the first extraction, add 10-12 times the weight of the wheat bran in distilled water, soak for 1 hour, and extract for 1 hour. For the second extraction, add 8-10 times the weight of the wheat bran in distilled water, and extract for 1 hour. For the third extraction, add 8-10 times the weight of the wheat bran in distilled water, and extract for 1 hour. Filter each time, combine the filtrates, filter by suction, concentrate the filtrate to 5 times the weight of the wheat bran, centrifuge at 4500 rpm for 10 minutes, collect the supernatant and set aside.

[0076] 2) Quantitative weighing 5 parts of glycerol, 20 parts of 1,2-propanediol, 5.5 parts of anhydrous ethanol and 8 parts of stearic acid into beaker A, beaker A is placed in water bath heating (45-50℃) stirring until the mixture in beaker A is transparent;

[0077] 3) Quantitative weighing 7 parts of sodium cocoyl glutamate, 7 parts of sodium cocoyl sarcosinate, 7 parts of sodium lauroyl glutamate, 7 parts of sodium lauroyl sarcosinate in beaker A, water bath heating, maintaining the temperature at 45-50℃.

[0078] 4) Quantitative weighing 1 part of sodium hydroxide into beaker B, beaker B is placed in ice water bath, adding 6 parts of distilled water to make it completely dissolved, quantitative weighing 20 parts of triethanolamine into beaker B, after the mixture in beaker A is completely dissolved, the mixed solution in beaker B is added into beaker A, stirring for 15 min;

[0079] 5) Quantitative weighing 5 parts of anhydrous trehalose in beaker C, adding 10 parts of wheat bran extract concentrate to make it completely dissolved, preheating to 45-50℃, after the mixture in step 3 is stirred for 15 min, the solution in beaker C is added into beaker A;

[0080] 6) Quantitative weighing 1 part of wheat bran into beaker A, slowly and uniformly stirring, then pouring into the mold, carefully shaking the mold containing the soap solution to remove bubbles, cooling at room temperature for 12 hours, then demolding.

[0081] 7) After demolding, the soap is placed on a solid wood pad rack to dry at room temperature, drying for 4-6 weeks, and the hardness, transparency, foam durability, detergency and exfoliation of the soap are detected during the drying process.

[0082] The above is only the preferred embodiment of the present application, it should be noted that for those skilled in the art, without departing from the principles of the present application, a number of improvements and refinements can be made, these improvements and refinements should also be considered as the protection scope of the present application.

Claims

1. A handmade transparent soap containing amino acids and wheat bran and its extract, characterized in that: The soap contains visible wheat bran, and the soap components contain 1-4 kinds of amino acid surfactants. The remaining components are glycerol, propylene glycol, betaine, sodium hydroxide, stearic acid, triethanolamine, distilled water, trehalose, wheat bran extract and wheat bran.

2. The amino acid-based handmade transparent soap according to claim 1, characterized in that: The amino acid surfactant is selected from one or more of sodium cocoyl glutamate, sodium lauroyl sarcosinate, and sodium cocoyl sarcosinate.

3. The amino acid-based handmade transparent soap according to claim 1, characterized in that: This amino acid handmade transparent soap comprises 25-28 parts by weight of amino acid surfactant, 5 parts of glycerol, 20 parts of propylene glycol, 0-1 parts of betaine, 1-1.5 parts of sodium hydroxide, 6-8 parts of stearic acid, 18 parts of triethanolamine, 3-5 parts of trehalose, 5.5 parts of wheat bran extract and 1 part of wheat bran, with the remainder being distilled water.

4. The method for preparing amino acid-based transparent handmade soap with added wheat bran and its extract according to any one of claims 1-3, characterized in that, Includes the following steps: 1) Weigh wheat bran, heat and reflux to extract, soak in distilled water each time and then heat and reflux to extract, filter and combine the filtrates, filter by suction, concentrate the filtrate, centrifuge with a high-speed centrifuge, and collect the supernatant; 2) Weigh glycerol, 1,2-propanediol, anhydrous ethanol, stearic acid and betaine and transfer them to beaker A. Place beaker A in a water bath and heat and stir until the mixture in beaker A becomes clear. 3) Weigh the amino acid surfactant and slowly add it to beaker A; 4) Weigh sodium hydroxide into beaker B, place beaker B in an ice-water bath, add an appropriate amount of distilled water to dissolve it completely, weigh an appropriate amount of triethanolamine and transfer it to beaker B, and after the mixture in beaker A is completely dissolved, pour the mixture in beaker B into beaker A and stir. 5) Weigh anhydrous trehalose into beaker C, add an appropriate amount of wheat bran extract to dissolve it completely, preheat to 45-50℃, stir the mixture obtained in step 4) for 10-20 minutes, and then add the solution in beaker C to beaker A. 6) Weigh the wheat bran and transfer it to beaker A. Stir slowly and evenly, then pour it into the mold. Gently shake the mold containing the soap solution to remove air bubbles. Cool at room temperature for 12-16 hours before unmolding. 7) After unmolding, place the soap on a solid wood rack at room temperature to air dry for 4-6 weeks to obtain a transparent handmade amino acid soap with added wheat bran and its extract.

5. The method for preparing amino acid-based transparent soap with added wheat bran and its extract according to claim 4, characterized in that: In step 2), the heating temperature is 45-50℃.

6. The method for preparing amino acid-based transparent soap with added wheat bran and its extract according to claim 4, characterized in that: In step 3), the amino acid surfactant is selected from one or more of sodium cocoyl glutamate, sodium lauroyl sarcosinate, sodium cocoyl sarcosinate, and sodium lauroyl glutamate.

7. The method for preparing amino acid-based transparent soap with added wheat bran and its extract according to claim 4, characterized in that: In step 7), the soap hardness, transparency, foam persistence, detergency, and exfoliation performance are tested during the drying process.

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