A large-scale rapid preparation method of rice water hydrolyzate suitable for cosmetics

Abstract

The present invention relates to a large-scale rapid preparation method for a rice water hydrolysate suitable for cosmetics. The rice water collected after rice washing is used as raw material. A continuous flow centrifugal-coordinated membrane separation technique is first used for solid-liquid separation, desalination, and impurity removal, followed by concentration to obtain a rice water concentrate. The solid obtained by centrifugation is then mixed with the rice water concentrate, and then subjected to a high-temperature rapid acid hydrolysis reaction to obtain a rice water hydrolysate solution having a content of ≥95%. Finally, the rice water hydrolysate is rapidly dried using a spray drying technique to form a rice water hydrolysate powder. The method of the present invention is simple and feasible overall, has convenient process operation, is low in cost, and is highly efficient, making it more suitable for large-scale production. The prepared rice water hydrolysate has a low molecular weight (substantially less than 5000 Da), a high molecular weight distribution concentration, and a high content of B vitamins. Furthermore, it exhibits excellent moisture absorption and moisture retention properties and antioxidant activity, making it particularly suitable for use in various cosmetics.

Description

Technical Field

[0001] The invention relates to a large-scale rapid preparation method of a rice washing water hydrolyzate suitable for cosmetics, and belongs to the fields of chemical reaction technology and cosmetics. Background Art

[0002] Rice is my country's staple food crop, producing over 200 million tons annually. Rice water, the water left after washing rice, contains nutrients such as protein, starch, and minerals. It can be used for washing the face, moisturizing the skin, and drinking after boiling. It helps protect the gastric mucosa, eliminate indigestion, and improve indigestion. Rice water is rich in cereal substances, essential nutrients for the skin, and washing your face with it can whiten and nourish the complexion. The dissolved starch, protein, and vitamins in rice water can break down facial oil and reduce pigmentation. Long-term use can lead to a fairer, smoother complexion and diminished acne scars.

[0003] In addition to rice washing water produced in ordinary households, large quantities of it are also produced as a byproduct in rice product processing plants, such as instant rice and rice noodles, and in rice wineries. my country consumes over one billion tons of water annually for rice washing. If this amount of rice washing water is not properly treated and discharged, it will cause eutrophication in rivers, lakes, and coastal waters, leading to serious environmental pollution.

[0004] Rice water is rich in protein, fat, carbohydrates, vitamin B1, vitamin B2, cellulose, and dozens of other nutrients beneficial to the human body. Effectively utilizing rice water as a cosmetic or food ingredient would not only reduce water pollution but also transform a waste resource into a viable one, creating added economic value.

[0005] Currently, most of the literature and patents related to rice water use a fermentation process to prepare rice water fermentation products. However, the fermentation reaction generally requires two tanks: a seed tank for cultivating microorganisms and a fermentation tank for biochemical reactions, which is relatively cumbersome; and to ensure high yields, the fermentation reaction generally uses a dilute solution, which still needs to be concentrated and purified in the later stage; at the same time, to ensure the ideal fermentation effect, the fermentation reaction requires the addition of a large number of microbial combinations (such as CN202011456715.X, CN202011460021.3, etc.), and is accompanied by complex and harsh fermentation conditions (such as dissolved oxygen, water activity, carbon dioxide content, and absence of bacteria), resulting in high production operation requirements; finally, the fermentation reaction time is long and is rarely completed within 1 hour. Some fermentation reactions take dozens of days or even half a year or several years to complete. Such a reaction is obviously not suitable for the efficient utilization of rice water as a waste by-product, and its technical process is difficult to promote on a large scale. Summary of the Invention

[0006] In order to solve the above technical problems, the technical solution of the present invention is:

[0007] A large-scale rapid preparation method of a rice water hydrolyzate suitable for cosmetics comprises the following steps:

[0008] (1) Centrifugation and concentration of rice water

[0009] The rice washing water collected after washing rice is first centrifuged at high speed using a continuous flow centrifuge, and the clear liquid obtained by centrifugation is then filtered through a nanofiltration membrane with a relative molecular mass of 500Da to 200Da to remove small molecular impurities and inorganic salts, and further concentrated to obtain a rice washing water concentrate with a concentration of 30% to 50%; the solid obtained by centrifugation is collected and set aside.

[0010] (2) High temperature rapid acid hydrolysis reaction

[0011] The rice washing water concentrate and the solid obtained by continuous flow centrifugation are mixed in an appropriate weight ratio and put into a reactor, an acid solution is added to adjust the pH to 2-3, and the reaction is stirred for 0.5-3 hours at a reaction temperature of 80-100°C. After the reaction is completed, the temperature is lowered to room temperature, and an alkali solution is added to adjust the pH to 5.5-7.5 to obtain a rice washing water hydrolyzate solution with a content of ≥95% and a molecular weight of less than 5000Da.

[0012] Preferably, the large-scale preparation method of the present invention further comprises:

[0013] (3) Rapid drying and sterilization packaging

[0014] The rice washing water hydrolysate solution is quickly dried by spray drying to obtain the rice washing water hydrolysate powder, which is then quickly sterilized by light radiation and finally aseptically packaged.

[0015] The high-speed centrifugal speed of the continuous flow centrifuge in step (1) is 10,000 to 15,000 rpm; the nanofiltration membrane with a relative molecular mass of 500Da to 200Da has a flow rate of 5 to 14 cubic meters per hour, a membrane pressure of 0.483 to 2.758 MPa, and a temperature of 20 to 50°C.

[0016] The weight ratio of the rice washing water concentrate in step (2) to the solid obtained by continuous flow centrifugation is 5:1 to 1:1; the acid used in adding the acid solution to adjust the pH value is citric acid, malic acid or sulfuric acid; the alkali used in adding the alkali solution to adjust the pH value is sodium bicarbonate, potassium bicarbonate, sodium hydroxide or potassium hydroxide.

[0017] The spray drying process in step (3) has an air inlet temperature of 120-180° C. and an air outlet temperature of 70-95° C. The light radiation used is ultraviolet radiation, γ-rays or electron beam radiation, with a radiation dose of 0.01-40 kGy and a radiation time of 1-60 minutes.

[0018] The present invention uses rice washing water discarded in batches from rice product (instant rice or rice noodles, etc.) processing plants or rice wineries as the raw material of rice washing water hydrolyzate. First, a continuous flow centrifugal synergistic membrane separation technology is adopted to achieve solid-liquid separation, desalination and impurity removal in one step, and concentration is performed to obtain a rice washing water concentrate. Then, based on mixing the solid obtained by centrifugation with the rice washing water concentrate, a high-temperature acid hydrolysis process is developed for rapidly preparing the rice washing water hydrolyzate for cosmetics. The prepared rice washing water hydrolyzate has a high molecular weight distribution concentration and a molecular weight of less than 5000 Da, which is more conducive to absorption by human skin.

[0019] The test shows that the cosmetic liquid containing the rice washing water hydrolyzate (2%) has better moisture absorption and moisturizing properties than the glycerin cosmetic liquid (2%) with the same content, and its antioxidant activity through different mechanisms is better than the vitamin E cosmetic liquid (2%) with the same content.

[0020] Compared with the prior art, the present invention has the following advantages:

[0021] 1. The present invention is based on the fact that rice washing water discarded in batches from rice product (instant rice or rice noodles, etc.) processing plants or rice wineries is used as raw material. Instead of adopting the more loaded down with trivial details and complicated fermentation processes reported in previous patents, a simpler and more efficient high-temperature acid hydrolysis process is developed. This process can achieve the preparation of rice washing water hydrolysate efficiently and at low cost in a shorter time (no more than 3 hours, preferably 1 hour) using less equipment (a common reactor) and more convenient production operations (without the need to add a large number of microbial combinations and control complex fermentation conditions).

[0022] 2. Different from general fermentation reaction, the technical feature of adopting dilute solution to ensure high yield is that the present invention adopts continuous flow centrifugal collaborative membrane separation technology to achieve solid-liquid separation, desalination and impurity removal, and concentrated essence in one step before the high-temperature acid hydrolysis process, and obtains rice washing water concentrated solution and centrifugal solid. Such processing method can not only retain a large amount of active substances (such as: B vitamins etc.) in rice washing water, reach the ideal goal of 100% utilization of rice washing water waste, but also can ensure that the rice washing water hydrolyzate solution obtained by the subsequent high-temperature acid hydrolysis process is exactly the concentrated solution that can be directly spray-dried, thereby realizing the high efficiency of the rice washing water hydrolyzate preparation process.

[0023] 3. The molecular weight of the rice water hydrolyzate produced by the present invention is less than 5000Da. After testing, its moisture absorption and moisture retention performance is stronger than that of glycerol, and its antioxidant activity is better than that of vitamin E. It can more effectively penetrate the skin and better replenish skin moisture, and is particularly suitable for use in various cosmetics.

[0024] 4. The present invention develops a rice washing water hydrolyzate cosmetic based on the produced rice washing water hydrolyzate; after testing, its moisture absorption and moisture retention performance is better than that of the same type of glycerin cosmetics, and its antioxidant activity is better than that of the same type of vitamin E cosmetics, which also proves that the rice washing water hydrolyzate produced by the present invention is indeed particularly suitable for use in various cosmetics.

[0025] 5. The rice washing water hydrolyzate produced by the present invention is rich in B vitamins. In addition to helping the pigment cells of the hair to produce melanin and help the hair darken, B vitamins are also an essential part of metabolism in the human body and participate in multiple key metabolic reactions. They play an important role in maintaining human health and preventing and treating various diseases. Therefore, the rice washing water hydrolyzate produced by the present invention is particularly suitable as a functional raw material for cosmetics, but can also be directly consumed as a clinical nutritional product, health food, sports food, and carbohydrate nutritional supplement.

[0026] Furthermore, current fermentation methods for producing rice water often use expensive microorganisms such as Bifidobacterium longum, Lactobacillus acidophilus, and Pseudomonas pentosaceus, which are not conducive to large-scale production. The present invention uses inexpensive citric acid, malic acid, or sulfuric acid, which are much less expensive than the microorganisms required for the fermentation reaction. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 The present invention is a process flow chart of a large-scale rapid preparation method of rice washing water hydrolyzate.

[0028] Figure 2 This is the chromatogram of rice washing water stock solution.

[0029] Figure 3 This is the chromatogram of the fermentation products of rice water.

[0030] Figure 4 It is a chromatogram of the hydrolyzate of rice water prepared by the method of the present invention.

[0031] Figure 5 The present invention is a flow chart of the research of the method of rice water hydrolyzate and its cosmetics (taking cosmetic liquid as an example).

[0032] Figure 6 It is the hygroscopic and moisturizing properties of the hydrolyzate of rice washing water (a - hygroscopic properties of the hydrolyzate of rice washing water; b - moisturizing properties of the hydrolyzate of rice washing water) (1 - hydrolyzate of rice washing water; 2 - glycerol; 3 - fermentation product of rice washing water; 4 - original solution of rice washing water).

[0033] Figure 7It is the antioxidant activity of rice washing water hydrolyzate (a-FRAP method to determine the iron ion reduction / antioxidant ability of rice washing water hydrolyzate; b-ABTS method to determine the antioxidant capacity of rice washing water hydrolyzate; c-T-AOC method to determine the total oxidative capacity of rice washing water hydrolyzate; d-Fenton method to determine the hydroxyl free radical content of rice washing water hydrolyzate).

[0034] Figure 8 It is the content of B vitamins in the hydrolyzate of rice washing water (a-vitamin B1 content of the hydrolyzate of rice washing water; b-vitamin B2 content of the hydrolyzate of rice washing water). Among them, the detection method of vitamin B1 content refers to the national standard "Determination of Vitamin B1 in Food" (GB 5009.84-2016); the detection method of vitamin B2 content refers to the national standard "Determination of Vitamin B2 in Food" (GB 5009.85-2016).

[0035] Figure 9 The hygroscopic and moisturizing properties of the rice washing water hydrolyzate cosmetic liquid (a - hygroscopic properties of the rice washing water hydrolyzate cosmetic liquid; b - moisturizing properties of the rice washing water hydrolyzate cosmetic liquid) (1 - rice washing water hydrolyzate (2%) cosmetic liquid; 2 - glycerin (2%) cosmetic liquid; 3 - rice washing water fermentation product (2%) cosmetic liquid; 4 - rice washing water original solution (2%) cosmetic liquid).

[0036] Figure 10 It is the antioxidant activity of the rice washing water hydrolyzate cosmetic liquid (a-FRAP method to determine the iron ion reduction / antioxidant ability of the rice washing water hydrolyzate cosmetic liquid; b-ABTS method to determine the antioxidant ability of the rice washing water hydrolyzate cosmetic liquid; c-T-AOC method to determine the total oxidative capacity of the rice washing water hydrolyzate cosmetic liquid; d-Fenton method to determine the hydroxyl free radical content of the rice washing water hydrolyzate cosmetic liquid). DETAILED DESCRIPTION

[0037] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0038] Example 1:

[0039] A large-scale rapid preparation method of rice water hydrolyzate suitable for cosmetics comprises the following steps:

[0040] (1) Centrifugation and concentration of rice water

[0041] The rice washing water collected after washing rice is first centrifuged at 14000rpm in a continuous flow centrifuge, and the clear liquid obtained by centrifugation is then filtered through a nanofiltration membrane with a relative molecular mass of 200Da to remove small molecular impurities and inorganic salts at a flow rate of 6.5 cubic meters per hour, a membrane pressure of 2.58Mpa, and a temperature of 30°C to obtain a rice washing water concentrate with a concentration of 50%; the solid obtained by centrifugation is collected and set aside.

[0042] (2) High temperature rapid acid hydrolysis reaction

[0043] The rice washing water concentrate and the solid obtained by continuous flow centrifugation were mixed in a weight ratio of 3:1 and added into a reactor. A citric acid solution was added to adjust the pH to 2. The mixture was stirred for 1 hour at a reaction temperature of 85°C. After the reaction was completed, the mixture was cooled to room temperature and a sodium hydroxide solution was added to adjust the pH to 6.5 to obtain a rice washing water hydrolyzate solution with a content of 97.5% and a molecular weight of less than 5000Da.

[0044] (3) Rapid drying and sterilization packaging

[0045] The rice washing water hydrolyzate solution was quickly dried by spray drying, with the inlet air temperature set at 160°C and the outlet air temperature set at 90°C to obtain a rice washing water hydrolyzate powder; the rice washing water hydrolyzate powder was then quickly sterilized by γ-ray radiation with a radiation dose of 10 kGy and a radiation time of 20 minutes, and finally aseptically packaged.

[0046] Example 2:

[0047] A large-scale rapid preparation method of rice water hydrolyzate suitable for cosmetics comprises the following steps:

[0048] (1) Centrifugation and concentration of rice water

[0049] The rice water collected after washing rice is first centrifuged at 13500rpm in a continuous flow centrifuge, and the clear liquid obtained by centrifugation is then filtered through a nanofiltration membrane with a relative molecular mass of 500Da to remove small molecular impurities and inorganic salts at a flow rate of 8 cubic meters per hour, a membrane pressure of 2.25Mpa, and a temperature of 35°C to obtain a rice water concentrate with a concentration of 30%; the solid obtained by centrifugation is collected and set aside.

[0050] (2) High temperature rapid acid hydrolysis reaction

[0051] The rice washing water concentrate and the solid obtained by continuous flow centrifugation were mixed in a weight ratio of 1:1 and added into a reactor. A dilute sulfuric acid solution was added to adjust the pH to 2.5. The reaction was stirred for 2.5 hours at 90°C. After the reaction was completed, the temperature was lowered to room temperature and potassium hydroxide solution was added to adjust the pH to 7.5 to obtain a rice washing water hydrolyzate solution with a content of 98% and a molecular weight of less than 5000Da.

[0052] (3) Rapid drying and sterilization packaging

[0053] The rice washing water hydrolyzate solution was quickly dried by spray drying, with the inlet air temperature set at 165°C and the outlet air temperature set at 92°C to obtain a rice washing water hydrolyzate powder; the rice washing water hydrolyzate powder was then quickly sterilized by electron beam irradiation with a radiation dose of 10 kGy and an irradiation time of 45 minutes, and finally aseptically packaged.

[0054] Example 3:

[0055] A large-scale rapid preparation method of rice water hydrolyzate suitable for cosmetics comprises the following steps:

[0056] (1) Centrifugation and concentration of rice water

[0057] The rice washing water collected after washing rice is first centrifuged at 12000rpm in a continuous flow centrifuge, and the clear liquid obtained by centrifugation is then filtered through a nanofiltration membrane with a relative molecular mass of 200Da to remove small molecular impurities and inorganic salts. The flow rate is 5 cubic meters per hour, the membrane pressure is 2.75Mpa, and the temperature is 35°C. The rice washing water concentrate is concentrated to a concentration of 40%; the solid obtained by centrifugation is collected and set aside.

[0058] (2) High temperature rapid acid hydrolysis reaction

[0059] The rice washing water concentrate and the solid obtained by continuous flow centrifugation were mixed in a weight ratio of 3:1 and added into a reactor. Malic acid solution was added to adjust the pH to 3.0. The mixture was stirred for 3.0 hours at a reaction temperature of 100°C. After the reaction was completed, the mixture was cooled to room temperature and sodium bicarbonate solution was added to adjust the pH to 6.5 to obtain a rice washing water hydrolyzate solution with a content of 96.8% and a molecular weight of less than 5000Da.

[0060] (3) Rapid drying and sterilization packaging

[0061] The rice washing water hydrolyzate solution was quickly dried by spray drying, with the inlet air temperature set at 150°C and the outlet air temperature set at 85°C to obtain a rice washing water hydrolyzate powder; the rice washing water hydrolyzate powder was then quickly sterilized by ultraviolet radiation with a radiation dose of 5 kGy and a radiation time of 60 minutes, and finally aseptically packaged.

[0062] like Figure 1As shown, the present invention firstly centrifuges the rice washing water collected after washing rice with a continuous flow centrifuge at high speed, removes small molecular impurities and inorganic salts from the clear liquid obtained by centrifugation with a nanofiltration membrane, and further concentrates it to obtain a rice washing water concentrate; then, the solid obtained by centrifugation is mixed with the rice washing water concentrate, and the mixture is subjected to a high-temperature rapid acid hydrolysis reaction to obtain a rice washing water hydrolyzate solution with a content of ≥95% and a molecular weight of less than 5000 Daltons (Da); finally, the rice washing water hydrolyzate powder is quickly dried by a spray drying technology, and then the rice washing water hydrolyzate powder is quickly sterilized and sealed for storage by light radiation technology.

[0063] As shown in Table 1, the high-temperature rapid acid hydrolysis reaction involved in the present invention only requires a common reactor to complete the preparation of the rice washing water hydrolyzate, while the fermentation reaction disclosed by other patents requires a complicated seed tank plus a fermentation tank; Meanwhile, the time of the fermentation reaction is generally longer (such as: 60 hours), and the reaction time of the present invention only needs 1 hour to complete; Moreover, the fermentation reaction only has microorganisms (combination) to participate and obtain the desired fermentation product under suitable fermentation conditions, while the reaction of the present invention does not have the harsh requirements in this regard. This shows that the process technology of the present invention has higher efficiency and lower cost relative to other patents, and is more suitable for large-scale production.

[0064] like Figure 2 、 Figure 3 、 Figure 4 As shown in Table 2, compared with the rice washing water stock solution, only 31.36% of the molecular weight distribution is below 5000Da, and the rice washing water fermentation product prepared by fermentation technology has 62.72% of the molecular weight distribution below 5000Da. However, the rice washing water hydrolyzate prepared by the method of the present invention has a molecular weight distribution of up to 99.80% below 5000Da. This shows that the rice washing water hydrolyzate of the present invention is a mixture of small molecule sugars, small peptides and various active substances with a more concentrated molecular weight distribution relative to the rice washing water stock solution and the rice washing water fermentation product. They can more effectively penetrate the skin, better replenish skin moisture, and are particularly suitable for use in various cosmetics.

[0065] like Figure 5 As shown, the present invention prepared a rice washing water hydrolyzate cosmetic liquid based on the rice washing water hydrolyzate, and conducted research on its moisture absorption and moisturizing properties and antioxidant activity.

[0066] like Figure 6 As shown, compared with the rice washing water fermentation product and the rice washing water stock solution, the moisture absorption and moisturizing properties of the rice washing water hydrolyzate are as follows from strong to weak: rice washing water hydrolyzate (prepared by the method of the present invention) > glycerol > rice washing water fermentation product > rice washing water stock solution.

[0067] like Figure 7As shown in the figure, the antioxidant activities of rice washing water hydrolyzate, rice washing water fermentation product and rice washing water stock solution were determined by four antioxidant activity determination methods with different mechanisms (FRAP method, ABTS method, T-AOC method and Fenton method), and their results were basically consistent; their antioxidant activities were in the following order from strong to weak: rice washing water hydrolyzate (prepared by the method of the present invention) > vitamin E > rice washing water fermentation product > rice washing water stock solution.

[0068] like Figure 8 As shown, the content of B vitamins (vitamin B1 and vitamin B2) in the rice washing water hydrolyzate, the rice washing water fermentation product and the rice washing water stock solution are basically the same; the order of B vitamin content from strong to weak is: rice washing water hydrolyzate (prepared by the method of the present invention) > rice washing water stock solution > rice washing water fermentation product.

[0069] like Figure 9 As shown, after the rice washing water hydrolyzate (2%) is added to the cosmetic liquid, the moisture absorption and moisturizing properties are better than the glycerin cosmetic liquid (2%), rice washing water fermentation product cosmetic liquid (2%) and rice washing water original liquid cosmetic liquid (2%) with the same content.

[0070] like Figure 10 As shown, four antioxidant activity detection methods with different mechanisms (FRAP method, ABTS method, T-AOC method and Fenton method) were used to determine the antioxidant activities of rice washing water hydrolyzate cosmetic liquid (2%), rice washing water fermentation product cosmetic liquid (2%), and rice washing water original solution cosmetic liquid (2%), and their results were basically consistent; their antioxidant activities were in the following order from strong to weak: rice washing water hydrolyzate cosmetic liquid (2%) (prepared by the method of the present invention) > vitamin E cosmetic liquid (2%) > rice washing water fermentation product cosmetic liquid (2%) > rice washing water original solution cosmetic liquid (2%).

[0071] Table 1: Comparison of the preparation technology of rice washing water fermentation products and rice washing water hydrolyzate (prepared by the present invention).

[0072]

[0073] Table 2: Comparison of molecular weight distribution of rice washing water hydrolyzate, rice washing water stock solution and rice washing water fermentation product prepared by the method of the present invention.

[0074]

[0075]

Claims

1. A large-scale rapid preparation method of rice water hydrolysate suitable for cosmetics, characterized in that: The following steps are involved: (1) Centrifugation and concentration of rice water The rice water collected after washing rice is first centrifuged at high speed in a continuous flow centrifuge, and the resulting supernatant is then filtered through a nanofiltration membrane with a relative molecular mass of 500Da to 200Da to remove small molecular impurities and inorganic salts, and further concentrated to obtain a rice water concentrate with a concentration of 30% to 50%; the solid obtained by centrifugation is collected and set aside; the high-speed centrifugation speed of the continuous flow centrifuge is 10,000 to 15,000 rpm; the nanofiltration membrane with a relative molecular mass of 500Da to 200Da is used at a flow rate of 5 to 14 cubic meters per hour, a membrane pressure of 0.483 to 2.758 MPa, and a temperature of 20 to 50°C; (2) High temperature rapid acid hydrolysis reaction The rice washing water concentrate and the solid obtained by continuous flow centrifugation are mixed in an appropriate weight ratio and then added into a reactor, an acid solution is added to adjust the pH to 2-3, and the reaction is stirred for 0.5-3 hours at a reaction temperature of 80-100° C. After the reaction is completed, the temperature is lowered to room temperature, and an alkali solution is added to adjust the pH to 5.5-7.5 to obtain a rice washing water hydrolyzate solution with a content of ≥95% and a molecular weight of less than 5000 Da; the rice washing water concentrate and the solid obtained by continuous flow centrifugation are mixed in a weight ratio of 5:1-1:1; the acid used to adjust the pH value of the acid solution is citric acid, malic acid or sulfuric acid; the alkali used to adjust the pH value of the alkali solution is sodium bicarbonate, potassium bicarbonate, sodium hydroxide or potassium hydroxide; (3) Rapid drying and sterilization packaging: The rice washing water hydrolyzate solution is rapidly dried by spray drying to obtain the rice washing water hydrolyzate powder, which is then rapidly sterilized by light radiation and finally aseptically packaged; the inlet air temperature of the spray drying used is 120-180°C and the outlet air temperature is 70-95°C; the light radiation used is ultraviolet radiation, γ-ray or electron beam radiation, the radiation dose is 0.01-40 kGy, and the radiation time is 1-60 minutes.

2. A rice water hydrolyzate suitable for cosmetics, characterized in that The rice water hydrolyzate suitable for cosmetics is prepared according to the large-scale rapid preparation method of claim 1.

3. A cosmetic, characterized in that: The rice washing water hydrolyzate according to claim 2 contains 0.01% to 99% by weight.

4. The cosmetic according to claim 3, wherein the cosmetic comprises at least one of lotion, cosmetic cream and cosmetic emulsion.

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