阅读说明：本技术 一种复合植物小肽豆奶粉的生产方法 (Production method of composite plant small peptide soybean milk powder ) 是由 杜以波 贺来战 潘坤峰 于 2021-03-09 设计创作，主要内容包括：本发明提供了一种复合植物小肽豆奶粉的生产方法,涉及复合植物小肽豆奶粉制备技术,属于生物技术。通过将鹰嘴豆、花生仁、大豆青豆仁、元宝枫子仁制浆,并经超声提取、离心过滤后得到提取液和仁渣,再将仁渣酶解后所得酶解过滤液与上述提取液混合均质得到复合植物小肽豆奶液,再经干燥、筛分后得到小肽豆奶粉产品。利用原材料含有大量蛋白质和丰富的营养的特性,制成复合植物小肽豆奶粉,含有丰富的蛋白质、小肽、不饱和脂肪酸、大豆卵磷脂、大豆异黄酮、NMN(β-烟酰胺单核苷酸)、神经酸、DHA、碳水化合物、维生素、矿物质等,没有豆腥味,可以替代牛奶,甚至比牛奶营养更好的植物奶粉。(The invention provides a production method of composite plant small peptide soybean milk powder, relates to a preparation technology of composite plant small peptide soybean milk powder, and belongs to the biotechnology. The method comprises the steps of pulping chickpea, peanut kernels, soybean green bean kernels and acer truncatum kernels, carrying out ultrasonic extraction and centrifugal filtration to obtain an extracting solution and kernel residues, carrying out enzymolysis on the kernel residues to obtain an enzymolysis filtering solution, mixing the enzymolysis filtering solution with the extracting solution, homogenizing to obtain a composite plant small peptide soymilk liquid, drying and screening to obtain a small peptide soymilk powder product. The raw materials are utilized to contain a large amount of protein and rich nutrition, so that the composite plant small peptide soybean milk powder is prepared, contains rich protein, small peptide, unsaturated fatty acid, soybean lecithin, soybean isoflavone, NMN (beta-nicotinamide mononucleotide), nervonic acid, DHA, carbohydrate, vitamins, minerals and the like, has no beany flavor, can replace milk, and even is plant milk powder with better nutrition than milk.)

1. A production method of composite plant small peptide soybean milk powder is characterized in that: the method comprises the steps of pulping chickpea, peanut kernels, soybean green bean kernels and acer truncatum kernels, carrying out ultrasonic extraction and centrifugal filtration to obtain an extracting solution and kernel residues, carrying out enzymolysis on the kernel residues to obtain an enzymolysis filtering solution, mixing the enzymolysis filtering solution with the extracting solution, homogenizing to obtain a composite plant small peptide soymilk liquid, drying and screening to obtain a small peptide soymilk powder product.

2. The method for producing the composite plant small peptide soymilk powder according to claim 1, which is characterized in that: comprises the step of preparing the kernel paste,

(1) preparing germinated peeled chickpeas: soaking the chickpeas in water for at least 10 hours, then draining for 4 hours, then soaking in warm water at 30 ℃ for 3-5 hours, and repeating the steps for 3 times. When the chickpea sprouts grow to 3-5 mm and the bean skins can be basically separated from the chickpeas easily, a mild crusher is used to separate the bean skins from the beans and the bean skins are fished out;

(2) preparing wet peanut kernels: soaking peanut kernels in warm water for at least 10 hours;

(3) preparing soybean and green bean kernels: peeling green soybean pod to leave green soybean kernel;

(4) preparing Acer truncatum seeds: removing shell of Acer truncatum Bunge seed, and keeping kernel;

(5) preparing kernel pulp: mixing germinated peeled semen Ciceris Arietini, wet semen Arachidis Hypogaeae, semen glycines semen Phaseoli Radiati, and Acer Truncatum seed with 3 times of water, grinding into slurry with colloid mill, and repeatedly grinding twice.

3. The method for producing the composite plant small peptide soymilk powder according to claim 1, which is characterized in that: comprises the following steps of ultrasonic extraction of kernel pulp:

ultrasonic extraction equipment is adopted, and ultrasonic extraction is carried out for 3 hours at the temperature of 30-70 ℃ and 20000-50000 HZ; filtering the extract with a high-speed centrifuge to obtain ultrasonic extract of kernel pulp for later use; the filtered cake and dregs, i.e. kernel dregs.

4. The method for producing the composite plant small peptide soymilk powder according to claim 1, which is characterized in that: comprises the step of enzymolysis of kernel dregs,

adding 2 times of water into the kernel residues, placing the slurry in a reaction kettle, adjusting the pH value to be 9-10 by using sodium carbonate, adjusting the pH value to be 50-55 ℃, adding alkaline protease accounting for 1-2% of the weight of all the kernel residues, and stirring for 3 hours; adding neutral protease accounting for 1-3% of the weight of the kernel residues, papain accounting for 1-3% of the weight of the kernel residues and bromelain accounting for 1-3% of the weight of the kernel residues, and reacting for 8 hours at 50 ℃; adjusting the pH value to 4.5-5 by using hydrochloric acid, reacting for 8 hours at 70 ℃, heating to 95 ℃ for 10 minutes, and inactivating enzyme; separation and filtration: separating out the residue by using a butterfly centrifugal filter, and collecting the filtrate.

5. The method for producing the composite plant small peptide soymilk powder according to claim 1, which is characterized in that: comprises the step of mixing and homogenizing,

mixing the kernel pulp extract obtained in the claim 3 with the enzymolysis filtrate obtained in the claim 4, homogenizing by a homogenizing device, heating to 95 ℃, sterilizing for 10 minutes, and cooling to 50 ℃ to obtain the compound plant small peptide soymilk liquid.

6. The method for producing the composite plant small peptide soymilk powder according to claim 1, which is characterized in that: the drying is to spray-dry the composite plant small peptide soymilk liquid by a spray-drying tower, wherein the feeding temperature of the drying tower is 160-180 ℃, and the discharging temperature is 90-110 ℃, so as to obtain the composite plant small peptide soymilk coarse powder.

7. The method for producing the composite plant small peptide soymilk powder according to claim 1, which is characterized in that: and in the screening step, the dried soybean milk coarse powder is screened by adopting a 60-mesh ultrasonic vibration screen, and the powder passing through the 60-mesh screen is collected to obtain the compound plant small peptide soybean milk powder product.

8. The method for producing the composite plant small peptide soybean milk powder of any one of claims 1 to 8, which is characterized in that: the obtained composite plant small peptide soybean milk powder contains 49.6-51.5 percent of protein, 22-25 percent of small peptide in protein, 14.8-15.8 percent of fat, 61-66 percent of unsaturated fatty acid, 2.2-2.9 percent of soybean lecithin, 0.15-0.21 percent of soybean isoflavone, 0.1-0.12 percent of NMN, 0.2-0.25 percent of nervonic acid, 0.28-0.31 percent of DHA and 90-112 mg/100g of VC.

Technical Field

The invention relates to a preparation technology of compound plant small peptide soybean milk powder, belonging to the biotechnology.

Background

Plant milk is becoming a trend. With the increasing consumer interest in plant substitutes, in recent years, plant milks made from soybeans, coconut, oats, almonds, etc. have been occupying the dairy market in short time to masking ears. According to the data of Eurui International, the retail sales of American traditional milk is expected to decrease by 1.2% in 2018, while alternatives such as oat and almond are expected to increase by 3%. The plant milk is slightly favored by large companies.

The plant milk is beverage prepared from plant seed (such as semen glycines, semen Juglandis, semen Arachidis Hypogaeae, herba Avenae Fatuae, etc.) or fruit (such as coconut, etc.) containing protein and fat. Research shows that the main raw materials of the plant milk comprise oat, rice, Chinese chestnut, soybean, almond, hazelnut and the like, so that the plant milk contains certain vitamins, dietary fibers and mineral substances.

Plant milk also has own "star", such as soymilk which contains high-quality plant protein, fat and vitamins, and the contents of lecithin and vitamin E are higher than those of cow milk, so that the long-term drinking of the plant milk can regulate blood fat, protect liver and prevent angiosclerosis. The soybean contains isoflavone which is a trace component, and has health-care effects of preventing cancer and osteoporosis. In addition, soy milk is available in a variety of forms, and when added to tea or coffee for drinking, it is thick and non-freezing.

The market share occupied by plant milk is expanding and the consumer population is increasing. The popular reasons of the plant milk are as follows: functional benefits and special taste. Many people choose vegetable milk because of the health and nutritional value provided by vegetable dairy products, such as low calories, high protein, abundant vitamins, which are of interest to consumers. The research institute intemet also recognized that vegetable milk "functional benefits" and "special taste mouthfeel" were the primary reasons for its popularity. Vegetable milk is "less fatty" or "more fibrous," has no cowy of milk, "is environmentally friendly," has less carbon emissions, "and is more ethical from animal welfare considerations.

The soybean milk is homogenized under high pressure to change protein, oil and fat, phospholipid and the like into fine and uniform solid dispersion and liquid emulsion, and the soybean milk is sterilized at high temperature and the like, so that the nutrient substances are more absorbable and have longer shelf life. Has more advantages than soybean milk.

Consumer surveys show that young people (< 45 years) and women, milk protein allergy, lactose intolerance (diarrhea, flatulence and other symptoms), vegetarians and absolute vegetarians are more inclined to buy 'plant milk';

however, milk is rich in protein and is a high-quality protein, and whey protein and casein are highly absorbable. Fat is mainly saturated fat, but contains unsaturated fat and cholesterol. But also is a source of high-quality calcium and vitamin D. No matter how the plant milk is used for playing the 'nutrition' brand, the plant milk is difficult to replace milk, especially for children.

The chickpea is rich in various high-quality proteins, fats, amino acids, vitamins, dietary fibers, various trace elements such as calcium, magnesium, iron, zinc, phosphorus and the like, has high nutritional value and has various functional activities. Peanut contains rich protein, fat, saccharide, vitamin A, vitamin B6, vitamin E, vitamin K, mineral calcium, phosphorus, iron and other nutrients, 8 kinds of amino acids and unsaturated fatty acids essential for human body, lecithin, choline, carotene, coarse fiber and other matters.

The peanut contains rich protein, common minor cereals contain less choline, lecithin and DHA, and can promote metabolism of human body, enhance memory, promote intelligence development, resist aging and prolong life.

The green beans are rich in protein and dietary fiber, saponin, isoflavone, flavonoid antioxidant catechin and epicatechin, soybean lecithin, vitamin A, vitamin C and vitamin K, vitamin B, alpha-carotene and beta-carotene, thiamine and riboflavin, and can also provide a small amount of calcium, phosphorus, potassium, iron, zinc, molybdenum, selenium and other elements, the green beans are natural plants with the highest NMN (beta-nicotinamide mononucleotide) content, and the NMN is a key substance for prolonging the cell life.

The acer truncatum seed kernel contains protein, has oil content of over 48 percent, contains unsaturated fatty acid content of over 90 percent, is rich in vitamin E, can protect cells against oxidative stress reaction caused by free radicals, and improves cognitive function. Particularly rich in nervonic acid, and the nervonic acid can completely permeate blood brain barrier to repair damaged nerve fibers, smooth brain paths, repair aged and damaged and hardened cardiovascular and cerebrovascular walls, restore blood vessel elasticity and regulate blood fat. The acer truncatum seed oil has the advantages of combined medication, and particularly has important deep development value for preventing and treating serious diseases of the nervous system.

Disclosure of Invention

The invention aims to provide a method for producing composite plant small peptide soymilk which can replace milk. The soybean milk obtained by the method is rich in protein, small peptide, unsaturated fatty acid, soybean lecithin, soybean isoflavone, NMN (beta-nicotinamide mononucleotide), nervonic acid, DHA, carbohydrate and vitamin, has high nutrient content, is easy to absorb, is relatively rich and complete in nutrition, does not have beany flavor, and can replace milk.

In order to achieve the purpose, chickpea, peanuts, soybean green beans and acer truncatum seeds are used as main protein sources, the main protein is converted into small peptides through an enzymolysis method, all reaction liquid is homogenized and emulsified, and the small peptides are sprayed and dried to prepare the composite plant small peptide soybean milk powder.

The technical scheme adopted by the invention is as follows:

a production method of compound plant small peptide soymilk powder comprises the steps of pulping chickpea, peanut kernels, soybean green bean kernels and acer truncatum seeds, carrying out ultrasonic extraction and centrifugal filtration to obtain an extracting solution and kernel residues, carrying out enzymolysis on the kernel residues to obtain an enzymolysis filtering solution, mixing the enzymolysis filtering solution with the extracting solution to homogenize to obtain a compound plant small peptide soymilk liquid, drying and screening to obtain a small peptide soymilk powder product.

The specific method comprises the following steps:

(1) preparing germinated peeled chickpeas: soaking the chickpeas in water for at least 10 hours, then draining for 4 hours, then soaking in warm water at 30 ℃ for 3-5 hours, and repeating the steps for 3 times. When the chickpea sprouts grow to 3-5 mm and the bean skins can be basically separated from the chickpeas easily, a mild crusher is used to separate the bean skins from the beans and the bean skins are fished out;

(2) preparing wet peanut kernels: soaking peanut kernels in warm water for at least 10 hours;

(3) preparing soybean and green bean kernels: peeling green soybean pod to leave green soybean kernel;

(4) preparing Acer truncatum seeds: removing shell of Acer truncatum Bunge seed, and keeping kernel;

(5) preparing kernel pulp: mixing germinated peeled semen Ciceris Arietini, wet semen Arachidis Hypogaeae, semen glycines semen Phaseoli Radiati, and Acer Truncatum seed with 3 times of water, grinding into slurry with colloid mill, and repeatedly grinding twice;

(6) ultrasonic extraction of kernel pulp: ultrasonic extraction equipment is adopted, and ultrasonic extraction is carried out for 3 hours at the temperature of 30-70 ℃ and 20000-50000 HZ; filtering the extract with a high-speed centrifuge to obtain ultrasonic extract of kernel pulp for later use; filtering the filter cake and dregs, namely kernel dregs, for later use;

(7) enzymolysis of kernel dregs: adding 2 times of water into the kernel residues, placing the slurry in a reaction kettle, adjusting the pH value to be 9-10 by using sodium carbonate, adjusting the pH value to be 50-55 ℃, adding alkaline protease accounting for 1-2% of the weight of all the kernel residues, and stirring for 3 hours; adding neutral protease accounting for 1-3% of the weight of the kernel residues, papain accounting for 1-3% of the weight of the kernel residues and bromelain accounting for 1-3% of the weight of the kernel residues, and reacting for 8 hours at 50 ℃; adjusting the pH value to 4.5-5 by using hydrochloric acid, reacting for 8 hours at 70 ℃, heating to 95 ℃ for 10 minutes, and inactivating enzyme; separation and filtration: separating out residues by adopting a butterfly centrifugal filter, and collecting filtrate; drying and recycling residues; carrying out enzymolysis on the filtrate for later use;

(8) and (3) mixing the kernel pulp filtrate obtained in the step (6) with the enzymolysis filtrate obtained in the step (7), homogenizing by using homogenizing equipment, heating to 95 ℃, sterilizing for 10 minutes, and cooling to 50 ℃ to obtain the compound plant small peptide soymilk liquid.

(9) Spray drying: spray drying the composite plant soymilk liquid by adopting a spray drying tower, wherein the feeding temperature of the drying tower is 160-180 ℃, and the discharging temperature is 90-110 ℃, so as to obtain composite plant small peptide soymilk coarse powder;

(10) screening: screening the obtained powder by adopting a 60-mesh ultrasonic vibration sieve, and collecting the powder which passes through the 60-mesh sieve to obtain the compound plant small peptide soybean milk powder;

the invention has the beneficial effects that:

the invention provides a method for producing composite plant small peptide soymilk, which utilizes the characteristics of raw materials containing a large amount of protein and rich nutrition to prepare the composite plant small peptide soymilk powder, and the composite plant small peptide soymilk is soymilk which contains rich protein, small peptide, unsaturated fatty acid, soybean lecithin, soybean isoflavone, NMN (beta-nicotinamide mononucleotide), nervonic acid, DHA, carbohydrate and vitamin, has high nutrient content, is easy to absorb, has relatively rich and complete nutrition, does not have beany flavor, and can replace milk.

The product of the invention is detected according to corresponding methods and steps of the industry standard SB/T10021 gel candy, and the indexes meet the standard requirements.

Detailed Description

The following detailed description of the embodiments provided according to the present invention is given with reference to the following examples:

example 1

A method for producing composite plant small peptide soybean milk capable of replacing milk. The method comprises the following steps:

(1) preparing germinated peeled chickpeas: soaking chickpeas 100kg in water for 12 hours, draining for 4 hours, soaking in warm water at 30 deg.C for 4 hours, and repeating the above steps for 3 times. When the chickpea sprouts grow to 3-5 mm and the bean skins can be basically separated from the chickpeas easily, a mild crusher is used to separate the bean skins from the beans and the bean skins are fished out;

(2) preparing wet peanut kernels: soaking 50kg of peanut kernels in warm water for 12 hours;

(3) preparing 50kg of soybean and green bean kernels: peeling green soybean pod to leave green soybean kernel;

(4) preparing 20kg of acer truncatum seeds: removing shell of Acer truncatum Bunge seed, and keeping kernel;

(5) preparing kernel pulp: mixing germinated peeled semen Ciceris Arietini, wet semen Arachidis Hypogaeae, semen glycines semen Phaseoli Radiati, and Acer Truncatum seed with 3 times of water, grinding into slurry with colloid mill, and repeatedly grinding twice;

(6) ultrasonic extraction of kernel pulp: ultrasonic extraction equipment is adopted, the temperature is 50 ℃,20000HZ is adopted, and ultrasonic extraction is carried out for 3 hours; filtering the extract with a high-speed centrifuge to obtain ultrasonic extract of kernel pulp for later use; filtering the filter cake and dregs, namely kernel dregs, for later use;

(7) enzymolysis of kernel dregs: adding 3 times of water into the kernel residues, placing the slurry in a reaction kettle, adjusting the pH value to 9.5 by using sodium carbonate, adding alkaline protease accounting for 1 percent of the weight of all the kernel residues at 55 ℃, and stirring for 3 hours; adding neutral protease 2% of the weight of the kernel dregs, papain 2% and bromelain 1%, and reacting at 50 ℃ for 8 hours; adjusting pH to 4.6 with hydrochloric acid, reacting at 70 deg.C for 8 hr, heating to 95 deg.C for 10 min, and deactivating enzyme; separation and filtration: separating out residues by adopting a butterfly centrifugal filter, and collecting filtrate; drying and recycling residues; carrying out enzymolysis on the filtrate for later use;

(8) and (3) mixing the kernel pulp filtrate obtained in the step (6) with the enzymolysis filtrate obtained in the step (7), homogenizing for 30 minutes by using homogenizing equipment, heating to 95 ℃, sterilizing for 10 minutes, and cooling to 50 ℃ to obtain the composite plant small peptide soymilk liquid.

(9) Spray drying: spray drying the composite plant soymilk liquid by adopting a spray drying tower, wherein the feeding temperature of the drying tower is 180 ℃, and the discharging temperature is 98 ℃ to obtain composite plant small peptide soymilk coarse powder;

(10) screening: and screening the obtained powder by adopting a 60-mesh ultrasonic vibration sieve, and collecting the powder which passes through the 60-mesh sieve to obtain the compound plant small peptide soybean milk powder.

The detection indexes of the product of the embodiment are as follows: 51.5% of protein, 22% of small peptide in protein, 15.5% of fat, 62% of unsaturated fatty acid, 2.2% of soybean lecithin, 0.15% of soybean isoflavone, 0.1% of NMN, 0.2% of nervonic acid, 0.3% of DHA and 100mg/100g of VC.

Example 2

A method for producing composite plant small peptide soybean milk capable of replacing milk. The method comprises the following steps:

(1) preparing germinated peeled chickpeas: soaking chickpea 100kg in water for 10 hr, draining for 4 hr, soaking in 30 deg.C warm water for 5 hr, and repeating the above steps for 3 times. When the chickpea sprouts grow to 3-5 mm and the bean skins can be basically separated from the chickpeas easily, a mild crusher is used to separate the bean skins from the beans and the bean skins are fished out;

(2) preparing wet peanut kernels: soaking 50kg of peanut kernels in warm water for 10 hours;

(3) preparing 50kg of soybean and green bean kernels: peeling green soybean pod to leave green soybean kernel;

(4) preparing 20kg of acer truncatum seeds: removing shell of Acer truncatum Bunge seed, and keeping kernel;

(5) preparing kernel pulp: mixing germinated peeled semen Ciceris Arietini, wet semen Arachidis Hypogaeae, semen glycines semen Phaseoli Radiati, and Acer Truncatum seed with 3 times of water, grinding into slurry with colloid mill, and repeatedly grinding twice;

(6) ultrasonic extraction of kernel pulp: ultrasonic extraction equipment is adopted, the temperature is 70 ℃,30000HZ is adopted, and the ultrasonic extraction is carried out for 3 hours; filtering the extract with a high-speed centrifuge to obtain ultrasonic extract of kernel pulp for later use; filtering the filter cake and dregs, namely kernel dregs, for later use;

(7) enzymolysis of kernel dregs: adding 3 times of water into the kernel residues, placing the slurry in a reaction kettle, adjusting the pH value to 10 by using sodium carbonate, adding alkaline protease accounting for 2 percent of the weight of all the kernel residues at 50 ℃, and stirring for 3 hours; adding neutral protease 1 wt% of kernel dregs, papain 1 wt% and bromelain 2 wt%, and reacting at 50 deg.C for 8 hr; adjusting pH to 4.5 with hydrochloric acid, reacting at 70 deg.C for 8 hr, heating to 95 deg.C for 10 min, and deactivating enzyme; separation and filtration: separating out residues by adopting a butterfly centrifugal filter, and collecting filtrate; drying and recycling residues; carrying out enzymolysis on the filtrate for later use;

(8) and (3) mixing the kernel pulp filtrate obtained in the step (6) with the enzymolysis filtrate obtained in the step (7), homogenizing for 30 minutes by using homogenizing equipment, heating to 95 ℃, sterilizing for 10 minutes, and cooling to 50 ℃ to obtain the composite plant small peptide soymilk liquid.

(9) Spray drying: spray drying the composite plant soymilk liquid by adopting a spray drying tower, wherein the feeding temperature of the drying tower is 160 ℃, and the discharging temperature is 110 ℃, so as to obtain composite plant small peptide soymilk coarse powder;

(10) screening: and screening the obtained powder by adopting a 60-mesh ultrasonic vibration sieve, and collecting the powder which passes through the 60-mesh sieve to obtain the compound plant small peptide soybean milk powder.

The detection indexes of the product of the embodiment are as follows: 49% of protein, 25% of small peptide in protein, 14.8% of fat, 66% of unsaturated fatty acid, 2.3% of soybean lecithin, 0.21% of soybean isoflavone, 0.12% of NMN, 0.23% of nervonic acid, 0.31% of DHA and 90mg/100g of VC.

Example 3

A method for producing composite plant small peptide soybean milk capable of replacing milk. The method comprises the following steps:

(1) preparing germinated peeled chickpeas: soaking chickpeas 100kg in water for 14 hours, draining for 4 hours, soaking in warm water at 30 deg.C for 3 hours, and repeating the above steps for 3 times. When the chickpea sprouts grow to 3-5 mm and the bean skins can be basically separated from the chickpeas easily, a mild crusher is used to separate the bean skins from the beans and the bean skins are fished out;

(2) preparing wet peanut kernels: soaking 50kg of peanut kernels in warm water for 14 hours;

(3) preparing 50kg of soybean and green bean kernels: peeling green soybean pod to leave green soybean kernel;

(4) preparing 20kg of acer truncatum seeds: removing shell of Acer truncatum Bunge seed, and keeping kernel;

(5) preparing kernel pulp: mixing germinated peeled semen Ciceris Arietini, wet semen Arachidis Hypogaeae, semen glycines semen Phaseoli Radiati, and Acer Truncatum seed with 3 times of water, grinding into slurry with colloid mill, and repeatedly grinding twice;

(6) ultrasonic extraction of kernel pulp: ultrasonic extraction equipment is adopted, the temperature is 30 ℃,50000HZ, and ultrasonic extraction is carried out for 3 hours; filtering the extract with a high-speed centrifuge to obtain ultrasonic extract of kernel pulp for later use; filtering the filter cake and dregs, namely kernel dregs, for later use;

(7) enzymolysis of kernel dregs: adding 3 times of water into the kernel dregs, placing the slurry in a reaction kettle, adjusting the pH value to 9 by using sodium carbonate, adding alkaline protease accounting for 1 percent of the weight of all the kernel dregs at 53 ℃, and stirring for 3 hours; adding neutral protease 3% of the weight of the kernel dregs, papain 3% and bromelain 3%, and reacting at 50 ℃ for 8 hours; adjusting pH to 5.0 with hydrochloric acid, reacting at 70 deg.C for 8 hr, heating to 95 deg.C for 10 min, and deactivating enzyme; separation and filtration: separating out residues by adopting a butterfly centrifugal filter, and collecting filtrate; drying and recycling residues; carrying out enzymolysis on the filtrate for later use;

(8) and (3) mixing the kernel pulp filtrate obtained in the step (6) with the enzymolysis filtrate obtained in the step (7), homogenizing for 30 minutes by using homogenizing equipment, heating to 95 ℃, sterilizing for 10 minutes, and cooling to 50 ℃ to obtain the composite plant small peptide soymilk liquid.

(9) Spray drying: spray drying the composite plant soymilk liquid by adopting a spray drying tower, wherein the feeding temperature of the drying tower is 170 ℃, and the discharging temperature is 90 ℃, so as to obtain composite plant small peptide soymilk coarse powder;

(10) screening: and screening the obtained powder by adopting a 60-mesh ultrasonic vibration sieve, and collecting the powder which passes through the 60-mesh sieve to obtain the compound plant small peptide soybean milk powder.

The detection indexes of the product of the embodiment are as follows: 49.6 percent of protein, 25 percent of small peptide in the protein, 15.8 percent of fat, 61 percent of unsaturated fatty acid, 2.9 percent of soybean lecithin, 0.15 percent of soybean isoflavone, 0.12 percent of NMN, 0.25 percent of nervonic acid, 0.28 percent of DHA and 112mg/100g of VC.

According to the embodiments, chickpeas, peanuts, soybean green beans and acer truncatum seeds are used as main protein sources, the main protein is converted into small peptides through an enzymolysis method, all reaction liquid is homogenized and emulsified, and the small peptides are prepared into the composite plant small peptide soybean milk powder through spray drying. The compound plant small peptide soymilk powder prepared by utilizing the characteristics of large amount of protein and rich nutrition in raw materials is soymilk which contains rich protein, small peptide, unsaturated fatty acid, soybean lecithin, soybean isoflavone, NMN (beta-nicotinamide mononucleotide), nervonic acid, DHA, carbohydrate and vitamin, has high nutrient content, is easy to absorb, has relatively rich and complete nutrition, has no beany flavor, and can replace milk. The method of the invention is scientific, reasonable, simple and efficient, and the product has good health care effect on human body. It should be further understood that the above embodiments are not intended to limit the technical solutions of the present invention, and modifications that belong to the technical concepts described above and are obvious in the technical solutions of the present invention shall fall within the protection scope of the present invention.