阅读说明：本技术 一种鲟鱼蛋白肽粉及其制备方法与应用 (Sturgeon protein peptide powder and preparation method and application thereof ) 是由 李平兰 谭春明 张金兰 武瑞赟 赖孟瑄 尹剑 于 2019-11-22 设计创作，主要内容包括：本发明涉及水产品加工技术领域和保健品开发技术领域,尤其涉及一种鲟鱼蛋白肽粉及其制备方法与应用。所述鲟鱼蛋白肽粉的制备方法包括：(1)将鲟鱼皮经预处理得鲟鱼蛋白粗提物；(2)将所述鲟鱼蛋白粗提物的pH值调节为7.5～8.5,在碱性蛋白酶的作用下进行酶解反应；所述碱性蛋白酶与鲟鱼蛋白粗提物的质量百分比为1.5～3％。利用上述方法制得的鲟鱼蛋白肽粉富含丰富的二肽基肽酶-4抑制剂,且其抑制活性大于62％,该鲟鱼蛋白肽粉对各个糖尿病史阶段的人群均有辅助降血糖的作用。本发明还提供一种包含上述鲟鱼蛋白肽粉的降血糖固体饮料,所述降血糖固体饮料的原料均来自天然动植物,可直接、长期饮用,避免了传统药物的毒副作用,安全可靠。(The invention relates to the technical field of aquatic product processing and health product development, in particular to sturgeon protein peptide powder and a preparation method and application thereof. The preparation method of the sturgeon protein peptide powder comprises the following steps: (1) pretreating sturgeon skin to obtain sturgeon protein crude extract; (2) adjusting the pH value of the sturgeon protein crude extract to 7.5-8.5, and carrying out enzymolysis reaction under the action of alkaline protease; the mass percentage of the alkaline protease to the sturgeon protein crude extract is 1.5-3%. The sturgeon protein peptide powder prepared by the method is rich in dipeptidyl peptidase-4 inhibitors, the inhibition activity of the sturgeon protein peptide powder is greater than 62%, and the sturgeon protein peptide powder has an auxiliary blood sugar reducing effect on people in all stages of diabetes history. The invention also provides the solid beverage for reducing blood sugar, which contains the sturgeon protein peptide powder, wherein the raw materials of the solid beverage for reducing blood sugar are all natural animals and plants, and the solid beverage can be directly drunk for a long time, avoids toxic and side effects of traditional medicines, and is safe and reliable.)

1. A preparation method of sturgeon protein peptide powder is characterized by comprising the following steps:

(1) pretreating sturgeon skin to obtain sturgeon protein crude extract;

(2) adjusting the pH value of the sturgeon protein crude extract to 7.5-8.5, and carrying out enzymolysis reaction under the action of alkaline protease; the mass percentage of the alkaline protease to the sturgeon protein crude extract is 1.5-3%; preferably, the temperature of the enzymolysis reaction is 50-60 ℃, and the time is 40-60 min.

2. The method of claim 1, wherein the pre-treating comprises: cutting the sturgeon skin into small blocks, and soaking the sturgeon skin in 1.5-2.5% acetic acid solution for 1.5-2.5 h to obtain softened sturgeon skin; mixing and stirring the softened sturgeon skin and water, smashing, and then carrying out water bath steaming treatment; preferably, the mass ratio of the sturgeon skin to the water is 1: 1 to 3.

3. The method of claim 1 or 2, further comprising a step of post-treatment: inactivating enzyme of the enzymatic hydrolysate after the enzymatic hydrolysis reaction for 8-12 min, centrifuging for 10-15 min at 6000-8000 Xg, and taking supernatant; adding activated carbon into the supernatant, adsorbing at 40-60 ℃ for 40-60 min, then sub-packaging the supernatant with the activated carbon taken out into a 3kDa ultrafiltration centrifugal tube, and centrifuging at 10000-12000 Xg for 20-25 min; preferably, the adding amount of the activated carbon is 4-8% of the supernatant.

4. The method of claim 1, comprising the steps of:

(1) cutting the sturgeon skin into small blocks, and soaking the sturgeon skin in 1.5-2.5% acetic acid solution for 1.5-2.5 h to obtain softened sturgeon skin; mixing the softened sturgeon skin with water according to the weight ratio of 1: mixing, stirring and smashing the raw materials according to the mass ratio of 1-3, and then carrying out water bath steaming treatment to obtain a sturgeon protein crude extract;

(2) adjusting the pH value of the sturgeon protein crude extract to 7.5-8.5, carrying out enzymolysis with alkaline protease at 50-60 ℃ for 40-60 min, inactivating enzyme in a boiling water bath for 8-12 min, centrifuging at 6000-8000 Xg for 10-15 min, and taking supernatant;

wherein the mass percentage of the alkaline protease to the sturgeon protein crude extract is 1.5-3%;

(3) adding activated carbon into the supernatant, adsorbing at 40-60 ℃ for 40-60 min, sub-packaging the supernatant after taking out the activated carbon into a 3kDa ultrafiltration centrifugal tube, centrifuging at 10000-12000 Xg for 20-25 min, taking the filtered supernatant, and drying in vacuum;

wherein the addition amount of the activated carbon is 4-8% of the supernatant.

5. Sturgeon protein peptide powder, characterized by being prepared by the preparation method of any one of claims 1 to 4.

6. The sturgeon protein peptide powder of claim 5 for use in a solid beverage for reducing blood sugar.

7. A solid beverage for reducing blood sugar, comprising the sturgeon protein peptide powder according to claim 5.

8. The solid beverage for reducing blood sugar according to claim 7, further comprising L-arabinose, black tea powder, fruit and vegetable powder.

9. The solid beverage for reducing blood sugar according to claim 7 or 8, which is prepared from the following raw materials in parts by weight: 8.0-10.0 parts of sturgeon protein peptide powder, 5.0-6.4 parts of L-arabinose, 37.6-40.0 parts of black tea powder and 45.0-48.0 parts of fruit and vegetable powder;

preferably, the feed additive is prepared from the following raw materials in parts by weight: 9.0 parts of sturgeon protein peptide powder, 5.7 parts of L-arabinose, 38.8 parts of black tea powder and 46.5 parts of fruit and vegetable powder.

10. The solid beverage for reducing blood sugar according to any one of claims 7 to 9, wherein the fruit and vegetable powder is one or more selected from strawberry powder, grape powder and orange powder.

Technical Field

The invention relates to the technical field of aquatic product processing and health product development, in particular to sturgeon protein peptide powder and a preparation method and application thereof.

Background

At present, diabetes characterized by chronic hyperglycemia caused by insulin secretion defect seriously threatens the life health of people, and the optimal scheme for treating diabetes at present is to select more than one hypoglycemic medicament, but the clinical application of the traditional hypoglycemic medicament is greatly limited due to the occurrence of adverse drug reactions such as hypoglycemia, increased physical quality and the like. Therefore, the development of novel hypoglycemic drugs or products with auxiliary hypoglycemic function is urgently needed.

In recent years, mammalian skin and achilles tendon tissue have failed to meet application requirements as a primary source of native collagen. Aquatic collagen, such as fish collagen, is increasingly becoming the primary source of natural collagen. Sturgeons are one of the existing freshwater fishes with large body size and long service life, and the total amount of the cultured sturgeons is continuously increased due to high nutritional value and good culture economic benefit, so that a large amount of sturgeon processing byproducts such as fish skin, viscera, fishbone and the like are generated every year. In the deep processing process of sturgeons, the generated byproducts of fishskin and fishbone contain rich collagen and can be used as natural raw materials for extracting high-quality collagen.

Dipeptidyl peptidase-4 is a cell surface serine protease that rapidly cleaves endogenously active glucagon-like peptide-1 (GLP-l) in vivo, resulting in a very short half-life, and GLP-1 inhibits glucagon at hyperglycemic levels, based on the glucose level in plasma. When the blood sugar content in normal human body is lower than the blood sugar level in the fasting state, GLP-1 can prevent the body from generating the symptom of hypoglycemia by reducing the inhibition degree of the GLP-1, and the dipeptidyl peptidase-4 inhibitor has the effects of preventing endogenous active GLP-1 from cracking and prolonging the half life of the GLP-1, so that the concentration level and the efficiency of the GLP-1 in blood plasma are improved, the ratio of endogenous insulin to glucagon is further regulated, and the aim of improving type II diabetes is fulfilled.

In view of the above, the present invention is particularly proposed.

Disclosure of Invention

In order to solve the technical problems, the invention provides a preparation method of sturgeon protein peptide powder; the sturgeon skin after special treatment can obtain sturgeon protein peptide powder rich in dipeptidyl peptidase-4 inhibitor, the inhibition activity of the sturgeon protein peptide powder is more than 62%, the sturgeon protein peptide powder has the function of assisting in reducing blood sugar, and the toxic and side effects of the traditional hypoglycemic drugs are avoided; meanwhile, the sturgeon skin is used as the raw material of the protein peptide powder, so that the utilization rate of sturgeon processing byproducts is greatly increased, and the additional value of the sturgeon is improved; also provides natural raw materials for developing novel hypoglycemic drugs for treating diabetes.

Specifically, the preparation method of the sturgeon protein peptide powder comprises the following steps:

(1) pretreating sturgeon skin to obtain sturgeon protein crude extract;

(2) adjusting the pH value of the sturgeon protein crude extract to 7.5-8.5, and carrying out enzymolysis reaction under the action of alkaline protease; the mass percentage of the alkaline protease to the sturgeon protein crude extract is 1.5-3%; preferably, the temperature of the enzymolysis reaction is 50-60 ℃, and the time is 40-60 min.

The activity of protease can be directly influenced by the excessively low or high temperature and pH of the enzymolysis reaction, and the quality of products is further influenced; a large number of experimental researches show that the method is particularly ideal for enzymolysis of alkaline protease for 40-60 min at the pH value of 7.5-8.5 and the temperature of 50-60 ℃, and the protein hydrolysis degree is higher under the conditions; meanwhile, when the mass percentage of the alkaline protease to the sturgeon protein crude extract is 1.5-3%, the utilization rate of the enzyme is high, and energy is saved.

According to the invention, a sturgeon protein crude extract is treated by selecting a specific enzyme under a specific condition, so that sturgeon protein peptide powder rich in a dipeptidyl peptidase-4 inhibitor is obtained; in order to further optimize the inhibitory activity of the sturgeon protein peptide powder, the extraction process is optimized (all optimized conditions are combined to form the optimal technical scheme of the invention), and the method specifically comprises the following steps:

preferably, the pretreatment comprises: cutting the sturgeon skin into small blocks, and soaking the sturgeon skin in 1.5-2.5% acetic acid solution for 1.5-2.5 h to obtain softened sturgeon skin; mixing and stirring the softened sturgeon skin and water, smashing, and then carrying out water bath steaming treatment; preferably, the mass ratio of the sturgeon skin to the water is 1: 1 to 3.

Preferably, the mass ratio of the sturgeon skin to the water is 1: 2.

the sturgeon skin selected by the invention is the back and two side parts of the sturgeon, and is cut into small blocks of 4-6 mm multiplied by 4-6 mm in advance before softening; the vessel used for the waterbath cooking process needs to have good thermal conductivity, and is heated until the liquid becomes viscous and obvious collagen is separated out.

Preferably, the method further comprises the following post-processing steps: inactivating enzyme of the enzymatic hydrolysate after the enzymatic hydrolysis reaction for 8-12 min, centrifuging for 10-15 min at 6000-8000 Xg, and taking supernatant; adding activated carbon into the supernatant, adsorbing at 40-60 ℃ for 40-60 min, then sub-packaging the supernatant with the activated carbon taken out into a 3kDa ultrafiltration centrifugal tube, and centrifuging at 10000-12000 Xg for 20-25 min; preferably, the adding amount of the activated carbon is 4-8% of the supernatant.

As a better technical scheme of the invention, the preparation method comprises the following steps:

(1) cutting the sturgeon skin into small blocks, and soaking the sturgeon skin in 1.5-2.5% acetic acid solution for 1.5-2.5 h to obtain softened sturgeon skin; mixing the softened sturgeon skin with water according to the weight ratio of 1: mixing, stirring and smashing the raw materials according to the mass ratio of 1-3, and then carrying out water bath steaming treatment to obtain a sturgeon protein crude extract;

(2) adjusting the pH value of the sturgeon protein crude extract to 7.5-8.5, carrying out enzymolysis with alkaline protease at 50-60 ℃ for 40-60 min, inactivating enzyme in a boiling water bath for 8-12 min, centrifuging at 6000-8000 Xg for 10-15 min, and taking supernatant;

wherein the mass percentage of the alkaline protease to the sturgeon protein crude extract is 1.5-3%;

(3) adding activated carbon into the supernatant, adsorbing at 40-60 ℃ for 40-60 min, sub-packaging the supernatant after taking out the activated carbon into a 3kDa ultrafiltration centrifugal tube, centrifuging at 10000-12000 Xg for 20-25 min, taking the filtered supernatant, and drying in vacuum;

wherein the addition amount of the activated carbon is 4-8% of the supernatant.

Preferably, the vacuum drying conditions are as follows: the reaction is carried out for 24 hours at 1000Pa and 58-60 ℃; in a specific embodiment, an LGJ-12 freeze dryer is used.

The invention also provides sturgeon protein peptide powder, which is prepared by the preparation method.

The invention also provides application of the sturgeon protein peptide powder in a solid beverage for reducing blood sugar.

The invention provides a solid beverage for reducing blood sugar, which comprises the sturgeon protein peptide powder.

Preferably, the solid beverage for reducing blood sugar further comprises L-arabinose, black tea powder and fruit and vegetable powder.

Preferably, the solid beverage for reducing blood sugar is prepared from the following raw materials in parts by weight: 8.0-10.0 parts of sturgeon protein peptide powder, 5.0-6.4 parts of L-arabinose, 37.6-40.0 parts of black tea powder and 45.0-48.0 parts of fruit and vegetable powder.

As a better technical scheme, the solid beverage for reducing blood sugar is prepared from the following raw materials in parts by weight: 9.0 parts of sturgeon protein peptide powder, 5.7 parts of L-arabinose, 38.8 parts of black tea powder and 46.5 parts of fruit and vegetable powder.

The solid beverage for reducing blood sugar provided by the invention is rich in abundant dipeptidyl peptidase-4 inhibitors, is particularly suitable for diabetics to drink, can assist the diabetics to reduce blood sugar, and is safe and free of toxic and side effects after being drunk for a long time.

Preferably, the fruit and vegetable powder is selected from one or more of strawberry powder, grape powder and orange powder.

The invention has the beneficial effects that:

(1) the preparation method of the sturgeon protein peptide powder can reserve active ingredients in the sturgeon protein peptide powder to the maximum extent, ensures water solubility, is convenient for digestion, absorption and drinking, has sufficient raw materials, low cost and simple production process, is suitable for batch production, and is easy to store and transport; meanwhile, a new way is opened up for the full utilization of the sturgeon processing by-products, the added value of the sturgeon is improved, and the economic benefit of the sturgeon is greatly increased.

(2) The sturgeon protein peptide powder is rich in abundant dipeptidyl peptidase-4 inhibitors, and the inhibitory activity of the sturgeon protein peptide powder is more than 62%; the sturgeon protein peptide powder is an excellent dipeptidyl peptidase-4 peptide inhibitor, can partially replace the intervention of insulin and medicines, reduces the usage amount of the medicines, and has the auxiliary blood sugar reducing effect on people in each diabetes history stage.

(3) The solid beverage for reducing blood sugar provided by the invention has the advantages that the raw materials are all natural animals and plants, the solid beverage can be directly drunk for a long time, the toxic and side effects of traditional medicines are avoided, and the solid beverage is safe and reliable.

Detailed Description

The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.