阅读说明：本技术 一种火麻仁粕蛋白多肽液的生产方法和一种具有降尿酸作用的多肽液及其应用 (Production method of fructus cannabis meal protein polypeptide liquid, polypeptide liquid with uric acid reducing effect and application of polypeptide liquid ) 是由 乔长晟 张泽宇 牛思思 钟海蛟 于世云 孙银华 于 2021-02-04 设计创作，主要内容包括：本发明公开了一种火麻仁粕蛋白多肽液的生产方法及一种具有降尿酸作用的多肽液及,所述火麻仁粕蛋白多肽液的生产方法包括以下步骤：将火麻仁粕加水打浆、超声处理、调节pH值后加入碱性蛋白酶,水解后灭酶,得到火麻仁一步酶解液,再通过酶解结合发酵法或两步酶解法,得到一组具有降尿酸功能的生物活性多肽液。通过反向高效液相色谱法对多肽液体外黄嘌呤氧化酶抑制活性进行测定,以常用药别嘌呤醇作为阳性对照,与火麻仁粕多肽液进行对比,结果表明本发明结合酶解和生物发酵技术,以火麻仁粕制备出的生物活性肽,降尿酸作用显著。(The invention discloses a production method of fructus cannabis meal protein polypeptide liquid, polypeptide liquid with the effect of reducing uric acid and the production method of the fructus cannabis meal protein polypeptide liquid, which comprises the following steps: adding water into fructus cannabis meal, pulping, performing ultrasonic treatment, adjusting the pH value, adding alkaline protease, hydrolyzing, inactivating enzyme to obtain fructus cannabis one-step enzymolysis liquid, and performing enzymolysis combined with fermentation or two-step enzymolysis to obtain a group of bioactive polypeptide liquid with uric acid reducing function. The external xanthine oxidase inhibitory activity of the polypeptide liquid is determined by reverse high performance liquid chromatography, and the common allopurinol is used as a positive control to be compared with the hemp seed meal polypeptide liquid, and the result shows that the biological active peptide prepared from the hemp seed meal has obvious effect of reducing uric acid by combining enzymolysis and biological fermentation technologies.)

1. A production method of fructus cannabis meal protein polypeptide liquid comprises the following steps:

(1) raw material treatment: uniformly mixing the fructus cannabis meal and water, crushing and uniformly mixing to obtain fructus cannabis meal stock solution;

(2) ultrasonic treatment: putting the raw liquid of the fructus cannabis meal into ultrasonic crushing;

(3) one-step enzymolysis: inactivating enzyme of the ultrasonic fructus cannabis meal stock solution, adjusting pH, adding alkaline protease, mixing uniformly, performing enzymolysis reaction, and inactivating enzyme to obtain one-step enzymolysis polypeptide solution;

characterized in that the steps further comprise step (4) or step (5):

(4) and (3) fermentation after enzymolysis: sterilizing the polypeptide liquid subjected to the first step of enzymolysis, inoculating lactobacillus, fermenting, sterilizing, centrifuging, and taking supernatant to obtain polypeptide liquid subjected to enzymolysis and fermentation;

(5) two steps of enzymolysis: and adding a second protease into the polypeptide liquid subjected to the first-step enzymolysis, uniformly mixing, inactivating enzymes after the enzymolysis, centrifuging, and taking supernatant to obtain the polypeptide liquid subjected to the second-step enzymolysis.

2. The production method according to claim 1, wherein the material-to-liquid ratio of the hemp seed meal to the water in step 1 is 1: 8-1: 12.

3. the method of claim 2, wherein the crushing in step 1 is by colloid mill.

4. The production method according to claim 1, wherein the ultrasonication in the step 2 is carried out at a power of 200 to 600w for a treatment time of 15 to 25 minutes.

5. The method according to claim 1, wherein the pH in step 3 is adjusted to 7 to 8, and alkaline protease is added.

6. The method according to claim 1, wherein the lactic acid bacteria in step 4 is at least one of Lactobacillus bulgaricus, Lactobacillus delbrueckii, and Lactobacillus plantarum.

7. The method of claim 1, wherein in step 5, the second protease is at least one of flavourzyme, neutrase, papain or bromelain.

8. A polypeptide liquid with uric acid lowering effect is characterized by comprising fructus cannabis active polypeptide liquid.

9. The polypeptide fluid of claim 8, prepared by the steps of:

(1) raw material treatment: uniformly mixing the fructus cannabis meal and water according to a material-liquid ratio of 1:10, crushing and uniformly mixing the fructus cannabis meal by a colloid mill to obtain a fructus cannabis meal stock solution;

(2) ultrasonic treatment: putting the hemp seed meal stock solution into an ultrasonic cleaning machine, wherein the power is 400w, and the processing time is 20 minutes;

(3) one-step enzymolysis: inactivating enzyme of the ultrasonic fructus cannabis meal stock solution, adjusting the pH value to 7.5, adding alkaline protease, mixing uniformly, carrying out enzymolysis at 50 ℃ for 5 hours, and inactivating enzyme to obtain a one-step enzymolysis polypeptide solution;

the steps further comprise step (4) or step (5):

(4) and (3) fermentation after enzymolysis: pasteurizing the polypeptide liquid subjected to the first step, inoculating lactobacillus, fermenting at 43 ℃ for 8 hours for sterilization, performing centrifugation at 4000r/min for 10min, and taking supernatant to obtain polypeptide liquid subjected to fermentation after enzymolysis;

(5) two steps of enzymolysis: adding the first-step enzymolysis polypeptide liquid into a second protease, uniformly mixing, carrying out enzymolysis at 50 ℃ for 5 hours, then carrying out enzyme deactivation, carrying out centrifugation at 4000r/min for 10min, and taking supernatant to obtain the second-step enzymolysis polypeptide liquid.

10. The production method of the hemp seed meal protein polypeptide liquid according to any one of claims 1 to 7 and the application of the polypeptide liquid with uric acid reducing effect according to claim 8 or 9 as an auxiliary therapeutic drug for gout diseases or a health food and a medicine with uric acid reducing function.

Technical Field

The invention relates to the technical field of biology, in particular to a preparation method and application of polypeptide with a function of reducing uric acid.

Background

Gout, also known as hyperuricemia, is a disease caused by disturbance of purine metabolism in vivo and increase of uric acid. In recent years, the proportion of high-energy and high-purine foods eaten by people is remarkably increased; and along with the continuous acceleration of the life rhythm, the human body is often in a stress state, the internal environment is disordered, and a large amount of purine can be generated in the human body; in addition, irregular living and lack of physical exercise affect uric acid discharge. So that hyperuricemia has become a common disease and a frequently encountered disease.

At present, the method for treating hyperuricemia mainly adopts colchicine or non-steroidal anti-inflammatory drugs to diminish inflammation in an acute attack stage, and adopts other drugs such as allopurin to reduce the content of uric acid after a little relief, and severe patients can only adopt surgery treatment. The western medicines used at present have certain side effects on the liver and kidney and are expensive; gout is also difficult to cure radically by surgical treatment. Therefore, there is an urgent need to develop an efficient and safe active substance for preventing and treating gout.

Scientific research shows that proteins are easier to absorb in the form of oligopeptides than macromolecular proteins and amino acids, and have higher biological activity. The bioactive peptide has antioxidant, antibacterial, blood pressure lowering, blood sugar lowering, and antitumor effects.

The fructus cannabis meal is a byproduct of fructus cannabis after oil extraction through squeezing, is rich in protein, is rich in arginine and glutamic acid, is a good plant protein resource, and is also a high-quality nutrition source for human bodies. However, at present, the hemp seed meal is mostly used as feed, and deep processing is insufficient, so that great resource waste is caused. Therefore, the hemp seed meal is used as a raw material, and the development of the bioactive polypeptide with the function of reducing uric acid has important significance and value.

Disclosure of Invention

The invention aims to provide a group of fructus cannabis active polypeptide liquid with the effect of reducing uric acid and a preparation method thereof, and provides reference for developing health care products or medicines for preventing or treating gout.

The invention provides a production method of hemp seed meal protein polypeptide liquid, which comprises the following steps:

(1) raw material treatment: uniformly mixing the fructus cannabis meal and water, crushing and uniformly mixing to obtain fructus cannabis meal stock solution;

(2) ultrasonic treatment: putting the raw liquid of the fructus cannabis meal into ultrasonic crushing;

(3) one-step enzymolysis: inactivating enzyme of the ultrasonic fructus cannabis meal stock solution, adjusting pH, adding alkaline protease, mixing uniformly, performing enzymolysis reaction, and inactivating enzyme to obtain one-step enzymolysis polypeptide solution;

the steps further comprise step (4) or step (5):

(4) and (3) fermentation after enzymolysis: sterilizing the polypeptide liquid subjected to the first step of enzymolysis, then inoculating lactobacillus, fermenting, sterilizing, centrifuging, and taking supernatant to obtain polypeptide liquid subjected to enzymolysis and fermentation;

(5) two steps of enzymolysis: and adding the first-step enzymolysis polypeptide liquid into a second protease, uniformly mixing, inactivating enzymes after enzymolysis, centrifuging and taking supernatant to obtain the second-step enzymolysis polypeptide liquid.

Preferably, the material-to-liquid ratio of the fructus cannabis meal to the water in the step 1 is 1: 8-1: 12, and more preferably 1: the material-liquid ratio is 10, the concentration is too low, and the treatment cost is increased; too much air bubbles are generated in the process of treating the feed liquid due to too high concentration of the feed liquid, so that the reaction is not facilitated.

Any one of the above is preferably crushed by a colloid mill.

Any one of the above conditions is preferably that the ultrasonication in step 2 is carried out at a power of 200 to 600w for a treatment time of 15 to 25 minutes, more preferably at a power of 400w for a treatment time of 20 minutes.

Preferably, in any of the above steps, the pH is adjusted to 7.5 in step 3 and alkaline protease is added. Since each protease has different action conditions (such as different pH values, temperatures and the like), the direct mixing may affect the efficiency of the enzymes. Alkaline protease is preferred because it has a high enzymatic activity and a high hydrolysis efficiency, and it is advantageous to dissolve hemp seed protein under alkaline conditions, so that a stronger protein polypeptide hydrolysis effect can be obtained. The alkaline protease provided by the invention is an enzyme capable of hydrolyzing macromolecular protein into micromolecular peptide and amino acid under an alkaline condition, and has the optimum pH of 7-8. In a preferred embodiment of the present invention, Alcalase2.4L, an alkaline protease from Novoxin Biotechnology, Inc., is used. However, the alkaline protease of the present invention is not limited thereto, and alkaline proteases satisfying the above definition are within the scope of the present invention, including but not limited to commercially available alkaline proteases. Preferably, the concentration of alkaline protease is 10000U/g ([ E ]/[ S ]) -14000U/g ([ E ]/[ S ]), and more preferably 12000U/g ([ E ]/[ S ]). Compared with the alkaline protease in the prior art, the optimum pH value of the alkaline protease is 9-11, and the optimum action pH value of the alkaline protease is preferably 7-8. The research process of the invention finds that the hydrolysis reaction may be related to specific raw materials in the invention, and the most preferable optimum hydrolysis pH value of the raw materials suitable for the invention is 7.5 alkalescence through the earlier research of the invention, the enzyme digestion efficiency of the raw materials and the uric acid reducing effect of the obtained polypeptide liquid are the best, which may be related to some special properties of the fructus cannabis.

Any of the above is preferred, in step 4, the lactic acid bacteria is at least one of lactobacillus bulgaricus, lactobacillus delbrueckii or lactobacillus plantarum. Lactic acid bacteria can generate rich enzyme systems in the fermentation process, and the condition of single enzyme cutting site can be caused by using a finished enzyme preparation for enzymolysis, so that the functionality of the obtained polypeptide liquid is limited; if a fermentation method is directly used, macromolecular protein is difficult to be directly utilized by lactic acid bacteria, so that the condition of low fermentation efficiency is caused; and the hemp seed protein is subjected to primary enzymolysis by using the finished enzyme and then fermented by using the lactic acid bacteria, so that the problem of single enzyme cutting site can be solved, the fermentation efficiency of the lactic acid bacteria can be improved, and the target functional polypeptide is increased. Preferably, the inoculation amount of the lactobacillus is 2-4% of lactobacillus bacterial liquid with an OD value of 0.8.

In any of the above cases, in step 5, the second protease is preferably a protease which cleaves a polypeptide chain having a large molecular weight from the middle to form a peptide fragment having a smaller molecular weight or a free amino acid, and is different from the protease in the first enzymatic hydrolysis. By a different protease is meant that the alkaline protease of the first step of the enzymatic hydrolysis has a different cleavage site than the second protease. Because of the specificity of the enzyme, the preferable scheme of the invention makes the enzyme cutting site not single, and makes the peptide fragments after enzyme cutting diversified by using different proteases. Preferably, the optimum pH of the second protease is 7-8, and more preferably, the second protease is flavourzyme, neutral proteinase, bromelain or papain. In a preferred embodiment of the invention the Flavourzyme Flavourzyme500 MG or the complex protease Protamex from Novoxin Biotechnology Ltd is used. Bromelain and papain are also commercially available products. However, the second protease of the present invention is not limited to the type of the purchased route and the type of the purchased product, and proteases satisfying the above definitions and actions are within the scope of the present invention, and the second protease is added at a concentration of 8000U/g ([ E ]/[ S ]) -12000U/g ([ E ]/[ S ]), and more preferably 10000U/g ([ E ]/[ S ]).

Any one of the above preferable methods is that in the step 1, the fructus cannabis meal and the water are mixed uniformly according to the material-liquid ratio of 1:10, and the mixture is crushed and mixed uniformly by a colloid mill to obtain the fructus cannabis meal stock solution.

Any one of the above preferred methods is that in the step 2, the hemp seed meal stock solution is put into an ultrasonic cleaning machine, the power is 400w, and the processing time is 20 minutes.

Any one of the above preferable ones is that, in step 3, after the ultrasonic processed fructus cannabis meal stock solution is inactivated, the pH value is adjusted to 7.5, alkaline protease is added, after uniform mixing, enzymolysis is carried out for 5 hours at 50 ℃, and the enzyme is inactivated, so as to obtain the one-step enzymolysis polypeptide solution.

Any one of the above preferable ones is that in step 4, the polypeptide liquid after enzymolysis is pasteurized in one step, inoculated with lactic acid bacteria, fermented at 43 ℃ for 8 hours for sterilization, 4000r/min, centrifuged for 10min, and the supernatant is taken to obtain the polypeptide liquid after enzymolysis. Lactic acid bacteria can generate rich enzyme systems in the fermentation process, and the condition of single enzyme cutting site can be caused by using a finished enzyme preparation for enzymolysis, so that the functionality of the obtained polypeptide liquid is limited; if a fermentation method is directly used, macromolecular protein is difficult to be directly utilized by lactic acid bacteria, so that the condition of low fermentation efficiency is caused; and the hemp seed protein is subjected to primary enzymolysis by using the finished enzyme and then fermented by using the lactic acid bacteria, so that the problem of single enzyme cutting site can be solved, the fermentation efficiency of the lactic acid bacteria can be improved, and the target functional polypeptide is increased. Preferably, the lactic acid bacteria are at least one of lactobacillus bulgaricus, lactobacillus delbrueckii or lactobacillus plantarum. More preferably, the inoculation amount of the lactobacillus is 2-4% of lactobacillus bacterial liquid with an OD value of 0.8.

Any one of the above preferable ones is that in step 5, the polypeptide liquid of the first step is added with the second protease, mixed uniformly, enzymolyzed at 50 ℃ for 5 hours, then enzyme is inactivated, 4000r/min, centrifuged for 10min, and the supernatant is taken to obtain the polypeptide liquid of the second step.

In any one of the above cases, the enzyme deactivation in step 3 is to keep the hemp seed meal slurry in a boiling water bath for 10 min.

Any one of the above is preferred, the pasteurization in step 4 is to heat the hemp seed meal slurry to 60 ℃ for 30 min.

The invention also provides polypeptide liquid with the effect of reducing uric acid, which is characterized by containing the fructus cannabis active polypeptide liquid.

Preferably, the preparation method comprises the following steps:

(1) raw material treatment: uniformly mixing the fructus cannabis meal and water, crushing and uniformly mixing to obtain fructus cannabis meal stock solution;

(2) ultrasonic treatment: putting the raw liquid of the fructus cannabis meal into ultrasonic crushing;

(3) one-step enzymolysis: and (3) inactivating enzyme of the ultrasonic fructus cannabis meal stock solution, adjusting the pH, adding alkaline protease, mixing uniformly, performing enzymolysis reaction, and inactivating enzyme to obtain one-step enzymolysis polypeptide solution.

Preferably, in any one of the above cases, the step further comprises step (4) or step (5):

(4) and (3) fermentation after enzymolysis: sterilizing the polypeptide liquid subjected to the first step, adjusting the pH value, inoculating lactobacillus, fermenting, sterilizing, centrifuging, and taking supernatant to obtain polypeptide liquid subjected to enzymolysis and fermentation;

(5) two steps of enzymolysis: and (3) adjusting the pH value of the first-step enzymolysis polypeptide liquid, adding a second protease, uniformly mixing, inactivating enzymes after enzymolysis, centrifuging, and taking supernatant to obtain a second-step enzymolysis polypeptide liquid.

Any one of the above is preferred, the ratio of the hemp seed meal to the water in step 1 is 1:8 to 1:12, further preferred is 1: 10.

any one of the above is preferably crushed by a colloid mill.

Any one of the above is preferred, the ultrasonication in step 2 is carried out at a power of 400w for a treatment time of 20 minutes.

Preferably, in any of the above steps, the pH is adjusted to 7.5 in step 3 and alkaline protease is added.

Any of the above is preferred, in step 4, the lactic acid bacteria is at least one of lactobacillus bulgaricus, lactobacillus delbrueckii or lactobacillus plantarum. Lactic acid bacteria can generate rich enzyme systems in the fermentation process, and the condition of single enzyme cutting site can be caused by using a finished enzyme preparation for enzymolysis, so that the functionality of the obtained polypeptide liquid is limited; if a fermentation method is directly used, macromolecular protein is difficult to be directly utilized by lactic acid bacteria, so that the condition of low fermentation efficiency is caused; and the hemp seed protein is subjected to primary enzymolysis by using the finished enzyme and then fermented by using the lactic acid bacteria, so that the problem of single enzyme cutting site can be solved, the fermentation efficiency of the lactic acid bacteria can be improved, and the target functional polypeptide is increased. Preferably, the inoculation amount of the lactobacillus is 2-4% of lactobacillus bacterial liquid with an OD value of 0.8.

In any of the above cases, in step 5, the second protease is preferably at least one of flavourzyme, neutrase, bromelain, and papain.

Any one of the above preferable methods is that in the step 1, the fructus cannabis meal and the water are mixed uniformly according to the material-liquid ratio of 1:10, and the mixture is crushed and mixed uniformly by a colloid mill to obtain the fructus cannabis meal stock solution.

Any one of the above preferred methods is that in the step 2, the hemp seed meal stock solution is put into an ultrasonic cleaning machine, the power is 400w, and the processing time is 20 minutes.

Any one of the above preferable ones is that, in step 3, after the ultrasonic processed fructus cannabis meal stock solution is inactivated, the pH value is adjusted to 7.5, alkaline protease is added, after uniform mixing, enzymolysis is carried out for 5 hours at 50 ℃, and the enzyme is inactivated, so as to obtain the one-step enzymolysis polypeptide solution.

Any one of the above preferable ones is that in step 4, the polypeptide liquid after enzymolysis is pasteurized in one step, inoculated with lactic acid bacteria, fermented at 43 ℃ for 8 hours for sterilization, 4000r/min, centrifuged for 10min, and the supernatant is taken to obtain the polypeptide liquid after enzymolysis. Lactic acid bacteria can generate rich enzyme systems in the fermentation process, and the condition of single enzyme cutting site can be caused by using a finished enzyme preparation for enzymolysis, so that the functionality of the obtained polypeptide liquid is limited; if a fermentation method is directly used, macromolecular protein is difficult to be directly utilized by lactic acid bacteria, so that the condition of low fermentation efficiency is caused; and the hemp seed protein is subjected to primary enzymolysis by using the finished enzyme and then fermented by using the lactic acid bacteria, so that the problem of single enzyme cutting site can be solved, the fermentation efficiency of the lactic acid bacteria can be improved, and the target functional polypeptide is increased.

Any one of the above preferable ones is that, in the step 5, the one-step enzymolysis polypeptide liquid is added with the second protease, mixed uniformly, enzymolyzed for 5 hours at 50 ℃, inactivated, 4000r/min, centrifuged for 10min, and the supernatant is taken to obtain the two-step enzymolysis polypeptide liquid.

In any one of the above cases, the enzyme deactivation in step 3 is to keep the hemp seed meal slurry in a boiling water bath for 10 min.

Any one of the above is preferred, the pasteurization in step 4 is to heat the hemp seed meal slurry to 60 ℃ for 30 min.

The invention also provides a production method of the hemp seed meal protein polypeptide liquid and application of the polypeptide liquid with the function of reducing uric acid as an auxiliary treatment medicament for gout diseases or health-care food and medicines with the function of reducing uric acid.

The in-vitro uric acid reducing activity of the polypeptide liquid is detected by adopting an RP-HPLC method, and the polypeptide liquid shows obvious uric acid reducing activity in the in-vitro uric acid reducing activity detection.

Furthermore, the polypeptide liquid has higher uric acid reducing activity.

Further, the polypeptide can be used as an auxiliary treatment medicament for gout diseases or used for developing health-care food and medicines with uric acid reducing as functional factors.

Drawings

FIG. 1 is a uric acid peak chromatogram of examples 1 to 7 of the present invention.

FIG. 2 is a uric acid peak chromatogram showing the uric acid peak patterns of allopurinol according to comparative examples 1 to 3 of the present invention.

Detailed Description

The present invention will be more clearly and completely described in the following embodiments, but the described embodiments are only a part of the embodiments of the present invention, and not all of them. The examples are provided to aid understanding of the present invention and should not be construed to limit the scope of the present invention.

The present invention utilizes reversed-phase high performance liquid chromatography (RP-HPLC method) to measure the uric acid content, and the following operation method is only one embodiment, and the scope of the present invention is not limited thereto.

The method for measuring the content of uric acid by using the reversed-phase high-performance liquid chromatography (RP-HPLC method) comprises the following steps:

(1) reagent preparation method

50mmol/L Tris-HCl (pH7.5) buffer: 6.0572g of Tris was weighed out accurately, dissolved in ultrapure water, adjusted to pH7.5 with 1mol/L HCl and made up to 1000mL for further use.

0.42mM xanthine working solution: 0.0064g xanthine is weighed, dissolved by a small amount of 1mol/LNaOH, added with deionized water to a constant volume of 10mL and mixed evenly to obtain a 10 Xxanthine stock solution which is diluted by 10 times when in use.

0.03U/mL xanthine oxidase working solution: accurately weighing 0.0034g of xanthine oxidase, diluting deionized water to 10mL, shaking uniformly to obtain 100 Xxanthine oxidase stock solution, and diluting by 100 times when in use.

Allopurinol working solution: accurately weighing 0.0054g of allopurinol, dissolving with a small amount of 1mol/L NaOH, diluting the solution to 10mL with deionized water, and uniformly mixing to obtain 400 mu M/L allopurinol stock solution. Respectively diluting to 20, 40 and 60 mu M/L.

10 μ g/mL uric acid stock: accurately weighing 0.0010g of uric acid, diluting deionized water to a constant volume of 1mL, shaking uniformly, and diluting to 0.5, 1.0, 1.5, 2.0 and 2.5 mu g/mL respectively for later use.

Mobile phase: 95% (V/V)15mmol/L NH₄H₂PO4+ 5% (V/V) chromatographic grade methanol, and ultrapure water to 1000ml, adjusting pH to 6.5 with phosphoric acid, passing through 0.22 μm organic membrane, and performing ultrasonic treatment.

(2) Sample pretreatment

Putting 200 μ L polypeptide liquid into 10ml centrifuge tube, adding 50 μ L xanthine oxidase, and keeping temperature in water bath at 37 deg.C for 10 min; adding 2.8mL of the above Tris-HCl buffer solution with pH of 7.5 and 400. mu.L of xanthine standard stock solution, and keeping the temperature in water bath at 37 ℃ for 25 min; adding 150 mu L mol/LHCl after 25min, stopping the reaction, cooling, passing through a 0.22 mu m water system filter membrane, and replacing a polypeptide sample solution with Tris-HCl buffer solution as a blank control to be detected.

A chromatographic column: shim-pack GIST C18 (4.6X 250mm, 5 μm)

Liquid phase conditions: the eluent is 5% (V/V) methanol + 95% (V/V) NH₄H₂PO₄The injection volume is 20 mu L, the flow rate is lmL/min, the detection wavelength is 290nm, the column temperature is 25 ℃, and the running time is 10 min.

Formula for calculating xanthine oxidase inhibition rate

In the invention, the fructus cannabis meal obtained in the step 1 is purchased from the market, and the obtained fructus cannabis meal is cold-pressed fructus cannabis meal with the oil content of not higher than 10%. Preferred cold-pressed hemp seed meal with a fat content of more than 10% is also suitable for use in the present invention.

Lactobacillus bulgaricus, Lactobacillus delbrueckii or Lactobacillus plantarum can be purchased from the Chinese microbial strain query net. However, the scope of the present invention is not limited to the purchasing routes of the strains.

Example 1

Uniformly mixing the fructus cannabis meal and water according to a material-liquid ratio of 1:10, crushing and uniformly mixing the fructus cannabis meal by a colloid mill to obtain a fructus cannabis meal stock solution; preparing the stock solution into a proper pH value of 7.5, putting the stock solution into an ultrasonic cleaning machine, and treating the stock solution for 20 minutes at the power of 400 w; after enzyme deactivation, 12000U/g ([ E ]/[ S ]) alkaline protease is added into the protein stock solution, after uniform mixing, enzymolysis is carried out for 5 hours at 50 ℃, enzyme deactivation is carried out, and one-step enzymolysis polypeptide solution is obtained; centrifuging at 4000r/min for 10min to obtain HSPS1 (referring to fructus Cannabis polypeptide solution obtained in example 1).

The peak shape and peak area of HSPS1 uric acid determined by RP-HPLC are shown in figure 1.

Example 2

Uniformly mixing the fructus cannabis meal and water according to a material-liquid ratio of 1:10, crushing and uniformly mixing the fructus cannabis meal by a colloid mill to obtain a fructus cannabis meal stock solution; preparing the stock solution into a proper pH value of 7.5, putting the stock solution into an ultrasonic cleaning machine, and treating the stock solution for 20 minutes at the power of 400 w; after enzyme deactivation, 12000U/g ([ E ]/[ S ]) alkaline protease is added into the protein stock solution, after uniform mixing, enzymolysis is carried out for 5 hours at 50 ℃, enzyme deactivation is carried out, and one-step enzymolysis polypeptide solution is obtained; pasteurizing the polypeptide liquid subjected to the first step, inoculating 2% of lactobacillus bulgaricus, performing anaerobic fermentation at 43 ℃ for 8 hours, and performing after-fermentation at 4 ℃ for 24 hours; sterilizing, and centrifuging at 4000r/min for 10min to obtain HSPS2 (referring to fructus Cannabis polypeptide solution obtained by treatment in example 2).

The peak shape and peak area of HSPS2 uric acid determined by RP-HPLC are shown in figure 1.

Example 3

Uniformly mixing the fructus cannabis meal and water according to a material-liquid ratio of 1:10, crushing and uniformly mixing the fructus cannabis meal by a colloid mill to obtain a fructus cannabis meal stock solution; preparing the stock solution into a proper pH value of 7.5, putting the stock solution into an ultrasonic cleaning machine, and treating the stock solution for 20 minutes at the power of 400 w; after enzyme deactivation, 12000U/g ([ E ]/[ S ]) alkaline protease is added into the protein stock solution, after uniform mixing, enzymolysis is carried out for 5 hours at 50 ℃, enzyme deactivation is carried out, and one-step enzymolysis polypeptide solution is obtained; performing pasteurization on the polypeptide liquid subjected to the one-step enzymolysis, inoculating 2% of lactobacillus delbrueckii, performing anaerobic fermentation at 43 ℃ for 8 hours, and performing after-fermentation at 4 ℃ for 24 hours; sterilizing, and centrifuging at 4000r/min for 10min to obtain HSPS3 (referring to fructus Cannabis polypeptide solution obtained by treatment in example 3).

The peak shape and peak area of HSPS3 uric acid determined by RP-HPLC are shown in figure 1.

Example 4

Uniformly mixing the fructus cannabis meal and water according to a material-liquid ratio of 1:10, crushing and uniformly mixing the fructus cannabis meal by a colloid mill to obtain a fructus cannabis meal stock solution; preparing the stock solution into a proper pH value of 7.5, putting the stock solution into an ultrasonic cleaning machine, and treating the stock solution for 20 minutes at the power of 400 w; after enzyme deactivation, 12000U/g ([ E ]/[ S ]) alkaline protease is added into the protein stock solution, after uniform mixing, enzymolysis is carried out for 5 hours at 50 ℃, enzyme deactivation is carried out, and one-step enzymolysis polypeptide solution is obtained; performing pasteurization on the polypeptide liquid subjected to the one-step enzymolysis, inoculating 2% of lactobacillus plantarum, performing anaerobic fermentation at 43 ℃ for 8 hours, and performing after-fermentation at 4 ℃ for 24 hours; sterilizing, and centrifuging at 4000r/min for 10min to obtain HSPS4 (referring to fructus Cannabis polypeptide solution obtained by processing in example 4).

The peak shape and peak area of HSPS4 uric acid determined by RP-HPLC are shown in figure 1.

Example 5

Uniformly mixing the fructus cannabis meal and water according to a material-liquid ratio of 1:10, crushing and uniformly mixing the fructus cannabis meal by a colloid mill to obtain a fructus cannabis meal stock solution; preparing the stock solution into a proper pH value of 7.5, putting the stock solution into an ultrasonic cleaning machine, and treating the stock solution for 20 minutes at the power of 400 w; after enzyme deactivation, 12000U/g ([ E ]/[ S ]) alkaline protease is added into the protein stock solution, after uniform mixing, enzymolysis is carried out for 5 hours at 50 ℃, enzyme deactivation is carried out, and one-step enzymolysis polypeptide solution is obtained; 10000U/g ([ E ]/[ S ]) flavourzyme is added into the polypeptide liquid subjected to the one-step enzymolysis, the enzymolysis is carried out for 5 hours at 50 ℃, the enzyme is deactivated, and the HSPS5 (which refers to the hemp seed polypeptide liquid obtained by the processing in the example 5) can be obtained after the centrifugation is carried out for 10min at 4000 r/min.

The peak shape and peak area of HSPS5 uric acid determined by RP-HPLC are shown in figure 1.

Example 6

Uniformly mixing the fructus cannabis meal and water according to a material-liquid ratio of 1:10, crushing and uniformly mixing the fructus cannabis meal by a colloid mill to obtain a fructus cannabis meal stock solution; preparing the stock solution into a proper pH value of 7.5, putting the stock solution into an ultrasonic cleaning machine, and treating the stock solution for 20 minutes at the power of 400 w; after enzyme deactivation, 12000U/g ([ E ]/[ S ]) alkaline protease is added into the protein stock solution, after uniform mixing, enzymolysis is carried out for 5 hours at 50 ℃, enzyme deactivation is carried out, and one-step enzymolysis polypeptide solution is obtained; 10000U/g ([ E ]/[ S ]) neutral protease is added into the polypeptide liquid obtained by the one-step enzymolysis, the enzymolysis is carried out for 5 hours at 50 ℃, the enzyme is deactivated, and the HSPS6 (which refers to the hemp seed polypeptide liquid obtained by the processing in the example 6) can be obtained after 10min of centrifugation at 4000 r/min.

The peak shape and peak area of HSPS6 uric acid determined by RP-HPLC are shown in figure 1.

Example 7

And replacing the polypeptide liquid with the fructus cannabis meal stock solution to be tested.

The peak shape and peak area of fructus Cannabis pulp stock solution uric acid determined by RP-HPLC method are shown in figure 1.

Example 8

Example 8 similar to examples 1 to 7 except that hemp seed meal and water were mixed at a feed-to-liquid ratio of 1:8 and alkaline protease was added in an amount of 10000U/g ([ E ]/[ S ]). The amount of lactic acid bacteria added was 2% of the lactic acid bacteria solution having an OD 0.8. Experiments show that the polypeptide liquid obtained in the example 8 has the function of obviously reducing uric acid.

Example 9

Example 9 similar to examples 1 to 7 except that hemp seed meal and water were mixed at a feed-to-liquid ratio of 1:12 and alkaline protease was added in an amount of 14000U/g ([ E ]/[ S ]). The amount of lactic acid bacteria added was 4% of lactic acid bacteria solution with OD 0.8. Experiments show that the polypeptide liquid obtained in example 9 has the effect of obviously reducing uric acid.

Example 10

Example 10 similar to examples 1 to 7 except that hemp seed meal and water were mixed at a feed-to-liquid ratio of 1:9 and alkaline protease was added in an amount of 11000U/g ([ E ]/[ S ]). The amount of papain added was 8000U/g ([ E ]/[ S ]). Experiments show that the polypeptide liquid obtained in example 10 has the effect of obviously reducing uric acid.

Example 11

Example 11 is similar to examples 1 to 7 except that hemp seed meal and water are mixed at a feed-to-liquid ratio of 1:12 and alkaline protease is added in an amount of 13000U/g ([ E ]/[ S ]). The amount of bromelain added was 12000U/g ([ E ]/[ S ]). Experiments show that the polypeptide liquid obtained in example 11 has the effect of obviously reducing uric acid.

Comparative example 1

20 mu M/L allopurinol replaces polypeptide liquid and is detected.

The peak shape and peak area of 20. mu.M/L allopurinol uric acid determined by RP-HPLC method are shown in FIG. 2.

Comparative example 2

Replacing the polypeptide liquid with 40 mu M/L allopurinol to be detected.

The peak shape and peak area of 40. mu.M/L allopurinol uric acid determined by RP-HPLC method are shown in FIG. 2.

Comparative example 3

60 mu M/L allopurinol replaces polypeptide liquid to be detected.

The peak shape and peak area of 60 μ M/L allopurinol uric acid determined by RP-HPLC are shown in FIG. 2.

As shown in FIGS. 1 and 2, the inhibitory effect of the polypeptides from HSPS2 to HSPS5 on uric acid is higher than 40 μ M allopurinol, wherein the inhibitory effect of HSPS4 is higher than 60 μ M allopurinol. Has obvious effect of reducing uric acid.