Preparation method of functional alcohol-soluble sturgeon cartilage preparation
阅读说明：本技术 一种功能性醇溶鲟鱼软骨制剂的制备方法 (Preparation method of functional alcohol-soluble sturgeon cartilage preparation ) 是由 袁丽 储倩 伍晓云 石彤 李欣 高瑞昌 于 2021-01-28 设计创作，主要内容包括：本发明属于水产品高值化利用领域,涉及一种功能性醇溶鲟鱼软骨制剂的制备方法；本发明通过前处理、高温液化、双酶分步酶解及醇提手段从鲟鱼软骨中得到具有醇溶性的软骨水解产物,以其对NO释放的抑制效果为分离评价指标,采用Sephadex G-15凝胶柱、ODS疏水层析柱对此水解产物进一步分离纯化,得到活性强、纯度高的醇溶性鲟鱼软骨抗炎肽；该肽组分对细胞活力未表现出明显影响,并能显著抑制LPS诱导的RAW264.7巨噬细胞中NO的释放；本发明在不完全破坏鲟鱼软骨原有加工路线的同时,有助于实现鲟鱼副产物高值化利用,具有广阔的市场前景。(The invention belongs to the field of high-value utilization of aquatic products, and relates to a preparation method of a functional alcohol-soluble sturgeon cartilage preparation; the method obtains the cartilage hydrolysate with alcohol solubility from the sturgeon cartilage by means of pretreatment, high-temperature liquefaction, double-enzyme stepwise enzymolysis and alcohol extraction, further separates and purifies the hydrolysate by using a Sephadex G-15 gel column and an ODS hydrophobic chromatographic column with the inhibiting effect on NO release as a separation evaluation index, and obtains the alcohol-soluble sturgeon cartilage anti-inflammatory peptide with strong activity and high purity; the peptide component has NO obvious influence on the cell activity, and can obviously inhibit the release of NO in RAW264.7 macrophage induced by LPS; the method provided by the invention is beneficial to realizing high-value utilization of sturgeon byproducts while not completely destroying the original processing route of the sturgeon cartilage, and has a wide market prospect.)
1. A preparation method of a functional alcohol-soluble sturgeon cartilage preparation is characterized by comprising the following steps:
(1) heating and boiling sturgeon cartilage, removing meat, lipid and fascia, cleaning, draining, and chopping the cartilage by using a low-temperature vacuum chopper mixer to obtain sturgeon cartilage particles;
(2) taking the sturgeon cartilage particles obtained in the step (1) to carry out liquefaction treatment in deionized water, so that proteins in the cartilage are transferred into liquid, and carrying out homogenization treatment after cooling to obtain a sturgeon cartilage hot-pressing extract;
(3) adjusting the content of soluble solids of the sturgeon cartilage hot-pressing extract obtained in the step (2) by using deionized water to obtain a mixed solution; the mass fraction of the soluble solid content in the mixed solution is 1-6%; adding trypsin into the mixed solution for enzymolysis, adding trypsin according to the content of soluble solid content in the mixed solution, adding 0.13g of trypsin into every 1g of soluble solid content, setting the enzymolysis temperature and pH of the trypsin for oscillating enzymolysis, and obtaining mixed solution E after enzymolysis;
then adding papain into the mixed solution E for enzymolysis, wherein the enzymolysis conditions are as follows: adding papain according to the content of soluble solids in the mixed solution, adding 0.1g papain to every 1g soluble solids, setting the enzymolysis temperature and pH of the papain, and carrying out oscillating enzymolysis; after enzymolysis is finished, heating the obtained enzymolysis liquid to a certain temperature to inactivate enzyme, then cooling to room temperature, centrifuging, collecting supernate, carrying out suction filtration, carrying out low-temperature freeze drying on the solution obtained after suction filtration, and obtaining a product, namely a sturgeon cartilage enzymolysis product;
(4) redissolving the sturgeon cartilage enzymolysis product obtained in the step (3) by using deionized water, uniformly stirring to obtain a mixed solution A, then adding absolute ethyl alcohol to obtain a mixed solution B, standing, centrifuging, taking supernate, carrying out low-pressure rotary evaporation to remove the ethyl alcohol, collecting the solution, and carrying out freeze drying treatment to obtain a product, namely a sturgeon cartilage alcohol-soluble hydrolysate;
(5) purifying the sturgeon cartilage alcohol-soluble hydrolysate in the step (4) by using a Sephadex G-15 gel column, using deionized water as an eluent, using an HD-A computer collector to monitor a light absorption value at 280nm in real time, collecting the purified components, and freeze-drying to obtain freeze-dried components;
(6) and (3) further purifying the freeze-dried components in the step (5) by using an ODS hydrophobic chromatography column, performing linear gradient elution by using ethanol as a mobile phase, monitoring a light absorption value in real time at 280nm by using an HD-A computer collector, collecting the purified components, and performing low-pressure rotary evaporation and freeze-drying to obtain a product, namely the alcohol-soluble sturgeon cartilage preparation containing the anti-inflammatory active peptide.
2. The method for preparing the functional alcohol-soluble sturgeon cartilage preparation according to claim 1, wherein the mass ratio of the sturgeon cartilage particles to the deionized water in the step (2) is 1 (1-2.5); the liquefaction temperature is 121 ℃, and the time is 90-120 min.
3. The method for preparing a functional alcohol-soluble sturgeon cartilage preparation according to claim 1, wherein the enzymolysis temperature of the trypsin in the step (3) is 37 ℃ and the enzymolysis pH is 7.0; the specific operation of the oscillating enzymolysis is as follows: the mixture is shaken at 200rpm in a constant temperature shaking table for 2 hours for enzymolysis.
4. The method for preparing a functional alcohol-soluble sturgeon cartilage preparation according to claim 1, wherein the papain in step (3) has an enzymatic hydrolysis temperature of 60 ℃ and an enzymatic hydrolysis pH of 7.0; the specific operation of the oscillating enzymolysis is as follows: the mixture is shaken at 200rpm in a constant temperature shaking table for 2 hours for enzymolysis.
5. The method for preparing a functional alcohol-soluble sturgeon cartilage preparation according to claim 1, wherein the heating in the step (3) is performed at a temperature of 90 ℃ for 20 min; the centrifugation conditions were: centrifuging at 10000rpm for 30min at 4 ℃.
6. The method for preparing a functional alcohol-soluble sturgeon cartilage preparation according to claim 1, wherein in the step (4), the concentration of the enzymolysis product in the mixed solution A is 20-200mg/mL, and the volume concentration of ethanol in the mixed solution B is 85-95%.
7. The method for preparing a functional alcohol-soluble sturgeon cartilage preparation according to claim 1, wherein in the step (4), the standing is performed at 4 ℃ for 24 hours; the centrifugation is carried out at 4 ℃ and 10000rpm for 30 min.
8. The method for preparing a functional alcohol-soluble sturgeon cartilage preparation according to claim 1, wherein in the step (5), the sample loaded during purification is a mixed solution of alcohol-soluble sturgeon cartilage hydrolysate and deionized water, and the sample concentration is 10-30 mg/mL; the column specification is 1.2cm × 50cm-1.2cm × 70cm, the flow rate is 0.8-1.2mL/min, and the sample loading volume is 1-2 mL.
9. The method for preparing a functional alcohol-soluble sturgeon cartilage preparation according to claim 1, wherein in the step (6), the sample loaded during purification is a mixed solution of a freeze-dried component and deionized water, and the sample concentration is 5-10 mg/mL; the column specification is 1.2cm multiplied by 50cm, the flow rate is 0.6-0.8mL/min, the sample loading volume is 1-2mL, the eluent comprises an eluent A and an eluent B, the eluent A is a 10% ethanol water solution, and the eluent B is a pure ethanol solution.
10. A functional alcogogogogogogogogogogue sturgeon cartilage preparation according to any of claims 1 to 9, characterized by comprising two polypeptides with anti-inflammatory potential whose amino acid sequences are given as SEQ ID No.1 and SEQ ID No. 2;
SEQ ID NO.1：Leu-Thr-Gly-Pro；
SEQ ID NO.2：Val-Gly-Pro-Ala-Gly-Pro-Ala-Gly-Pro。
Technical Field
The invention belongs to the field of high-value utilization of aquatic products, and particularly relates to a preparation method of a functional alcohol-soluble sturgeon cartilage preparation.
Background
The bioactive peptide is a special fragment containing 2-20 amino acid residues in protein, is mainly released from the protein by means of enzymatic hydrolysis, gastrointestinal digestion, fermentation and the like, and plays a role in hypertension resistance, immunoregulation, oxidation resistance, cancer resistance, bacteria resistance and the like due to different amino acid sequences, lengths, compositions, peptide structures and the like.
The bioactive peptide has wide source, including milk, egg, fish, rice, soybean, pea, chlorella, spirulina, oyster, mussel, etc. Wherein, the fish produces more than 60% of by-products in the processing process, including skin (1-3%), fish scales (5%), head (9-12%), viscera (12-18%), fragmentary muscle (15-20%), liver, bone (9-15%) and roe. These by-products are rich in protein and are often processed into low market value products such as animal feed, fish meal and manure. It is estimated that 1000 million tons of waste from aquatic products and meat (cattle, swine and poultry) are generated in average every year all over the world, which not only seriously increases economic costs, but also easily causes severe environmental problems. Therefore, how to recycle the byproducts and convert the intrinsic values (bioactive substances) into new products or health care products with better economic potential is a problem to be solved urgently.
According to the report of 'Chinese fishery statistics New year identification 2019', the sturgeon culture yield in 2018 is increased by 16.7% compared with that in 2017. However, most of the sturgeon by-products, such as cartilage known as "shark fins, sturgeon bones", are not fully utilized. The sturgeon cartilage accounts for 5.7% of the weight of the sturgeon cartilage, and is mostly discarded or used for crude extraction of chondroitin sulfate in the processing process, and little protein in the sturgeon cartilage is recycled. Therefore, how to realize the efficient utilization of the cartilage of the sturgeon is very important for the continuous development of the sturgeon. And at present, sturgeon cartilage byproduct anti-inflammatory activity is rarely studied.
Disclosure of Invention
In order to solve the problems, the invention takes NO inhibition rate as an index, and prepares the peptide with anti-inflammatory activity from waste cartilage. The invention firstly utilizes the alcohol extraction enzymolysis products of the sturgeon waste cartilage to separate and purify the anti-inflammatory activity, and then identifies the effective active peptide components to obtain two novel polypeptide sequences with anti-inflammatory potential.
The preparation method comprises the following steps:
(1) a pretreatment step: heating and boiling sturgeon cartilage, removing meat, lipid and fascia, cleaning, draining, and chopping the cartilage by using a low-temperature vacuum chopper mixer to obtain sturgeon cartilage particles;
(2) hot-pressing liquefaction: taking the sturgeon cartilage particles obtained in the step (1) to carry out liquefaction treatment in deionized water, so that proteins in the cartilage are transferred into liquid, and carrying out homogenization treatment after cooling to obtain a sturgeon cartilage hot-pressing extract;
(3) enzymolysis: adjusting the content of soluble solids of the sturgeon cartilage hot-pressing extract obtained in the step (2) by using deionized water to obtain a mixed solution; the mass fraction of the soluble solid content in the mixed solution is 1-6%; adding trypsin into the mixed solution for enzymolysis, adding trypsin according to the content of soluble solid content in the mixed solution, adding 0.13g of trypsin into every 1g of soluble solid content, setting the enzymolysis temperature and pH of the trypsin for oscillating enzymolysis, and obtaining mixed solution E after enzymolysis;
then adding papain into the mixed solution E for enzymolysis, wherein the enzymolysis conditions are as follows: adding papain according to the content of soluble solids in the mixed solution, adding 0.1g papain to every 1g soluble solids, setting the enzymolysis temperature and pH of the papain, and carrying out oscillating enzymolysis; after enzymolysis is finished, heating the obtained enzymolysis liquid to a certain temperature to inactivate enzyme, then cooling to room temperature, centrifuging, collecting supernate, carrying out suction filtration, carrying out low-temperature freeze drying on the solution obtained after suction filtration, and obtaining a product, namely a sturgeon cartilage enzymolysis product;
(4) alcohol extraction: redissolving the sturgeon cartilage enzymolysis product obtained in the step (3) by using deionized water, uniformly stirring to obtain a mixed solution A, then adding absolute ethyl alcohol to obtain a mixed solution B, standing, centrifuging, taking supernate, carrying out low-pressure rotary evaporation to remove the ethyl alcohol, collecting the solution, and carrying out freeze drying treatment to obtain a product, namely a sturgeon cartilage alcohol-soluble hydrolysate;
(5) purifying the sturgeon cartilage alcohol-soluble hydrolysate in the step (4) by using a Sephadex G-15 gel column, using deionized water as an eluent, using an HD-A computer collector to monitor a light absorption value at 280nm in real time, collecting the purified components, and freeze-drying to obtain freeze-dried components;
(6) further purifying the freeze-dried components in the step (5) by using an ODS hydrophobic chromatography column, performing linear gradient elution by using ethanol as a mobile phase, monitoring a light absorption value in real time at 280nm by using an HD-A computer collector, collecting the purified components, and performing low-pressure rotary evaporation and freeze-drying to obtain a product, namely the alcohol-soluble sturgeon cartilage preparation containing the anti-inflammatory active peptide;
preferably, the mass ratio of the sturgeon cartilage particles to the deionized water in the step (2) is 1 (1-2.5); the liquefaction temperature is 121 ℃, and the time is 90-120 min.
Preferably, the enzymolysis temperature of the trypsin in the step (3) is 37 ℃, and the enzymolysis pH is 7.0; the specific operation of the oscillating enzymolysis is as follows: the mixture is shaken at 200rpm in a constant temperature shaking table for 2 hours for enzymolysis.
Preferably, the enzymolysis temperature of the papain in the step (3) is 60 ℃, and the enzymolysis pH is 7.0; the specific operation of the oscillating enzymolysis is as follows: the mixture is shaken at 200rpm in a constant temperature shaking table for 2 hours for enzymolysis.
Preferably, the heating in the step (3) is carried out to a certain temperature of 90 ℃, and the time for inactivating the enzyme is 20 min; the centrifugation conditions were: centrifuging at 10000rpm for 30min at 4 ℃.
Preferably: in the step (4), the concentration of the enzymolysis product in the mixed solution A is 20-200mg/mL, and the volume concentration of ethanol in the mixed solution B is 85-95%;
preferably: in the step (4), the standing is carried out for 24 hours at 4 ℃; the centrifugation is carried out at 4 ℃ and 10000rpm for 30 min.
Preferably: in the step (5), the sample loaded during purification is a mixed solution of alcohol-soluble sturgeon cartilage hydrolysate and deionized water, and the sample concentration is 10-30 mg/mL; the column specification is 1.2cm multiplied by 50cm-1.2cm multiplied by 70cm, the flow rate is 0.8-1.2mL/min, and the sample loading volume is 1-2 mL;
preferably: in the step (6), the sample loaded during purification is a mixed solution of a freeze-dried component and deionized water, and the sample concentration is 5-10 mg/mL; the column specification is 1.2cm multiplied by 50cm, the flow rate is 0.6-0.8mL/min, the sample loading volume is 1-2mL, the eluent comprises an eluent A and an eluent B, the eluent A is a 10% ethanol water solution, and the eluent B is a pure ethanol solution.
LC-MS/MS identification of peptide sequences: identifying and analyzing polypeptide sequences of the alcohol-soluble sturgeon cartilage preparation containing the anti-inflammatory active peptide in the step (6) to obtain a plurality of polypeptides with anti-inflammatory potential, wherein the amino acid sequences of the two polypeptides are marked as SEQ ID NO.1 and SEQ ID NO. 2;
SEQ ID NO.1：Leu-Thr-Gly-Pro；
SEQ ID NO.2：Val-Gly-Pro-Ala-Gly-Pro-Ala-Gly-Pro。
the method for identifying the peptide sequence by LC-MS/MS comprises the following steps: carrying out reductive alkylation on ODS-3, desalting, and analyzing by liquid chromatography-mass spectrometry (LC-MS/MS); the liquid chromatographic column is Acclaim PepMap RPLC C18(150. mu. m.times.150 mm, 1.9 μm), mobile phase A: 0.1% formic acid, 2% Acetonitrile (ACN); comprises the following steps: 0.1% formic acid, 80% Acetonitrile (ACN);
mixing mobile phase A and mobile phase B for elution, wherein the elution procedure is as follows: 0-5min, the volume fraction of the mobile phase B is 6-9%; 5-20min, the volume fraction of the mobile phase B is 9% -14%; 20-50min, the volume fraction of the mobile phase B is 14% -30%; 50-58min, the volume fraction of the mobile phase B is 30-40%; 58-60min, and the volume fraction of the mobile phase B is 40% -95%. Adopting a De nove method to analyze a polypeptide sequence; two polypeptides with anti-inflammatory potential were obtained.
The invention has the following advantages and beneficial effects:
(1) the active peptide is prepared by adopting an enzyme method, the condition is mild, the anti-inflammatory activity of the active peptide can be kept as far as possible, and the alcohol precipitation part can be further processed to produce chondroitin sulfate;
(2) the results of the invention show that the alcohol-soluble sturgeon cartilage hydrolysate has anti-inflammatory effect, has no obvious cytotoxic effect, and has stronger anti-inflammatory activity compared with the original enzymolysis product through Sephadex G-15 gel column and ODS hydrophobic chromatography purification;
(3) the invention identifies and obtains two novel polypeptide sequences with anti-inflammatory potential from sturgeon cartilage for the first time;
(4) the invention expands the application range of the sturgeon, realizes the high added value of sturgeon by-products on one hand, and on the other hand, the sturgeon by-products can be used as a potential functional factor in the future, thereby having important significance for the development of industries such as food, medicine, health food and the like.
Drawings
FIG. 1 is an infrared (A) and ultraviolet (B) chromatogram of an alcohol-soluble sturgeon cartilage hydrolysate (ESCH) in example 5.
FIG. 2A is a graph showing the results of measurement of the effect of alcohol-soluble sturgeon cartilage hydrolysate (ESCH) on the viability of RAW264.7 cells in example 5; b is a graph showing the results of measurement of the influence of alcohol-soluble sturgeon cartilage hydrolysate (ESCH) on the NO release amount of RAW264.7 cells induced by LPS (lipopolysaccharide) in example 5.
In fig. 3, a is different components obtained by Sephadex G-15 column chromatography of the alcohol-soluble sturgeon cartilage hydrolysate (ESCH) in example 5, and after freeze-drying treatment, the sturgeon cartilage alcohol-soluble hydrolysates are respectively marked as F1, F2 and F3;
b is a graph showing the results of measurement of the effect of F1 on the NO release amount of LPS-induced RAW264.7 cells;
c is a graph showing the results of measurement of the effect of F2 on the NO release amount of LPS-induced RAW264.7 cells;
d is a graph showing the results of measurement of the effect of F3 on the NO release amount of LPS-induced RAW264.7 cells.
In FIG. 4, A is the different components obtained by ODS hydrophobic chromatography of the alcohol-soluble sturgeon cartilage hydrolysate (ESCH) in example 5, which are respectively marked as ODS-1, ODS-2, ODS-3, ODS-4:
b is a graph showing the results of measurement of the influence of ODS-1 on the NO release amount of LPS-induced RAW264.7 cells;
c is a graph showing the results of measurement of the influence of ODS-2 on the NO release amount of RAW264.7 cells induced by LPS;
d is a graph showing the results of measurement of the influence of ODS-3 on the NO release amount of LPS-induced RAW264.7 cells;
e is a graph showing the results of measurement of the effect of ODS-4 on the NO release from RAW264.7 cells induced by LPS.
Detailed Description
The invention is further illustrated by the following examples.
Example 1:
(1) heating sturgeon waste cartilage in boiling water for 20min, removing meat, lipid and fascia on the surface, washing with water, air drying, and pulverizing cartilage at 4 deg.C with a low temperature chopper mixer to obtain sturgeon cartilage particles;
(2) weighing 100g of sturgeon cartilage particles (the protein content is 9.44%), adding deionized water according to the proportion of 1:2(w/w), liquefying at 121 ℃ for 90min to transfer proteins in the cartilage into liquid, cooling, homogenizing by using a homogenizer for 30 s/time for 3 times to obtain a sturgeon cartilage hot-pressing extract;
(3) adjusting the protein content of the sturgeon cartilage hot-pressing extract obtained in the step (2) by using deionized water to obtain a mixed solution, adjusting the mass fraction of soluble solids in the mixed solution to be 6%, adding trypsin according to the content of the soluble solids in the mixed solution, wherein the mass fraction of the trypsin is 0.78% (0.13 g of trypsin is added to each 1g of soluble solids), setting the enzymolysis temperature of the trypsin to be 37 ℃, adjusting the pH to be 7.0, carrying out oscillation enzymolysis at 200rpm for 2 hours, and obtaining a mixed solution E after enzymolysis; then adding papain into the mixed solution E for enzymolysis, and similarly adding papain according to the content of soluble solids in the mixed solution, wherein the mass fraction of the papain is 0.6% (0.1 g of papain is added to every 1g of soluble solids), setting the enzymolysis temperature of the papain to be 60 ℃, the pH value to be 7.0, and carrying out oscillation enzymolysis for 2 hours at 200 rpm; after enzymolysis is finished, heating the obtained enzymolysis liquid to 90 ℃ for 20min to inactivate enzyme, then quickly cooling to room temperature through ice bath, centrifuging for 30min at 10000rpm under 4 ℃, collecting supernatant, carrying out suction filtration, and carrying out low-temperature freeze drying on the solution obtained after suction filtration to obtain a product, namely a sturgeon cartilage enzymolysis product;
(4) redissolving the sturgeon cartilage enzymolysis product by using deionized water, wherein the concentration is 20mg/mL, and placing the obtained mixed solution A on a magnetic stirrer at a set rotating speed of 500 until the sturgeon cartilage enzymolysis product is completely dissolved; adding absolute ethyl alcohol to obtain a mixed solution B, enabling the volume fraction of the absolute ethyl alcohol in the mixed solution B to be 85%, standing at 4 ℃ for 24h, centrifuging at 4 ℃ and 10000rpm for 30min, taking supernate, carrying out low-pressure rotary evaporation on the supernate at 45 ℃ to remove the ethyl alcohol, collecting the residual liquid, freeze-drying to obtain alcohol-soluble sturgeon cartilage hydrolysate (ESCH), and carrying out determination on the NO release inhibition effect;
determining the influence of the obtained alcohol-soluble sturgeon cartilage hydrolysate on the cell viability by a CCK-8 method, which comprises the following steps: RAW264.7 macrophages were seeded in 96-well plates with cell density adjusted to 1X 105Pore/pore volume of 100. mu.L in 5% CO2And cultured overnight in an incubator at 37 ℃. The medium was changed to a medium containing alcohol-soluble sturgeon cartilage hydrolysate (ESCH) at a concentration of 12.5-800 μ g/mL, and the control group was a medium containing no ESCH, while the zero-set group was set to contain no cells and only medium, and 3 wells were set at each concentration. After 24h incubation, 10. mu.L of CCK-8 working solution was added to each well. After incubation for 1h, the absorbance was measured at 450nm after gentle shaking. The Griess method for determining the NO release amount comprises the following steps: RAW264.7 cells were seeded in a 96-well plate with cell density adjusted to 1X 105Pore/pore volume of 100. mu.L in 5% CO2And cultured overnight in an incubator at 37 ℃. The culture medium is changed to a culture medium containing alcohol-soluble sturgeon cartilage hydrolysate (ESCH) with the concentration of 12.5-800 μ g/mL, and LPS (final concentration of 2 μ g/mL) is added after pretreatment for 2h to continue culture for 22 h. Collecting supernatant, determining NO release amount with NO kit (Bytime company), detecting OD value at 540nm with enzyme labeling instrument, and calculating NO content in cell supernatant according to standard curve;
(5) separating the alcohol-soluble sturgeon cartilage hydrolysate by using a Sephadex G-15 gel chromatographic column; the solvent during purification is deionized water; adding the freeze-dried powder into a solvent to be dissolved to obtain a sample; the column specification is 1.2cm × 70cm, the sample loading amount is 1mL (sample loading concentration is 30mg/mL), the flow rate is 0.8mL/min, deionized water is used for eluting, an HD-A computer collector is used for monitoring the light absorption value at 280nm in real time, components are collected, and freeze-drying is carried out to obtain freeze-dried components; measuring the NO release amount of different components after the action;
(6) and (3) further separating and purifying the freeze-dried components in the step (5) by using an ODS hydrophobic chromatography column, wherein the specification of the column is 1.2cm multiplied by 50cm, and an eluent comprises: the eluent A is 10% ethanol water solution, the eluent B is pure ethanol solution, the linear gradient elution; dissolving the freeze-dried powder in the step (5) in a 10% ethanol water solution to obtain a sample, wherein the sample loading amount is 1mL (the sample loading concentration is 10mg/mL), the flow rate is 0.8mL/min, monitoring the light absorption value at 280nm in real time by using an HD-A computer collector, collecting components, performing low-pressure rotary evaporation at 45 ℃ to remove ethanol, freeze-drying for later use, measuring the NO release amount, and obtaining the separation sub-component with the highest activity, namely the alcohol-soluble sturgeon cartilage preparation, wherein the alcohol-soluble anti-inflammatory active peptide of the sturgeon cartilage can be obtained by LC-MS/MS identification.
Example 2:
(1) heating sturgeon waste cartilage in boiling water for 20min, removing meat, lipid and fascia on the surface, washing with water, air drying, and pulverizing cartilage at 4 deg.C with a low temperature chopper mixer to obtain sturgeon cartilage particles;
(2) weighing 100g of sturgeon cartilage particles (the protein content is 9.44%), adding deionized water according to the proportion of 1:2(w/w), liquefying at 121 ℃ for 90min to transfer proteins in the cartilage into liquid, cooling, homogenizing by using a homogenizer for 30 s/time for 3 times to obtain a sturgeon cartilage hot-pressing extract;
(3) adjusting the protein content of the sturgeon cartilage hot-pressing extract obtained in the step (2) by using deionized water to obtain a mixed solution, adjusting the mass fraction of soluble solids in the mixed solution to be 1%, adding trypsin according to the content of the soluble solids in the mixed solution, wherein the mass fraction of the trypsin is 0.78% (0.13 g of trypsin is added to each 1g of soluble solids), setting the enzymolysis temperature of the trypsin to be 37 ℃, adjusting the pH to be 7.0, carrying out oscillation enzymolysis at 200rpm for 2 hours, and obtaining a mixed solution E after enzymolysis; then adding papain into the mixed solution E for enzymolysis, and similarly adding papain according to the content of soluble solids in the mixed solution, wherein the mass fraction of the papain is 0.6% (0.1 g of papain is added to every 1g of soluble solids), setting the enzymolysis temperature of the papain to be 60 ℃, the pH value to be 7.0, and carrying out oscillation enzymolysis for 2 hours at 200 rpm; after enzymolysis is finished, heating the obtained enzymolysis liquid to 90 ℃ for 20min to inactivate enzyme, then quickly cooling to room temperature through ice bath, centrifuging for 30min at 10000rpm under 4 ℃, collecting supernatant, carrying out suction filtration, and carrying out low-temperature freeze drying on the solution obtained after suction filtration to obtain a product, namely a sturgeon cartilage enzymolysis product;
(4) redissolving the sturgeon cartilage enzymolysis product by using deionized water, wherein the concentration is 200mg/mL, and placing the obtained mixed solution A on a magnetic stirrer at a set rotating speed of 500 until the sturgeon cartilage enzymolysis product is completely dissolved; adding absolute ethyl alcohol to obtain a mixed solution B, enabling the volume fraction of the absolute ethyl alcohol in the mixed solution B to be 85%, standing at 4 ℃ for 24h, centrifuging at 4 ℃ and 10000rpm for 30min, taking supernate, carrying out low-pressure rotary evaporation at 45 ℃ to remove the ethyl alcohol, collecting the residual liquid, freeze-drying to obtain an alcohol-soluble sturgeon cartilage hydrolysate (ESCH), and carrying out determination on the NO release inhibition effect;
determining the influence of the obtained alcohol-soluble sturgeon cartilage hydrolysate on the cell viability by a CCK-8 method, which comprises the following steps: RAW264.7 macrophages were seeded in 96-well plates with cell density adjusted to 1X 105Pore/pore volume of 100. mu.L in 5% CO2And cultured overnight in an incubator at 37 ℃. The medium was changed to a medium containing alcohol-soluble sturgeon cartilage hydrolysate (ESCH) at a concentration of 12.5-800 μ g/mL, and the control group was a medium containing no ESCH, while the zero-set group was set to contain no cells and only medium, and 3 wells were set at each concentration. After 24h incubation, 10. mu.L of CCK-8 working solution was added to each well. After incubation for 1h, the absorbance was measured at 450nm after gentle shaking. The Griess method for determining the amount of NO released comprises: RAW264.7 cells were seeded in a 96-well plate with cell density adjusted to 1X 105Pore/pore volume of 100. mu.L in 5% CO2And cultured overnight in an incubator at 37 ℃. The culture medium is changed to a culture medium containing alcohol-soluble sturgeon cartilage hydrolysate (ESCH) with the concentration of 12.5-800 μ g/mL, and LPS (final concentration of 2 μ g/mL) is added after pretreatment for 2h to continue culture for 22 h. The supernatant was collected, the amount of NO released was measured using an NO kit (Bytime Co.), the OD value was measured at 540nm using a microplate reader, and the NO content in the cell supernatant was calculated from the standard curve.
(5) Separating the alcohol-soluble sturgeon cartilage hydrolysate by using a Sephadex G-15 gel chromatographic column; the solvent during purification is deionized water; adding the freeze-dried powder into a solvent to be dissolved to obtain a sample; the column specification is 1.2cm multiplied by 50cm, the sample loading amount is 1mL (the sample loading concentration is 10mg/mL), the flow rate is 0.8mL/min, deionized water is used for eluting, an HD-A computer collector is used for monitoring the light absorption value at 280nm in real time, components are collected, and freeze-drying is carried out to obtain freeze-dried components; measuring the NO release amount of different components after the action;
(6) and (3) further separating and purifying the freeze-dried components in the step (5) by using an ODS hydrophobic chromatography column, wherein the specification of the column is 1.2cm multiplied by 50cm, and an eluent comprises: the eluent A is 10% ethanol water solution, the eluent B is pure ethanol solution, and the linear gradient elution is carried out. Dissolving the freeze-dried powder in the step (5) in a 10% ethanol water solution to obtain a sample, wherein the sample loading amount is 2mL (the sample loading concentration is 5mg/mL), the flow rate is 0.6mL/min, monitoring the light absorption value in real time at 280nm by using an HD-A computer collector, collecting components, performing low-pressure rotary evaporation at 45 ℃ to remove ethanol, freeze-drying for later use, measuring the NO release amount, and obtaining the separation sub-component with the highest activity, namely the alcohol-soluble sturgeon cartilage preparation, wherein the alcohol-soluble anti-inflammatory active peptide of the sturgeon cartilage can be obtained by LC-MS/MS identification.
Example 3:
(1) heating sturgeon waste cartilage in boiling water for 20min, removing meat, lipid and fascia on the surface, washing with water, air drying, and pulverizing cartilage at 4 deg.C with a low temperature chopper mixer to obtain sturgeon cartilage particles;
(2) weighing 100g of sturgeon cartilage particles (the protein content is 9.44%), adding deionized water according to the proportion of 1:2(w/w), liquefying at 121 ℃ for 90min to transfer proteins in the cartilage into liquid, cooling, homogenizing by using a homogenizer for 30 s/time for 3 times to obtain a sturgeon cartilage hot-pressing extract;
(3) adjusting the protein content of the sturgeon cartilage hot-pressing extract obtained in the step (2) by using deionized water to obtain a mixed solution, adjusting the mass fraction of soluble solids in the mixed solution to be 4%, adding trypsin according to the content of the soluble solids in the mixed solution, wherein the mass fraction of the trypsin is 0.78% (0.13 g of trypsin is added to each 1g of soluble solids), setting the enzymolysis temperature of the trypsin to be 37 ℃, adjusting the pH to be 7.0, carrying out oscillation enzymolysis at 200rpm for 2 hours, and obtaining a mixed solution E after enzymolysis; then adding papain into the mixed solution E for enzymolysis, and similarly adding papain according to the content of soluble solids in the mixed solution, wherein the mass fraction of the papain is 0.6% (0.1 g of papain is added to every 1g of soluble solids), setting the enzymolysis temperature of the papain to be 60 ℃, the pH value to be 7.0, and carrying out oscillation enzymolysis for 2 hours at 200 rpm; after enzymolysis is finished, heating the obtained enzymolysis liquid to 90 ℃ for 20min to inactivate enzyme, then quickly cooling to room temperature through ice bath, centrifuging for 30min at 10000rpm under 4 ℃, collecting supernatant, carrying out suction filtration, and carrying out low-temperature freeze drying on the solution obtained after suction filtration to obtain a product, namely a sturgeon cartilage enzymolysis product;
(4) redissolving the sturgeon cartilage enzymolysis product by using deionized water, wherein the concentration is 100mg/mL, and placing the obtained mixed solution A on a magnetic stirrer at a set rotating speed of 500 until the sturgeon cartilage enzymolysis product is completely dissolved; adding absolute ethyl alcohol to obtain a mixed solution B, enabling the volume fraction of the absolute ethyl alcohol in the mixed solution B to be 90%, standing at 4 ℃ for 24h, centrifuging at 4 ℃ and 10000rpm for 30min, taking supernate, carrying out low-pressure rotary evaporation on the supernate at 45 ℃ to remove the ethyl alcohol, collecting the residual liquid, and freeze-drying to obtain an alcohol-soluble sturgeon cartilage hydrolysate (ESCH), and determining the NO release inhibition effect;
determining the influence of the obtained alcohol-soluble sturgeon cartilage hydrolysate on cell viability by CCK-8 methodThe method comprises the following steps: RAW264.7 macrophages were seeded in 96-well plates with cell density adjusted to 1X 105Pore/pore volume of 100. mu.L in 5% CO2And cultured overnight in an incubator at 37 ℃. The medium was changed to a medium containing alcohol-soluble sturgeon cartilage hydrolysate (ESCH) at a concentration of 12.5-800 μ g/mL, and the control group was a medium containing no ESCH, while the zero-set group was set to contain no cells and only medium, and 3 wells were set at each concentration. After 24h incubation, 10. mu.L of CCK-8 working solution was added to each well. After incubation for 1h, the absorbance was measured at 450nm after gentle shaking. The Griess method for determining the NO release amount comprises the following steps: RAW264.7 cells were seeded in a 96-well plate with cell density adjusted to 1X 105Pore/pore volume of 100. mu.L in 5% CO2And cultured overnight in an incubator at 37 ℃. The culture medium is changed to a culture medium containing alcohol-soluble sturgeon cartilage hydrolysate (ESCH) with the concentration of 12.5-800 μ g/mL, and LPS (final concentration of 2 μ g/mL) is added after pretreatment for 2h to continue culture for 22 h. The supernatant was collected, the amount of NO released was measured using an NO kit (Bytime Co.), the OD value was measured at 540nm using a microplate reader, and the NO content in the cell supernatant was calculated from the standard curve.
(5) Separating the alcohol-soluble sturgeon cartilage hydrolysate by using a Sephadex G-15 gel chromatographic column; the solvent during purification is deionized water; adding the freeze-dried powder into a solvent to be dissolved to obtain a sample; the column specification is 1.2cm × 70cm, the sample loading amount is 1mL (sample loading concentration is 20mg/mL), the flow rate is 1.0mL/min, deionized water is used for eluting, an HD-A computer collector is used for monitoring the light absorption value at 280nm in real time, components are collected, and freeze-drying is carried out to obtain freeze-dried components; measuring the NO release amount of different components after the action;
(6) and (3) further separating and purifying the freeze-dried components in the step (5) by using an ODS hydrophobic chromatography column, wherein the specification of the column is 1.2cm multiplied by 50cm, and an eluent comprises: the eluent A is 10% ethanol water solution, the eluent B is pure ethanol solution, and the linear gradient elution is carried out. Dissolving the freeze-dried powder in the step (5) in a 10% ethanol water solution to obtain a sample, wherein the sample loading amount is 1.5mL (the sample loading concentration is 7.5mg/mL), the flow rate is 0.7mL/min, monitoring the light absorption value at 280nm in real time by using an HD-A computer collector, collecting components, performing low-pressure rotary evaporation at 45 ℃ to remove ethanol, performing freeze-drying for later use, determining the NO release amount, and obtaining the separation sub-component with the highest activity, namely the alcohol-soluble sturgeon cartilage preparation, wherein the alcohol-soluble anti-inflammatory active peptide of the sturgeon cartilage can be obtained by LC-MS/MS identification.
Example 4:
(1) heating sturgeon waste cartilage in boiling water for 20min, removing meat, lipid and fascia on the surface, washing with water, air drying, and pulverizing cartilage at 4 deg.C with a low temperature chopper mixer to obtain sturgeon cartilage particles;
(2) weighing 100g of sturgeon cartilage particles (the protein content is 9.44%), adding deionized water according to the proportion of 1:2.5(w/w), liquefying at 121 ℃ for 100min to transfer proteins in the cartilage into liquid, cooling, homogenizing by using a homogenizer for 30 s/time for 3 times to obtain a sturgeon cartilage hot-pressing extract;
(3) adjusting the protein content of the sturgeon cartilage hot-pressing extract obtained in the step (2) by using deionized water to obtain a mixed solution, adjusting the mass fraction of soluble solids in the mixed solution to be 5%, adding trypsin according to the content of the soluble solids in the mixed solution, wherein the mass fraction of the trypsin is 0.78% (0.13 g of trypsin is added to each 1g of soluble solids), setting the enzymolysis temperature of the trypsin to be 37 ℃, adjusting the pH to be 7.0, carrying out oscillation enzymolysis at 200rpm for 2 hours, and obtaining a mixed solution E after enzymolysis; then adding papain into the mixed solution E for enzymolysis, and similarly adding papain according to the content of soluble solids in the mixed solution, wherein the mass fraction of the papain is 0.6% (0.1 g of papain is added to every 1g of soluble solids), setting the enzymolysis temperature of the papain to be 60 ℃, the pH value to be 7.0, and carrying out oscillation enzymolysis for 2 hours at 200 rpm; after enzymolysis is finished, heating the obtained enzymolysis liquid to 90 ℃ for 20min to inactivate enzyme, then quickly cooling to room temperature through ice bath, centrifuging for 30min at 10000rpm under 4 ℃, collecting supernatant, carrying out suction filtration, and carrying out low-temperature freeze drying on the solution obtained after suction filtration to obtain a product, namely a sturgeon cartilage enzymolysis product;
(4) redissolving the sturgeon cartilage enzymolysis product by using deionized water, wherein the concentration is 20mg/mL, and placing the obtained mixed solution A on a magnetic stirrer at a set rotating speed of 500 until the sturgeon cartilage enzymolysis product is completely dissolved; adding absolute ethyl alcohol to obtain a mixed solution B, enabling the volume fraction of the absolute ethyl alcohol in the mixed solution B to be 95%, standing at 4 ℃ for 24h, centrifuging at 4 ℃ and 10000rpm for 30min, taking supernate, carrying out low-pressure rotary evaporation at 45 ℃ to remove the ethyl alcohol, collecting the residual liquid, and freeze-drying to obtain an alcohol-soluble sturgeon cartilage hydrolysate (ESCH), and determining the NO release inhibition effect;
determining the influence of the obtained alcohol-soluble sturgeon cartilage hydrolysate on the cell viability by a CCK-8 method, which comprises the following steps: RAW264.7 macrophages were seeded in 96-well plates with cell density adjusted to 1X 105Pore/pore volume of 100. mu.L in 5% CO2And cultured overnight in an incubator at 37 ℃. The medium was changed to a medium containing alcohol-soluble sturgeon cartilage hydrolysate (ESCH) at a concentration of 12.5-800 μ g/mL, and the control group was a medium containing no ESCH, while the zero-set group was set to contain no cells and only medium, and 3 wells were set at each concentration. After 24h incubation, 10. mu.L of CCK-8 working solution was added to each well. After incubation for 1h, the absorbance was measured at 450nm after gentle shaking. The Griess method for determining the NO release amount comprises the following steps: RAW264.7 cells were seeded in a 96-well plate with cell density adjusted to 1X 105Pore/pore volume of 100. mu.L in 5% CO2And cultured overnight in an incubator at 37 ℃. The culture medium is changed to a culture medium containing alcohol-soluble sturgeon cartilage hydrolysate (ESCH) with the concentration of 12.5-800 μ g/mL, and LPS (final concentration of 2 μ g/mL) is added after pretreatment for 2h to continue culture for 22 h. The supernatant was collected, the amount of NO released was measured using an NO kit (Bytime Co.), the OD value was measured at 540nm using a microplate reader, and the NO content in the cell supernatant was calculated from the standard curve.
(5) Separating the alcohol-soluble sturgeon cartilage hydrolysate by using a Sephadex G-15 gel chromatographic column; the solvent during purification is deionized water; adding the freeze-dried powder into a solvent to be dissolved to obtain a sample; the column specification is 1.2cm × 60cm, the sample loading amount is 1.5mL (sample loading concentration is 20mg/mL), the flow rate is 1.2mL/min, deionized water is used for elution, an HD-A computer collector is used for monitoring the light absorption value at 280nm in real time, components are collected, and freeze-drying is carried out to obtain freeze-dried components; measuring the NO release amount of different components after the action;
(6) and (3) further separating and purifying the freeze-dried components in the step (5) by using an ODS hydrophobic chromatography column, wherein the specification of the column is 1.2cm multiplied by 50cm, and an eluent comprises: the eluent A is 10% ethanol water solution, the eluent B is pure ethanol solution, and the linear gradient elution is carried out. Dissolving the freeze-dried powder in the step (5) in a 10% ethanol water solution to obtain a sample, wherein the sample loading amount is 1mL (the sample loading concentration is 10mg/mL), the flow rate is 0.8mL/min, monitoring the light absorption value at 280nm in real time by using an HD-A computer collector, collecting components, performing low-pressure rotary evaporation at 45 ℃ to remove ethanol, freeze-drying for later use, measuring the NO release amount, and obtaining the separation sub-component with the highest activity, namely the alcohol-soluble sturgeon cartilage preparation, wherein the alcohol-soluble anti-inflammatory active peptide of the sturgeon cartilage can be obtained by LC-MS/MS identification.
Example 5:
(1) heating sturgeon waste cartilage in boiling water for 20min, removing meat, lipid and fascia on the surface, washing with water, air drying, and pulverizing cartilage at 4 deg.C with a low temperature chopper mixer to obtain sturgeon cartilage particles;
(2) weighing 100g of sturgeon cartilage particles (the protein content is 9.44%), adding deionized water according to the proportion of 1:1(w/w), liquefying at 121 ℃ for 90min to transfer proteins in the cartilage into liquid, cooling, homogenizing by using a homogenizer for 30 s/time for 3 times to obtain a sturgeon cartilage hot-pressing extract;
(3) adjusting the protein content of the sturgeon cartilage hot-pressing extract obtained in the step (2) by using deionized water to obtain a mixed solution, adjusting the mass fraction of soluble solids in the mixed solution to be 6%, adding trypsin according to the content of the soluble solids in the mixed solution, wherein the mass fraction of the trypsin is 0.78% (0.13 g of trypsin is added to each 1g of soluble solids), setting the enzymolysis temperature of the trypsin to be 37 ℃, adjusting the pH to be 7.0, carrying out oscillation enzymolysis at 200rpm for 2 hours, and obtaining a mixed solution E after enzymolysis; then adding papain into the mixed solution E for enzymolysis, and similarly adding papain according to the content of soluble solids in the mixed solution, wherein the mass fraction of the papain is 0.6% (0.1 g of papain is added to every 1g of soluble solids), setting the enzymolysis temperature of the papain to be 60 ℃, the pH value to be 7.0, and carrying out oscillation enzymolysis for 2 hours at 200 rpm; after enzymolysis is finished, heating the obtained enzymolysis liquid to 90 ℃ for 20min to inactivate enzyme, then quickly cooling to room temperature through ice bath, centrifuging for 30min at 10000rpm under 4 ℃, collecting supernatant, carrying out suction filtration, and carrying out low-temperature freeze drying on the solution obtained after suction filtration to obtain a product, namely a sturgeon cartilage enzymolysis product;
(4) redissolving the sturgeon cartilage enzymolysis product by using deionized water, wherein the concentration is 100mg/mL, and placing the obtained mixed solution A on a magnetic stirrer at a set rotating speed of 500 until the sturgeon cartilage enzymolysis product is completely dissolved; adding absolute ethyl alcohol to obtain a mixed solution B, enabling the volume fraction of the absolute ethyl alcohol in the mixed solution B to be 85%, standing for 24h at 4 ℃, centrifuging for 30min at 4 ℃ and 10000rpm, taking supernate, carrying out low-pressure rotary evaporation at 45 ℃ to remove the ethyl alcohol, collecting the residual liquid, freeze-drying to obtain an alcohol-soluble sturgeon cartilage hydrolysate (ESCH), and determining that the molecular weight MW of 94.71% peptide components in the obtained alcohol-soluble sturgeon cartilage hydrolysate is less than 1.0 kDa;
determination of the inhibitory effect on NO release;
determining the influence of the obtained alcohol-soluble sturgeon cartilage hydrolysate on the cell viability by a CCK-8 method, which comprises the following steps: RAW264.7 macrophages were seeded in 96-well plates with cell density adjusted to 1X 105Pore/pore volume of 100. mu.L in 5% CO2And cultured overnight in an incubator at 37 ℃. The medium was changed to a medium containing alcohol-soluble sturgeon cartilage hydrolysate (ESCH) at a concentration of 12.5-800 μ g/mL, and the control group was a medium containing no ESCH, while the zero-set group was set to contain no cells and only medium, and 3 wells were set at each concentration. After 24h incubation, 10. mu.L of CCK-8 working solution was added to each well. After incubation for 1h, the absorbance was measured at 450nm after gentle shaking. The Griess method for determining the NO release amount comprises the following steps: RAW264.7 cells were seeded in a 96-well plate with cell density adjusted to 1X 105Pore/pore volume of 100. mu.L in 5% CO2And cultured overnight in an incubator at 37 ℃. Changing culture medium to culture medium containing alcohol soluble sturgeon cartilage hydrolysate (ESCH) with concentration of 12.5-800 μ g/mL, pretreating for 2 hr, and addingLPS (final concentration 2. mu.g/mL) was incubated for a further 22 h. The supernatant was collected, the amount of NO released was measured using an NO kit (Bytime Co.), the OD value was measured at 540nm using a microplate reader, and the NO content in the cell supernatant was calculated from the standard curve.
(5) Separating the alcohol-soluble sturgeon cartilage hydrolysate by using a Sephadex G-15 gel chromatographic column; the solvent during purification is deionized water; adding the freeze-dried powder into a solvent to be dissolved to obtain a sample; the column specification is 1.2cm × 70cm, the sample loading amount is 1mL (sample loading concentration is 20mg/mL), the flow rate is 0.8mL/min, deionized water is used for eluting, an HD-A computer collector is used for monitoring the light absorption value at 280nm in real time, components are collected, and freeze-drying is carried out to obtain freeze-dried components; measuring the NO release amount of different components after the action;
(6) and (3) further separating and purifying the freeze-dried components in the step (5) by using an ODS hydrophobic chromatography column, wherein the specification of the column is 1.2cm multiplied by 50cm, and an eluent comprises: the eluent A is 10% ethanol water solution, the eluent B is pure ethanol solution, and the linear gradient elution is carried out. Dissolving the freeze-dried powder in the step (5) in a 10% ethanol water solution to obtain a sample, wherein the sample loading amount is 2mL (the sample loading concentration is 10mg/mL), the flow rate is 0.8mL/min, monitoring the light absorption value in real time at 280nm by using an HD-A computer collector, collecting components, performing low-pressure rotary evaporation at 45 ℃ to remove ethanol, freeze-drying for later use, measuring the NO release amount, and obtaining the separation sub-component with the highest activity, namely the alcohol-soluble sturgeon cartilage preparation, wherein the alcohol-soluble anti-inflammatory active peptide of the sturgeon cartilage can be obtained by LC-MS/MS identification.
Example 6:
(1) heating sturgeon waste cartilage in boiling water for 20min, removing meat, lipid and fascia on the surface, washing with water, air drying, and pulverizing cartilage at 4 deg.C with a low temperature chopper mixer to obtain sturgeon cartilage particles;
(2) weighing 100g of sturgeon cartilage particles (the protein content is 9.44%), adding deionized water according to the proportion of 1:1.5(w/w), liquefying at 121 ℃ for 90min to transfer proteins in the cartilage into liquid, cooling, homogenizing by using a homogenizer for 30 s/time for 3 times to obtain a sturgeon cartilage hot-pressing extract;
(3) adjusting the protein content of the sturgeon cartilage hot-pressing extract obtained in the step (2) by using deionized water to obtain a mixed solution, adjusting the mass fraction of soluble solids in the mixed solution to be 6%, adding trypsin according to the content of the soluble solids in the mixed solution, wherein the mass fraction of the trypsin is 0.78% (0.13 g of trypsin is added to each 1g of soluble solids), setting the enzymolysis temperature of the trypsin to be 37 ℃, adjusting the pH to be 7.0, carrying out oscillation enzymolysis at 200rpm for 2 hours, and obtaining a mixed solution E after enzymolysis; then adding papain into the mixed solution E for enzymolysis, and similarly adding papain according to the content of soluble solids in the mixed solution, wherein the mass fraction of the papain is 0.6% (0.1 g of papain is added to every 1g of soluble solids), setting the enzymolysis temperature of the papain to be 60 ℃, the pH value to be 7.0, and carrying out oscillation enzymolysis for 2 hours at 200 rpm; after enzymolysis is finished, heating the obtained enzymolysis liquid to 90 ℃ for 20min to inactivate enzyme, then quickly cooling to room temperature through ice bath, centrifuging for 30min at 10000rpm under 4 ℃, collecting supernatant, carrying out suction filtration, and carrying out low-temperature freeze drying on the solution obtained after suction filtration to obtain a product, namely a sturgeon cartilage enzymolysis product;
(4) redissolving the sturgeon cartilage enzymolysis product by using deionized water, wherein the concentration is 100mg/mL, and placing the obtained mixed solution A on a magnetic stirrer at a set rotating speed of 500 until the sturgeon cartilage enzymolysis product is completely dissolved; adding absolute ethyl alcohol to obtain a mixed solution B, keeping the volume fraction of the absolute ethyl alcohol in the mixed solution B at 85%, standing at 4 ℃ for 24h, centrifuging at 4 ℃ and 10000rpm for 30min, taking supernate, carrying out low-pressure rotary evaporation at 45 ℃ to remove the ethyl alcohol, collecting the residual liquid, and freeze-drying to obtain an alcohol-soluble sturgeon cartilage hydrolysate (ESCH), and determining the NO release inhibition effect;
determining the influence of the obtained alcohol-soluble sturgeon cartilage hydrolysate on the cell viability by a CCK-8 method, which comprises the following steps: RAW264.7 macrophages were seeded in 96-well plates with cell density adjusted to 1X 105Pore/pore volume of 100. mu.L in 5% CO2And cultured overnight in an incubator at 37 ℃. The culture medium was changed to a culture medium containing alcohol-soluble sturgeon cartilage hydrolysate (ESCH) at a concentration of 12.5-800. mu.g/mL, controlThe group was media without ESCH, while the zero-set was set to contain no cells and media only, with 3 duplicate wells per concentration. After 24h incubation, 10. mu.L of CCK-8 working solution was added to each well. After incubation for 1h, the absorbance was measured at 450nm after gentle shaking. The Griess method for determining the NO release amount comprises the following steps: RAW264.7 cells were seeded in a 96-well plate with cell density adjusted to 1X 105Pore/pore volume of 100. mu.L in 5% CO2And cultured overnight in an incubator at 37 ℃. The culture medium is changed to a culture medium containing alcohol-soluble sturgeon cartilage hydrolysate (ESCH) with the concentration of 12.5-800 μ g/mL, and LPS (final concentration of 2 μ g/mL) is added after pretreatment for 2h to continue culture for 22 h. The supernatant was collected, the amount of NO released was measured using an NO kit (Bytime Co.), the OD value was measured at 540nm using a microplate reader, and the NO content in the cell supernatant was calculated from the standard curve.
(5) Separating the alcohol-soluble sturgeon cartilage hydrolysate by using a Sephadex G-15 gel chromatographic column; the solvent during purification is deionized water; adding the freeze-dried powder into a solvent to be dissolved to obtain a sample; the column specification is 1.2cm multiplied by 60cm, the sample loading amount is 1mL (sample loading concentration is 30mg/mL), the flow rate is 1.0mL/min, deionized water is used for eluting, an HD-A computer collector is used for monitoring the light absorption value at 280nm in real time, components are collected, and freeze-drying is carried out to obtain freeze-dried components; measuring the NO release amount of different components after the action;
(6) and (3) further separating and purifying the freeze-dried components in the step (5) by using an ODS hydrophobic chromatography column, wherein the specification of the column is 1.2cm multiplied by 50cm, and an eluent comprises: the eluent A is 10% ethanol water solution, the eluent B is pure ethanol solution, and the linear gradient elution is carried out. Dissolving the freeze-dried powder in the step (5) in a 10% ethanol water solution to obtain a sample, wherein the sample loading amount is 1mL (the sample loading concentration is 10mg/mL), the flow rate is 0.7mL/min, monitoring the light absorption value at 280nm in real time by using an HD-A computer collector, collecting components, performing low-pressure rotary evaporation at 45 ℃ to remove ethanol, freeze-drying for later use, measuring the NO release amount, and obtaining the separation sub-component with the highest activity, namely the alcohol-soluble sturgeon cartilage preparation, wherein the alcohol-soluble anti-inflammatory active peptide of the sturgeon cartilage can be obtained by LC-MS/MS identification.
FIG. 1 is an ultraviolet and infrared chromatogram of the sturgeon alcohol-soluble hydrolysate (ESCH) of example 5, and the result shows that ESCH has a typical polypeptide structure.
FIG. 2 shows the results of measurement of the activity of sturgeon alcohol-soluble hydrolysate (ESCH) on mouse peritoneal macrophage RAW264.7 cells and the NO release amount of RAW264.7 cells induced by LPS treatment in example 5. The results show that: when the ESCH concentration is in the range of 12.5-800 mug/mL, the compound has NO cytotoxic effect, and when the ESCH concentration is in the range of 50 mug/mL, the compound can remarkably inhibit the release of NO in mouse macrophages induced by LPS.
FIG. 3 shows the result of measuring NO release amount of RAW264.7 cells induced by LPS treatment of each component after the ESCH is subjected to Sephadex G-15 gel filtration chromatography. F3 significantly reduced the amount of NO released compared to the other two components, probably due to the stronger anti-inflammatory action of the peptide with the smaller molecular weight as the main component.
FIG. 4 is a graph showing the effect of the F3 fraction of FIG. 2 on the NO release amount of RAW264.7 cells induced by LPS after separation by ODS hydrophobic chromatography. Wherein, ODS-3(200 mug/mL) has higher inhibition rate than other components under the same concentration, which shows that the ODS-3 has better potential anti-inflammatory effect, namely the alcohol-soluble sturgeon cartilage preparation containing the anti-inflammatory active peptide.
Table 1 shows the molecular weight distribution of sturgeon alcohol-soluble hydrolysate (ESCH) in fig. 2.
The results show that more than 90% of ESCH is less than 1k Da.
Table 2 shows the sequences of two anti-inflammatory peptides in the ODS-3 component of FIG. 4.
The above embodiments are only used for illustrating the present invention, and do not limit the technical solutions described in the present invention; thus, while the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted; all such modifications and variations are intended to be included herein within the scope of this disclosure and the present invention and protected by the following claims.
Sequence listing
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<120> preparation method of functional alcohol-soluble sturgeon cartilage preparation
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