CN114208912A - Extraction method and application of active ingredients in dark tea - Google Patents
Extraction method and application of active ingredients in dark tea Download PDFInfo
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- CN114208912A CN114208912A CN202111541276.7A CN202111541276A CN114208912A CN 114208912 A CN114208912 A CN 114208912A CN 202111541276 A CN202111541276 A CN 202111541276A CN 114208912 A CN114208912 A CN 114208912A
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- active ingredients
- black tea
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- tea
- extracting
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Abstract
The invention relates to the technical field of food processing, in particular to a method for extracting active ingredients from dark green tea and application thereof, which comprises the following steps: mixing black tea powder containing eurotium cristatum with water and iso-VC sodium, heating to 30-35 ℃, stirring, fermenting and pretreating for 36-48h, adding cellulase and pectinase, heating to 45-50 ℃, stirring, and performing enzymolysis for 3-6h to obtain a second extracting solution; adjusting pH of the second extractive solution to 6.0-6.5 with acidic pH regulator, adding protease and tannase, stirring for enzymolysis for 4-8 hr, cooling to 15-25 deg.C, and performing ultrasonic-assisted continuous countercurrent extraction; the solid residue is separated, and the pH is adjusted to 7.0-8.0 by using an alkaline pH regulator, and the invention improves the bioavailability of the dark green tea by adopting a facultative biological coupling synthase assisted low-temperature countercurrent extraction method, has high extraction efficiency and high active ingredient retention degree.
Description
Technical Field
The invention relates to the technical field of food processing, in particular to an extraction method and application of active ingredients in black tea.
Background
The black tea is a unique tea formed by the processing process and quality of six Chinese teas with microorganisms, is a microbial fermented tea in the true sense and belongs to post-fermented tea. The black tea mainly produced in China in Hunan, Yunnan, Hubei, Sichuan, Guangxi, Zhejiang, Guizhou provinces and other provinces mainly comprises Fuzhuan tea, Liupao tea, Pu' er tea, black brick tea and the like due to different processes of picking, pressing and processing of fresh leaves. During the links of pile fermentation, flowering, storage and the like in the primary preparation of the dark green tea, microorganisms such as eurotium cristatum (eurotium cristatum) participate in the fermentation process of biochemical component metabolism and quality formation, and the fermentation process is a key factor for creating the complex chemical substance composition of the dark green tea. The dark tea contains various natural active ingredients such as tea polyphenol, catechin, amino acid, caffeine, tea polysaccharide and the like, and has the effects of resisting oxidation, reducing blood sugar and blood fat, improving intestinal microorganisms, resisting tumors, increasing aroma, improving high-yield enzyme activity and the like together with the golden flower fungus and functional substances generated by fermentation and metabolism of the golden flower fungus. However, natural active ingredients such as polyphenol oxidase, golden flower fungus and metabolites thereof in the dark tea are not resistant to high temperature and have low content, the drinking amount needs to be more than 20g every day to play the effects of reducing fat and losing weight, and excessive theophylline or caffeine stimulates the stomach and intestine to easily cause discomfort, so that the dark tea is extracted by adopting a proper process to become a current research hotspot.
At present, the extraction process of natural active ingredients in the dark green tea mainly comprises a solvent extraction method, a supercritical fluid extraction method, an ultrasonic-assisted extraction method, a microwave-assisted extraction method and the like, wherein a solvent for extraction comprises boiling water, ethanol, an organic solvent and the like, and the loss of heat-sensitive active ingredients such as eurotium cristatum and metabolites thereof, natural enzymes (polyphenol oxidase and the like) of the dark green tea can be caused when the boiling water is used as the solvent for extracting the active ingredients of the dark green tea; the ethanol is used as a solvent to extract fat-soluble active ingredients in the black tea, and the organic solvent extraction method has high production cost and is easy to cause pollution, meanwhile, the product cannot meet the requirements of food additives and the pharmaceutical industry on safety and the like, the content of natural active ingredients in the black tea is low, the direct extraction efficiency is low, the production cost is high, and the activity of the extracted substances is easy to destroy.
Disclosure of Invention
The purpose of the invention is as follows: aiming at the technical problems, the invention provides an extraction method and application of active ingredients in black tea.
The adopted technical scheme is as follows:
a method for extracting active ingredients from dark tea comprises the following steps:
s1: crushing the black tea containing the eurotium cristatum, mixing the obtained black tea powder with water and iso-VC sodium, heating to 30-35 ℃, and carrying out stirring fermentation pretreatment for 36-48h by using the eurotium cristatum contained in the black tea to obtain a first extracting solution;
s2: adding cellulase and pectinase into the first extract, heating to 45-50 deg.C, stirring, and performing enzymolysis for 3-6 hr to obtain a second extract;
s3: adjusting pH of the second extractive solution to 6.0-6.5 with acidic pH regulator, adding protease and tannase, stirring for enzymolysis for 4-8 hr, cooling to 15-25 deg.C, and transferring to countercurrent extraction equipment;
s4: taking the same volume of water as an extracting solution, carrying out continuous countercurrent extraction, wherein the countercurrent extraction temperature is less than or equal to 40 ℃, the countercurrent extraction time is 5-10h, intermittently starting auxiliary ultrasonic equipment in the extraction process, setting the ultrasonic power to be 100W-300W, carrying out ultrasonic extraction for 40-60min each time, stopping the ultrasonic extraction for 20-40min, then starting the ultrasonic equipment again, and intermittently starting the ultrasonic equipment until the extraction is finished to obtain a third extracting solution;
s5: separating solid residue in the third extractive solution to obtain fourth extractive solution, adjusting pH of the fourth extractive solution to 7.0-8.0 with alkaline pH regulator, filtering with multi-stage membrane, sterilizing, concentrating at low temperature, and drying to obtain active ingredient.
Further, the weight ratio of the black tea powder to the water in the S1 is 1: 6 to 12 percent, wherein the dosage of the iso-VC sodium is 0.5 to 1 percent of the weight of the black tea powder.
Furthermore, the dosage of the cellulase and the pectinase in the S2 accounts for 100-200u/g and 60-150u/g of the weight of the black tea powder respectively.
Further, in S3, the acidic pH adjuster is any one of citric acid, acetic acid, oxalic acid, tartaric acid, malic acid, and lactic acid.
Furthermore, the dosage of the protease and the tannase in the S3 accounts for 150-300u/g and 50-120u/g of the weight of the black tea powder respectively.
Further, ultrasonic auxiliary treatment is also simultaneously carried out during the continuous countercurrent extraction in S4, the ultrasonic power is 100-300W, and the time is 30-60 min.
Further, in S5, the alkaline pH adjuster is any one of sodium hydroxide, potassium hydroxide, sodium carbonate, sodium bicarbonate, and potassium carbonate.
Further, the drying mode in S5 is freeze drying or low-temperature spray drying, and the water content of the obtained active ingredients is less than or equal to 6%.
The active ingredients in the dark tea extracted by the extraction method are applied to preparing lipid-lowering and weight-losing food, medicines or health-care products.
The invention has the beneficial effects that:
(1) according to the invention, the active ingredients of the dark tea are obtained by adopting a facultative biological coupling synthase auxiliary low-temperature countercurrent extraction method, and the main ingredients of the dark tea comprise L-theanine, tea polyphenol, theophylline, theaflavin, gallocatechin, caffeine, catechin and the like (refer to figure 1) through high-resolution LC-MS analysis, and tests show that the main ingredients are improved to different degrees after the coupling of the biological enzyme, so that the bioavailability of the dark tea is improved.
(2) The method can retain the delicate flavor amino acids in the black tea, simultaneously the bitter and astringent tannic acid is degraded by the single enzyme, the extracted active ingredients of the black tea have rich taste and lasting fragrance, and can be completely dissolved in water (ice water, hot water and normal temperature water), and the tea soup after re-dissolution is clear and bright, has low bitter and astringent feeling, fresh taste and high fragrance (refer to figures 2, 3 and 4).
(3) The active ingredients extracted by the invention can enhance the de-epinephrine-induced lipolysis in adipose tissues, reduce the activity of pancreatic lipase, enhance the decomposition of lipid droplets and do not influence the activity of hormone-sensitive lipase, thereby inhibiting the occurrence and development of obesity and hyperlipidemia, and can be used for developing functional foods by compounding other vegetables powder, plant glycopeptide, fruit powder and the like, and the application range is wide.
Drawings
FIG. 1 is an LC-MS spectrum of the active ingredient extracted in example 1;
wherein 1 is L-theanine; 2 is tea polyphenol; 3 is theophylline; 4 is theaflavin; 5 is gallocatechin; 6 is caffeine; 7 is catechin.
FIG. 2 is an HPLC chromatogram of the active ingredient extracted in example 1;
FIG. 3 is an HPLC chromatogram of the extracted active ingredient in the comparative example;
FIG. 4 is a graph of water-infused substance of the active ingredient extracted in example 1 at different temperatures;
wherein 1 is brewed by ice water at 0 ℃; 2, infusing with boiling water at 100 ℃; 3 is brewed with water at the normal temperature of 20 ℃.
FIG. 5 is a schematic representation of the active ingredient extracted in example 1;
Detailed Description
The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.
Example 1:
a method for extracting active ingredients from dark tea comprises the following steps:
the production method comprises the following steps of (1) crushing Fuzhuan tea (Fuzhuan tea, which belongs to black tea, also called fermented tea ancestor and contains honeysuckle) by using a crusher, sieving by using a 24-mesh sieve, putting obtained black tea powder, water and iso-VC sodium into a stirring tank for mixing, wherein the weight ratio of the black tea powder to the water is 1: 8, adding cellulase and pectinase into the first extracting solution in a stirring tank, wherein the dosages of the cellulase and the pectinase are 120u/g and 100u/g of the weight of the black tea powder respectively, heating to 46 ℃, stirring for enzymolysis for 4h to obtain a second extracting solution, adjusting the pH of the second extracting solution to 6.5 by using citric acid, adding protease and tannase, wherein the dosages of the protease and the tannase are 150u/g and 60u/g of the weight of the black tea powder respectively, continuously stirring for enzymolysis for 6h, cooling to 20 ℃, transferring to a countercurrent extraction device, taking water with the same volume as the extracting solution, carrying out continuous countercurrent extraction, controlling the temperature of the extracting solution to be less than or equal to 40 ℃ by using circulating water in a jacket of the countercurrent extraction device, the method comprises the steps of preventing the temperature of an extract liquid from rising too high in the ultrasonic-assisted extraction process, enabling the countercurrent extraction time to be 9 hours, simultaneously carrying out ultrasonic-assisted treatment, enabling the ultrasonic power to be 180W, enabling the ultrasonic-assisted treatment time to be 60min, stopping ultrasonic for 30min, starting ultrasonic start-stop circulation again until extraction is finished, obtaining a third extract liquid, separating solid residues in the third extract liquid, obtaining a fourth extract liquid, adjusting the pH of the fourth extract liquid to 8.0 by using sodium bicarbonate, carrying out multistage membrane filtration, degerming, low-temperature concentration and freeze drying, and obtaining active ingredients with the water content of less than or equal to 6%.
Example 2:
a method for extracting active ingredients from dark tea comprises the following steps:
the production method comprises the following steps of (1) crushing Fuzhuan tea (Fuzhuan tea, which belongs to black tea, also called fermented tea ancestor and contains honeysuckle) by using a crusher, sieving by using a 24-mesh sieve, putting obtained black tea powder, water and iso-VC sodium into a stirring tank for mixing, wherein the weight ratio of the black tea powder to the water is 1: 12, adding cellulase and pectinase into the first extracting solution in a stirring tank, wherein the dosages of the cellulase and the pectinase are 200u/g and 150u/g of the weight of the black tea powder respectively, heating to 50 ℃, stirring for enzymolysis for 6h to obtain a second extracting solution, adjusting the pH of the second extracting solution to 6.5 by using citric acid, adding protease and tannase, wherein the dosages of the protease and the tannase are 300u/g and 120u/g of the weight of the black tea powder respectively, continuously stirring for enzymolysis for 8h, cooling to 25 ℃, transferring to a countercurrent extraction device, taking water with the same volume as the extracting solution, carrying out continuous countercurrent extraction, controlling the temperature of the extracting solution to be less than or equal to 40 ℃ by using circulating water in a jacket of the countercurrent extraction device, the method comprises the steps of preventing the temperature of an extract liquid from rising too high in the ultrasonic-assisted extraction process, enabling the countercurrent extraction time to be 9 hours, simultaneously carrying out ultrasonic-assisted treatment, enabling the ultrasonic power to be 300W, enabling the ultrasonic-assisted treatment time to be 60 minutes, starting ultrasonic start-stop circulation again after ultrasonic is suspended for 30 minutes until extraction is finished, obtaining a third extract liquid, separating solid residues in the third extract liquid, obtaining a fourth extract liquid, adjusting the pH of the fourth extract liquid to 8.0 by using sodium bicarbonate, carrying out multistage membrane filtration, degerming and low-temperature concentration, and carrying out freeze drying, so as to obtain an active ingredient with the water content of less than or equal to 6%.
Example 3:
a method for extracting active ingredients from dark tea comprises the following steps:
the production method comprises the following steps of (1) crushing Fuzhuan tea (Fuzhuan tea, which belongs to black tea, also called fermented tea ancestor and contains honeysuckle) by using a crusher, sieving by using a 24-mesh sieve, putting obtained black tea powder, water and iso-VC sodium into a stirring tank for mixing, wherein the weight ratio of the black tea powder to the water is 1: 6, adding cellulase and pectinase into the first extracting solution in a stirring tank, wherein the dosages of the cellulase and the pectinase are 100u/g and 60u/g of the weight of the black tea powder respectively, heating to 45 ℃, stirring for enzymolysis for 3 hours to obtain a second extracting solution, adjusting the pH of the second extracting solution to 6.0 by using citric acid, adding protease and tannase, wherein the dosages of the protease and the tannase are 150u/g and 50u/g of the weight of the black tea powder respectively, continuously stirring for enzymolysis for 4 hours, cooling to 15 ℃, transferring to a countercurrent extraction device, taking water with the same volume as the extracting solution, carrying out continuous countercurrent extraction, controlling the temperature of the extracting solution to be less than or equal to 40 ℃ by using circulating water in a jacket of the countercurrent extraction device, the method comprises the steps of preventing the temperature of an extract liquid from rising too high in the ultrasonic-assisted extraction process, enabling the countercurrent extraction time to be 5 hours, simultaneously carrying out ultrasonic-assisted treatment, enabling the ultrasonic power to be 100W, enabling the ultrasonic-assisted treatment time to be 40min, stopping the ultrasonic treatment for 20min, starting an ultrasonic start-stop cycle again until the extraction is finished, obtaining a third extract liquid, separating solid residues in the third extract liquid, obtaining a fourth extract liquid, adjusting the pH of the fourth extract liquid to 7.0 by using sodium bicarbonate, carrying out multistage membrane filtration, sterilization, low-temperature concentration and freeze drying, and obtaining active ingredients with the water content of less than or equal to 6%.
Comparative example
The comparative example is essentially the same as example 1 except that no cellulase, pectinase, protease, tannase were added.
And (3) testing the quality:
the total amount of water extract, the content of tea polyphenol, the content of free amino acids and turbidity of the active ingredients prepared in examples 1 to 3 of the present invention and comparative example were measured.
Total amount of water extract: tea water extract is adopted for determination (GB/T8305-2018).
Turbidity: the measurement is carried out by using WGZ-200 scattered light turbidimeter.
The content of tea polyphenol: ferrous tartrate colorimetry (GB/T8313-2018) is adopted.
Total amount of free amino acids: ninhydrin colorimetric method (GB/T8314-2013) is adopted.
The test results are shown in table 1 below:
table 1:
as can be seen from table 1 above, the present invention has higher extraction efficiency for various active ingredients in dark tea than the comparative example, and various active ingredients can be retained to the maximum extent.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (9)
1. The method for extracting the active ingredients from the dark tea is characterized by comprising the following steps:
s1: crushing the black tea containing the eurotium cristatum, mixing the obtained black tea powder with water and iso-VC sodium, heating to 30-35 ℃, and carrying out stirring fermentation pretreatment for 36-48h by using the eurotium cristatum contained in the black tea to obtain a first extracting solution;
s2: adding cellulase and pectinase into the first extract, heating to 45-50 deg.C, stirring, and performing enzymolysis for 3-6 hr to obtain a second extract;
s3: adjusting pH of the second extractive solution to 6.0-6.5 with acidic pH regulator, adding protease and tannase, stirring for enzymolysis for 4-8 hr, cooling to 15-25 deg.C, and transferring to countercurrent extraction equipment;
s4: taking the same volume of water as an extracting solution, carrying out continuous countercurrent extraction, wherein the countercurrent extraction temperature is less than or equal to 40 ℃, the countercurrent extraction time is 5-10h, intermittently starting auxiliary ultrasonic equipment in the extraction process, setting the ultrasonic power to be 100W-300W, carrying out ultrasonic extraction for 40-60min each time, stopping the ultrasonic extraction for 20-40min, then starting the ultrasonic equipment again, and starting the ultrasonic equipment intermittently until the extraction is finished;
s5: separating solid residue in the third extractive solution to obtain fourth extractive solution, adjusting pH of the fourth extractive solution to 7.0-8.0 with alkaline pH regulator, filtering with multi-stage membrane, sterilizing, concentrating at low temperature, and drying to obtain active ingredient.
2. The method for extracting active ingredients from black tea as claimed in claim 1, wherein the weight ratio of the black tea powder to water in S1 is 1: 6 to 12 percent, wherein the dosage of the iso-VC sodium is 0.5 to 1 percent of the weight of the black tea powder.
3. The method for extracting active ingredients from black tea as claimed in claim 1, wherein the dosage of cellulase and pectinase in S2 is respectively 100u/g and 60-150u/g of the black tea powder.
4. The method for extracting active ingredients from dark tea as claimed in claim 1, wherein the acidic pH adjusting agent in S3 is any one of citric acid, acetic acid, oxalic acid, tartaric acid, malic acid, and lactic acid.
5. The method for extracting active ingredients from black tea as claimed in claim 1, wherein the amounts of protease and tannase in S3 are respectively 150-300u/g and 50-120u/g based on the weight of the black tea powder.
6. The method for extracting active ingredients from dark tea as claimed in claim 1, wherein the continuous countercurrent extraction in S4 is performed with ultrasonic auxiliary treatment at an ultrasonic power of 100-300W for 30-60 min.
7. The method for extracting active ingredients from dark tea as claimed in claim 1, wherein the alkaline pH adjusting agent in S5 is any one of sodium hydroxide, potassium hydroxide, sodium carbonate, sodium bicarbonate and potassium carbonate.
8. The method for extracting active ingredients from dark tea as claimed in claim 1, wherein the drying manner in S5 is freeze drying or low temperature spray drying, and the water content of the obtained active ingredients is 6% or less.
9. Use of the active ingredients in the dark tea extracted by the extraction method according to any one of claims 1 to 8 in preparing lipid-lowering and weight-losing food, medicine or health-care products.
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