Method for preparing and extracting theabrownin by using tea leaves as raw material
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A technology for theabrownin and tea leaves, applied in the field of preparation and extraction of theabrownin, can solve the problems of high energy consumption cost, less theabrownin, complex components, etc., and achieves overcoming the variety of organic solvents, reducing the production cost, and improving the recovery rate. Effect
Active Publication Date: 2014-04-09
RED RIVER TANGREN BIOLOGY DEV
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At present, there are few production and preparation technologies of theabrownin. The main methods are to use fresh tea leaves as raw materials to adopt fermentation method or to extract and purify various organic solvents from black tea such as Pu'er tea. Due to the complex composition of raw materials, these methods The removal of impurities and organic solvents in the downstream of the preparation process, the purification of the target product, etc. have cumbersome processes, high energy costs, and serious environmental pollution
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Embodiment 1
[0023] A method for preparing and extracting theabrownin from tea leaves, comprising the following steps:
[0024] (1) Take 20g of ordinary green tea (or other tea varieties), grind it into flakes, put it into a beaker, pour 200ml of 90-100% pure water into it, and heat it to maintain a constant temperature for 60 minutes, then extract the liquid, and repeat the extraction once under the same conditions;
[0025] (2) heating and concentrating the above-mentioned 400ml extract to 150ml;
[0026] (3) Add 150ml of concentrated solution from the previous step to 150ml of chloroform solution for extraction, leaving 150ml of the lower aqueous layer;
[0027] (4) inject 150ml of the water layer in the previous step into the airtight melting vessel and carry out the oxidative polymerization reaction for 60min;
[0028] (5) After the oxidative polymerization reaction is completed, distill and dry to obtain 5.35 g of fine theabrownin in a solid state of more than 80%.
Embodiment 2
[0030] A method for preparing and extracting theabrownin from tea leaves, comprising the following steps:
[0031] (1) Take 20g of ordinary green tea (or other tea varieties), grind it into flakes, put it into a beaker, pour 100ml of 70-80% pure water into it, and keep it at a constant temperature for 40 minutes with heating, then extract the liquid, and repeat the extraction once under the same conditions;
[0032] (2) Heat and concentrate the above-mentioned 200ml extract to 150ml;
[0033] (3) Add 150ml of the concentrate from the previous step to 150ml of chloroform solution for extraction, leaving 150ml of the lower aqueous layer;
[0034] (4) Inject 150ml of the water layer in the previous step into a closed melting vessel for oxidative polymerization for 30min;
[0035] (5) After the oxidative polymerization reaction is completed, distill and dry to obtain 4.45 g of solid theabrownin fine product with a theabrownin content of more than 80%.
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Abstract
The invention discloses a method for preparing and extracting theabrownin by using tea leaves as a raw material. The method comprises the steps of (1) crushing the tea leaves, putting the crushed tea leaves into an extraction container, and injecting purified water for soaking to obtain extract liquor for later use; (2) cooling the extract liquor, and filtering the extract liquor by using a straight film to remove fiber impurities; (3) performing membrane concentration; (4) extracting a dichloromethane solution at normal temperature to remove caffeine, and taking a lower-level water layer; (5) injecting the lower-level water layer into the container to perform an oxidative polymerization reaction; (6) performing vacuum concentration on the solution to obtain a concentrated solution with the concentration of 20-50%; (7) performing spray drying on the concentrated solution to obtain dry powder; and (8) putting the obtained dry powder into a CO2 supercritical environment to remove trace impurities and trace organic solvents, and then drying to ensure that the water content of the dry powder is less than 4%, thereby obtaining a solid theabrownin product. The method disclosed by the invention has the advantages that the content of theabrownin is increased, the manufacturing cost is reduced, the recovery rate is increased, and the problems that a variety of organic solvents are used in the prior art, the number of residual organic solvents is large and the like are solved.
Description
technical field [0001] The invention belongs to the technical field of tea deep processing, in particular to a method for preparing and extracting theabrownin from tea leaves. Background technique [0002] Theabrownin can effectively reduce blood lipids, blood sugar and blood viscosity, and has a significant effect on the prevention of cardiovascular and cerebrovascular diseases and diabetes. It can be used as raw materials for food and health products, and has wide application prospects. At present, there are few production and preparation technologies of theabrownin. The main methods are to use fresh tea leaves as raw materials to adopt fermentation method or to extract and purify various organic solvents from black tea such as Pu'er tea. Due to the complex composition of raw materials, these methods In the downstream of the preparation process, the removal of impurities and organic solvents, and the purification of the target product are cumbersome, high energy costs, and...
Claims
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