Method for preparing and extracting theabrownin by using tea leaves as raw material

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...

AI Technical Summary

Problems solved by technology

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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