Technology for preparing high content tea polyphenol using water as single solvent

Abstract

The invention relates to a technology for preparing high content tea polyphenols using water as a single solvent, especially to a technological combination which uses tea as raw materials and water as the single solvent, and comprises steps of: performing extraction, separation and condensation at a low temperature; performing refrigeration and deposition to prepare liquid tea polyphenols; furtherly drying and preparing solid tea polyphenols. The preparative solid tea polyphenols in powder form of the present invention have a tea polyphenol content greater than 90% and a catechin content greater than 60%; and the prepared liquid tea polyphenol extracts have a tea polyphenol content greater than 40% and a catechin content greater than 25%. The invention has a short technological process and all operations before drying can be performed at low temperatures; low concentrated solution viscosity is in favor of precipitation and deposition of tea polyphenols; the prepared products keep no organic solvent residuals and have shallow colors and a high content of tea polyphenol.

Description

technical field [0001] The invention relates to a preparation process of high-content tea polyphenols, in particular to a process for preparing liquid tea polyphenols by using tea leaves as raw materials and using only water as a single solvent through low-temperature extraction, separation and concentration, refrigerated precipitation, and further drying to prepare solid tea polyphenols. The combination of processes, the prepared solid powder tea polyphenols contain more than 90% tea polyphenols and 60% catechins, and the prepared liquid tea polyphenols extracts contain more than 40% tea polyphenols and catechins Greater than 25%. Background technique [0002] In the world, tea (Camellia sinensis), as a traditional fast-consumption drink with health care function, has been paid more and more attention and love by people. Tea contains complex chemical components, among which the most important is tea polyphenols. [0003] Tea polyphenols are a kind of phenolic active ingre...

AI Technical Summary

Problems solved by technology

[0008] Both the organic solvent extraction method and the metal ion precipitation method need to use organic solvents or inorganic salts other than water, such as chloroform, ethyl acetate, calcium hydroxide, etc., and it is difficult to remove the residue of organic solvents during the drying process

Resin column chromatography and supercritical CO 2 The extraction method has low transfer rate and low work efficiency of tea polyphenols