Methods for refining decaffeinated EGCG and for preparing decaffeinated EGCG tea granules

Abstract

Provided are methods for refining a decaffeinated (-)-epigallocatechin gallate (EGCG for short, similarly hereinafter) effective component and for preparing decaffeinated EGCG tea granules, wherein the methods comprise extracting and refining the decaffeinated EGCG from tea leaves, tea dust or tea tree pruned branches and leaves and preparing the decaffeinated EGCG tea granules from the decaffeinated EGCG and combinative auxiliary materials; the process technology for preparing the decaffeinated EGCG is relatively mature, operations are simple, the cost is relatively low, and the market prospects are promised.

Description

technical field [0001] A refined (-)-epigallocatechin gallate (abbreviated as EGCG, the same below) active ingredient and a method for preparing decaffeinated EGCG tea granules, including extracting refined decaffeinated from tea leaves, tea powder or tea tree pruned branches and leaves EGCG and a method for preparing decaffeinated EGCG tea granules with adjuvants that can be combined. Background technique [0002] People advocate "return to nature" and pursue "natural, safe, nutritious and effective" food, and natural food is increasingly popular. Since caffeine is harmful to special populations such as pregnant women, children, the elderly, heart disease, insomnia, and neurasthenia, low-caffeine or decaffeinated tea drinks can reduce the adverse effects of caffeine on health , to expand the scope of use of the crowd. Therefore, decaffeinated products are more and more accepted by users at home and abroad, and the consumption in developed countries such as Europe and Nort...

AI Technical Summary

Problems solved by technology

[0003] The common methods of decaffeination are organic solvent method, ion precipitation method, column chromatography and other methods. Most of the processes use organic solvent treatment, which has the disadvantages of organic solvent residue and high cost.

[0004] The supercritical value of carbon dioxide is low, and small changes in pressure and temperature will cause a large change in fluid density, and it can easily penetrate into the tea leaves, so that the extraction components can be fully dissolved through distribution and diffusion, thereby achieving the purpose of extraction; but this method is industrialized. There are still many deficiencies in production, especially the refined EGCG with a purity of more than 90%, it is difficult to achieve the goal through pure carbon dioxide supercritical fluid extraction; secondly, the product cost is too high and the product lacks competitiveness

[0005] Tea contains more polyphenols such as caffeine and catechins, all of which contain more phenolic hydroxyl groups, which pose certain difficulties for the extraction and purification of EGCG