Method for removing caffeine and pesticide residue in tea extract

A tea extract and tea extraction technology, applied in tea, food science, tea alkali content reduction, etc., can solve the problems of loss of effective components of tea polyphenols, failure to achieve good results, large amount of ethanol, etc., to avoid toxicity and harm Effects of solvent residue, improvement of health quality, and saving of ethanol consumption

Active Publication Date: 2014-03-26
TIANJIN TASLY GROUP
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0016] Research on microbial degradation of caffeine was reported in the early 1970s, probably because caffeine was regarded as a toxic substance by bacteria. Since then, research on caffeine as a microbial growth substrate has continued to make new progress, but not very well. Effect
[0017] In addition, the published literature also includes the extraction of caffeine in tea leaves by ethanol, but the purpose is to extract caffeine, not to remove caffeine in tea extracts, and this method has the advantages of large amount of ethanol, high cost, strong risk, Disadvantages such as a large loss of active ingredients such as tea polyphenols
[0018] The above several methods have great limitations for the preparation of decaffeinated tea extracts, so it is useful to study decaffeinated tea extracts with high efficiency and meet the conditions of large-scale production. For this reason, the present invention provides a A method for preparing decaffeinated tea extract that is adaptable to large-scale production and has high decaffeination efficiency

Method used

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  • Method for removing caffeine and pesticide residue in tea extract
  • Method for removing caffeine and pesticide residue in tea extract
  • Method for removing caffeine and pesticide residue in tea extract

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] Take 1 kg of Pu'er tea extract (purchased on the market or prepared according to the method of water extraction in the prior art) a, add 6 liters of 95% ethanol for reflux extraction, and filter; continue to add 6 liters of 95% ethanol for reflux extraction, filter; Add 6 liters of 95% ethanol to reflux extraction, filter;

[0056] After the filter residue is dried, the tea extract b is obtained for subsequent use;

[0057] The extract obtained from the three extractions is concentrated and crystallized, filtered, and the filter residue is dried to obtain crude caffeine; the filtrate is concentrated and added to tea extract b, and the ethanol is evaporated to obtain a low-caffeine, low-pesticide Pu-erh tea extract.

Embodiment 2

[0059] Take 1 kg of Pu'er tea extract (purchased on the market or prepared according to the method of water extraction in the prior art) a, add 6 liters of 80% ethanol for reflux extraction, filter; continue to add 6 liters of 80% ethanol for reflux extraction, and filter the filter residue; Add 6 liters of 80% ethanol for reflux extraction, filter, wherein the ethanol is used for each extraction;

[0060] After the filter residue is dried, the tea extract b is obtained for subsequent use;

[0061] The extract obtained from the three extractions is concentrated and crystallized, filtered, and the filter residue is dried to obtain crude caffeine; the filtrate is concentrated and added to tea extract b, and the ethanol is evaporated to obtain a low-caffeine, low-pesticide Pu-erh tea extract.

Embodiment 3

[0063] Take 1 kg of Pu'er tea extract (purchased on the market or prepared according to the method of water extraction in the prior art) a, add 6 liters of absolute ethanol for reflux extraction, and filter; continue to add 6 liters of anhydrous ethanol for reflux extraction, filter; Add 6 liters of absolute ethanol for reflux extraction, filter, wherein the ethanol is recycled;

[0064] After the filter residue is dried, the tea extract b is obtained for subsequent use;

[0065] The extract obtained from the three extractions is concentrated and crystallized, filtered, and the filter residue is dried to obtain crude caffeine; the filtrate is concentrated and added to tea extract b, and the ethanol is evaporated to obtain a low-caffeine, low-pesticide Pu-erh tea extract.

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Abstract

The invention relates to a tea extract refining technology, and in particular relates to a method for removing caffeine and pesticide in tea extract through a low-toxicity organic reagent which is low in alcohol or similar in polarity, so as to obtain low-caffeine tea extract.

Description

technical field [0001] The invention relates to the refining technology of tea extracts, in particular to the removal of caffeine and residual pesticides in tea extracts to obtain tea extracts with low caffeine, and belongs to the field of food processing. Background technique [0002] Tea extract mainly contains tea polyphenols, amino acids, tea polysaccharides, caffeine and trace elements. [0003] Caffeine is a xanthine alkaloid compound and a central nervous system stimulant. High doses of caffeine can stimulate the central nervous system, affect sleep, increase blood pressure, and increase the prevalence of rheumatoid arthritis. [0004] In recent years, there have been some low-caffeine or decaffeinated teas in foreign markets, which allows people to enjoy the pleasure of drinking tea while rejecting the adverse effects of caffeine on health as much as possible. [0005] The caffeine in tea is slightly different due to the type of tea, the age of leaves, different soi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A23F3/36A23F3/20
Inventor 陈庆闯刘顺航何忠荣戚亚辉贾黎晖
Owner TIANJIN TASLY GROUP
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