Novel method for extracting tea polyphenol from tea

An extraction method and technology for tea polyphenols are applied in the field of extracting tea polyphenols to achieve the effects of reducing production costs, being convenient to operate, and avoiding extraction procedures.

Inactive Publication Date: 2010-02-03
李奇峰 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to literature search, there is no report on the extraction of tea polyphenols by mechanochemical extraction technology.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] At room temperature, mix 20kg of crushed tea powder with 2kg of sodium carbonate and 0.4kg of sodium borate; grind the mixture in a ball mill for 10 minutes; take out the ground powder, add 400L of water to it, and stir for 30 minutes; filter, take the supernatant, and add hydrochloric acid Adjust the pH value to 5.0; then pass through a macroporous resin chromatography column, concentrate, and dry to obtain tea polyphenol products with a product yield of >13%.

Embodiment 2

[0033] At room temperature, mix 20kg of tea raw materials with 2kg of sodium bicarbonate and 0.4kg of sodium borate; grind the mixture in a ball mill for 10 minutes; take out the ground powder, add 400L of water to it, and stir for 5 minutes; filter, take the supernatant, and add hydrochloric acid to adjust The pH value reaches 5.0; then passes through a macroporous resin chromatography column, concentrates, and dries to obtain a tea polyphenol product, and the product yield is >13%.

Embodiment 3

[0035]At room temperature, mix 20kg of tea raw materials with 2kg of potassium carbonate; grind the mixture in a ball mill for 5 minutes; take out the ground powder, add 400L of water to it, and stir for 5 minutes; filter, take the supernatant, add 2kg of calcium chloride, and stir to dissolve the chlorine Precipitation of calcium salt of tea polyphenols is obtained by calcium removal, and the precipitate is collected, and acid is added to adjust the pH to 5.0 to obtain redissolved tea polyphenols; after liquid-liquid extraction with ethyl acetate, the concentrated ethyl acetate phase is collected and dried to obtain tea polyphenols Product, product yield > 10%.

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PUM

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Abstract

The invention discloses a novel method for extracting tea polyphenol from tea, and the extraction method is as follows: mixing the tea raw materials and solid phase reagent (containing solid phase reaction reagent and protective agent) in the mass ratio of 1:0.01-2; grinding fully the mixture in a ball mill; taking out the grinded powder; adding water to dissolve; filtering; taking the supernatant; adjusting the pH value to 2.0-6.0; and separating and purifying to obtain the tea polyphenol. The invention has the advantages of environmental friendliness, high purity of products, little residueof solvent, convenient operation, short production cycle, low production cost and the like, thus being a method for extracting tea polyphenol from tea with better promotion and application prospect.

Description

(1) Technical field [0001] The invention relates to a new method for extracting tea polyphenols from tea leaves. (2) Technical background [0002] Tea polyphenols is the general term for polyhydric phenol derivatives in tea, accounting for 15% to 35% of the dry weight of tea; its chemical composition catechins accounts for about 70% of the total tea polyphenols, in addition to flavonoids and flavonoids Alcohols, anthocyanins and anthocyanins, phenolic acids and phenolic acids, etc. Tea polyphenols are an ideal natural antioxidant with a series of pharmacological functions such as anti-cancer, anti-aging, anti-radiation, scavenging free radicals in the human body, and lowering blood sugar and blood lipids. They are widely used in food processing, medical care, and daily chemical industries. Applications. [0003] At present, there are roughly four methods for the preparation of tea polyphenols: organic solvent extraction, metal ion precipitation, resin adsorption, CO 2 Sup...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D311/62
Inventor 李奇峰林美娇
Owner 李奇峰
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