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Method for extracting low-caffeine high-content tea polyphenol from fresh tea

A technology of fresh tea leaves and low caffeine, applied in the direction of reducing the alkali content of tea, can solve the problems of high equipment investment and high operating costs, and achieve the effects of short production cycle, high separation efficiency and simple operation.

Active Publication Date: 2014-05-28
CHENGDU WAGOTT BIO TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method has the disadvantages of high equipment investment and high operating costs.

Method used

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  • Method for extracting low-caffeine high-content tea polyphenol from fresh tea

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Embodiment 1: a kind of method extracting low-caffeine high-content tea polyphenols from fresh tealeaves, it comprises the following steps:

[0024] S1. Leaching: 2000kg of fresh tea leaves are placed in an extractor, 16000kg of ethyl acetate is added, soaked at a constant temperature for 3h, and the mixed solution in the extractor is passed through a 18-mesh sieve to obtain a filtrate; wherein, the soaking temperature at a constant temperature is 50°C;

[0025] S2. Primary evaporation and concentration: heat the filtrate to 70°C, evaporate and concentrate for 110 minutes, and obtain a solid-liquid mixture, that is, a primary evaporation concentrate;

[0026] S3. Water sinking: add the primary evaporation concentrate into purified water, and discard the solid after water sinking, and the solid content of the obtained liquid reaches 4-6%; wherein, the weight ratio of the primary evaporation concentrate to purified water is 1:4;

[0027] S4. CF filtration: use CF filter ...

Embodiment 2

[0033] Embodiment 2: a kind of method extracting low-caffeine high-content tea polyphenols from fresh tealeaves, it comprises the following steps:

[0034] S1. Leaching: 2000kg of fresh tea leaves are placed in an extractor, 20000kg of ethyl acetate is added, soaked at a constant temperature for 4h, and the mixed solution in the extractor is passed through a 24 mesh sieve to obtain a filtrate; wherein, the constant temperature soaking temperature is 60°C;

[0035] S2. Primary evaporation and concentration: heat the filtrate to 70-75°C, evaporate and concentrate for 130 minutes, and obtain a solid-liquid mixture, that is, a primary evaporation concentrate;

[0036] S3. Water sinking: add the primary evaporation concentrate to purified water, and discard the solid after water sinking. The solid content of the obtained liquid reaches 6%; wherein, the weight ratio of the primary evaporation concentrate to purified water is 1:8;

[0037] S4. CF filtration: Use CF filter to filter ...

Embodiment 3

[0043] Embodiment 3: a kind of method extracting low-caffeine high-content tea polyphenols from fresh tea leaves, it comprises the following steps:

[0044] S1. Leaching: 2000kg of fresh tea leaves are placed in an extractor, 18000kg of ethyl acetate is added, soaked at a constant temperature for 3.5 hours, and the mixed solution in the extractor is passed through a 20-mesh sieve to obtain a filtrate; wherein, the constant temperature soaking temperature 55°C;

[0045] S2. Primary evaporation and concentration: heat the filtrate to 70-75°C, evaporate and concentrate for 120 minutes, and obtain a solid-liquid mixture, that is, a primary evaporation concentrate;

[0046] S3. Water sinking: adding the primary evaporation concentrate to purified water, and discarding the solid after water sinking, the obtained liquid has a solid content of 5%; wherein, the weight ratio of the primary evaporation concentrate to purified water is 1:6;

[0047] S4. CF filtration: Use CF filter to fi...

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Abstract

The invention discloses a method for extracting low-caffeine high-content tea polyphenol from fresh tea, belonging to the technical field of chemistry of natural products. The method comprises the following concrete steps: S1, extraction; S2, primary evaporative concentration; S3, water precipitation; S4, CF filtration; S5, resin adsorption; S6, membrane concentration; S7, secondary evaporative concentration; S8, spray drying; and S9, deironing. According to the invention, fresh tea is used as a raw material, and the disadvantages of easy pasting and uneasy filtration during extraction of crushed and sieved dry tea at a high temperature in the prior art is overcome; purified water is used as a medium for direct separation of low-caffeine high-content tea polyphenol, and leaching of a plurality of fat-soluble pesticides is reduced; the product prepared by using the method has caffeine content of lower than 1% and tea polyphenol content of 99.8%. The method has the advantages of simple operation, high separation efficiency, low cost and a short production period and is suitable for industrialized large-scale production.

Description

technical field [0001] The invention belongs to the technical field of natural product chemistry, and in particular relates to a method for extracting tea polyphenols with low caffeine and high content from fresh tea leaves. Background technique [0002] Tea polyphenols (TP) is a new type of natural antioxidant extracted from tea, which has a series of important pharmacological functions such as anti-cancer, anti-aging, anti-radiation, scavenging free radicals, and lowering blood sugar and blood lipids. It has broad application prospects in oil, food, medicine, daily chemical and other fields. Tea polyphenols are a mixture of various catechin monomers, among which the active ingredient that is highly anti-oxidant, anti-cancer and scavenging free radicals in the body is epigallocatechin gallate (EGCG), which is recognized worldwide as It is "the most ideal anticancer drug extracted from natural plants after paclitaxel". In October 2006, the U.S. Food and Drug Administration...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A23F3/38
Inventor 顾峰
Owner CHENGDU WAGOTT BIO TECH
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