Method for extracting tea polyphenol with low caffeine, no pesticide residue and no ester from tea leaves

A technology with low caffeine and tea polyphenols, applied in the field of extracting low caffeine, ester-free tea polyphenols and no pesticide residues, can solve the problems of long extraction time, high energy consumption and high caffeine content, and achieves short extraction time, Low energy consumption and low environmental pollution

Active Publication Date: 2019-10-22
华茂(湖州)保健品有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, this process has the following problems: the extraction time is long, the energy consumption is high, and the caffeine content of the obtained product is still high

Method used

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  • Method for extracting tea polyphenol with low caffeine, no pesticide residue and no ester from tea leaves

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A method for extracting low caffeine, no pesticide residue, and no ester tea polyphenols from tea leaves, comprising the following steps:

[0034] Step 1: Select fresh green tea leaves, wash them, dry them naturally, grind them to pulverize, pass through a 40-mesh sieve after pulverization, and obtain tea powder;

[0035] Step 2: After raising the temperature of pure water to 90°C, add the tea powder obtained in step 1 and mix. The ratio of solid to liquid between tea powder and pure water is 1g:15ml. After circular countercurrent extraction for 60 minutes, filter, and collect the filtrate to obtain extract Ⅰ;

[0036] Step 3: Adsorb the extract Ⅰ obtained in step 2 through an adsorption resin AB-8 column, the column flow rate is 1BV / h, and then desorb with 100% ethanol to obtain desorption solution Ⅱ;

[0037] Step 4: Put the desorption liquid II mentioned in step 3 under the condition of 65°C, after recovering ethanol in a vacuum, pass through the adsorption resin SA-...

Embodiment 2

[0039] A method for extracting low caffeine, no pesticide residue, and no ester tea polyphenols from tea leaves, comprising the following steps:

[0040]Step 1: select fresh green tea leaves, wash them, dry them naturally, grind them to pulverize, pass through a 60-mesh sieve after pulverization, and obtain tea powder;

[0041] Step 2: After raising the temperature of pure water to 80°C, add β-cyclodextrin according to the ratio of solid-liquid ratio of 1g: 60ml, stir and dissolve, add sodium bicarbonate to adjust the pH of the aqueous solution to the range of 7.5~9.0, and add in step 1 to obtain Mix the tea powder, the solid-liquid ratio of the tea powder and pure water is 1g:20ml, filter after circular countercurrent extraction for 40min, collect the filtrate to obtain the extract Ⅰ;

[0042] Step 3: Adsorb the extract Ⅰ obtained in step 2 through the adsorption resin AB-8 column, the flow rate on the column is 1.5BV / h, and then desorb with 50% ethanol-water solution to obta...

Embodiment 3

[0045] A method for extracting low caffeine, no pesticide residue, and no ester tea polyphenols from tea leaves, comprising the following steps:

[0046] Step 1: select fresh green tea leaves, wash them, dry them naturally, grind them to pulverize, pass through an 80-mesh sieve after pulverization, and obtain tea powder;

[0047] Step 2: After raising the temperature of pure water to 70°C, add β-cyclodextrin according to the ratio of material to liquid: 1g: 70ml, stir and dissolve, add sodium bicarbonate to adjust the pH of the aqueous solution to the range of 7.5~9.0, and add in step 1 to obtain Mix the tea powder, the solid-liquid ratio of the tea powder and pure water is 1g:10ml, filter after leaching for 30min, collect the filtrate to obtain the extract Ⅰ;

[0048] Step 3: Adsorb the extract Ⅰ obtained in step 2 through an adsorption resin AB-8 column, the flow rate on the column is 2BV / h, and then desorb with 70% ethanol-water solution to obtain desorption solution Ⅱ;

...

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Abstract

Disclosed is a method for extracting tea polyphenol with low caffeine, no pesticide residue and no ester from tea leaves. The method includes the following steps: step one, selecting tea leaves, cleaning and drying the tea leaves, and crushing the tea leaves for a first time; step two, mixing the tea leaves after the first crushing with an aqueous solution, and carrying out annular countercurrentextraction and filtration to obtain an extract I; step three, adsorbing the extract I by adsorption resin, and desorbing the extract I with ethanol to obtain a desorption solution II; and step four, and adsorbing the desorption solution II by adsorption resin to obtain a finished product. The method of the scheme is simple in process, green and environmentally friendly. The obtained product has low caffeine content and no ester. Meanwhile, the method of the invention can remove pesticide residues and has high safety.

Description

technical field [0001] The invention belongs to the technical field of tea polyphenol extraction, and in particular relates to a method for extracting low-caffeine, pesticide residue-free and ester-free tea polyphenols from tea leaves. Background technique [0002] Tea polyphenols, also known as tea tannins and tea tannins, is a general term for a class of polyhydric phenolic compounds contained in tea, referred to as TP (teaupol yphenol), and its main components are catechins (flavanols) ) accounts for about 65-80% of the total amount of tea polyphenols, and is the primary component of many health care and pharmacological functions of tea. It is composed of 7 effective monomers, namely catechin (C), epicatechin (EC), Gallocatechin (GC), Epigallocatechin (EGC), Epigallocatechin Gallate (ECG), Epigallocatechin Gallate (EGCG) and dimers of EGCG. A large number of scientific studies at home and abroad have shown that catechin has many health care and pharmacological effects su...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07G99/00
CPCC07G99/00
Inventor 潘虎郑华方谷浩
Owner 华茂(湖州)保健品有限公司
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