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Method for extracting tea polyphenol from tea leaf production wastes

A technology for producing waste and tea polyphenols, applied in the direction of organic chemistry and the like, can solve the problems of low price, not yet effectively developed and utilized, large amount of tea production waste, etc., and achieves the effect of simple method, easy realization and low cost.

Inactive Publication Date: 2017-08-01
CHONGQING CHENYANG AGRI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are many reports on the methods of extracting tea polyphenols at home and abroad, but most of the raw materials are tea leaves, and the production waste of tea leaves is large and the price is low, so it has not been effectively developed and utilized.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Example 1: crush and sieve the tea waste, and reflux leaching in 45% ethanol at 60°C for 0.5h, filter the leaching solution to obtain a purified solution; add 3.21g of zinc chloride to the purified solution , 2.53g of sodium carbonate precipitated, and the precipitate was filtered to obtain the finished product; using an electric heating constant temperature blast drying oven and a vacuum pump for circulating water, the finished product was vacuum-dried at 80°C for 3 hours to obtain a pure product, and the pure product was decompressed The crude product was obtained by distillation; the crude product was extracted in 1.21 g of potassium sodium tartrate, 5.11 g of potassium dihydrogen phosphate, and 1.71 g of ferrous sulfate to obtain a tea polyphenol acidification solution.

Embodiment 2

[0015] Example 2: crush and sieve the tea waste, and reflux leaching in 48% ethanol at 65°C for 0.8h, filter the leaching solution to obtain a purified solution; add 3.86g of zinc chloride to the purified solution , 2.78g of sodium carbonate precipitated, and the precipitate was filtered to obtain the finished product; using an electric heating constant temperature blast drying oven and a vacuum pump for circulating water, the finished product was vacuum-dried at 90°C for 4 hours to obtain a pure product, and the pure product was decompressed The crude product was obtained by distillation; the crude product was extracted in 1.97 g of potassium sodium tartrate, 5.56 g of potassium dihydrogen phosphate, and 1.46 g of ferrous sulfate to obtain a tea polyphenol acidification solution.

Embodiment 3

[0016] Example 3: Tea waste was crushed and sieved, and refluxed in 50% ethanol for 1 hour under the condition of 70° C., and the leaching solution was filtered to obtain a purified solution; in the purified solution, 4.53 g of zinc chloride, 3.56g of sodium carbonate was precipitated, and the precipitate was filtered to obtain the finished product; the finished product was vacuum-dried at 100°C for 5 hours using an electric heating constant temperature blast drying oven and a vacuum pump for circulating water to obtain a pure product, which was distilled under reduced pressure The crude product was obtained; the crude product was extracted in 2.53 g of potassium sodium tartrate, 6.22 g of potassium dihydrogen phosphate, and 2.33 g of ferrous sulfate to obtain a tea polyphenol acidification solution.

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PUM

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Abstract

The invention relates to a method for extracting tea polyphenol from tea leaf production wastes. The method comprises the following steps of crushing and screening the tea leaf wastes, refluxing and extracting in ethanol, and filtering the extracting solution, so as to obtain the purifying solution; adding zinc chloride and sodium carbonate precipitate into the purifying solution according to a certain ratio, and filtering the precipitate, so as to obtain a finished product; drying the finished product under the vacuum environment, so as to obtain a pure product; relieving pressure and distilling the pure product, so as to obtain a crude product; extracting the crude product in seignette salt, monopotassium phosphate and ferrous sulfate, so as to obtain the tea polyphenol acidifying solution. The method has the advantages that the method is simple, the cost is low, the implementing is easy, the extracting speed is high, and the purity is high.

Description

technical field [0001] The invention relates to the technical field of tea processing, in particular to a method for extracting tea polyphenols from tea production waste. Background technique [0002] my country is a big tea-producing country with a history of more than 4,000 years. A large amount of tea waste and its processing leftovers have not been well utilized, causing huge losses. The active phenolic substances and their derivatives contained in tea are collectively called tea polyphenols (Tea. Polyphenols, TP), also known as tea tannins. The content in tea is generally 20%-30%, and the content in tea production waste is generally about 15%. Tea polyphenol is a light brown to white amorphous powder, which is easily soluble in water, methanol, ethanol, acetic acid Polar organic solvents such as ethyl ester and glacial acetic acid, but insoluble in non-polar solvents such as benzene, chloroform and petroleum ether. TP has a strong antioxidant effect and a wide range ...

Claims

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Application Information

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IPC IPC(8): C07G99/00C07D311/62
CPCC07D311/62C07G99/00
Inventor 腾洪彬周阳
Owner CHONGQING CHENYANG AGRI TECH CO LTD
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