Method for removing water-soluble pesticide residues in catechin preparation process

Abstract

The invention relates to the field of deep processing of tea leaves and in particular relates to a method for removing water-soluble pesticide residues in a catechin preparation process. According to the method, part of the water-soluble pesticide residues bonded with macromolecular substances are removed while the macromolecular substances such as proteins, pectins and saccharides in tea soup are removed by virtue of inorganic ceramic film equipment; then, the rest of the water-soluble pesticide residues are effectively removed while the decaffeinated catechin is prepared by a polyamide resin column chromatography method. The method solves the problem of excessive pesticide residues, especially excessive water-soluble pesticide residues in a tea leaf extract, is suitable for general popularization and application in tea leaf deep processing enterprises, especially catechin producers, is relatively high in economic benefit, and has an important social meaning.

Description

technical field [0001] The invention relates to the field of tea deep processing, in particular to a method for removing water-soluble pesticide residues in the process of preparing catechins. Background technique [0002] Catechin is also called catechin, tea tannin. It is a derivative of flavanol, which was first proposed from catechin, and it belongs to the two important functional components in tea together with caffeine, but catechin is the most important component in tea soup. Catechin is a phenolic substance with obvious phenolic properties, accounting for about 75% to 80% of the content of tea polyphenols, and is also one of the sources of tea's bitter taste. Catechin is one of the main components that form the color and aroma of tea, and is also the most important health-care functional component in tea. Studies have shown that catechin has many functions such as preventing and treating cardiovascular diseases and preventing cancer. It is a reducing polyphenolic s...

AI Technical Summary

Problems solved by technology

However, the water extraction-column chromatography preparation method of catechin uses water as the extraction solvent, and a large amount of residual water-soluble pesticides (such as imidacloprid, acetamiprid, dimethoate, methamidophos, etc.) in tea leaves will be extracted at the same time , the conventional catechin preparation process is actually a process in which trace amounts of water-soluble pesticides in tea are concentrated and enriched, while the pesticide residue limit in catechin products is implemented according to the standards of tea, and qualified tea raw materials are extracted However, catechins often become products with serious pesticide residues exceeding the standard, resulting in serious obstacles to their export trade and restrictions on their application in domestic and foreign markets.

In addition, catechins are easily soluble in water, and are generally used as additives in water-based beverages or foods. The residual water-soluble pesticides in the beverages or foods are then dissolved in the beverages or foods and directly ingested by consumers, which may pose a threat to human health. Security risks

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