Do you know Tea polyphenols ？

What is Tea polyphenols ?

Tea polyphenols determine the general term for polyphenols in tea leaves. It is a white amorphous powder, easily soluble in water, soluble in ethanol, methanol, acetone, ethyl acetate, and insoluble in chloroform. The content of tea polyphenols in green tea is relatively high, accounting for 15% to 30% of its mass. The main components of tea polyphenols are: flavanones, anthocyanins, flavonols and anthocyanins, phenolic acids and depsidic acids Class 6 compounds. Among them, flavanones (mainly catechins) are the most important, accounting for 60% to 80% of the total tea polyphenols, followed by flavonoids, and other phenolic substances accounts smaller.

Major compounds of Tea polyphenols

Tea polyphenols are the main components that determine the color, aroma, taste and efficacy of tea leaves, accounting for 20% to 30% of the dry weight of tea leaves. According to the main chemical components, tea polyphenols are divided into four categories: catechins, flavonoids, anthocyanins, and phenolic acids. Among them, catechins have the highest content, accounting for 60% to 80% of tea polyphenols. The catechins are mainly epicatechin (EC), epigallocatechin (EGC), epicatechin gallate (ECG) and epigallocatechin gallate (EGCG). Among them, gallocatechin (GC), epigallocatechin (EGC), epigallocatechin gallate (EGCG), epicatechin (EC), epicatechin gallate (ECG) 5 A compound is a key ingredient in tea quality control.

Physical character

During the extraction process, due to the oxidative polymerization of a small amount of tea polyphenols, they appear pale yellow to brown, with a slight tea aroma and astringency; It is easily soluble in ethanol, methanol and ethyl acetate , acetone, etc, slightly soluble in oil, insoluble in organic solvents such as benzene and chloroform; GTP is of good heat resistance, hygroscopic, stable at pH 2 to 7, and easy to oxidative polymerization under the conditions of light or pH > 8. Can form green-black compounds with iron ions

Tpyical green tea extract specification

Dosage in food