Wufeng Tianjian Plant product Co. Ltd_Home--Catechins belong to the flavan-3-ol class of flavonoids. Green tea catechins are the flavan-3-ols found in green tea leaves (Camellia sinensis). The major four catechins in green tea leaves are (-)-epigallocatechin gallate (EGCG), (-)-epicatechin gallate (ECG), (-)-epigallocatechin (EGC) and (-)-epicatechin (EC). They are all polyphenolic substances. Black tea leaves have a much lower content of these catechins. That's because black tea leaves undergo extensive fermentation, during which the majority of the catechins are enzymatically oxidized to the major pigments of black tea leaves, theaflavin and thearubigen. The green tea catechins make up approximately 30% of the dry weight of green tea leaves. Of the catechins, EGCG is the most abundant one in green tea leaves. Green tea, an aqueous infusion of green tea leaves, has been a popular beverage in China and Japan for centuries. In these countries, it is thought that green tea has a number of health-promoting benefits, and it is used in the management of various disorders. Epidemiological studies suggest that green tea may have cancer chemopreventive, as well as anti-atherogenic, properties. The possible health benefits of green tea are attributed to the catechins. These polyphenolic substances are antioxidants. EGCG appears to be the most potent antioxidant of all the green tea catechins.

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