In green tea, the polyphenolic fraction is mostly composed of catechins; they are the major components of fresh tea leaves, as well as of the soluble matter in green tea. Crude catechin powder is obtainable by treating tea leaves with water and organic solvents. The total catechin content of this crude product is a little more than 90%. The green tea catechin (GTC) fraction is then submitted to liquid chromatography to isolate four different catechin compounds.
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