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English Abstract
Journal Article
[Quantitative analysis of (-)-epigallocatechin gallate in tea leaves by high-performance liquid chromatography].
The quantitative analysis of (-)-epigallocatechin gallate (EGCG) in tea (Camellia sinensis L.) was performed by high-performance liquid chromatography (HPLC) with a C-18 reversed-phase column. EGCG was then eluted within 20 min by using methanol-water-acetic acid (20:75:5 (v/v/v)) as an eluent. As an internal standard, tryptophan was used. The content of EGCG in five kinds of green tea (sencha, gyokuro, bancha, matsucha and oolong tea) and in a cup of those was determined by both the extraction method with 50% (v/v) methanol and the infusion method with water. The largest amount of EGCG was obtained from matsucha by the extraction method, or from sencha by the infusion method. Furthermore, EGCG contents in various parts of the tea plant were examined. The first leaf had the highest concentration of EGCG, and the concentration of EGCG decreased with the aging of the leaf.
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