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Production of theasinensins A and D, epigallocatechin gallate dimers of black tea, by oxidation–reduction dismutation of dehydrotheasinensin A

✍ Scribed by Takashi Tanaka; Sayaka Watarumi; Yosuke Matsuo; Midori Kamei; Isao Kouno

Book ID
108282353
Publisher
Elsevier Science
Year
2003
Tongue
French
Weight
411 KB
Volume
59
Category
Article
ISSN
0040-4020

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Theadibenzotropolone , a new type pigmen
Theadibenzotropolone , a new type pigment from enzymatic oxidation of (−)-epicatechin and (−)-epigallocatechin gallate and characterized from black tea using LC/MS/MS
✍ Shengmin Sang; Shiying Tian; Xiaofeng Meng; Ruth E. Stark; Robert T. Rosen; Chun 📂 Article 📅 2002 🏛 Elsevier Science 🌐 French ⚖ 299 KB

Theaflavins and thearubigins are major pigments of black tea. In the course of studies on the oxidation mechanism of tea polyphenols, a new type of tea pigment, theadibenzotropolone A, together with theaflavin 3-gallate were formed by the reaction of (-)-epicatechin (EC) and (-)-epigallocatechin gal