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Oxidation mechanism of black tea pigment theaflavin by peroxidase


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Title: Oxidation mechanism of black tea pigment theaflavin by peroxidase
Authors: Kusano, Rie / Matsuo, Yosuke / Saito, Yoshinori / Tanaka, Takashi
Issue Date: 2-Sep-2015
Publisher: Elsevier Limited
Citation: Tetrahedron Letters, 56(36), pp.5099-5102; 2015
Abstract: A large number of black tea polyphenols remain uncharacterized because of the complexity of catechin oxidation reactions that occur during tea fermentation. In the course of our studies on black tea polyphenols, we examined the enzymatic degradation of theaflavins, which are black tea pigments having a benzotropolone chromophore. Oxidation of theaflavin with peroxidase afforded a new product named theacoumarin A together with known pigment theanaphthoquinone. The structure of the new compound was determined by spectroscopic examination and a production mechanism via theanaphthoquinone is proposed.
Keywords: Black tea / Peroxidase / Theacoumarin A / Theaflavin / Theanaphthoquinone
URI: http://hdl.handle.net/10069/35782
ISSN: 00404039
DOI: 10.1016/j.tetlet.2015.07.037
Rights: © 2015 Elsevier Ltd. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/
Type: Journal Article
Text Version: author
Appears in Collections:Articles in academic journal

Citable URI : http://hdl.handle.net/10069/35782

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