Structures of epicatechin gallate trimer and tetramer produced by enzymatic oxidation.

@article{Kusano2007StructuresOE,
  title={Structures of epicatechin gallate trimer and tetramer produced by enzymatic oxidation.},
  author={Rie Kusano and Takashi Tanaka and Yosuke Matsuo and Isao Kouno},
  journal={Chemical & pharmaceutical bulletin},
  year={2007},
  volume={55 12},
  pages={1768-72}
}
During black tea production, catechins and their galloyl esters are enzymatically oxidized to generate a complex mixture of black tea polyphenols. The role of galloyl ester groups in this process has yet to be determined. Enzymatic oxidation of epicatechin 3-O-gallate (1) yielded two new oxidation products, theaflavate C and bistheaflavate A, along with theaflavate A (2), a known dimer of 1 generated by coupling of the B-ring with the galloyl group. Theaflavate C is a trimer of 1 and possesses… CONTINUE READING

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