Catechin enzymatic hydrolysis

Catechin-(4a-6)-(+)-catechin (B6) Seeds Ricardo da SUva et al. (1991c) HPLC, TLC, - H NMR, FAB-MS after enzymatic hydrolysis, acid hydrolysis, partial acid-catalysed degradation with phloroglucinol or phenylmethanethiol... 

Finally, Weinges et al. (31, 33) postulated the formation of dimers such as 27 or 28, 29 or 30 directly from catechins without involving 3,4-flavandiols (leucoanthocyanidins). This process has never been demonstrated in fruits directly and specifically not in grapes. Only the proanthocyanin dimers have been positively identified through the formation of catechins and anthocyanidins during acid hydrolysis. Dimer formation proceeds by enzymatic oxidation of two molecules of catechin... 

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