Studies on the Mechanism of the Oxidation of Tea Leaf Catechins
- 1 August 1963
- journal article
- research article
- Published by Oxford University Press (OUP) in Agricultural and Biological Chemistry
- Vol. 27 (8) , 562-568
- https://doi.org/10.1080/00021369.1963.10858146
Abstract
In order to understand the mechanism of the enzymic oxidation of epigallocatechin, ethyl gallate was taken up as a model substrate on account of its close structural similarity to the w-trihydroxyphenyl group, which indeed is supposed to be attacked by oxidase, when epigallocatechin is oxidized enzymically. By the action of tea or apple oxidase at pH 5.5, it gave a characteristic polyphenolic substance, which was obtained in prisms, C18H18O10·2H2O, and proved to be diethyl 4,4′,5,5′,6,6′-hexahydroxydiphenate, as the product was converted into ellagic acid by hydrolysis of ester linkage and then lactone formation.This publication has 1 reference indexed in Scilit:
- Oak-bark tanninsBiochemical Journal, 1958