Autooxidation of Some Polyphenols in Various Copper(II) Solutions

  • Lim Y. Y.


The rates of autooxidation of naturally occurring polyphenols, viz., gallic acid, catechin and epicatechin in various aqueous copper(II) solutions – surface active and non surface active types, were measured at 25OC under a variety of experimental  conditions. Compared to gallic acid and the simpler alkyl-substituted diols, such as 4-methylcatechol, and 3,5-di-tert-butylcatechol, catechin and epicatechin were found to be relatively inert towards autooxidation. The relative stability of catechins  may be related to their tricyclic C6-C3-C6 flavan skeleton in a manner not well understood at the moment.