Time resolved ESR study of the oxidation of the ascorbic Acid/Ascorbate system by the isopropylol radical in aqueous solution

Abstract

Abstraer. (CH3)~COH was generated photolytically in aqueous solution in the pH range 1.0 to 7.3 in presence of ascorbic acid. It reacts with ascorbate to yield the ascorbate radical anion. The kinefics of this oxidation and of the radical termination reactions were measured using time resolved ESR. It is shown that the ascorbate an5on reacts faster than the neutral molecule by a factor of 20. This is ascribed to differences in the free energies of reaction.