EFFECT OF ADDITIVES ON FREE-RADICAL FORMATION IN AQUEOUS-SOLUTIONS OF ASCORBIC-ACID

  • 1 January 1977
    • journal article
    • research article
    • Vol. 47  (3) , 258-264
Abstract
The relative rate constants for decay of ascorbate free radical in aqueous solutions in the presence of heavy metal ions, H2O2 and sulfite were measured by ESR-spectroscopy. Oxidation of ascorbic acid showed a strong pH dependence, reaching a maximum rate at pH 9.6. Ascorbic acid radical decay apparently generally follows overall 2nd order kinetics, being 1st order in the presence of H2O2. The protective effect of SO2 is proposed to have nutritional implications.

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