Vitamin E — Vitamin C Synergestic Effect Towards Peroxyl Radicals: Influence of Dehydro-Ascorbic Acid
The Vitamin E — Vitamin C synergestic effect towards peroxyl radicals has been characterized by Υ radiolysis in ethanolic medium. Vit E — Vit C aerated solutions have been irradiated in the presence or in the absence of dehydro-ascorbic acid for ratios (Vit E)/(Vit C) between 1 and 27. The experimental results point out that the regeneration of Vit E from its oxidised radical by Vitamin C (k = 6 x 105mol−1.dm3.s−1) may be in competition with its consumption through the reaction of dehydro-ascorbic acid with the tocopheroxyl radical (k = 2 x 107mol−1.dm3.s−1).
KeywordsElectron Paramagnetic Resonance Peroxyl Radical Aerate Solution Differential Absorption Spectrum Differential Optical Density
Unable to display preview. Download preview PDF.
- 1.L.A.Wittig, Vitamin E and lipid antioxidants in free radical initiated reactions, in Free radicals in Biology, Pryor, W.A., ed, Academic Press, New York, 4: 295 (1980).Google Scholar
- 4.M.G.Simic, Vitamin E radicals, in Oxygen and Oxy-Radicals in chemistry and biology, Rodgers, M.A.J. and Powers E.L.,eds, Academic Press, New York, 109 (1981).Google Scholar
- 11.G.R.Freeman, Radiation Chemistry of Ethanol, Nat. Stand. Ref. Data Serv., Nat. Bur. Stand. (U.S.) 48 (NSRDS-NBS 48), (1974).Google Scholar
- 12.D.Jore, N.Kaouadji and C.Ferradini, The Vitamin E — Vitamin C synergestic effect studied by X radiolysis in ethanol, presented at International Conference on medical, biochemical and chemical aspects of free radicals, IVth biennal general meeting of the Society for free radical research, Kyoto, April 9 to 13,(1988), (proceeding in press).Google Scholar