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- W1969738045 abstract "Time-resolved electron spin resonance (ESR) spectroscopy for the study of radicals produced by pulse radiolysis is illustrated by a study of the oxidation of ascorbic acid by OH radical in aqueous solution. In basic solution, the direct oxidation product, the ascorbate mono-anion radical, is formed within less than 2 mus of the radiolysis pulse. In acid solutions (pH 3(-4.5), N(2)O:saturated) three radicals are initially formed, the ascorbate mono-anion radical, an OH adduct seen also in steady-state ESR experiments, and an OH adduct at C2 with the main spin density at C3 of the ring. The first OH adduct decays with an initial half-life of about 100 mus, probably by biomolecular reaction. The second OH adduct, which shows one hyperfine splitting about a(H) = 24.4 +/- 0.3 G and g = 2.0031 +/- 0.0002, decays with a half-life of about 10 mus. On this same time scale the concentration of the ascorbate radical approximately doubles. It is concluded that the adduct at C2, but not the other adduct, loses water rapidly to form the ascorbate radical." @default.
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- W1969738045 date "1978-10-01" @default.
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- W1969738045 title "A time-resolved electron spin resonance study of the oxidation of ascorbic acid by hydroxyl radical" @default.
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- W1969738045 doi "https://doi.org/10.1016/s0006-3495(78)85349-1" @default.
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