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• W2136445675 abstract "Photobleached β-carotene (Car) is regenerated in hexane on a microsecond timescale in the presence of α-tocopherol (TOH) but not when α-tocopherol is absent, as studied by laser flash photolysis. β-Carotene radical cations (Car+) likewise react with (excess) α-tocopherol: Car+ TOH→ Car + TO· + H+ (second-order rate constant of k = 1.7 ± 0.1 · 107 M-1 s-1 in homogeneous di-tert-butylperoxide/ benzene at 20°C) rather than α-tocopheroxyl radicals (TO·) reacting with β-carotene. In hexane, hexane radicals formed by pulse radiolysis react considerably faster with β-carotene (k = 2.1 ± 0.1 · 109 M-1 s-1) than with α-tocopherol (k = 4.9 ± 0.1 · 106 M-1 s-1). No evidence was obtained for a slower rate of β-carotene radical cation formation in β-carotene/α-tocopherol mixtures resulting from α-tocopheroxyl radical oxidation of β-carotene. Steady-state radiolysis experiments confirmed that α-tocopherol protects β-carotene from oxidation by hexane radicals. In both solvent systems, β-carotene is regenerated from the radical cation by α-tocopherol rather than α-tocopherol being regenerated by β-carotene from the α-tocopheroxyl radical." @default.
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• W2136445675 date "1998-01-01" @default.
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• W2136445675 title "Re-appraisal of the Tocopheroxyl Radical Reaction with β-Carotene: Evidence for Oxidation of Vitamin E by the β-Carotene Radical Cation" @default.
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• W2136445675 doi "https://doi.org/10.3109/10715769809097877" @default.
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