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首页> 外文期刊>Journal of Agricultural and Food Chemistry >Regeneration of beta-Carotene from Radical Cation by Eugenol, Isoeugenol, and Clove Oil in the Marcus Theory Inverted Region for Electron Transfer
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Regeneration of beta-Carotene from Radical Cation by Eugenol, Isoeugenol, and Clove Oil in the Marcus Theory Inverted Region for Electron Transfer

机译：Regeneration of beta-Carotene from Radical Cation by Eugenol, Isoeugenol, and Clove Oil in the Marcus Theory Inverted Region for Electron Transfer

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The rate of regeneration of beta-carotene by eugenol from the beta-carotene radical cation, an initial bleaching product of beta-carotene, was found by laser flash photolysis and transient absorption spectroscopy to be close to the diffusion limit in chloroform/methanol (9:1, v/v), with a second-order rate constant (k(2)) of 4.3 x 10(9) L mol(-1) s(-1) at 23 degrees C. Isoeugenol, more reducing with a standard reduction potential of 100 mV lower than eugenol, was slower, with k(2) = 7.2 x 10(8) L mol(-1) s(-1). Regeneration of beta-carotene following photobleaching was found 50 more efficient by eugenol, indicating that, for the more reducing isoeugenol, the driving force exceeds the reorganization energy for electron transfer significantly in the Marcus theory inverted region. For eugenol/isoeugenol mixtures and clove oil, kinetic control by the faster eugenol determines the regeneration, with a thermodynamic backup of reduction equivalent through eugenol regeneration by the more reducing isoeugenol for the mixture. Clove oil, accordingly, is a potential protector of provitamin A for use in red palm oils.

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