Kinetics of the reaction by which natural vitamin E is regenerated by vitamin C |
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Authors: | Nagaoka Shin-ichi Kakiuchi Takuhiro Ohara Keishi Mukai Kazuo |
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Affiliation: | Department of Chemistry, Faculty of Science, Ehime University, Matsuyama 790-8577, Japan. nagaoka@ehimegw.dpc.ehime-u.ac.jp |
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Abstract: | The rate constant and activation energy of the regeneration reaction of natural vitamin E by vitamin C were determined with a double-mixing stopped-flow spectrophotometer. The formation of vitamin C radical was observed in the absorption spectrum. The kinetic effect of methyl substitution on the aromatic ring of vitamin E radical indicates that partial charge-transfer plays a role in the reaction. Since a substantial deuterium kinetic isotope effect was not found, the tunneling effect may not play an important role under the present experimental conditions. |
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Keywords: | Vitamin E regeneration Vitamin C Reaction rate Activation energy Tocopherol Ascorbate |
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