Radicals generated in autoxidized methyl linoleate by light irradiation |
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Authors: | T Chiba K Fujimoto T Kaneda S Kubota Y Ikegami |
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Affiliation: | (1) Department of Food Chemistry, Faculty of Agriculture, Tohoku University, Sendai, Japan;(2) Chemical Research Instiute of Nonaqueous Solution, Tohoku University, Sendai, Japan |
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Abstract: | The structure of free radicals generated in the autoxidation of methyl linoleate (ML) was studied by the spin trapping technique
using deuterated nitrosodurene, (CD3)4C6HNO, as the spin trap. The secondary alkyl radicals were trapped after irradiation of ML with UV light. The formation rate
of secondary alkyl radicals increased upon shortening the wavelength of irradiation light and was closely correlated with
the peroxide value of autoxidized ML when a UV light longer than 250 nm was employed. When hydroperoxides separated from autoxidized
ML were added to ML, the relationship between the formation rate of secondary alkyl radicals and the amounts of added hydroperoxides
was nearly linear. These results suggest that secondary alkyl radicals are generated by proton abstraction of the active radicals,
such as RO and HO, which are produced by the photolysis of hydroperoxides with UV light. The spin trapping technique can be
applied to the study of lipid oxidation and/or photolysis of autoxidized lipid. |
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