Abstract
The well resolved electron spin resonance (ESR) of the tocopheroxyl and chromanoxyl radicals derived from α-, β-, γ- and δ-tocopherols (vitamin E), 5,7-dimethyltocol, tocol and their model compounds in degassed toluene by treatment with 2,2-diphenyl-1-picrylhydrazyl were recorded. Their hyperfine coupling constants were determined and assigned using spectrum simulation. Their g-factors were also measured. On the basis of these parameters, the α-tocopheroxyl radical is similar to the 2,2,5,7,8-pentamethylchroman-6-oxyl, 5,7-dimethyltocoxyl and 2,2,5,7-tetramethylchroman-6-oxyl radicals. This suggests that the presence of methyl groups at C-5 and C-7 in tocopherols and chroman-6-ols is of great importance to their antioxidant action. The ESR parameters obtained here are very useful for the identification and quantification of a variety of tocopheroxyl radicals.
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Abbreviations
- ESR:
-
electron spin resonance
- DPPH:
-
2,2-diphenyl-1-picrylhydrazyl
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TMIG-I No. 43
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Matsuo, M., Matsumoto, S. Electron spin resonance spectra of the chromanoxyl radicals derived from tocopherols (vitamin E) and their related compounds. Lipids 18, 81–86 (1983). https://doi.org/10.1007/BF02534695
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DOI: https://doi.org/10.1007/BF02534695