A new vitamin E (alpha-tocomonoenol) from eggs of the Pacific salmon Oncorhynchus keta |
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Authors: | Yamamoto Y Maita N Fujisawa A Takashima J Ishii Y Dunlap W C |
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Affiliation: | Research Center for Advanced Science and Technology, University of Tokyo, Japan. junkan@oxygen.rcast.u-tokyo.ac.jp |
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Abstract: | A novel alpha-tocomonoenol 3,4-dihydro-2,5,7,8-tetramethyl-2-(4,8,12-trimethyl-12-tridecenyl )-2H-1- benzopyran-6-ol[ having an unusual methylene unsaturation at the isoprenoid-chain terminus of alpha-tocopherol was isolated from the lipophilic fraction of chum salmon eggs. The structure of this marine-derived tocopherol (MDT) was established by spectral analyses. The peroxyl radical-trapping activities of MDT and alpha-tocopherol were compared in aqueous phosphatidylcholine liposomal suspension and in methanolic solution at 37 degrees C. The antioxidant activity of MDT was found to be identical to that of alpha-tocopherol under the experimental conditions of measurement. |
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