title: A new vitamin E (alpha-tocomonoenol) from eggs of the Pacific salmon Oncorhynchus keta.
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.
authors.affiliation: Research Center for Advanced Science and Technology, University of Tokyo, Japan. junkan@oxygen.rcast.u-tokyo.ac.jp
authors.forename: Y
authors.initials: Y
authors.lastname: Yamamoto
authors.forename: N
authors.initials: N
authors.lastname: Maita
authors.forename: A
authors.initials: A
authors.lastname: Fujisawa
authors.forename: J
authors.initials: J
authors.lastname: Takashima
authors.forename: Y
authors.initials: Y
authors.lastname: Ishii
authors.forename: W C
authors.initials: WC
authors.lastname: Dunlap
mesh_terms: D000818:Animals; D002851:Chromatography, High Pressure Liquid; D005260:Female; D009682:Magnetic Resonance Spectroscopy; D017685:Oncorhynchus keta / Q000378:metabolism*; D010063:Ovum / Q000737:chemistry*; D014810:Vitamin E / Q000031:analogs & derivatives* / Q000302:isolation & purification
chemical_list: C404388:alpha-tocomonoenol; D014810:Vitamin E