title: Auto-oxidation products of astaxanthin.
abstract: The auto-oxidation products of astaxanthin were investigated. Astaxanthin was allowed to react with atmospheric oxygen at 55°C in the dark for 35 days. A series of oxidative cleavage products, 7-apoastaxanthinal (1), 9-apoastaxanthinone (2), 11-apoastaxanthinal (3), 13-apoastaxanthinone (4), 15-apoastaxanthinal (5), 14'-apoastaxanthinal (6), 12'-apoastaxanthinal (7), 10'-apoastaxanthinal (8), and 8'-apoastaxanthinal (9), were identified. Among them, 3 and 6 were isolated and characterized for the first time. Cleavage of the double bond in astaxanthin was discussed on the basis of the calculation of the stable molecular energy.
authors.affiliation: Graduate School of Science and Technology, Shizuoka University.
authors.forename: Hideo
authors.initials: H
authors.lastname: Etoh
authors.forename: Mika
authors.initials: M
authors.lastname: Suhara
authors.forename: Sinji
authors.initials: S
authors.lastname: Tokuyama
authors.forename: Hideaki
authors.initials: H
authors.lastname: Kato
authors.forename: Rie
authors.initials: R
authors.lastname: Nakahigashi
authors.forename: Yasunori
authors.initials: Y
authors.lastname: Maejima
authors.forename: Masaharu
authors.initials: M
authors.lastname: Ishikura
authors.forename: Yukimasa
authors.initials: Y
authors.lastname: Terada
authors.forename: Takashi
authors.initials: T
authors.lastname: Maoka
mesh_terms: D002627:Chemistry, Physical; D003624:Darkness; D010084:Oxidation-Reduction; D010100:Oxygen; D013696:Temperature; D013997:Time Factors; D024341:Xanthophylls / Q000737:chemistry / Q000302:isolation & purification*
chemical_list: C570993:7-apoastaxanthinal; C570994:9-apoastaxanthinone; D024341:Xanthophylls; C005948:astaxanthine; D010100:Oxygen