title: New C37 skeletal carotenoid from the clam, Paphia amabillis.
abstract: Carotenoids in the muscle of Paphia amabillis (Veneridae) were investigated. Amarouciaxanthin 3-ester (1a) was found to be a major carotenoid along with amarouciaxanthin A (1b), fucoxanthinol 3-ester (2), peridininol 3'-ester (3), and a new C(37) skeletal carotenoid, named hydratopyrrhoxanthinol 3'-ester. This structure was determined to be 3'-acyloxy-3,5,6-trihydroxy-7',8'-didehydro-5,6-dihydro-12',13',20'-trinor-beta,beta-caroten-19,11-olide (4) by UV-vis, NMR, and FAB-MS spectral data. The absolute configuration of 4 was postulated to be (3S,5R,6R,3'R) on the bases of CD and ROESY data. The fatty acids esterified with hydratopyrrhoxanthinol were assigned as C22:6, C20:1, C20:4, C20:5, C18:0, C18:1, C17:0, C16:0, C16:1, and C14:0 on the basis of FAB-MS data.
authors.affiliation: Research Institute for Production Development, 15 Shimogamo-morimoto-cho, Sakyo-ku, Kyoto 606-0805, Japan. maoka@mbox.kyoto-inet.or.jp
authors.forename: Takashi
authors.initials: T
authors.lastname: Maoka
authors.forename: Naoshige
authors.initials: N
authors.lastname: Akimoto
authors.forename: Mi-Jin
authors.initials: MJ
authors.lastname: Yim
authors.forename: Masashi
authors.initials: M
authors.lastname: Hosokawa
authors.forename: Kazuo
authors.initials: K
authors.lastname: Miyashita
mesh_terms: D000818:Animals; D002338:Carotenoids / Q000737:chemistry* / Q000302:isolation & purification; D004952:Esters / Q000737:chemistry / Q000302:isolation & purification; D009132:Muscles / Q000737:chemistry; D012758:Shellfish / Q000032:analysis*
chemical_list: D004952:Esters; D002338:Carotenoids