title: Carotenoids in clams, Ruditapes philippinarum and Meretrix petechialis.
abstract: Carotenoids were investigated in two species of clams, Rudiapes philippinarum and Meretrix petechialis. Fucoxanthin 3-esters and fucoxanthinol 3-esters were found to be major components, along with crassostreaxanthin A 3-acetate, crassostreaxanthin A, crassostreaxanthin B 3-acetate, crassostreaxanthin B, halocynthiaxanthin 3'-acetate, halocynthiaxanthin, alloxanthin, diatoxanthin, diadinoxanthin, and heteroxanthin. Fatty acids esterified with fucoxanthin and fucoxanthinol were identified as C24:6, C22:5, C22:6, C20:5, C20:0, C20:1, C18:0, C18:1, C16:0, C16:1, and C14:0 from fast atom bombardment-mass spectrometry (FAB-MS) data. Crassostreaxanthin A 3-acetate and crassostreaxanthin B 3-acetate were first isolated and completely characterized by spectroscopic data. Furthermore, possible metabolic pathways of fucoxanthin in clams were proposed.
authors.affiliation: Research Institute for Production Development, Sakyo-ku, Kyoto, 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: Michiaki
authors.initials: M
authors.lastname: Murakoshi
authors.forename: Keikichi
authors.initials: K
authors.lastname: Sugiyama
authors.forename: Hoyoku
authors.initials: H
authors.lastname: Nishino
mesh_terms: D000818:Animals; D049872:Bivalvia / Q000737:chemistry* / Q000145:classification; D002338:Carotenoids / Q000032:analysis*; D009682:Magnetic Resonance Spectroscopy; D013045:Species Specificity; D016339:Spectrometry, Mass, Fast Atom Bombardment; D013056:Spectrophotometry, Ultraviolet
chemical_list: D002338:Carotenoids