title: Sterols of marine microalgae Pyramimonas cf. cordata (Prasinophyta), Attheya ussurensis sp. nov. (Bacillariophyta) and a spring diatom bloom from Lake Baikal.
abstract: The free sterol compositions of two marine microalgal species Pyramimonas cf. cordata (Prasinophyta), Attheya ussurensis sp. nov. (Bacillariophyta), and diatom bloom samples from Lake Baikal were determined by gas chromatography, gas chromatography-mass spectrometry and (for some sterol constituents) using nuclear magnetic resonance spectra. A variety of sterol profiles were found. The principal sterol in the prasinophyte P. cf. cordata, collected in the Sea of Japan near Vladivostok, was 24(R)-ethylcholesta-5,22E-dien-3beta-ol (poriferasterol), but not 24-ethyl-5,24(28)Z-dien-3beta-ol, as reported earlier in the related species Pyramimonas cordata. The principal sterol in the marine diatom A. ussurensis sp. nov. was identified as 24-ethylcholest-5-en-3beta-ol. The sample of diatom bloom caused by Stephanodiscus meyerii with admixtures of several other diatom species, contained cholesterol and 24-methylcholesta-5,24(28)-dien-3beta-ol as main sterol constituents.
authors.affiliation: Pacific Institute of Bioorganic Chemistry of the Far East Branch of the Russian Academy of Sciences, Vladivostok-22, Prospect 100 let Vladivostoku, 159, 690022 Vladivostok, Russia.
authors.forename: L P
authors.initials: LP
authors.lastname: Ponomarenko
authors.forename: I V
authors.initials: IV
authors.lastname: Stonik
authors.forename: N A
authors.initials: NA
authors.lastname: Aizdaicher
authors.forename: T Yu
authors.initials: TY
authors.lastname: Orlova
authors.forename: G I
authors.initials: GI
authors.lastname: Popovskaya
authors.forename: G V
authors.initials: GV
authors.lastname: Pomazkina
authors.forename: V A
authors.initials: VA
authors.lastname: Stonik
mesh_terms: D000460:Chlorophyta / Q000737:chemistry*; D017377:Diatoms / Q000737:chemistry* / Q000254:growth & development*; D005618:Fresh Water; D013058:Mass Spectrometry; D015394:Molecular Structure; D012426:Russia; D012621:Seasons; D013261:Sterols / Q000032:analysis* / Q000737:chemistry
chemical_list: D013261:Sterols