title: A new dihydroxysterol from the marine phytoplankton Diacronema sp.
abstract: Diacronema sp. was cultured and its sterols were separated by column chromatography on silica gel. The new sterol 24-ethyl-4alpha-methyl-cholestane-3,20-diol (1) was characterised by NMR and MS spectrometry, as well as (22E)-24-ethyl-4alpha-methyl-5alpha-cholest-22-en-3beta-ol (2) and beta-sitosterol, the major components of the sterol fractions. Neither the biosynthetic origin of the new dihydroxysterol nor its role in the biochemistry of Diacronema is known.
authors.affiliation: Departamento de Química e Bioquímica, Faculdade de Ciências da Universidade de Lisboa, Campo Grande, Ed. C8, 5 piso, 1749-016 Lisboa, Portugal. aprauter@fc.ul.pt
authors.forename: Amélia P
authors.initials: AP
authors.lastname: Rauter
authors.forename: Manuela M
authors.initials: MM
authors.lastname: Filipe
authors.forename: Carla
authors.initials: C
authors.lastname: Prata
authors.forename: João P
authors.initials: JP
authors.lastname: Noronha
authors.forename: Maria A M
authors.initials: MA
authors.lastname: Sampayo
authors.forename: Jorge
authors.initials: J
authors.lastname: Justino
authors.forename: Jaime
authors.initials: J
authors.lastname: Bermejo
mesh_terms: D000818:Animals; D044523:Chrysophyta; D009682:Magnetic Resonance Spectroscopy; D013058:Mass Spectrometry; D008517:Phytotherapy; D013261:Sterols / Q000737:chemistry*
chemical_list: D013261:Sterols