title: Studies on chemical constituents of Gracilaria verrucosa.
abstract: A new sterol glucoside, (24R)-5 alpha-stigmast-9-(11)-en-3beta-D-glucopyranoside (1) has been isolated from a methanol extract of the red alga Gracilaria verrucosa, while cholesterol and (Z)-9-hexadecenoic acid (palmitoleic acid) have been isolated from a dichloromethane-acetone extract of the same alga. Additionally, an oily fraction of a dichloromethane-acetone extract has been investigated by gas chromatography/mass spectrometry (GC/MS). The main components in the oily fraction were heneicosanoic acid (49.8%), (Z)-9-octadecenoic acid (15.8%), and 15-tetracosenoic acid (15.6%) in addition to a few hydrocarbons, simple aromatics and a new compound, namely 3,4-dimethyl-5-carboxyclic acid-1-oxacyclopent-3-en-2-one. The structures of the isolated compounds have been elucidated by spectroscopic methods.
authors.affiliation: Faculty of Pharmacy, Department of Analytical Chemistry, Istanbul University, Beyazit, Istanbul, Turkey. aydogmus@istanbul.edu.tr
authors.forename: Zeynep
authors.initials: Z
authors.lastname: Aydoğmuş
authors.forename: Gülaçti
authors.initials: G
authors.lastname: Topcu
authors.forename: Kasim Cemal
authors.initials: KC
authors.lastname: Güven
mesh_terms: D015107:4-Butyrolactone / Q000031:analogs & derivatives; D005227:Fatty Acids / Q000737:chemistry / Q000302:isolation & purification; D005229:Fatty Acids, Monounsaturated / Q000737:chemistry / Q000302:isolation & purification; D008401:Gas Chromatography-Mass Spectrometry; D005960:Glucosides; D044724:Gracilaria / Q000737:chemistry*; D015394:Molecular Structure; D019906:Nuclear Magnetic Resonance, Biomolecular; D013237:Stereoisomerism; D013265:Stigmasterol / Q000031:analogs & derivatives
chemical_list: C534264:(24R)-5-stigmast-9-(11)-en-3beta-D-glucopyranoside; C534265:3,4-dimethyl-5-carboxyclic acid-1-oxacyclopent-3-en-2-one; D005227:Fatty Acids; D005229:Fatty Acids, Monounsaturated; D005960:Glucosides; C008757:palmitoleic acid; D013265:Stigmasterol; D015107:4-Butyrolactone