title: Identification of the new 18-hexacosenoic acid in the sponge Thalysias juniperina.
abstract: The phospholipid fatty acids from the sponge Spheciospongia cuspidifera were studied revealing the presence of the rare 10-octadecenoic acid (10-18:1) and a new 2-methoxyhexadecenoic acid. The phospholipid fatty acids from Thalysias juniperina were also studied revealing the presence of the hitherto unreported 18-hexacosenoic acid (18-26:1). These results tend to indicate that the biosynthetic pathway from 10-18:1 to 18-26:1 may be operative in nature. The phospholipid mixture from the sponges was also analyzed by 31P-NMR and shown to mainly consist of phosphatidylethanolamine, phosphatidylserine, phosphatidylinositol, and phosphatidylglycerol. Phosphatidylcholine was not found in the sponges analyzed in this work.
authors.affiliation: Department of Chemistry, University of Puerto Rico, Rio Piedras 00931.
authors.forename: N M
authors.initials: NM
authors.lastname: Carballeira
authors.forename: F
authors.initials: F
authors.lastname: Shalabi
authors.forename: M E
authors.initials: ME
authors.lastname: Maldonado
mesh_terms: D000818:Animals; D005227:Fatty Acids / Q000302:isolation & purification; D005229:Fatty Acids, Monounsaturated / Q000302:isolation & purification*; D009682:Magnetic Resonance Spectroscopy; D009829:Oleic Acids / Q000302:isolation & purification; D010169:Palmitic Acids / Q000302:isolation & purification; D010743:Phospholipids / Q000302:isolation & purification; D011161:Porifera / Q000032:analysis*
chemical_list: D005227:Fatty Acids; D005229:Fatty Acids, Monounsaturated; D009829:Oleic Acids; D010169:Palmitic Acids; D010743:Phospholipids; C064301:18-hexacosenoic acid; C046568:10-octadecenoic acid