title: Comparative study of the fatty acid composition of sponges of the genus Ircinia. Identification of the new 23-methyl-5,9-tetracosadienoic acid.
abstract: 1. The phospholipid fatty acid compositions of the sponges Ircinia strobilina, Ircinia felix, Ircinia campana, Ircinia sp., Spongia tubulifera and Dysidea etherea were studied, revealing the presence, besides other common fatty acids, of considerable amounts (2-5%) of the novel 23-methyl-5,9-tetracosadienoic acid (1). 2. The demospongic acids 5,9-tetracosadienoic acid, 23-methyl-5,9-tetracosadienoic acid (1), and 5,9-pentacosadienoic acid, were particularly abundant in sponges of the genus Ircinia, in contrast to the most common 5,9-hexacosadienoic acid found in other species. These findings are discussed in terms of the taxonomy of the Dictyoceratida. 3. The complete characterization of the novel phospholipid fatty acid 23-methyl-5,9-tetracosadienoic acid (1) is presented.
authors.affiliation: Department of Chemistry, University of Puerto Rico, Rio Piedras.
authors.forename: N M
authors.initials: NM
authors.lastname: Carballeira
authors.forename: F
authors.initials: F
authors.lastname: Shalabi
authors.forename: C
authors.initials: C
authors.lastname: Cruz
authors.forename: J
authors.initials: J
authors.lastname: Rodriguez
authors.forename: E
authors.initials: E
authors.lastname: Rodriguez
mesh_terms: D000818:Animals; D005227:Fatty Acids / Q000032:analysis*; D005231:Fatty Acids, Unsaturated / Q000032:analysis*; D010743:Phospholipids / Q000032:analysis*; D011161:Porifera / Q000737:chemistry*
chemical_list: D005227:Fatty Acids; D005231:Fatty Acids, Unsaturated; D010743:Phospholipids; C074583:23-methyl-5,9-tetracosadienoic acid