Phospholipid fatty acid composition of nine marine sponges from Qatar

Abstract

Phospholipid fatty acid composition was studied in sponge from Qatar including eight Demospongia and one Calcarea. More than 60 fatty acids were identified in each species as methyl esters and N-acyl pyrrolidides by gas chromatography-mass spectrometry. Twenty-two typical Delta-5,9 fatty acids were identified (C16 to C28), including two brominated acids. An unusual level (68%) of Delta-5,9 fatty acids was found in Dysidea sp. A new fatty acid was identified, namely 14-methyl-5,9-heptadecadienoic acid. Six unusual C18 and C20 acids were identified with the Delta-5,9, Delta-6,11 and Delta-7,13 unsaturations.