NEW PHOSPHOLIPID FATTY-ACIDS FROM THE MARINE SPONGE CINACHYRELLA-ALLOCLADA ULICZKA

The fatty acid composition of phospholipids from the Senegalese sponge Cinachyrella alloclada was examined. Two new fatty acids not hitherto found in nature, namely 10,13-octadecadienoic acid and 16-tricosenoic acid, were identified. 8-Hexadecenoic, 13-nonadecenoic and 5,9,13-trimethyltetradecanoic fatty acids were also found for the first time in sponges. The latter compound (1.4% of the total fatty acid mixture), an isoprenoid fatty acid, accompanies the major fatty acid, 4,8,12-trimethyltridecanoic acid (19.7%). The monomethyl branched fatty acids (22%) identified include 23-methylpentacosanoic acid (anteiso-26:0), not previously observed in sponges. The major long-chain fatty acids encountered were the known 17-tetracosenoic, 19-hexacosenoic, 25-methyl-5,9-hexacosadienoic, 26-methyl-5,9-heptacosadienoic and 5,9,23-tricontatrienoic acids. Some sixty fatty acids were identified as methyl esters and N-acyl pyrrolidides by gas chromatography and gas chromatography/mass spectrometry.