caa a22 4500 465765890 CHVBK 20180323111913.0 cr unu---uuuuu 170327e19901201xx s 000 0 eng 10.1007/BF02535906 doi (NATIONALLICENCE)springer-10.1007/BF02535906 Identification of naturally occurring trans, trans Δ5,9 fatty acids from the sponge Plakortis halichondroides [Elektronische Daten] [Néstor Carballeira, Fathi Shalabi] The firsttrans fatty acids from a sponge have been isolated fromPlakortis halichondroides. The sponge was shown to contain theiso acids (5E,9E)-19-methyl-5,9-eicosadienoic, (5E,9E)-20-methyl-5,9-heneicosadienoic and (5E,9E)-21-methyl-5,9-docosadienoic acid, as well as theanteiso acids (5E,9E)-19-methyl-5,9-heneicosadienoic and (5E,9E)-20-methyl-5,9-docosadienoic acid together with the straight chain (5E,9E)-5,9-docosadienoic acid. The acids were shown by gas chromatography, Fourier transform infrared and13C nuclear magnetic resonance to contain thetrans configuration. An eicosadienoic acid, namely (6E,14E)-6,14-eicosadienoic acid, and 12-methyl-5-octadecenoic acid were also identified in a sponge for the first time. The fatty acids were shown to be the principal constituents of phosphatidylethanolamine and phosphatidylcholine. No sterols were found in the sponge. The results presented in this work should be helpful in taxonomy of Homoscleromorpha. American Oil Chemists' Society, 1990 Carballeira Néstor Department of Chemistry, University of Puerto Rico, 00931, Rio Piedras, Puerto Rico aut Shalabi Fathi Department of Chemistry, University of Puerto Rico, 00931, Rio Piedras, Puerto Rico aut Lipids Springer-Verlag 25/12(1990-12-01), 835-840 0024-4201 25:12<835 1990 25 11745 https://doi.org/10.1007/BF02535906 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF02535906 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Carballeira Néstor Department of Chemistry, University of Puerto Rico, 00931, Rio Piedras, Puerto Rico aut NATIONALLICENCE 700 1- Shalabi Fathi Department of Chemistry, University of Puerto Rico, 00931, Rio Piedras, Puerto Rico aut NATIONALLICENCE 773 0- Lipids Springer-Verlag 25/12(1990-12-01), 835-840 0024-4201 25:12<835 1990 25 11745 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer