General PapersPhospholipid Fatty Acid Composition of Gorgonians of the Genus Eunicea: Further Identification of Tetracosapolyenoic Acids

Add time:09/08/2019    Source:sciencedirect.com

The phospholipid fatty acid composition of the Caribbean gorgonian corals Eunicea fusca (Duchassaing and Michelotti), Eunicea laciniata (Duchassaing and Michelotti), Eunicea mammosa (Lamouroux), Eunicea succinea (Pallas), and Eunicea sp. is described for the first time. The main phospholipids identified were phosphatidylethanolamine, phosphatidylcholine, and phosphatidylserine. All five gorgonians presented a similar phospholipid fatty acid composition. The main fatty acids were 16:0, 18:3 (n − 6), 18:4 (n − 3), 20:4 (n − 6), 22:6 (n − 3), 24:5 (n − 6), and 24:6 (n − 3). In all of the studied Eunicea gorgonians, the tetracosapolyenoic fatty acids 24:5 (n − 6) and 24:6 (n − 3), as well as the (Z) and (E) isomers of 7-methyl-6-hexadecenoic acid, were identified. On the other hand, E. fusca and E. laciniata contained, in trace amounts, the unusual 19:4 (n − 3) acid, while E. succinea contained the recently reported 14-methyl-5,9-pentadecadienoic acid. In all of the five studied gorgonians n − 6 polyunsaturated fatty acids predominated. These findings expand the occurrence of tetracosapolyenoic fatty acids to the Eunicea.

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