The holothurian Eupentacta fraudatrix is widely used for studying how regeneration works and as a source of biological active compounds. Data on the lipid content and composition of E. fraudatrix are limited to the description of fatty acid (FA) composition. The storage and structural lipids of E. fraudatrix gut have been analyzed by different chromatographic and mass spectrometry methods. Triacylglycerols, as storage lipids, are characterized by a high concentration of trophic FA markers. Among structural lipids, phosphatidylethanolamines and phosphatidylcholines contain a high concentration of molecular species with a simple ether linkage. Phosphatidylserines (PS) and phosphatidylinositols (PI) differ from other lipids with very-long-chain FA in composition. The FA 23:1n-9, which is characteristic of holothurians, has been detected in PS and PI. The study of marine organisms' lipidome may contribute to understanding the biosynthetic pathways and distribution of trophic markers in lipids.
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