1985 年 34 巻 4 号 p. 262-270
The monthly change of the fatty acid composition of lipids in the ascidian, Halocynthia roretzi was examined by GLC, before and after their fractionation into polar and nonpolar lipids. Lipids were extracted monthly from the edible parts and viscera of ascidian from April to March, and from the genital glands of ascidian from November to January.
The lipid content in ascidian increased from September and decreased from January. The content in the genital glands was higher than in the edible parts and viscera.
In ascidian lipids, polyunsaturated fatty acid (20 : 5 and 22 : 6) showed high value. The content of heptadecanoic acid was higher in lipids from the liver and genital glands than that of edible parts. The polar lipids contained much heptadecanoic acid while the neutral lipids, very little.
The fatty acid composition of phosphatidyl choline and phosphatidyl ethanolamine, the main phospholipids, were, mainly composed of unsaturated acids, with polyunsaturated acid (20 : 5, 22 : 6) predominant.
The compositional percentages of fatty acids somewhat fluctuated, but the variation according to season was not clear.