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Comparative studies on the ether-linked lipids of ratfish and sharks-VI. Compositions of ether-linked lipids in livers of two species of ratfish.

1983; Springer Science+Business Media; Volume: 49; Issue: 5 Linguagem: Inglês

10.2331/suisan.49.777

1349-998X

Kenji Hayashi, Tôru Takagi, Masahiko Kitagawa,

Cholesterol and Lipid Metabolism

The compositions of diacyl glyceryl ethers and neutral plasmalongens of the liver lipids of male and female specimens of two species of deep-sea ratfish Hydrolagus barbouri and Rhinochimaera pacifica were investigated. The livers of the examined ratfish yielded high lipid contents (75.9%-82.9%). Neutral lipids were the perdominant classes, accounting for more than 98% of the total lipid contents. The livers of these fish contained, in addition to 22.8%-31.7% triglycerides, ether-linked lipids of 53.5%-63.4% diacyl glyceryl ethers and 1.0%-6.7% neutral plasmalogens. In both species, the component alkyl glyceryl ethers of diacyl glyceryl ethers were found to consist mostly of monoenes (76.2%-81.1%) and saturates (15.5%-19.6%) of 14-24 carbon atoms for the alkyl moiety. The principal components found were: 18:1 (43.7%-57.5%), 16:1 (6.8%-13.5%), 20:1 (5.7%-8.7%), and 16:0 (5.4%-7.8%). The component aldehydes obtained from alk-l-enyl glyceryl ethers of neutral plasmalogens were mostly composed of monoenes (63.8%-81.8%) and saturates (18.8%-34.0%) of 14-24 carbon atoms. The major constituents were: 20:1 (40.3%-55.2%), 18:1 (5.4%-25-8%), 18:0 (5.7%-18.1%), and 16:0 (5.3%-8.0%). The component fatty acids of diacyl glyceryl ethers and neutral plasmalogens were roughly similar in composition to those of triglycerides. Monoenes having 18:1, 20:1, and 22:1 acids as the predominant components were found.