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Journal of Lipid Research, Vol. 6, 100-105, January 1965
Copyright © 1965 by Lipid Research, Inc.

Composition of the diacyl glyceryl ethers and triglycerides of the flesh and liver of the dogfish (Squalus acanthias)

Donald C. Malins , John C. Wekell , and Clifford R. Houle

Bureau of Commercial Fisheries Technological Laboratory, U. S. Fish and Wildlife Service, Seattle, Washington

The major lipids of the dogfish (Squalus acanthias) are the diacyl glyceryl ethers and triglycerides. These classes of compounds in the flesh (dorsal section) and liver were separated by thin-layer chromatography. The glyceryl ethers and/or fatty acids resulting from saponification of each of these fractions were analyzed by gas-liquid chromatography as their isopropylidene and methyl ester derivatives, respectively.

Few significant differences were apparent between the ether portions of the diacyl glyceryl ethers of the flesh and liver, but the fatty acids were quite different in composition. Those of the flesh contained high percentages of the C₂₀ and C₂₂ polyenoic acids that are characteristic of most fish lipids; those of the liver contained little polyenoic acid but high concentrations of C₂₀ and C₂₂ monoenoic acids. Although the triglycerides of the flesh contained more of the polyenoic acids than the liver, the differences in this fraction between the flesh and liver were less striking. It appears that the over-all unsaturation of the dogfish lipids is largely governed by the relative amounts of monoenoic and polyenoic acids in the C₂₀ and C₂₂ series.

Supplementary key words diacyl glyceryl ethers • fatty acids • triglycerides • dogfish (Squalus acanthias) • flesh of dogfish • liver of dogfish • acetonation of glyceryl ethers • thin-layer chromatography • gas-liquid chromatography

Submitted on March 17, 1964
Accepted on August 3, 1964

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				D. C. Malins and A. Barone Glyceryl Ether Metabolism: Regulation of Buoyancy in Dogfish Squalus acanthias Science, January 2, 1970; 167(3914): 79 - 80. [Abstract] [PDF]