プランクトン脂質の研究-II : 南氷洋および北洋Euphausiacea油脂の脂肪酸成分

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The lipids of krills, Euphausia superba from the Antarctic Ocean and Euphausiacea (Euphausia pacifica with a little amount of Thysanoessa inermis and Thysanoessa longites) from the Northern Pacific Ocean, were examined. The specimens obtained from the stomach of fin whales in good condition, were extracted with alcohol, acetone and ether, and reddish brown lipids were obtained. The lipid of the former specimen contains less amount of unsaponifiable matter than that of the latter (Table 1). The fatty acids of the former are composed of 28.2% saturated acids (palmitic 14.4%, myristic 11.9% and the trace of stearic and lauric) and 71.8% unsaturated acids (C18 34.7%, C16 18.6%, >C20 13.6%, C14 4.5% and the trace of C12), whereas the latter are composed of 16.1% saturated acids (palmitic 13.8% and the trace of stearic and myristic) and 83.9% unsaturated acids (C18 52.8%, >C20 15.5%, C10 8.6% and C14 7.0%). The difference of fatty acid composition between Euphausiacea gathered in the Antarctic and the Northern Pacific Oceans resembles that observed between fin-whale blubber oils from the both oceans5).
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