Abstract
Lipid of biliverdin-lipoprotein in eel serum was fractionated into four fractions: Acetone-soluble, ether-soluble conjugated, ether-insoluble conjugated, and firmly combined lipid fractions. The acetone-soluble lipid fraction consisted of glycerides, free fatty acids, cholesterol esters, free cholesterol, with small amounts of alcohols and the other unsaponifiable matters. The main fatty acids in this fraction were 16:0 and 18:1 acids amounting to about 1/3 each of the total. Conjugated lipid fractions were composed of phosphatidylserine and a sort of phospholipid the nature of which remains to be clarified. The proportions of lipid fractions in the biliverdin-lipoprotein fluctuated considerably, while the composition of each fraction was relatively fixed and characteristic. Therefore, if the biliverdin-lipoprotein takes part in lipid transport in living eel, the mechanism might be different from that of the lipoprotein in higher animals.
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