Lipid Metabolism in Helminth Parasites. I. The Lipids of Hymenolepis diminuta (Cestoda)

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Abstract
Lipids of H. diminuta adults were analyzed by means of thin layer, column, and gas-liquid chromatography. Total lipids comprised 5.8% of the fresh weight, and consisted of neutral and polar lipids in a 3:1 ratio. Triglycerides comprised most of the neutral lipids, but free fatty acids, monoglycerides, and 1,2- and 1,3 diglycerides were also present. Cholesterol was the only sterol found, and little of it was esterified. Phospholipids were most successfully fractionated on DEAE cellulose columns. Phosphatldyl chollne, phosphatidyl ethanolamine, phosphatidyl serine, plasmalogens, lysophospho-lipids, cardiolipids or phosphatidic acid, and inositides were all present, as were cerebrosides. Sphingomycin was not identified, and if present is a minor component. The fatty acids of most of the tissue lipids were quantitatively identified. In general, the fatty acids present in individual phospho- and glycolipids were characteristic, and corresponded, with some quantitative exceptions, with those found in other animals including polyunsaturated and high molecular weight acids and the C24 acids of cerebrosides. Fatty acids of the glycer ides were mainly unsaturated, and differed from those of most animals in that linoleic was much more abundant than oleie. Free fatty acids differed quantitatively from those of any other lipid except cholesterol esters.

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