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Journal of Lipid Research, Vol. 5, 225-231, April 1964
Copyright © 1964 by Lipid Research, Inc.

The lipid composition of human plasma chylomicrons

Peter Wood , Kunitaro Imaichi , John Knowles , George Michaels , and Laurance Kinsell

Institute for Metabolic Research, Highland-Alameda County Hospital, Oakland 6, California

The lipid composition of human chylomicrons has been studied using blood collected from normal male volunteers after ingestion of 200 g of butter fat. The concentration of chylomicrons in the blood samples varied widely among 12 subjects but in each case the following lipids were present: triglycerides, diglycerides (probably the 1,2-isomers), monoglycerides, free and esterified cholesterol, traces of free fatty acids, phosphatidyl ethanolamine, phosphatidyl choline, sphingomyelin (two components), and lysolecithin. The fatty acid composition of chylomicron triglycerides was usually similar to that of butter, but myristic and shorter-chain acids showed concentrations lower than those in butter.

Pooled phospholipids were fractionated by preparative thin-layer chromatography. Phosphorus determinations indicated the following proportions of components (mole per cent of total phospholipids): phosphatidyl ethanolamine region, 6%; phosphatidyl choline, 79%; sphingomyelins, 12%; lysolecithin, 4%. The fatty acid compositions of the chylomicron phospholipids have been determined. The total sphingomyelin region contained C₂₂, C₂₃, C₂₄, and C₂₄ monoenoic acids as major components.

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