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Fatty Acid Composition of the Lipid Fractions from Bovine Serum Lipoproteins^{1, 2,}

Department of Dairy Science, Pennsylvania Agricultural Experiment Station, University Park

ABSTRACT

Weights and fatty acid composition of the lipid fractions have been determined from bovine serum lipoproteins separated ultracentrifugally at a solvent density of 1.063 g/ml and corresponding in eleetrophoretic mobility to - and ß-lipoproteins. The vast proportion of serum lipids was contained in the high-density lipoproteins (D > 1.063), with the marked exception of the triglycerides, which were evenly divided. Degree of saturation in the high-density lipoprotein total lipids was 27% and ranged from cholesteryl esters 8.4%, phospholipids 50%, nonesterified fatty acids 65%, to triglycerides 80%. The low-density lipoproteins (D < 1.063) showed a 74% degree of saturation in their total lipids which varied from phospholipids 73%, triglycerides 84%, nonesterified fatty acids 86% to cholesteryl esters 89%. Fatty acid distribution indicated a large concentration of linoleate in the total lipids and cholesteryl esters of the high-density lipoproteins. This concentration was dispersed in their other lipid fractions. The low-density lipoproteins contained chiefly palmitate and stearate in all lipid fractions. Triglycerides in both high- and low-density lipoproteins were notably similar in weight, saturation, and fatty acid composition.

¹ Authorized for publication as Paper No. 2490 in the Journal Series of the Pennsylvania Agricultural Experiment Station.

² Supported in part by the U. S. Public Health Service (H3632).