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The Fatty Acids of Adrenal Lipids from Rats Fed Partially Hydrogenated Soybean Fat^1,2,

The Burnsides Research Laboratory, University of Illinois, Urbana, Illinois 61801

The effect of partially hydrogenated soybean fat on the lipid composition of rat adrenals has been determined. The experimental fat contained 48% trans fatty acids and traces of linoleic acid. When fed at levels of 10 and 20% by weight of the diet for 5 months, an increase in the concentration of cholesterol esters was observed and elaidic acid incorporated in amounts of 22% of total fatty acids in cholesterol esters, 17% in triglycerides, and 7% in phospholipids. In addition, an acid identified as 9,13-docosadienoic acid occurred in the cholesterol ester and the phospholipid fractions. In particular, when the experimental fat was fed at 20% level, the acid amounted to 24 and 16% concentration in adrenal cholesterol esters and phospholipids, respectively. On supplementing the experimental diet with 2% corn oil, the 9,13-docosadienoic acid diminished whereas the concentration of trans fatty acids remained practically unchanged.

² Taken from a thesis submitted by P. O. Egwim in partial fulfillment of the Ph.D. degree in Food Science, University of Illinois at Urbana-Champaign.

³ Present address: Department of Pathology, Woodruff Medical Center, Emory University, Atlanta, Georgia 30322.

Manuscript received 10 August 1970.