SIMILAR DISTRIBUTION OF TRANS FATTY-ACID ISOMERS IN PARTIALLY HYDROGENATED VEGETABLE-OILS AND ADIPOSE-TISSUE OF CANADIANS

The objective of this study was to evaluate the composition of trans f atty acids in the subcutaneous fat of Canadians relative to the compos ition of dietary sources of trans fatty acids. The fatty acid composit ion, total trans fatty acid content, and the geometric and positional isomer distribution of unsaturated fatty acids of subcutaneous adipose tissue of Canadians were determined using a combination of capillary gas-liquid chromatography and silver nitrate thin-layer chromatography . The mean total trans fatty acid content was 6.80% at the abdominal s ite and 5.80% at the lateral thigh site. Total trans isomers of linole ic acid (18:2n-6) were present at 1.17% in abdominal and 1.59% in thig h adipose tissue, with 9c,12t-18:2 being the most prevalent isomer fol lowed by 9c-13t-18:2 and 9t,12c,-18:2. The oleic acid (18:1) trans iso mer distribution in adipose tissue differed from that in butter fat, b ut it was similar to that in partially hydrogenated vegetable oils. Th e reverse was true for the 18:1 cis isomers. Total 18:1 trans isomers were inversely related to 18:2n-6 content in adipose tissue, suggestin g the trans fatty acid intake is inversely related to the intake of li noleic acid. Partially hydrogenated vegetable oils appear to be the ma jor source of trans fatty acids in adipose tissue of Canadians.