LEVELS OF TRANS GEOMETRICAL ISOMERS OF ESSENTIAL FATTY ACIDS IN SOME UNHYDROGENATED U. S. VEGETABLE OILS1

doi:10.1111/j.1745-4522.1994.tb00244.x

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Wiley InterScience

Journal of Food Lipids

Volume 1 Issue 3, Pages 165 - 176

Published Online: 4 May 2007

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LEVELS OF TRANS GEOMETRICAL ISOMERS OF ESSENTIAL FATTY ACIDS IN SOME UNHYDROGENATED U. S. VEGETABLE OILS¹

SEAN. O'KEEFE ¹ , SARA. GASKINS-WRIGHT ¹ , VIRGINIA. WILEY ¹ I-CHEN. CHEN ¹

¹ Food Science and Human Nutrition Department Institute of Food and Agricultural Sciences University of Florida Gainesville, FL 32611–0370

¹ Florida Agricultural Experimentation Station Journal Series No. R03212.

ABSTRACT

ABSTRACT.

Concentrations of trans isomers of 18:2w6 and 18:3w3 were measured in soybean and canola oils purchased in the U. S. Fatty acid methyl esters were prepared by BF₃ catalyzed transesterification and separated using gas chromatography with Omegawax and CPSil88 capillary columns. Fatty acids were identified by comparing retention times with standards and with isomers of 18:2w6 and 18:3w3 in elaidinized linseed oil. Isomers identified included 18:2ct, 18:2tc, 18:3tct+ctt, 18:3cct, 18:3ctc, and 18:3tcc. The degree of isomerizations of 18:2w6 and 18:3w3 ranged from 0.3% to 3.3% and 6.6% to 37.1%, respectively. The trans contents were between 0.56% and 4.2% of the total fatty acids. Consumers will obtain isomerized essential fatty acids from vegetable oils currently marketed in the U. S.

Received for Publication September 8, 1993; Accepted for Publication November 8, 1993

DIGITAL OBJECT IDENTIFIER (DOI)

10.1111/j.1745-4522.1994.tb00244.x About DOI