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Correspondence to:
Thomas C. Jenkins, at Clemson University, 151 Poole Ag. Center, Clemson, SC 29634., tjnkns{at}clemson.edu (E-mail)
Ruminant products are significant sources of dietary trans fatty acids. Trans fatty acids, including various conjugated linoleic acid isomers, have been shown to act as metabolic modifiers of lipid metabolism. Trans fatty acids originate from biohydrogenation of dietary unsaturated fatty acids by gut microbes; however, the exact synthetic pathways are unclear. It was our goal to examine the biohydrogenation pathway for oleic acid, where oleic acid is hydrogenated directly to stearic acid. Our objective in this study was to trace the time course of appearance of 13C in labeled oleic acid to determine if trans monoenes are formed from the 13C-labeled oleic acid or if the 13C appears only in stearic acid as described in reviews of earlier work. Enrichments were calculated from the mass abundance of 13C in major fatty acid fragments and expressed as a percentage of total carbon isotopomers. Significant 13C enrichment was found in stearic acid, oleic acid, trans-6, trans-7, and in all trans C18:1 in positions 9–16.
We concluded that the biohydrogenation of oleic acid by mixed ruminal microbes involves the formation of several positional isomers of trans monoenes rather than only direct biohydrogenation to form stearic acid as previously described. — Mosley, E. E., G. L. Powell, M. B. Riley, and T. C. Jenkins. Microbial biohydrogenation of oleic acid to trans isomers in vitro. J. Lipid Res. 2002. 43: 290–296.
Supplementary key words:
biohydrogenation, oleic acid, trans monoenes, ruminal microbes
Copyright © 2002 by Lipid Research, Inc.
Microbial biohydrogenation of oleic acid to trans isomers in vitro
Erin E. Mosleya,
Gary L. Powellb,
Melissa B. Rileyc, and
Thomas C. Jenkinsa
a Department of Animal and Veterinary Sciences, Clemson University, Clemson, SC 29634
b Department of Genetics and Biochemistry, Clemson University, Clemson, SC 29634
c Department of Plant Pathology and Physiology, Clemson University, Clemson, SC 29634
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