Mosley, Erin E. and Nudda, Anna and Corato, Adolfo and Rossi, Erica and Jenkins, Tom C. and McGuire, Mark A. (2006) Differential biohydrogenation and isomerization of [U-13C]oleic and [1-13C]oleic acids by mixed ruminal microbes. Lipids, Vol. 41 (5), p. 513-517. eISSN 1558-9307. Article.
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The additional mass associated with 13C in metabolic tracers may interfere with their metabolism. The comparative isomerization and biohydrogenation of oleic, [1-13C]oleic, and [U-13C]oleic acids by mixed ruminal microbes was used to evaluate this effect. The percent of stearic, cis-14 and -15, and trans-9 to -16 18:1 originating from oleic acid was decreased for [U-13C]oleic acid compared with [1-13C]oleic acid. Conversely, microbial utilization of [U-13C]oleic acid resulted in more of the 13C label in cis-9 18:1 compared with [1-13C]oleic acid (53.7 vs. 40.1%). The isomerization and biohydrogenation of oleic acid by ruminal microbes is affected by the mass of the labeled tracer.
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