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Journal of Lipid Research, Vol. 3, 84-87, January 1962
Copyright © 1962 by Lipid Research, Inc.

Disproportionate labeling of oleic and linoleic acids during the biosynthesis of uniformly labeled fatty acids

Robert H. Coots

The Procter and Gamble Company, Miami Valley Laboratories, Cincinnati 39, Ohio

Fatty acids uniformly labeled with C¹⁴ were obtained by growing Penicillium javanicum, in the presence of uniformly labeled acetate, on a nitrogen-deficient medium. When uniformly labeled acetate was the C¹⁴ source, the specific activity of the linoleic acid was greater than the specific activity of the oleic acid. The reverse was true when uniformly labeled sucrose was the C¹⁴ source. It is suggested that the disproportionate labeling observed between oleic acid and linoleic acid is the result of changing relative rates of synthesis of these acids coupled with an acetate pool of changing specific activity.

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