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Journal of Lipid Research, Vol. 14, 306-311, May 1973
Copyright © 1973 by Lipid Research, Inc.

Hydrocarbons and polychlorinated biphenyls from the unsaponifiable fraction of anhydrous milk fat

Vincent P. Flanagan and Aldo Ferretti

Dairy Products Laboratory, Agricultural Research Service, U.S. Department of Agriculture, Washington, D.C. 20250

Using a combination of gas-liquid chromatography and mass spectrometry, the presence of 39 aliphatic hydrocarbons was firmly established in the unsaponifiable fraction of anhydrous milk fat. The hydrocarbons were the C₁₄ to C₂₇ and the C₂₉ to C₃₁ straight-chain paraffins, their monoolefin analogs, and the C₂₅ to C₂₉ branched alkanes. Phytene (3,7,11,15-tetramethyl-n-hexadec-2-ene), identified for the first time in milk fat, was isolated and identified by high-resolution mass spectrometry and infrared analysis. The total hydrocarbon content amounted to 30 ppm of the milk fat. Polychlorinated biphenyls also were detected in trace amounts in the area of the chromatogram between the C₁₈ and the C₂₃ hydrocarbons.

Supplementary key words straight-chain alkanes • alkenes • branched alkanes • phytene • gas-liquid chromatography • mass spectrometry

Submitted on October 16, 1972
Accepted on January 10, 1973

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