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Observations on Free Fatty Acids of Skim Milk

Eastern Regional Research Center¹, Philadelphia, PA 19118

ABSTRACT

Negligible amounts of free fatty acids with greater than twelve carbon atoms are in the dialysate of skim milk obtained by vacuum dialysis. The 6- through 12-carbon free fatty acids exist in equilibrium between the dialyzable and nondialyzable fractions of skim milk at 23 C. The percentage of the 4- through 12-carbon free fatty acids of skim milk in the aqueous phase decreases with increasing molecular weight (av. six determinations: 4 carbon 102.1 ± 10.7%; 6 carbon 93.1 ± 8.6%; 8 carbon 83.6 ± 5.1%; 10 carbon 58.6 ± 7.8%; 10:1 carbon 64.2 ± 5.6%; and 12 carbon 19.6 ± 4.5%).

¹ Agricultural Research Service, U.S. Department of Agriculture.