Annual changes in the content of unsaturated fatty acids with 18 carbon atoms, including cis9trans11 C18:2 (CLA) acid, in milk fat
2006
Zegarska, Z. | Paszczyk, B. | Rafalowski, R. | Borejszo, Z.,University of Warmia and Mazury, Olsztyn (Poland). Dept. of Commodity Science and Food Analysis
The fatty acid composition of milk fat during a year was determined by gas chromatography with the use of a 100-m capillary column with high-polar liquid phase. The experimental material were samples of fat isolated with the extraction method from 30 percent non-pasteurized cream. The study demonstrated that the range of changes in the content of trans isomers of milk fat over a year was significantly higher than that of cis isomers of those acids. The content of C18:1 trans isomers and cis9trans11 C18:2 (CLA) acid was ca. 3-fold higher, whereas that of trans isomers of C18:2 acid - about 2.5-higher in milk fat from summer feeding of the cows as compared to their concentrations in milk fat from winter feeding. The content of cis9trans11 C18:2 acid in milk fat during a year ranged from 0.39 to 1.76 percent of the total fatty acid composition. The average content of oleic acid in milk fat from the period of summer feeding accounted for 20.63 percent and was higher by 2.6 percentage units as compared to fat content in the winter feeding. The concentration of linoleic acid in fatty acid composition was almost constant during a year. The contribution of linolenic acid was reported to range from 0.38 to 1.46 percent and its content of milk fat from the period of summer feeding was twice as much as that of milk fat from the winter feeding period
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