Abstract
The fatty acids compositions of 15 butter oil samples (New Zealand 5, Australian 3, Swedish 4 and American 3) were determined by gas-liquid chromatography.
The composite fatty acids in each milk fat from butter oils were converted to their methyl esters by the interesterification with KOH-methanol and their methyl esters were separated gas-chromatographically on a polymerized ethyleneglycol succinate column.
The following fatty acids were identified in every samples:(1) saturated even number fatty acids from C4 to C20, (2) oleic, linoleic and linolenic acid, (3) unsaturated fatty acids of 10, 12, 14 and 16 carbons, (4) saturated fatty acids of 13, 15 and 17 carbons.
Fatty acids compositions of butter oil samples were varied by seasonal conditions and different among countries.
In the summer samples except for the ones from New Zealand, stearic and oleic acids were present in higher concentration than in the others. The trend was reversed with palmitic and myristic acids, which were higher in winter.
