Abstract
ABSTRACT The content ofTrans C18:1,Trans C18:2 and cis9trans11 C18:2 (CLA) in the marketed fat blends was evaluated by capillary gas chromatography and silver thin‐layer chromatography. For comparison, the level of these acids was also determined in commercial butter, purchased at the same time. The content ofTrans C18:1 in fat blends showed that half of the examined products containedTrans C18:1 at 1.9–4.4%, while the other half contained 8.2–24.2%Trans fatty acids. The fat blends with a high total content ofTrans C18:1 were characterized by a high proportion ofTrans 6–8 andTrans 9 isomers. TheTrans 9 C18:1 in these products constituted 15.0–22.5% of the totalTrans C18:1. The level ofTrans C18:2 in fat blends examined ranged from 0.3 to 1.1%. Seven of the 18 tested fat blends contained, apart from cis‐trans andTrans‐cis C18:2, alsoTrans‐trans C18:2 in the 0.03–0.4% range. In all fat blends examined, CLA was present. The products with a low level ofTrans C18:1 contained CLA at 0.3–1.0%. The content of CLA in the fat blends with high level ofTrans C18:1 did not exceed 0.3%.
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