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- W2486220319 abstract "Besides the trans positional isomers of oleic acid (trans-C18:1) also cis/trans positional isomers of linoleic acid (trans-C18:2) are supposed to be related to a number of negative physiological effects. The trans-C18:2 area, comprising all isomers with at least one trans double bond, is rather complex and has been investigated little by gas chromatographic (GC) analysis so far. Depending on the analytical conditions, numerous overlaps between C18:2 isomers, saturated or monounsaturated fatty acids (FA) occur. Based on several isothermal analyses on a highly polar 100-m GC column (130, 140 to 190°C) in combination with pre-separations using argentation thin-layer chromatography a separation of the trans Δ9, trans Δ12 isomer (t9t12), further trans-C18:2 isomers as well as C18:1 isomers like cis Δ16-C18:1 could be achieved. The isomer t9t12 is of particular interest from the viewpoint of nutritional physiology. Furthermore, mass spectrometric analysis allowed the identification of the rarely described 11-cyclohexylundecanoic FA. Depending on the column temperature, this FA shifts across a wide range of the C18:1/C18:2 isomeric region leading to many quantitative falsifications as a result of overlaps with other peaks. In 100 milk fats mean contents of t9t12 and the cyclohexyl FA of 49′24 mg/100 g and 0.16′0.03g/100 g FA could be established. Additionally, interferences of the linoleic acid peak with trans Δ11,cis Δ51-C18:2, cis Δ9,cis Δ15-C18:2 and C19:1 could be demonstrated, resulting in an overestimation of linoleic acid of up to 86% at certain column temperatures." @default.
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- W2486220319 date "2003-01-01" @default.
- W2486220319 modified "2023-09-24" @default.
- W2486220319 title "Overestimation of linoleic acid and trans-C18:2 isomers in milk fats with emphasis on trans Δ9,trans Δ12-octadecadienoic acid" @default.
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