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Seventeen commercial samples of German margarines were analyzed by gas‐liquid chromatography for the trans fatty acid (TFA) content including the following mixture of geometrical and positional isomers: 14:1 t9, 16:1 t9, 18:1 t6‐t11, 18:2 c9t12, 18:2 t9c12, 18:2 t9t12 and 18:3 trans‐isomers. Conventional vegetable and fat reduced margarines were found to contain 0.3–4.1% TFA, whereas diet margarines contained 0.2–0.5% TFA. Highest amounts of TFA were found in sunflower margarines (3.3–4.9% TFA). A significant decrease of the TFA amounts in German margarines since 1994 could be observed.
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Fritsche et al. (1997) studied this question.
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