Conjugated linoleic acid (CLA) isomers: formation, analysis, amounts in foods, and dietary intake

Abstract

The analysis, content, and daily intake of conjugated linoleic acid isomers (CLA) are presented in the following review. Modern analytical techniques such as capillary gas chromatography (GC), silver -ion high performance liquid chromatography (Ag + -HPLC) combined with different detection methods (flame ionisation, mass spectroscopic, ultra violet) are mandatory for the unequivocal determination of geometric and positional CLA isomers. An overview is given on the CLA contents in 139 German foods, e. g. milk/dairy products, meat/meat products, edible oils, margarines, fish, and deep fried products. The dietary intake for men and women is estimated using consumption data.