DETERMINATION OF TRANS-OCTADECENOIC ACIDS IN GERMAN MARGARINES, SHORTENINGS, COOKING AND DIETARY FATS BY AG-TLC GC/

According to numerous, even recent studies, trans fatty acids (TFA) ar e related to coronary heart disease. Thus, for the evaluation of the d aily TFA-intake precise data on the content of TFA in currently availa ble edible fats are of great interest. The present study gives a compr ehensive overview on total trans-octadecenoic acid contents in 93 bran ds of German margarines, shortenings, cooking and dietary fats purchas ed in 1994, that were obtained by a two-dimensional chromatography met hod (Ag-TLC/GC). Conventional margarines were found to contain 0.17 - 25.90 wt% (n = 46) and shortenings/cooking fats 0.04-32.51 wt% (n = 16 ) TFA related to total fatty acids. Mean values were 9.32 resp. 9.79 % , whereas dietary and reformatory fats exhibited a mean of 0.65 % (n = 31) TFA. Among conventional margarines the highest TFA contents were detected in products (n = 11) derived exclusively from sunflower oil ( mean value = 20.71 %). Seasonal changes in single brands were relative ly small.