Recent trends in the fatty acid composition of German sunflower margarines, shortenings and cooking fats with emphasis on individual C16:1, C18:1, C18:2, C18:3 and C20:1 trans isomers.

摘要: In some countries the content of trans fatty acids (TFA) in margarines has strongly decreased as a result continuous discussion on their disadvantages regarding aspects nutritional physiology. However, still 1994 almost 1/3 total part German sunflower margarines, shortenings and cooking fats comprised these unfavourable TFA. present study main interest was laid trans-C16:1, trans-C18:1, trans-C20:1, trans-C18:2 trans-C18:3 particularly individual isomers, negative metabolic activity TFA possibly might only be attributable to certain isomers. By combining argentation thin-layer chromatography with gas using 100-m capillary column (CP-Sil 88) acid contents were determined nearly all brands (SFM; n = 9) (CFS; 10). Concerning above-mentioned groups isomers mean 0.01, 4.88, 0.00, 0.45 0.03% for SFM well 5.02, 0.03, 0.70 0.17% CFS established, respectively. The re-evaluation samples from 1996 exhibited that (sum mentioned isomers) 21.77% (range: 13.78-26.29; 11) 5.37% (1.98-6.15%; between 1999. Also average 11.77% (0.08-33.63; 16) 12.52% (1.61-26.79%; 7) 5.91% (0.43-19.72%; 10) even newest partly relative high contents. addition positional quantified compared different years. conjugated linoleic (cis delta 9, occurred small amounts 0.02% current CFS.