Publication Date:
2012-05-12
Description:
The levels of trans isomers of eicosapentaenoic (EPA) acid and docosahexaenoic acid (DHA) in 77 omega-3 products on the European market have been studied. Fatty acids were analyzed as fatty acid methyl esters by gas chromatography with a flame ionization detector, using a cyanopropyl coated stationary phase. The amount of mono- trans EPA isomers relative to the corresponding all- cis isomer ranged from 0.19 to 4.5 %. The corresponding values for mono- trans DHA relative to the all- cis isomer ranged from 0.25 to 5.9 %. There was a strong correlation between the degree of isomerization of EPA and DHA, showing that DHA was 1.26 times more isomerized than EPA. Division of the samples into different product groups showed that samples with a low degree of isomerization were found in all groups, except one. This shows that a high degree of isomerization is avoidable, and also points to deodorization of the oils as the main source of trans isomers. Content Type Journal Article Category Original Article Pages 1-9 DOI 10.1007/s11745-012-3672-3 Authors Caterina Sciotto, Department of Chemistry, University of Bergen, P.O. Box 7803, 5020 Bergen, Norway Svein A. Mjøs, Department of Chemistry, University of Bergen, P.O. Box 7803, 5020 Bergen, Norway Journal Lipids Online ISSN 1558-9307 Print ISSN 0024-4201
Print ISSN:
0024-4201
Electronic ISSN:
1558-9307
Topics:
Biology
,
Chemistry and Pharmacology
