Nofima reports

Rapport/Report 21/2011 English summary

Mjøs, Svein Are; Haugsgjerd, Bjørn Ole

Publication details

Publisher: Nofima AS

Issue: 21/2011

Number of pages: 5

International Standard Numbers:
Printed: 978-82-7251-881-2

Open Access: green


At conditions commonly applied for trans fatty analyses by gas chromatography, fatty acids naturally occurring in marine lipids may overlap chromatographically with C16 and C18 trans fatty acids and lead to false positives. Elution patterns were studied by tracking retention indices at shifting temperature conditions on two cyanopropyl coated capillary columns. Most overlaps can be avoided by selecting the right chromatographic conditions, but it was not possible to find a single condition that eliminates the risk of overlap between trans fatty acids and interferents.
In total, seventeen compounds were identified as potential interferents, and the amounts of these compounds were quantified in various samples of marine origin. The interferents that will most likely contribute to incorrect assessments of trans fatty acids in marine lipids are probably 18:3 n–4 and 18:1 n–11.