Quantification and identification of
the individual fatty acid methyl esters was achieved by the use of external standards
(qualitative and quantitative (fatty acid methyl esters multi-standard C4–C25 (Eurofins,
in house composite of individual fatty acid methyl esters standards)), and an
analytical quality control (AQC) sample (anhydrous milk fat spiked
with cod liver oil (Eurofins, in house preparation)).