Sensitive determination of volatile aliphatic aldehydes in autoxidized fats and oils by gas chromatographic / electron-capture detection of their O-pentafluorobenzyloxime derivates
1997
Kreyenmeier, F. | Schulte, E. | Thier, H.-P.
This paper describes a novel method for the sensitive determination of the volatile aliphatic aldehydes formed by autoxidation in fats and oils. In a solution of fats, the aldehydes are derivatized to the O-pentafluorobenzyloximes(PFBOs) without any isolation procedure. From the mixture, the lipids are removed by silica gel column chromatography using pentane / dichloromethane (4+1) as the eluant. The eluate is evaporated to dryness and the PFBOs are extracted from the residue with a small volume of acetonitrile. They are separated by capillary column gas chromatography and are determined with high selectivity and sensitivity ba using an electron-capture detector. The determination limit was as low as 0.01 mg/kg for hexanal. Analysis of a series of corn oil samples yielded high recoveries for 14 aldehydes added at the 1 mg/kg level, with low relative standard deviations of between 3 and 17 %.
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