ISSN:
1431-4630
Schlagwort(e):
Key words Fats and oils
;
Autoxidation
;
Aldehydes
;
GC/ECD
;
Derivatization
Quelle:
Springer Online Journal Archives 1860-2000
Thema:
Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
Notizen:
Abstract 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 by 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%.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1007/s002170050190
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