Identification and quantitation of volatile compounds in two heated model compounds, trilinolein and linoleic acid esterified propoxylated glycerol.
Static headspace (HS) and capillary gas chromatography/infrared spectroscopy-mass spectrometry (GC/IR-MS) were used to collect, separate, identify, and quantitate the oxidative and thermal decomposition products in two heated model compounds, linoleic acid esterified propoxylated glycerol (EPG-08 linoleate) and trilinoleylglycerol, both without added antioxidants. Approximately 4 L of EPG-08 linoleate or trilinoleylglycerol was heated in a deep-fat fryer at 192 +/- 8 degrees C for 12 h each day until the oil sample contained > or =20% polymeric material, which occurred after 24 h of heating. The major volatile compounds both in heated EPG-08 linoleate and in heated trilinoleylglycerol were pentane, hexanal, 2-heptenal, 1-octen-3-ol, 2-pentylfuran, 2-octenal, and 2, 4-decadienal. The identified volatile compounds from heated EPG-08 linoleate are those generally expected from the oxidative and thermal decomposition of fats and oils containing linoleic acid, except acetoxyacetone (1-acetoxy-2-propanone). Acetoxyacetone was found at 2.1, 3, and 2.4 ppm in the unheated, 12 h heated, and 24 h heated samples, respectively.
Mahungu
S M
SM
Department of Chemistry, Egerton University, Njoro, Kenya.
Hansen
S L
SL
Artz
W E
WE
D000447:Aldehydes / Q000737:chemistry; D002850:Chromatography, Gel; D005989:Glycerides / Q000032:analysis*; D010084:Oxidation-Reduction; D014280:Triglycerides / Q000032:analysis*
D000447:Aldehydes; C412888:EPG 08 linoleate; D005989:Glycerides; D014280:Triglycerides; C009564:trilinolein