Solid Phase Microextraction of Volatile Soybean Oil and Corn Oil Compounds

The qualitative and quantitative determination of volatile compounds in soybean and corn oils were analyzed by solid phase microextraction. Coefficients of variation and sensitivity of polydimethylsiloxane, carboxen/ polydimethylsiloxane, polyacrylate, and carbowax/divinylbenzene for hexanal analysis in soybean oil were 3.2, 4.2, 7.2, and 10.7%, and 15, 30, 20, and 10 ppb, respectively. Volatile compounds of soybean oil with peroxide value (PV) of 1 or 5 were extracted by polydimethylsiloxane at 60 °C for 60 min. The amount of volatile compounds of PV 5 soybean oil was 92% higher than the PV 1. Volatile compounds including 2,4-decadienal, 2-decenal, hexanal, and pentane were identified in soybean and corn oils by SPME-GC-MS and GC retention time. SPME was a simple, reproducible and sensitive method for the analysis of volatile compounds of vegetable oils. Les composes volatils presents dans les huiles de soja et de mais sont dosees par microextraction en phase solide. L'effet de la phase solide, de le temperature et de la duree de l'extraction et du volume de l'echantillon sur la sensibilite et l'amelioration de la methode sont observes. Les produits oxydes (valeurs de peroxyde de 1 a 5) dans les 2 huiles sont compares.

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