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Triglyceride molecular species in some vegetable oils were analyzed by capillary column gas chromatography and electron impact ionization mass spectrometry utilizing selected ion monitoring. Triglycerides were separated according to their molecular weights and their degrees of unsaturation on 25m x 0.25mm fused silica open tubular capillary column coated with a phenylmethylsilicone gum stationary phase and in an analysis time less than 13 min. Triglyceride molecular species were identified by analyzing the fragment ions having the same time on the selected ion monitoring profile. The major triglyceride molecular species in each oils were C_(18:1)·C_(18:2)·C_(18:2)(OLL: 18.3%), C_(18:2)·C_(18:2)·C_(18:2)·(LLL;14.3%), C_(18:0)·C_(18:2)·C_(18:2)·(SLL; 14.1%), C_(18:0)·C_(18:2)·C_(18:2)·(PLL; 13.2%), C_(16:0)·C_(18:2)·C_(18:1)·(PLO: 11.6%) in corn oil, C_(18:2)·C_(18:2)·C_(18:2)·(LLL; 18.0%), C_(18:0)·C_(18:2)·C_(18:2)·(OLL; 18.0%), C_(16:0)·C_(18:2)·C_(18:2)·(PLL; 17.1%) in safflower oil, C_(16:0)·C_(18:2)·C_(18:2)·(PLL; 23.5%), C_(16:0)·C_(18:2)·C_(18:1)·(PLO; 13.8%), C_(18:0)·C_(18:1)·C_(18:1)·(SOO; 13.5%), C_(18:1)·.C_(18:2)·C_(18:2)·(OLL; 10.6%) in cottonseed oil.
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