The components of onion oil were examined by combined gas-liquid chromatography-mass spectrometry. The various components of the oil were also separated by preparative-scale gas chromatography and examined individually by infrared, nuclear magnetic resonance, and mass spectral techniques. 3,4-Dimethylthiophene, methyl cis-pro-penyl disulfide, methyl trans-propenyl disulfide, cispropenyl propyl disulfide, trans-propenyl propyl disulfide, two methyl propenyl trisulfides, and two propenyl propyl trisulfides not previously reported as occurring in onions were found to be important components of onion oil.

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