Comparison of Volatile Components in Commercial Vegetable Oils and Gutter Oils from Hunan Cuisine
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Abstract:
Solid phase micro-extraction coupled with gas chromatography-mass spectrometry (SPME/GC-MS) was applied to analyze the volatile components in 25 commercial vegetable oils and 41 gutter oils from the interceptor sewers of Hunan cuisine restaurants in Guangzhou. In total, 113 types of volatile components were detected in gutter oils, and 71 types were found in vegetable oils. Aldehydes and alkenes were the most abundant components of gutter oils, while vegetable oils contained mainly aldehydes and other volatile components. Acid components were most abundant in gutter oils, and vegetable oils contained only trace amounts of acids. Ethers and aromatics were detected in gutter oils but not in vegetable oils. Gutter oils generally contained limonene, which were not detected in vegetable oils. In addition, allicin was detected in gutter oils but not in vegetable oils. Therefore, large amounts of acids, ethers, aromatics, limonene, and allicin can be used as indicators for gutter oils. This provides a strong basis for the identification of gutter oils and adulterated vegetable oils.
