不同产地初榨菜籽油挥发性风味成分比较分析

为了研究不同产地初榨菜籽油挥发性成分的变化规律，采用气相色谱-质谱和电子鼻相结合的方法，对不同挥发性风味成分进行比较研究。利用气相色谱-质谱数据对关键风味成分的相对气味活度值（ROAV）进行主成分分析，确定其主体挥发性成分。应用综合评价指标（GEI）对各产地初榨菜籽油香气进行评价。结果表明:由10个产地样品共检测出177种挥发性成分，根据ROAV鉴定出14种主体风味成分，主要包括硫甙降解产物、醛类和吡嗪类等。各产地的挥发性成分主要是3-乙基-2, 5-甲基吡嗪、壬醛、2, 4-癸二烯醛、甲烯丙基氰、苯乙醛、月桂醛等，不同产地菜籽油样品香气差别显著，GEI评价结果表明，香气品质最优的产地是成都。各产地初榨菜籽油挥发性成分既有一定的相似性，但差异性也较大，展现其各自独特的风味。

Comparative Analysis of Volatile Flavor Compounds in Virgin Rapeseed Oil from Different Producing Areas

Flavor profiles of virgin rapeseed oils (VROs) were comparatively studied for trend of change of various flavor types by using gas chromatography-mass spectrometry (GC-MS) and electronic nose (E-nose). The relative odor activity values (ROAVs) of key odorants detected by GC-MS data were visualized to discriminate VROs with various flavors by using principal component analysis (PCA) to determine the main volatile components. Based on general evaluation index (GEI), the aroma of VROs of different place of production was evaluated. Results showed that, 177 volatile components were detected from 10 samples from different regions. 14 main flavor components were identified according to ROAV, including glucoside degradation products, aldehydes and pyrazines. 3-ethyl-2, 5-methylpyrazine, nonanal, 2, 4-decadienal, methallyl cyanide, phenylacetaldehyde, lauric aldehyde, etc. were the main volatile compounds in the VRO from different places. The aroma of VROs were significantly different, and the GEI evaluation results showed that, the producing area with the best aroma quality was Chengdu. The volatile composition of the VROs from different places had certain similarities and also large differences, and took on their own unique qualities and flavors.