HS-GC-O-MS分析细叶韭花易挥发性风味成分

采用顶空-气相色谱-质谱联用技术对细叶韭花中易挥发性成分的萃取条件及气相色谱-质谱分离检测条件进行系统研究,并结合嗅闻仪确定挥发性风味成分。在选定HP-5MS色谱柱的分离条件下,最优顶空条件为样品用量1.0 g/20.0 mL顶空瓶,平衡温度100℃,平衡时间40 min。结果表明:经气相色谱-嗅闻-质谱联用分析,共分离得到52种化合物,确定结构46种,占总易挥发性成分的99.15%。其中,含硫类17种、醛类10种、烃类4种、酮类4种、呋喃类3种、醇类4种、酸类2种、芳香族类1种、萜类1种。根据嗅闻结果结合相对气味活度值可得,细叶韭花挥发性风味成分主要是二甲基硫醚、二甲基二硫醚、二甲基三硫醚、3-甲基丁醛、2-甲基丁醛、1,3-二噻烷。

Analysis of the Volatile Compounds in the Flowers of Allium tenuissimum by Headspace-Gas Chromatography- Olfactometry-Mass Spectrometry

The extraction and gas chromatography-mass spectrometry (GC-MS) conditions for analysis of volatile flavor compounds in Allium tenuissimum flowers were systematically studied. An HP-5MS chromatographic column was chosen and the optimal conditions were determined. In this investigation, 1.0 g of sample was extracted at 100 ℃ for 40 min in a 20-mL headspace vial. Under these conditions, a total of 52 compounds were isolated by headspace-gas chromatographyolfactometry- mass spectrometry (HS-GC-O-MS), of which 46 accounting for 99.15% of the total volatile substances, were structurally identified. These compounds included 17 sulfurs, 10 aldehydes, 4 hydrocarbons, 4 ketones, 3 furans, 4 alcohols, 2 acids, 1 aromatic compound, and 1 terpenoid compound. According to the result of olfactometry and relative odor activity value (ROAV), the main flavor volatile components were identified as dimethyl sulfide, 2-methyl-,disulfide, dimethyl trisulfide, 3-methyl-,butanal, 2-methyl,butanal, and 1,3-dithiane.