基于电子鼻和ATD-GC-MS技术分析茉莉花茶香气成分的产地差异

为探究茉莉花茶香气成分的产地差异，采用电子鼻和自动热脱附-气相色谱-质谱联用仪（automatic thermal desorption-gas chromatography-mass spectrometry, ATD-GC-MS）对福州和横县两地的茉莉花茶进行测定。结果表明，电子鼻传感器对横县茉莉花茶的响应值总和明显大于福州茉莉花茶；将电子鼻数据结果进行多元统计分析可以实现茉莉花茶样品的产地区分。ATD-GC-MS数据结果表明，福州和横县茉莉花茶香气指数（Jasmine tea flavor index，JTF index）分别为7.57和2.89，两者差异显著（P<0.05）；两地茉莉花茶的29种香气组分含量差异达到显著水平（P<0.05），其中包括影响茉莉花茶香气鲜灵度的顺-3-己烯醇苯甲酸酯、α-法呢烯和吲哚。福州茉莉花茶和横县茉莉花茶的香气成分在种类上相似，而香气成分含量差异显著。电子鼻结合ATD-GC-MS技术可作为茉莉花茶香气成分产地差异分析的有效方法。

Origin Difference Analysis of Aroma Components in Jasmine Tea Based on Electronic Nose and ATD-GC-MS

In order to investigate the origin differences of aroma components in jasmine tea, electronic nose and automatic thermal desorption-gas chromatography-mass spectrometry (ATD-GC-MS) were used to determine the jasmine tea from Fuzhou and Hengxian. Electronic nose measurement showed that the total response value of sensors to jasmine tea from Hengxian was significantly greater than jasmine tea from Fuzhou. Through multivariate data analysis of electronic nose data, the origins of jasmine tea could be quickly and effectively identified. The results of ATD-GC-MS data showed that the jasmine tea flavor (JTF) index in tea samples from Fuzhou and Hengxian was significantly different (FZ: 7.57; HX: 2.89) ( P<0.05). And the contents of 29 aroma components were also significantly different between jasmine tea from Fuzhou and Hengxian (P<0.05). These include cis-3-hexenol benzoate, α-farnesene and indole, which affected the freshness and sensitivity of aroma in jasmine tea. The aroma components of jasmine tea from Fuzhou and Hengxian were similar in species, while the content of aroma components was significantly different. Electronic nose combined with ATD-GC-MS technology can be used as an effective method for origin difference analysis of aroma components in jasmine tea.