基于气相-离子迁移谱分析不同产地“汉中仙毫”气味指纹差异

Analysis of“Hanzhong Xianhao”odor fingerprints from different places based on GC-IMS

为便于“汉中仙毫”绿茶质量区分和品牌管理,利用气相-离子迁移色谱(gas chromatograph-ion mobility spectrometer,GC-IMS)分析了不同产地(南郑、勉县、镇巴、西乡、宁强)“汉中仙毫”的气味指纹差异。结果表明,GC-IMS技术可以对不同产地“汉中仙毫”气味物质实现较好分离。不同产地“汉中仙毫”中共鉴定出61种挥发性气味物质,包括醛类30种、酮类12种、酯类7种、醇类6种、呋喃类4种和酸类2种。主成分分析表明,不同产地“汉中仙毫”挥发性气味成分气相-离子迁移谱呈现出一定差异,2个主成分累计贡献率达到73%,说明基于GC-IMS技术可以对“汉中仙毫”进行产地区分。该研究建立了“汉中仙毫”挥发性气味物质指纹图谱,可视化呈现了不同产地茶叶气味物质差异,对今后“汉中仙毫”品质控制、产地区分、质量评估以及品牌管理提供了方法。

In order to facilitate the quality classification and brand management of“Hanzhong Xianhao”green tea,gas chromatography-ion mobility spectroscopy(GC-IMS)was used to analyze the differences of odor fingerprints of“Hanzhong Xianhao”from different producing areas(Nanzheng,Mianxian,Zhenba,Xixiang,and Ningqiang).The results showed that GC-IMS technology could be used to separate the odorants of“Hanzhong Xianhao”of different origins.A total of 61 volatile odorants were identified from five different producing areas,including 30 aldehydes,12 ketones,7 esters,6 alcohols,4 furans and 2 acids.The principal component analysis showed that there were differences in volatile odor components in“Hanzhong Xianhao”,and the cumulative contribution rate of the two principal components reached 73%which indicated that the origin of“Hanzhong Xianhao”could be discriminated based on GC-IMS technology.This study established the fingerprint of volatile odorants of“Hanzhong Xianhao”and visualizes the odor differences of tea samples from different producing areas,which could provide a method for its quality control,origin discrimination,quality evaluation and brand management in the future.