3种清香型铁观音挥发性成分及香味特征

运用顶空固相微萃取技术结合气相色谱质谱联用仪（HS-SPME-GC-MS）和感官评价分析清香型铁观音的挥发性成分和主要风味特征。通过GC-MS检测分析，在3种清香型铁观音中共发现34种挥发性成分，主要成分均为反式-橙花叔醇、吲哚、正己醛、α-法呢烯，质量含量分别为24751~41899、19958~33929、1875~3467、1033~3361 μg/kg；感官评价结果显示，3种铁观音均具有典型的清香味和花香味；香气值（OAVs）分析表明，3种铁观音中主要风味成分相同，均为癸醛（128.92~299.37）、反式-橙花叔醇（110.01~186.21）、苯乙醛（31.27~37.89）、正己醛（17.86~33.02）和吲哚（9.50~16.16）；聚类分析结合感官评价表明，清香味主要来源于正己醛、苯乙醛和癸醛，花香味主要来源于反式-橙花叔醇。该研究结果说明，3种清香型铁观音的主要挥发性成分和香味特征相似，但和其他乌龙茶具有一定的差异。

Volatile Components and Sensory Characteristics of Three Fresh Scent-Flavor Tieguanyin Teas

Three common fresh scent-flavor Tieguanyin teas were analyzed by sensory evaluation and gas chromatography-mass spectrometer (GC-MS).GC-MS analysis showed that 34 kinds of volatile organic compounds were identified in the three Tieguanyin teas，which all possessed a similar major volatile constituent，i.e.，nerolidol (24751~41899 μg/kg)，indole(19958~33929 μg/kg)，hexanal(1875~3467 μg/kg) and α-farnesene(1033~3361 μg/kg).The three teas samples possessed a typical fresh and floral aroma through sensory evaluation.Besides，odour activity values showed that decanal(128.92~299.37)，nerolidol (110.01~186.21),benzeneacetaldehyde(31.27~37.89),hexanal(17.86~33.02)and indole(9.50~16.16) were the main flavor volatiles.By the combination of cluster analysis and sensory evaluation,it indicated that the fresh odour was mainly attributed to hexanal，benzeneacetaldehyde and decanal;and the floral odour was mainly came from nerolidol .These results suggested that the fresh scent-flavor Tieguanyin teas had similar aromatic profile and volatile components，which was different from those of other types of oolong teas.