3个茶树品种(品系)鲜叶香气特征及萜烯指数分析

运用顶空固相微萃取-气质联用法分析福鼎大白茶、黔茶1号、黔茶8号茶树鲜叶的挥发性香气物质.结果表明:共检测到73种不同的挥发性芳香物质,其中福鼎大白茶44种,黔茶1号35种,黔茶8号50种,共有香气成分17种,占全部香气物质的百分比达到90%以上.芳樟醇及其氧化物、香叶醇、青叶醇、乙酸叶醇酯、水杨酸甲酯和己醛在3个茶树品种(品系)鲜叶中含量较为丰富,共同作用形成茶树鲜叶清香;芳樟醇、香叶醇、4-戊烯醛、青叶醛、壬醛、乙酸叶醇酯、水杨酸甲酯等物质在3个茶树品种(品系)间含量差异较大,可作为关键香气物质进行茶树品种的鉴定区分.3个茶树品种(品系)的萜烯指数为福鼎大白茶(0.73)、黔茶8号(0.65)、黔茶1号(0.89),黔茶1号萜烯指数接近野生大树茶,说明筛选出黔茶1号的湄潭苔茶群体品种是较为原始的茶树资源.

Analysis of Volatile Aroma Components and Terpene Index in 3 Tea Varieties or Strains

The volatile aroma components in tea fresh leaves were extracted by headspace solid-phase micro-extraction(HS-SPME)and analyzed by gas chromatography-mass spectrometry(GC-MS).The results show that there were a total of 73 different kinds volatile aroma ingredients,44 kinds of aromatic substance were detected in the fresh leaves of Fuding-dabaicha,35 kinds of aroma substance were detected in the fresh leaves of Qiancha 1,50 kinds of aromatic matters in the fresh leaves of Qiancha 8,17 of them were identical and accounted for more than 90%.The main fragrant components in tea fresh leaves were linalool,trans-Linalool oxide,cis-Linalool oxide,geraniol,cis-3-Hexenol cis-3-hexenyl acetate,methyl salicylate and hexanal.linalool,geraniol,4-Pentenal,(E)-2-hexenal,nonanal,cis-3-hexenyl acetate and methyl salicylate were showed great differences in 3tea varieties or strains.Terpene Index is one of the important evidence for the differentiation of tea tree resources,Terpene analysis showed that Qiancha 1had a higher terpene index,which means Camellia sinensis cv.Meitan-taicha was more original tea resources.