铁观音茶香气的气质联用分析

Aroma Analysis of Tieguanyin Tea by Gas Chromatography/Mass Spectrometry

福建安溪铁观音茶是一种具有特殊香气的乌龙茶,为了分析茶叶中的香气成分,采用研磨法和水蒸馏法两种方法,对茶叶的香气和氨基酸进行检测。研磨法检测到的主要香气成分为二甲基硫醚、丁醛、乙酸乙酯、丁二醛和环丁烯;而蒸馏法检测到的香气成分为苯乙醛、苯乙醇、苄基腈、香叶醇、吲哚、环戊烯、丁酸苯乙酯、橙花叔醇、茉莉酮酸甲酯、2,2'-二氨基吡啶、苯二甲酸、环戊二烯乙酸、茉莉酸甲酯、邻苯二甲酸二丁酯和叶绿醇。铁观音茶样品中含有16种氨基酸,其中谷氨酸为0.051mg·mL^(-1),亮氨酸为0.048mg·mL^(-1),最低的半胱氨酸为0.006 mg·mL^(-1)。本研究结果对新一代铁观音茶的品质改良和生产具有一定的指导意义。

Fujian Anxi Tieguanyin Tea is a kind of Oolong Tea with special aroma.To analysis the aroma compounds,two sample preparation methods of tea grinding and water distillation were carried out,then the tea aromas and amino acids were detected.The main aroma compounds were of dimethyl sulfide,butanal,ethyl acetate,butanedial and cyclobutene by the grinding method,as for the distillation method,the aroma compounds detected were of benzeneacetaldehyde,phenylethyl alcohol,benzyl nitrile,Geraniol,indole,cyclopentene,phenylethyl butyrate,nerolidol,methyl jasmonate,2,2’-dipyridylamine,benzenedicarboxylic acid,cyclopentaneacetic acid,methyl jasmonate ester,dibutyl phthalate and phytol.Tieguanyin Tea samples had16kind amino acids,in which glutamic acid and leucine were of0.051and0.048mg/mL,respectively,and the minimum one wes of cysteine in concentration of0.006mg/mL.The results will be helpful in the quality improvement and production of the new Tieguanyin tea.