保靖黄金茶香气成分分析

GC–MS analysis on Aroma compounds of Baojing Huangjin tea

采用同时蒸馏萃取(SDE)法富集香气,以葵酸乙酯为内标,采用气–质(GC/MS)联用分析法,分析保靖黄金茶的香气成分。共得到61个组分,其中,主要是醇类和酯类,而高沸点香气物质不多,3–甲氧基–1,2–丙二醇(含量155.25mL/L)、芳樟醇(含量86.00mL/L)、3,7–二甲基–1,5,7–辛三烯–3–醇(含量76.50mL/L)、τ–杜松醇(含量93.00mL/L)、α–杜松醇(含量86.00mL/L)5个组分的含量较高,比内标高50.00mL/L;比较了黄金茶与福鼎大白茶香气成分的差异,黄金茶中含有α,α,4–三甲基苯甲醇、蒎烯、蛇床–6–烯–4–醇3种独特香气成分,主要香气物τ–杜松醇、α–杜松醇的含量比福鼎大白茶高;不同方法加工的黄金茶的香气成分差异大,烘、炒结合比直接烘干黄金茶的香气成分丰富,多检出30个香气成分,蛇床–6–烯–4–醇只在直接烘干黄金茶香精油中被检测到。

The aroma compounds of Baojing Huangjin tea were analyzed by GC/MS, resulting in 61 components. Among then five components had relatively high content （relative content exceeds internal standard 50.00 mL/L） including 1,2-Propanediol, 3-methoxy-（155.25 mL/L）, 1,6-Octadien-3-ol, 3,7-limethyl-（86.00 mL/L）, 1,5,7-Octatrien-3-ol, 3,7- dimethyl-（76.50 mL/L）, tau.-Cadinol（93.00 mL/L） and alpha.-Cadinol（86.00 mL/L）. Aroma compositions of Baojing Huangjin tea and Fudingdabai tea were compared which indicated benzenemethanol, .alpha,alpha, 4-trimethyl-, Copaene and Selina-6-en-4-ol are unique aroma compositions of Baojing Huangjin tea. The content of the main fragrance alpha.-Cadinol and tau.-Cadinol of Baojing Huangjin tea were higher than that of Fudingdabai tea. There were significant differences in aroma compounds between two samples of tea processed by different processing methods, and 30 more aroma compositions were detected in Baojing Huangjin tea processed by baked fry.