贵州绿茶中咖啡碱和儿茶素含量分析

Contents of Caffeine and Catechin in Guizhou Green Tea

对贵州省243份绿茶样品中咖啡碱和儿茶素类物质采用高效液相色谱方法进行检测。结果表明:贵州省绿茶中儿茶素含量范围为9.14%～27.28%,平均含量15.71%;咖啡碱含量为1.08%～3.33%,平均含量2.24%。各地区茶叶儿茶素品质指数多数为1000～2000,其中黔南地区的最高为1975.51;各地区的儿茶素苦涩味指数主要在8.00～17.04之间,黔西南地区的苦涩味指数最低为8.00。据此分析可得,贵州绿茶具有很高的利用价值,春茶适合开发高品质的名优茶,秋茶适合用于茶叶深加工或有效成分的提取。

Contents of caffeine and catechin of 243 green tea samples from Guizhou province are detected,using high performance liquid chromatographic（HPLC）.The results show that,the catechin contents range 9.14%～27.28% in green tea of Guizhou province,the average content is 15.71%.The caffeine contents range 1.08%～3.33%,the average content is 2.24%.The catechin quality indexes of samples from 9 regions mainly are 1 000～2 000,and the highest one（the sample is from Qiannan） is 1 975.51.The catechin bitter taste index of samples from 9 regions mainly are 8.00～17.04.According to the results,there is high value for making use of effective components of Guizhou green tea,and developing high quality spring tea is strongly recommended,and relatively the autumn tea is suitable for deep processing or extracting active principles.