云南双江4个山头晒青茶品质比较分析

Comparative quality analysis of sun-dried tea from 4 hills in Shuangjiang, Yunnan

中文关键词:  云南双江  晒青茶  感官品质  内含成分  感官品质

英文关键词:Yunnan Shuangjiang  sun-dried tea  sensory quality  intrinsic composition  sensory quality

中文摘要:

      目的 探究云南双江4个山头(冰岛、小户赛、坝糯、荒山)春、夏、秋季晒青茶品质特征差异。方法 利用高效液相色谱法(high performance liquid chromatography, HPLC)测定儿茶素含量, 茚三酮比色法测定氨基酸含量, 紫外分光光度法测定咖啡碱含量等, 并结合感官评价对4个山头茶叶品质差异进行比较分析。结果 4个山头同一季节、同一山头不同季节茶叶品质差异显著。冰岛三季的总儿茶素含量整体较高, 其中春茶儿茶素总量最高, 为21.39 mg/g。荒山秋茶儿茶素总量含量最低, 为16.00 mg/g。冰岛三季水浸出物、茶多酚、氨基酸和咖啡碱整体都处于较高水平, 均值分别为44.97%、29.45%、3.57%和3.88%。内含成分差异使得不同的山头茶感官品质明显不同, 冰岛的晒青茶甜醇回甘; 小户赛的晒青茶浓强回甘; 坝糯的晒青茶浓厚强烈, 微涩; 荒山的晒青茶醇厚, 微涩。结论 冰岛是制作晒青茶的优质产区。除冰岛整体表现优异外, 其余3个山头的样品表现也较为优异, 说明双江县生产的晒青茶是加工普洱茶的优质原料。

英文摘要:

      Objective To investigate the differences in the quality characteristics of sun-dried tea in spring, summer and autumn from 4 hills in Shuangjiang, Yunnan (Bingdao, Xiaohusai, Banuo and Huangshan). Methods The content of catechin, amino acids and caffeine was determined by high performance liquid chromatography (HPLC), ninhydrin colorimetry, and ultraviolet spectrophotometry, respectively. Combined with sensory evaluation, the differences in tea quality between the 4 hills were compared and analyzed. Results Significant differences in the tea quality were found among the 4 hills in the same season and in different seasons on the same hill. The total catechin content of the 3 seasons in Bingdao was high overall, with the highest total catechin content of 21.39 mg/g in spring tea and the lowest total catechin content of 16.00 mg/g in autumn tea from the Huangshan. Water extracts, tea polyphenols, amino acids and caffeine were higher overall in all 3 seasons in Bingdao, with mean values of 44.97%, 29.45%, 3.57% and 3.88%, respectively. The differences in the inner components made the sensory quality of the different hilltop tea obviously different, with the sun-dried tea from Bingdao being sweet and mellow and sweet; the sun-dried tea from Xiaohusai being strong and sweet; the sun-dried tea from Banuo being strong and strong and slightly astringent; and the sun-dried tea from Bingdao being mellow and slightly astringent. Conclusion Bingdao is a high quality production area for sun-dried tea. In addition to the overall excellent performance of Bingdao, the samples from the other 3 hills also performs relatively well, indicating that the sun-dried tea produced in Shuangjiang County is a high-quality raw materials for processing Pu’er tea.