云南大叶茶新材料儿茶素组分含量季节变化分析

Seasonal Variation of Catechins Components Content of New Materials of Yunnan Large-leaf Tea

为进一步研究云南大叶种茶不同品种生化特性,以10个云南大叶茶新材料为研究对象,通过对不同季节(春、夏、秋)茶叶中儿茶素组分进行检测及对比,对不同品种间儿茶素组分含量进行分析,研究10份大叶茶新材料儿茶素组分的季节性变化规律。结果表明:茶叶中儿茶素各组分都呈现出一定的季节性变化规律,EC、EGC春、夏、秋茶的平均含量顺序为秋茶>夏茶>春茶,ECG平均含量顺序为秋茶=夏茶>春茶,EGCG平均含量顺序为夏茶>秋茶>春茶。除春茶材料5和8儿茶素组分间的变化规律为EGCG>EGC>ECG>EC,其他材料的变化趋势均为EGCG>ECG>EGC>EC;除夏茶中材料3儿茶素组分间的变化规律为EGCG>EGC>ECG>EC,以及材料6变化规律为EGCG>ECG=EGC>EC,其他材料的变化趋势均为EGCG>ECG>EGC>EC;秋茶中所有儿茶素组分的变化趋势均为EGCG>EGC>ECG>EC。10份大叶茶新材料三季EC、EGC、ECG、EGCG含量平均值变化范围为0.73%～1.83%、1.96%～4.96%、2.76%～3.22%、8.57%～9.57%,各组分含量间的总体变化趋势为EGCG>ECG>EGC>EC。三季儿茶素品质平均指数材料7最高,材料6最低;三季中,10种材料夏茶品质指数最高,其次是春茶、秋茶。总体来看,研究所选的10个云南大叶种新材料间,不同季节不同儿茶素组分含量都存在显著差异。

The study aims to analyze the catechins components of different tea varieties, and explore the seasonal change rule of catechins components of 10 new materials of Yunnan large-leaf tea. The resultsshowed that the components in tea catechins had a certain seasonal change law. The average content order ofEC and EGC in spring, summer and autumn was autumn tea>summer tea> spring tea, that of ECG was autumntea=summer tea>spring tea, and that of EGCG was summer tea>autumn tea>spring tea. In addition to thespring tea material 5 and 8(whose change rule of catechins components was EGCG> EGC> ECG> EC), thechange trend of other materials was EGCG> ECG> EGC> EC, in addition to the summer tea material 3(whose change rule was EGCG> EGC> ECG> EC), and material 6(whose change rule was EGCG> ECG=EGC> EC), the change trend of other materials was EGCG> ECG> EGC>EC, and the change trend of all theautumn tea materials was EGCG> EGC> ECG>EC. For the 10 materials of the three seasons, the variationrange of average content of EC, EGC, ECG and EGCG was 0.73%-1.83%, 1.96%-4.96%, 2.76%-3.22%, and8.57%-9.57%, respectively. The overall change trend of various components was EGCG> ECG> EGC> EC.The quality average index of catechins material 7 of the three seasons was the highest, and that of material 6 was the lowest. Of the three seasons, summer tea had the highest quality index, followed by spring tea and thenautumn tea. In general, among the 10 new materials of Yunnan large-leaf tea varieties selected, there is a significant difference in the content of catechins components among different seasons.