Du-Zhong tea is a health beverage produced from Eucommia ulmoides leaves (EUL) as raw materials using traditional tea processing and Chinese herbal pieces processing methods. To evaluate the differences between tender leaves and mature leaves of Du-Zhong tea, UPLC-Q-TOF MS was used to analyze the constituents in EUL collected in April and August. A total of 52 compounds, including iridoids, phenylpropanoids, flavonoids, lignans, and other types of compounds were identified. The contents of nine ingredients in the tender and mature leaves of E. ulmoides were determined by HPLC-DAD analysis. The results show that the average contents of the compounds in tender leaves were significantly higher than those in mature leaves. Lastly, the antioxidant and antipancreatic lipase activities of commercial Du-Zhong tea made by leaves of different maturity were evaluated. Du-Zhong tea with D-grade exhibited relatively higher antioxidant, while C-grade exhibited greater lipase inhibitory activities.

杜仲茶是以杜仲叶（EUL）为原料，采用传统茶叶加工和中药饮片加工方法制成的保健饮料。为评价独中茶嫩叶与成熟叶的差异，采用UPLC-Q-TOF MS对4月和8月采集的EUL中的成分进行分析。共鉴定出 52 种化合物，包括环烯醚萜类、苯丙烷类、黄酮类、木脂素和其他类型的化合物。E. ulmoides嫩成熟叶中九种成分的含量通过HPLC-DAD分析确定。结果表明，嫩叶中化合物的平均含量显着高于成熟叶。最后，评价了由不同成熟度的叶子制成的商品杜仲茶的抗氧化和抗胰腺脂肪酶活性。D级杜仲茶的抗氧化能力相对较高，而C级的脂肪酶抑制活性较高。