中文摘要：

从云南省双江县勐库产的普洱茶中分离得到11个化合物，分别为：（-）-没食子儿茶索（GC，1），（-）-表儿茶素（EC，2），（＋）-儿茶素（C，3），杨梅素（4），没食子酸（5），山奈酚（6），山奈酚-3-O-B-D-葡萄糖甙（7），山奈酚-3-O-P丁糖甙（8），槲皮素（9），槲皮素-3-O-B-D葡萄糖甙（10）以及2，5-二羟基苯甲酸（11）。其中，化合物6-11为首次从普洱茶中分离得到。DPPH自由基清除活性测试结果表明，化合物2、3、5的活性与阳性对照品抗坏血酸接近。化合物的结构与其活性的关系比较分析表明，简单儿茶素（2，3）和简单酚类化合物（5）的抗氧化活性较高，与阳性对照品抗坏血酸接近；黄酮类化合物（4，6，9）次之，黄酮类配糖体（7，8，10）及化合物11则较差。

英文摘要：

Eleven phenolic compounds were isolated from the Pu＇er tea, which was produced in the post-fermentated process by using the crude green tea prepared from the leaves of Camellia sinensis var. assamica as raw materials. Their structures were identified as gallocatechin（1）, （-）-epicatechin（2）, （＋）-catechin（3）, myricetin（4）, gallic acid（5）, kaempferol（6）, kaempferol-3-O-B-D- glucopyranoside（7）, kaempferol-3-O-rutinoside（8）, quercetin（9）, quercetin-3-O-B-D-glucopyranoside（10）, 2,5-dihydroxy-benzoic acid（11）. This is the first time that compounds 6-11 were found from Pu＇er tea. All of isolated compounds were tested for their antioxidative activities by DPPH radical scavenging assay. It was found that compounds 2, 3 and 5 showed antioxidative activity close with that of positive control, L-ascorbic acid, and the flavonoids（5, 6 and 9） are more active than the flavonoid glycosides（7, 8 and 10）and compound 11.