Zhou Zhi-Hong, Zhang Ying-Jun, Xu Min, Yang Chong-Ren
State Key Laboratory of Phytochemistry and Plant Resources of West China, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650204, People's Republic of China.
J Agric Food Chem. 2005 Nov 2;53(22):8614-7. doi: 10.1021/jf051390h.
Pu-er tea is a special treated fermented tea produced from crude green tea, which is prepared from the leaves of Camellia sinensis var. assamica. It is a traditional beverage having been used in China, particularly the southern areas, for a long time. Chemical investigation led to the identification of two new 8-C substituted flavan-3-ols, puerins A (1) and B (2), and two known cinchonain-type phenols, epicatechin-[7,8-bc]-4alpha-(4-hydroxyphenyl)-dihydro-2(3H)-pyranone (3) and cinchonain Ib (4), together with other seven known phenolic compounds, 2,2',6,6'-tetrahydroxydiphenyl (5), (-)-epicatechin-8-C-beta-d-glucopyranoside (6), (-)-epicatechin (EC) (7), (-)-epigallocatechin (EGC) (8), (+/-)-gallocatechin (GC) (9), gallic acid (10), and myricetin (11), in addition to caffeine (12). Their structures were determined by spectroscopic methods. The compounds 1-5, which might be formed in the postfermentative process of Pu-er tea, were isolated from tea and theaceous plants for the first time.
普洱茶是一种由粗绿茶经过特殊处理发酵而成的茶，粗绿茶由阿萨姆种茶树的叶子制成。它是一种在中国，尤其是南方地区长期使用的传统饮品。通过化学研究鉴定出两种新的8 - C取代黄烷 - 3 - 醇，普洱茶素A（1）和B（2），以及两种已知的金鸡纳宁型酚类化合物，表儿茶素 - [7,8 - bc] - 4α - （4 - 羟基苯基） - 二氢 - 2（3H） - 吡喃酮（3）和金鸡纳宁Ib（4），还有其他七种已知的酚类化合物，2,2'，6,6' - 四羟基二苯（5），（ - ） - 表儿茶素 - 8 - C - β - D - 吡喃葡萄糖苷（6），（ - ） - 表儿茶素（EC）（7），（ - ） - 表没食子儿茶素（EGC）（8），（±） - 没食子儿茶素（GC）（9），没食子酸（10）和杨梅素（11），此外还有咖啡因（12）。它们的结构通过光谱方法确定。化合物1 - 5可能是在普洱茶的后发酵过程中形成的，首次从茶叶和山茶科植物中分离得到。
