New Flavan-3-ol Dimer from Green Tea Produced from Camellia taliensis in the Ai-Lao Mountains of Southwest China

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• 作者：Li-Fang Zhu ; Min Xu ; Hong-Tao Zhu ; Dong Wang ; Shi-Xiong Yang ; Chong-Ren Yang ; Ying-Jun Zhang
• 刊名：Journal of Agricultural and Food Chemistry
• 出版年：2012
• 出版时间：December 12, 2012
• 年：2012
• 卷：60
• 期：49
• 页码：12170-12176
• 全文大小：281K
• 年卷期：v.60,no.49(December 12, 2012)
• ISSN：1520-5118

文摘

Camellia taliensis (W. W. Smith) Melchior, belonging to the genus Camellia sect. Thea (Theaceae), is an endemic species distributed from the west and southwest of Yunnan province, China, to the north of Myanmar. Known as a wild tea tree, its leaves have been used commonly for producing tea beverages by the local people of its growing area. One new flavan-3-ol dimer, talienbisflavan A (1), was isolated from green tea prepared from the leaves of C. taliensis collected from the east side of the Ai-Lao mountains, Yuanjiang county of Yunnan province, China. In addition, five hydrolyzable tannins (2鈥?b>6), five flavonols and flavonol glycosides (9鈥?b>13), three flavan-3-ols (14鈥?b>16), nine simple phenolic compounds and glycosides (7, 8, and 17鈥?b>23), and caffeine (24) were identified. Their structures were determined by detailed spectroscopic analysis. All of the isolated phenolic compounds were tested for their antioxidant activities by DPPH and ABTS⁺ radical scavenging assays. The contents of its main chemical compositions were also compared with those collected from the Lincang area of Yunnan province by high-performance liquid chromatography analysis.

Keywords:

Camellia taliensis; green tea; talienbisflavan A; antioxidant activities; DPPH; ABTS⁺; HPLC analysis