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

• Published in: Journal of agricultural and food chemistry Vol. 60; no. 49; pp. 12170 - 12176
• Main Authors: Zhu, Li-Fang, Xu, Min, Zhu, Hong-Tao, Wang, Dong, Yang, Shi-Xiong, Yang, Chong-Ren, Zhang, Ying-Jun
• Format: Journal Article
• Language: English
• Published: WASHINGTON American Chemical Society 12.12.2012; Amer Chemical Soc
• Subjects: Agriculture; Agriculture, Multidisciplinary; antioxidant activity; Antioxidants - pharmacology; Beverages; Biological and medical sciences; caffeine; Camellia - chemistry; Camellia taliensis; chemical composition; Chemistry; Chemistry, Applied; China; Chromatography, High Pressure Liquid - methods; Coffee, tea and other stimulative beverage industries; Dimerization; flavanols; Flavonoids - chemistry; flavonols; Flavonols - analysis; Food industries; Food Science & Technology; Free Radical Scavengers - chemistry; Free Radical Scavengers - isolation & purification; Free Radical Scavengers - pharmacology; Fundamental and applied biological sciences. Psychology; glycosides; green tea; high performance liquid chromatography; indigenous species; leaves; Life Sciences & Biomedicine; Molecular Structure; mountains; Physical Sciences; Science & Technology; spectroscopy; tannins; Tannins - analysis; tea (beverage); trees; Myanmar; China; Asia; talienbisflavan A; antioxidant activities; DPPH; HPLC analysis; green tea; ABTS; Camellia taliensis; HYDROLYZABLE TANNINS; PROANTHOCYANIDINS; PHENOLIC ANTIOXIDANTS; LEAVES; FLAVONOIDS; POLYPHENOLS; ABTS(+); Flavanol; HPLC chromatography; Antioxidant; Flavonoid; Polyphenol; Mountain; Dimer; Green tea
• ISSN: 0021-8561; 1520-5118
• DOI: 10.1021/jf302726t

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 (2–6), five flavonols and flavonol glycosides (9–13), three flavan-3-ols (14–16), nine simple phenolic compounds and glycosides (7, 8, and 17–23), 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.