Antioxidative Flavan-3-ol Dimers from the Leaves of Camellia fangchengensis

Camellia fangchengensis Liang et Zhong, belonging to the genus Camellia sect. Thea (Theaceae), is an endemic tea species to the south and southwest areas of Guangxi province, People’s Republic of China. Known as a wild tea plant, the leaves have been used for producing green tea or black tea by the...

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Published inJournal of agricultural and food chemistry Vol. 66; no. 1; pp. 247 - 254
Main Authors Meng, Xiu-Hua, Liu, Chang, Fan, Rong, Zhu, Li-Fang, Yang, Shi-Xiong, Zhu, Hong-Tao, Wang, Dong, Yang, Chong-Ren, Zhang, Ying-Jun
Format Journal Article
LanguageEnglish
Published WASHINGTON American Chemical Society 10.01.2018
Amer Chemical Soc
Subjects
Agriculture
Agriculture, Multidisciplinary
Chemistry
Chemistry, Applied
Food Science & Technology
Life Sciences & Biomedicine
Physical Sciences
Science & Technology
LC-MS
fangchengbisflavans A and B
Camellia fangchengensis
antioxidant activity
flavan-3-ol dimers
HPLC
Theaceae
APPLE
PHENOLIC ANTIOXIDANTS
TANNINS
FLAVONOIDS
CATECHINS
GREEN TEA
POLYPHENOLS
PLANT PROANTHOCYANIDINS
PROCYANIDINS
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Summary:Camellia fangchengensis Liang et Zhong, belonging to the genus Camellia sect. Thea (Theaceae), is an endemic tea species to the south and southwest areas of Guangxi province, People’s Republic of China. Known as a wild tea plant, the leaves have been used for producing green tea or black tea by the local people of its growing area. HPLC and LC-MS analysis showed the leaves contain oligomeric catechins as major phenolic components. Further detailed phytochemical study led to the identification of five flavan-3-ol dimers (1–5) including two new ones, fangchengbisflavans A (1) and B (2) from the leaves of C. fangchengensis, together with six known monomers (6–11) and one glucoside (12), in addition to gallic acid (13). Their structures were determined by extensive spectroscopic analysis. Most of the isolates displayed significant antioxidant activities in 1,1-diphenyl-2-picrylhydrazyl (DPPH) and 2,2′-azinobis­(3-ethylbenzothiazoline-6-sulfonic acid) (ABTS+) radical scavenging assays. The results suggested that the leaves of C. fangchengensis, rich in flavan-3-ol oligomers and monomers as potent antioxidants, could be a valuable plant resource for the production of tea and natural beverages.
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ISSN:0021-8561
1520-5118
DOI:10.1021/acs.jafc.7b04572