Changes of major tea polyphenols and production of four new B-ring fission metabolites of catechins from post-fermented Jing-Wei Fu brick tea

被引:121
作者
Zhu, Yun-Fei [1 ]
Chen, Jing-Jing [1 ]
Ji, Xiao-Ming [2 ]
Hu, Xin
Ling, Tie-Jun [1 ]
Zhang, Zheng-Zhu [1 ]
Bao, Guan-Hu [1 ]
Wan, Xiao-Chun [1 ]
机构
[1] Anhui Agr Univ, Key Lab Tea Biochem & Biotechnol, Hefei 230036, Anhui, Peoples R China
[2] Shaanxi Zhong Fu Tea Res Inst, Xianyang City 712044, Shaanxi Provinc, Peoples R China
关键词
Fuzhuan brick tea (FBT); B-ring fission metabolites of catechins (BRFCs); Fuzhuanin C-F; Camellia sinensis; Eurotium spp; Aspergillus spp; CAMELLIA-SINENSIS; GREEN; EPIMERIZATION; FLAVAN-3-OLS; CONSTITUENTS; DEGRADATION; OXIDATION;
D O I
10.1016/j.foodchem.2014.08.075
中图分类号
O69 [应用化学];
学科分类号
081704 ;
摘要
HPLC analysis of samples from four major fermentation procedures of Jing-Wei Fu brick tea showed that the level of major tea catechins epigallocatechin gallate (EGCG) and epicatechin gallate (ECG) dropped increasingly to about 1/3 in the final product. Phytochemical study of the final product led to the discovery of four new B-ring fission metabolites of catechins (BRFCs) Fuzhuanin C-F (1-4) together with three known BRECs (5-7), six known catechins (8-13), five simple phenols (14-18), seven flavones and flavone glycosides (19-25), two alkaloids (26, 27), three triterpenoids (28-30) and one steroid (31). The structures were elucidated by spectroscopic methods including 1D and 2D NMR, LC-HR-ESI-MS, IR, and CD spectra. Five compounds (16-18,28, 29) were reported for the first time in tea. Possible pathways for the degradation of major tea catechins and the generation of BRFCs were also provided. (C) 2014 Elsevier Ltd. All rights reserved.
引用
收藏
页码:110 / 117
页数:8
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