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Electrochemical Characterization of Tea-derived Dissolved Organic Matter: Implications for Electron Shuttling

文献类型： 外文期刊

作者： Yuan, Yong 1 ; Tao, Ya 1 ; Zhou, Shungui 1 ; Lu, Qin 1 ; Tang, Hao 3 ;

作者机构： 1.Guangdong Inst Ecoenvironm & Soil Sci, Guangzhou 510650, Guangdong, Peoples R China

2.Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China

3.Guangdong Acad Agr Sci, Tea Res Inst, Guangzhou, Guangdong, Peoples R China

关键词： Electron transfer capacity;Tea leaf-derived dissolved organic matter;Fe(III) reduction;Electron shuttling

期刊名称：INTERNATIONAL JOURNAL OF ELECTROCHEMICAL SCIENCE （ 影响因子：1.765； 五年影响因子：1.685 ）

ISSN： 1452-3981

年卷期： 2013 年 8 卷 2 期

页码：

收录情况： SCI

摘要： Dissolved organic matter (DOM) is capable of taking part in biogeochemical electron transfer reactions due to its ability to facilitate redox reactions. Tea infusions are rich in DOM that show benefit impact on human health. In this study, electron transfer capacities (ETC) of tea-derived DOM (TDOM) were characterized with respect to the extent of fermentation. It appeared that the DOM originated from non-fermented and partially fermented tea had higher ETC values than those of fully fermentated tea. The electron acceptor capacity (EAC) values were ranged from 257 similar to 428 mu mol(e-) (g.C)(-1) and the EDC values were in the range of 17 similar to 38 mu mol(e-) (g.C)(-1) in the order: oolong tea > green tea > black tea > pu-erh. The electrochemical features of TDOM were proven to be correlated with its chemical structures. Element analysis, fourier-transform infrared (FTIR) and three-dimensional excitation/emission matrix fluorescence spectroscopy (3DEEM) revealed the abundance of aromatic and phenolic compounds in four tea samples, but their components differed in response to the manufacturing process. The fluorescence intensities of a peak at 370 similar to 390/460 similar to 470 nM (excitation (Ex)/emission (Em)) varied in the same trend as the ETC of all TDOM. Meanwhile, the same trend appeared in the TDOM -stimulated microbial reduction of iron(III) oxide, in which the TDOM acted as the electron shuttles to transfer electrons from the Fe(III)-reducing bacteria to the iron oxide. The results of the work provided potential biogeochemical implication of TDOM in natural environmental, which was the additional function of tea organic matters apart from benefiting human health.

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