Humin as an electron mediator for microbial reductive dehalogenation

Environmental Science & Technology
Chunfang Zhang, Arata Katayama

Abstract

We report that humins extracted as the solid fractions from paddy soils or sediment are involved in extracellular electron transfer, coupled with microbial reductive dehalogenation of pentachlorophenol (PCP), by serving as both electron acceptor and electron donor. In our system, humin is requisite for the dechlorination of PCP, and this activity cannot be maintained when humin is replaced with soluble humic substances or related compounds, including 0.1 M NaOH-extracted humic acid from soil, Aldrich humic acid, and anthraquinone-2,6-disulfonate. The function of humins is stable against treatments with H(2)O(2) (30%, 30 min), HCl (0.1 M, 48 h), NH(2)OH · HCl (0.1 M, 48 h), NaBH(4) (0.1 M, 15 h), and heat (121 °C, 30 min). Cyclic voltammograms indicated that humin harbors redox-active moieties, and electron spin resonance suggested that quinone moieties within humin are the redox-active centers. Fourier-transform infrared and nuclear magnetic resonance analyses verified the presence of the aryl carbonyl carbon group in humin. Although the proportion of redox-active carbon is very small, the potential electron-mediating ability is not negligible. The finding that humin, in solid form, is redox active has important implications fo...Continue Reading

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Citations

Nov 14, 2013·Applied Microbiology and Biotechnology·Claudia M MartinezFrancisco J Cervantes
Feb 26, 2016·Journal of Bioscience and Bioengineering·Zhixing XiaoArata Katayama
Jan 9, 2019·Environmental Science and Pollution Research International·Dongyang LiZhifei Ma
Jan 4, 2019·Environmental Science and Pollution Research International·Hongling ChenDefeng Xing
Aug 14, 2019·International Journal of Environmental Research and Public Health·Mahasweta LaskarArata Katayama
Dec 20, 2018·International Journal of Environmental Research and Public Health·Duyen Minh Pham, Arata Katayama
Jun 18, 2020·International Journal of Environmental Research and Public Health·Mahasweta LaskarArata Katayama
Jan 5, 2021·Bulletin of Environmental Contamination and Toxicology·Cuiying LiuXiaosan Luo
Jul 23, 2019·Environmental Pollution·Xiao XiaoChao Yang
Nov 4, 2020·Chemosphere·Duyen Minh PhamArata Katayama
Jul 18, 2021·Environmental Geochemistry and Health·Jerzy WeberMaria Jerzykiewicz
Apr 25, 2014·Environmental Science & Technology·Chunfang ZhangArata Katayama
Apr 4, 2019·Environmental Science & Technology·Jiangtao QiaoMin Hu
Apr 23, 2014·Environmental Science & Technology·Laura KlüpfelMichael Sander
Jun 27, 2019·Environmental Science & Technology·Jialin ChiChristine V Putnis

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