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Humin as an electron donor for enhancement of multiple microbial reduction reactions with different redox potentials in a consortium.

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Title: Humin as an electron donor for enhancement of multiple microbial reduction reactions with different redox potentials in a consortium.
Authors: Zhang, Dongdong1, Zhang, Chunfang2,3, Xiao, Zhixing1, Suzuki, Daisuke2, Katayama, Arata1,2 a-katayama@esi.nagoya-u.ac.jp
Source: Journal of Bioscience & Bioengineering. Feb2015, Vol. 119 Issue 2, p188-194. 7p.
Subjects: Humins, Electron donors, Oxidation-reduction reaction, Biotransformation (Metabolism), Dechlorination (Chemistry), Pentachlorophenol
Abstract: A solid-phase humin, acting as an electron donor, was able to enhance multiple reductive biotransformations, including dechlorination of pentachlorophenol (PCP), dissimilatory reduction of amorphous Fe (III) oxide (FeOOH), and reduction of nitrate, in a consortium. Humin that was chemically reduced by NaBH 4 served as an electron donor for these microbial reducing reactions, with electron donating capacities of 0.013 mmol e − /g for PCP dechlorination, 0.15 mmol e − /g for iron reduction, and 0.30 mmol e − /g for nitrate reduction. Two pairs of oxidation and reduction peaks within the humin were detected by cyclic voltammetry analysis. 16S rRNA gene sequencing-based microbial community analysis of the consortium incubated with different terminal electron acceptors, suggested that Dehalobacter sp., Bacteroides sp., and Sulfurospirillum sp. were involved in the PCP dechlorination, dissimilatory iron reduction, and nitrate reduction, respectively. These findings suggested that humin functioned as a versatile redox mediator, donating electrons for multiple respiration reactions with different redox potentials. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
Description
Abstract:A solid-phase humin, acting as an electron donor, was able to enhance multiple reductive biotransformations, including dechlorination of pentachlorophenol (PCP), dissimilatory reduction of amorphous Fe (III) oxide (FeOOH), and reduction of nitrate, in a consortium. Humin that was chemically reduced by NaBH 4 served as an electron donor for these microbial reducing reactions, with electron donating capacities of 0.013 mmol e − /g for PCP dechlorination, 0.15 mmol e − /g for iron reduction, and 0.30 mmol e − /g for nitrate reduction. Two pairs of oxidation and reduction peaks within the humin were detected by cyclic voltammetry analysis. 16S rRNA gene sequencing-based microbial community analysis of the consortium incubated with different terminal electron acceptors, suggested that Dehalobacter sp., Bacteroides sp., and Sulfurospirillum sp. were involved in the PCP dechlorination, dissimilatory iron reduction, and nitrate reduction, respectively. These findings suggested that humin functioned as a versatile redox mediator, donating electrons for multiple respiration reactions with different redox potentials. [ABSTRACT FROM AUTHOR]
ISSN:13891723
DOI:10.1016/j.jbiosc.2014.07.010