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Humin as an External Electron Mediator for Microbial Pentachlorophenol Dechlorination: Exploration of Redox Active Structures Influenced by Isolation Methods

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  • Duyen Minh Pham

    (Department of Civil Engineering, Graduate School of Engineering, Nagoya University, Nagoya 464-8603, Japan
    Institute of Materials and Systems for Sustainability, Nagoya University, Nagoya 464-8603, Japan)

  • Arata Katayama

    (Department of Civil Engineering, Graduate School of Engineering, Nagoya University, Nagoya 464-8603, Japan
    Institute of Materials and Systems for Sustainability, Nagoya University, Nagoya 464-8603, Japan)

Abstract

Humin (HM) has been reported to function as an external electron mediator (EEM) in various microbial reducing reactions. In this study, the effect of isolation methods on EEM functionality and the chemical/electrochemical structures of HM were examined based on the correlation between dechlorination rates in the anaerobic HM-dependent pentachlorophenol (PCP)-dechlorinating consortium and the chemical/electrochemical structures of HM. A lack of PCP dechlorination activity suggested no EEM function in the HM samples prepared as a soluble fraction in dimethyl sulfoxide and sulfuric acid (which did not contain any electric capacitance). Other HM samples exhibited EEM functionality as shown by the dechlorination activity ranging from 0.55 to 3.48 (µmol Cl − ) L −1 d −1 . The comparison of dechlorination activity with chemical structural characteristics suggested that HM with EEM functionalities had predominantly aliphatic and carbohydrate carbons with the partial structures C=O, O=C–N, and O=C–O. EEM functionality positively correlated with the proportion of O=C–N and O=C–O, suggesting an association between peptidoglycan structure and EEM functionality. The lack of detection of a quinone structure in one HM sample with EEM functionality and a negative correlation with aromatic or C=C carbon suggested that the mechanism containing quinone structures is a minor component for the functionality of EEM.

Suggested Citation

  • Duyen Minh Pham & Arata Katayama, 2018. "Humin as an External Electron Mediator for Microbial Pentachlorophenol Dechlorination: Exploration of Redox Active Structures Influenced by Isolation Methods," IJERPH, MDPI, vol. 15(12), pages 1-17, December.
    • Handle: RePEc:gam:jijerp:v:15:y:2018:i:12:p:2753-:d:188234
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    References listed on IDEAS

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    1. Johannes Lehmann & Markus Kleber, 2015. "The contentious nature of soil organic matter," Nature, Nature, vol. 528(7580), pages 60-68, December.
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    1. Tingting Hu & Duyen Minh Pham & Takuya Kasai & Arata Katayama, 2022. "The Emergence of Extracellular Electron Mediating Functionality in Rice Straw-Artificial Soil Mixture during Humification," IJERPH, MDPI, vol. 19(22), pages 1-18, November.

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