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Humin as an Electron Mediator for Microbial Reductive Dehalogenation.

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Title: Humin as an Electron Mediator for Microbial Reductive Dehalogenation.
Authors: Chunfang Zhang1, Katayama, Arata2 katayama@esi.nagoya-u.ac.jp
Source: Environmental Science & Technology. 6/19/2012, Vol. 46 Issue 12, p6575-6583. 9p.
Subjects: Humins, Electron transport, Pentachlorophenol, Dehalogenation, Dechlorination (Chemistry), Humic acid, Electron paramagnetic resonance, Electron donor-acceptor complexes, Bacteria
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 H2O2 (30%, 30 min), HCl (0.1 M, 48 h), NH2OH·HCl (0.1 M, 48 h), NaBH4 (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 for in situ bioremediation, given the wide distribution of humin and the diversity and ubiquity of humic substance-utilizing microorganisms. [ABSTRACT FROM AUTHOR]
Copyright of Environmental Science & Technology is the property of American Chemical Society and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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  Data: Humin as an Electron Mediator for Microbial Reductive Dehalogenation.
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  Data: <searchLink fieldCode="AR" term="%22Chunfang+Zhang%22">Chunfang Zhang</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Katayama%2C+Arata%22">Katayama, Arata</searchLink><relatesTo>2</relatesTo><i> katayama@esi.nagoya-u.ac.jp</i>
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  Data: <searchLink fieldCode="JN" term="%22Environmental+Science+%26+Technology%22">Environmental Science & Technology</searchLink>. 6/19/2012, Vol. 46 Issue 12, p6575-6583. 9p.
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  Data: <searchLink fieldCode="DE" term="%22Humins%22">Humins</searchLink><br /><searchLink fieldCode="DE" term="%22Electron+transport%22">Electron transport</searchLink><br /><searchLink fieldCode="DE" term="%22Pentachlorophenol%22">Pentachlorophenol</searchLink><br /><searchLink fieldCode="DE" term="%22Dehalogenation%22">Dehalogenation</searchLink><br /><searchLink fieldCode="DE" term="%22Dechlorination+%28Chemistry%29%22">Dechlorination (Chemistry)</searchLink><br /><searchLink fieldCode="DE" term="%22Humic+acid%22">Humic acid</searchLink><br /><searchLink fieldCode="DE" term="%22Electron+paramagnetic+resonance%22">Electron paramagnetic resonance</searchLink><br /><searchLink fieldCode="DE" term="%22Electron+donor-acceptor+complexes%22">Electron donor-acceptor complexes</searchLink><br /><searchLink fieldCode="DE" term="%22Bacteria%22">Bacteria</searchLink>
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  Data: 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 H2O2 (30%, 30 min), HCl (0.1 M, 48 h), NH2OH·HCl (0.1 M, 48 h), NaBH4 (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 for in situ bioremediation, given the wide distribution of humin and the diversity and ubiquity of humic substance-utilizing microorganisms. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
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  Data: <i>Copyright of Environmental Science & Technology is the property of American Chemical Society and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1021/es3002025
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      – Code: eng
        Text: English
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        PageCount: 9
        StartPage: 6575
    Subjects:
      – SubjectFull: Humins
        Type: general
      – SubjectFull: Electron transport
        Type: general
      – SubjectFull: Pentachlorophenol
        Type: general
      – SubjectFull: Dehalogenation
        Type: general
      – SubjectFull: Dechlorination (Chemistry)
        Type: general
      – SubjectFull: Humic acid
        Type: general
      – SubjectFull: Electron paramagnetic resonance
        Type: general
      – SubjectFull: Electron donor-acceptor complexes
        Type: general
      – SubjectFull: Bacteria
        Type: general
    Titles:
      – TitleFull: Humin as an Electron Mediator for Microbial Reductive Dehalogenation.
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            NameFull: Chunfang Zhang
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            NameFull: Katayama, Arata
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              M: 06
              Text: 6/19/2012
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              Y: 2012
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