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Electrochemical Detection of Deuterium Kinetic Isotope Effect on Extracellular Electron Transport in Shewanella oneidensis MR-1
Published on: April 16, 2018
Reduction of ferric green rust by Shewanella putrefaciens
1Laboratoire de Chimie Physique et Microbiologie pour l'Environnement (LCPME), UMR 7564 CNRS-UHP, 405 rue de Vandoeuvre, Villers-lès-Nancy, France. jorand@pharma.uhp-nancy.fr
Letters in Applied Microbiology
|September 18, 2007
Summary
Iron-reducing bacteria transform ferric green rust (GR*) into its reduced form, green rust (GR). This bacterial activity demonstrates the reversibility of GR redox states and offers potential for environmental remediation.
Area of Science:
- Environmental Science
- Microbiology
- Geochemistry
Background:
- Green rusts (GRs) are mixed-valence Fe(II)-Fe(III) minerals with significant environmental relevance.
- Understanding the microbial transformation of GRs is crucial for biogeochemical cycling.
- Ferric green rust (GR*) is an oxidized form that requires reduction to its reactive state.
Purpose of the Study:
- To reduce carbonated ferric green rust (GR*) using an iron-respiring bacterium.
- To obtain the reduced homologue, mixed Fe(II)-Fe(III) carbonated green rust (GR).
- To investigate the role of bacterial respiration in GR redox state reversibility.
Main Methods:
- Chemical synthesis of GR* via GR oxidation.
- Incubation of GR* with Shewanella putrefaciens under controlled conditions.
- Utilization of sodium methanoate as the sole electron donor for bacterial respiration.
Main Results:
- GR* was rapidly transformed into GR by S. putrefaciens.
- An iron reduction rate of 8.7 mmol l(-1) h(-1) was achieved.
- Ferric green rust (GR*) was confirmed as an available electron acceptor for bacterial respiration.
Conclusions:
- Bacterial activity drives the reversibility of the green rust (GR) redox state.
- GRs can function as electronic balances in microbial environments.
- Potential applications include using iron-reducing bacteria to regenerate reactive GR for soil and water decontamination.
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