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Electrochemical checking of aerobic isolates from electrochemically active biofilms formed in compost

Parot, Sandrine and Nercessian, Olivier and Délia, Marie-Line and Achouak, Wafa and Bergel, Alain Electrochemical checking of aerobic isolates from electrochemically active biofilms formed in compost. (2009) Journal of Applied Microbiology, vol. 1 (n° 4). pp. 1350-1359. ISSN 1364-5072

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Official URL: http://dx.doi.org/10.1111/j.1365-2672.2008.04103.x

Abstract

Aims: To design a cyclic voltammetry (CV) procedure to check the electrochemical activity of bacterial isolates that may explain the electrochemical properties of biofilms formed in compost. Methods and Results: Bacteria catalysing acetate oxidation in garden compostwere able to form electrochemically active biofilms by transferring electrons to an electrode under chronoamperometry. They were recovered from the electrode surface and identification of the isolates using 16S rRNA sequencing showed that most of them were Gammaproteobacteria, mainly related to Enterobacter and Pseudomonas spp. A CV procedure was designed to check the electrochemical activity of both groups of isolates. Preliminary CVs suggested that the bacteria were not responsible for the catalysis of acetate oxidation. In contrast, both groups of isolates were found to catalyse the electrochemical reduction of oxygen under experimental conditions that favoured adsorption of the microbial cells on the electrode surface. Conclusions: Members of the genera Enterobacter and Pseudomonas were found to be able to catalyse the electrochemical reduction of oxygen. Significance and Impact of the Study: This study has shown the unexpected efficiency of Enterobacter and Pseudomonas spp. in catalysing the reduction of oxygen, suggesting a possible involvement of these species in biocorrosion, or possible application of these strains in designing bio-cathode for microbial fuel cells.

Item Type:Article
Additional Information:The definitive version is available at www.blackwell-synergy.com
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:Other partners > Université de la Méditerranée - Aix-Marseille II (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT
French research institutions > Commissariat à l'Energie Atomique et aux énergies alternatives - CEA
Université de Toulouse > Université Paul Sabatier-Toulouse III - UPS
French research institutions > Centre National de la Recherche Scientifique - CNRS
Laboratory name:
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Deposited By:Marie-line Delia

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