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Publication MIO : Guillaume Pillot (MIO), Eléonore Frouin (MIO), Emilie Pasero (MIO), Anne Godfroy, Yannick Combet-Blanc (MIO), Sylvain Davidson (MIO), Pierre-Pol Liebgott (MIO) - Specific enrichment of hyperthermophilic electroactive Archaeafrom deep-sea hydrothermal vent on electrically conductive support in Bioresource Technology

Version imprimable de cet article

Received 8 January 2018, Revised 9 March 2018, Accepted 10 March 2018, Available online 14 March 2018


While more and more investigations are done to study hyperthermophilic exoelectrogenic communities from environments, none have been performed yet on deep-sea hydrothermal vent. Samples of black smoker chimney from Rainbow site on the Atlantic mid-oceanic ridge have been harvested for enriching exoelectrogens in microbial electrolysis cells under hyperthermophilic (80 °C) condition. Two enrichments were performed in a BioElectrochemical System specially designed : one from direct inoculation of crushed chimney and the other one from inoculation of a pre-cultivation on iron (III) oxide. In both experiments, a current production was observed from 2.4 A/m2 to 5.8 A/m2 with a set anode potential of -0.110 V vs Ag/AgCl. Taxonomic affiliation of the exoelectrogen communities obtained on the electrode exhibited a specific enrichment of Archaea belonging to Thermococcales and Archeoglobales orders, even when both inocula were dominated by Bacteria.

Graphical abstract

Hyperthermophilic exoelectrogens
Deep-sea hydrothermal vent
Microbial electrolysis cell
External Electron Transfer

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