초록
<P><B>Abstract</B></P> <P> <I>Sporomusa ovata</I> DSM-2662 produces high rate of acetate during microbial electrosynthesis (MES) by reducing CO<SUB>2</SUB> with electrons coming from a cathode. Here, we investigated other <I>Sporomusa</I> for MES with cathode potential set at −690mVvsSHE to establish if this capacity is conserved among this genus and to identify more performant strains. <I>S. ovata</I> DSM-2663 produced acetate 1.8-fold faster than <I>S. ovata</I> DSM-2662. On the contrary, <I>S. ovata</I> DSM-3300 was 2.7-fold slower whereas <I>Sporomusa aerivorans</I> had no MES activity. These results indicate that MES performance varies among <I>Sporomusa</I>. During MES, electron transfer from cathode to microbes often occurs <I>via</I> H<SUB>2</SUB>. To establish if efficient coupling between H<SUB>2</SUB> oxidation and CO<SUB>2</SUB> reduction may explain why specific acetogens are more productive MES catalysts, the metabolisms of the investigated <I>Sporomusa</I> were characterized under H<SUB>2</SUB>:CO<SUB>2</SUB>. Results suggest that other phenotypic traits besides the capacity to oxidize H<SUB>2</SUB> efficiently are involved.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Six <I>Sporomusa</I> species were evaluated for microbial electrosynthesis activity. </LI> <LI> <I>S. ovata</I> DSM-2663 was the best microbial catalyst for MES among the tested species. </LI> <LI> MES performance varies greatly among the six <I>Sporomusa</I> species. </LI> <LI> <I>Sporomusa</I> oxidizing H<SUB>2</SUB> efficiently are not necessarily good MES microbial catalysts. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>