DescriptionElectrochemical Catalysis of Inorganic Complex K4[Fe(CN)6] by Shewanellaoneidensis MR-1
The interaction between metal and bacteria is a universal and important biogeochemical process in environment. As a dissimilatory metal reduction bacteria, the electrochemical active bacteria Shewanella oneidensis MR-1 can transfer intracellular electrons to minerals1. This ability is attributed to the redox proteins localized to the outer-membrane, for example, the MtrC, MtrB,
MtrA and CymA2. Here we investigate its electrochemical properties towards redox inorganic redox compounds. It shows strong electrocatalysis toward electrochemical oxidation of K4[Fe(CN)6]. As a redox molecule, K4[Fe(CN)6] gives a pair of redox peaks on voltammetry on bare glassy carbon electrode (GCE), symmetric with ideal peak-peak separation of about 60 mV, indicating of
a reversible one-electron transfer process (blue curve, Figure 1). Surprisingly, the presence of Shewanella oneidensis MR-1 on GCE results an asymmetric redox peak, with almost disappearance of the cathodic peak and strengthen of the anodic peak, which is a typical catalysis feature of electrochemical oxidation.
Further experiments show that Shewanella oneidensis MR-1 does not give such electrocatalysis to redox compounds such as Ru[(NH3)6]Cl3 and Resorufin. Systematic study on the selectivity and electrocatalysis mechanisms of Shewanella oneidensis MR-1 are under investigation. The ability of Shewanella oneidensis MR-1 to catalyze redox action of inorganic metal complex compounds will provide an insight on metal cycles in nature
|Period||2 Jul 2017 → 5 Jul 2017|