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An insoluble iron complex coated cathode enhances direct electron uptake by Rhodopseudomonas palustris TIE-1

Publication date:

August 2018

Source:Bioelectrochemistry, Volume 122

Author(s): Karthikeyan Rengasamy, Tahina Ranaivoarisoa, Rajesh Singh, Arpita Bose

Microbial electrosynthesis (MES) is a promising bioelectrochemical approach to produce biochemicals. A previous study showed that Rhodopseudomonas palustris TIE-1 can directly use poised electrodes as electron donors for photoautotrophic growth at cathodic potentials that avoid electrolytic H2 production (photoelectroautotrophy). To make TIE-1 an effective biocatalyst for MES, we need to improve its electron uptake ability and growth under photoelectroautotrophic conditions. Because TIE-1 interacts with various forms of iron while using it as a source of electrons for photoautotrophy (photoferroautotrophy), we tested the ability of iron-based redox mediators to enhance direct electron uptake. Our data show that soluble iron cannot act as a redox mediator for electron uptake by TIE-1 from a cathode poised at +100mV vs. Standard Hydrogen electrode. We then tested whether an immobilized iron-based redox mediator Prussian blue (PB) can enhance electron uptake by TIE-1. Chronoamperometry indicates that cathodic current uptake by TIE-1 increased from 1.47±0.04 to 5.6±0.09μA/cm2 (3.8 times). Overall, our data show that immobilized PB can enhance direct electron uptake by TIE-1.
Graphical abstract

Authors:   Author(s): Karthikeyan Rengasamy, Tahina Ranaivoarisoa, Rajesh Singh, Arpita Bose
Journal:   Bioelectrochemistry
Volume:   122
Year:   2018
Pages:   164
DOI:   10.1016/j.bioelechem.2018.03.015
Publication date:   15-Apr-2018
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  • biochemicals
  • BioCatalyst
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