Polydopamine coating on individual cells for enhanced extracellular electron transfer

Area of Science:

• Electrochemistry
• Biotechnology
• Materials Science

Background:

• Extracellular electron transfer (EET) is crucial for microbial energy metabolism and bioelectrochemical systems.
• Efficient EET often requires mediators to facilitate electron exchange between cells and electrodes.
• Current methods for mediator immobilization can be complex or inefficient.

Purpose of the Study:

• To develop a novel strategy for redox mediator immobilization on live cells.
• To enhance extracellular electron transfer (EET) using polydopamine (PDA) coating.
• To create a synergistic effect between PDA and cell-secreted molecules for improved electron transport.

Main Methods:

• Coating individual live cells with polydopamine (PDA).
• Utilizing the inherent redox properties of PDA.
• Leveraging PDA's ability to adsorb self-secreted flavin molecules from cells.

Main Results:

• Successful immobilization of a redox mediator (PDA) on live cells.
• Achieved a synergistic effect between PDA and cell-secreted flavins.
• Established a double-mediator electron transport channel, significantly enhancing EET.

Conclusions:

• Coating live cells with PDA is an effective strategy for redox mediator immobilization.
• The developed method enhances EET through a synergistic double-mediator system.
• This approach offers a promising pathway for improving bioelectrochemical devices and microbial fuel cells.