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Quinone-Grafted Chitosan Polymers Enhance Microbial Extracellular Electron Transfer for Living Bioelectronic Devices.

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Researchers developed a novel redox-active hydrogel to improve electron transfer in bioelectronic devices using Gram-positive bacteria. This innovation enhances device functionality for sensing and power generation.

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Area of Science:

  • Bioelectronics
  • Microbial Electrochemistry
  • Biomaterials

Background:

  • Microbial bioelectronics leverage electroactive bacteria for sustainable sensing, power, and chemical production.
  • Gram-positive bacteria offer unique advantages over Gram-negative species but face challenges in extracellular electron transfer (EET) due to their cell walls.
  • Efficient EET is crucial for the performance of microbial bioelectronic devices.

Purpose of the Study:

  • To develop a method for enhancing extracellular electron transfer (EET) in Gram-positive bacteria for bioelectronic applications.
  • To create a living bioelectronic device using a redox-active polymer to encapsulate bacteria and improve EET.
  • To demonstrate the potential of this approach for sensing and other bioelectronic functions.

Main Methods:

  • Fabrication of a redox-active hydrogel (NQ-Chit) by grafting naphthoquinone redox groups onto a chitosan backbone.
  • Encapsulation of the Gram-positive bacterium Lactiplantibacillus plantarum within the NQ-Chit hydrogel matrix.
  • In situ ionic cross-linking of the hydrogel on an electrode surface to create living bioelectronic devices.

Main Results:

  • The NQ-Chit hydrogel significantly enhanced EET current compared to control groups (chitosan-only hydrogel and NQ-Chit coated electrodes).
  • Michaelis-Menten kinetics accurately described the relationship between quinone concentration and EET current.
  • The developed devices demonstrated sustained functionality through multiple medium exchanges and enhanced EET across various electroactive bacteria.

Conclusions:

  • Encapsulating electroactive bacteria within redox-active hydrogels is an effective strategy to overcome EET limitations in Gram-positive species.
  • The NQ-Chit hydrogel system provides a versatile platform for advancing microbial bioelectronic devices.
  • This approach shows promise for practical applications, including environmental chemical detection.