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Tunable, bacterio-instructive scaffolds made from functional graphenic materials.

Karoline E Eckhart1, Anne M Arnold, Francesca A Starvaggi

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Functional graphenic materials (FGMs) can be engineered with specific surface charges to control bacterial adhesion. This study demonstrates tuning FGMs to selectively attract or repel bacteria, offering a new approach for biomaterial development.

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Area of Science:

  • Biomaterials Science
  • Surface Chemistry
  • Microbiology

Background:

  • Maintaining a balanced gut microbiome is crucial for health.
  • Antibiotic materials can disrupt beneficial bacteria, increasing pathogen risk.
  • Graphene oxide (GO)-based functional graphenic materials (FGMs) offer tunable antibacterial properties.

Purpose of the Study:

  • To investigate the influence of FGM surface charge on bacterial adhesion.
  • To develop FGMs that can selectively control bacterial populations without broad-spectrum killing.
  • To explore FGMs as bacterio-instructive scaffolds for maintaining health.

Main Methods:

  • Synthesized and characterized functional graphenic materials (FGMs) with varying surface charges.
  • Utilized electrostatic interactions to study bacterial adhesion.
  • Tested adhesion of Gram-negative (E. coli) and Gram-positive (B. subtilis) bacteria to charged FGMs.

Main Results:

  • Negatively charged FGMs (Claisen graphene) repelled E. coli via electrostatic repulsion.
  • Positively charged FGMs (PLL-conjugated CG) attracted E. coli, with adhesion modulated by PLL length.
  • Gram-positive B. subtilis showed limited, non-discriminatory adhesion to all FGMs.

Conclusions:

  • FGM surface charge is a key parameter for controlling bacterial adhesion.
  • Tuning FGM surface chemistry allows for selective bacterial interaction, avoiding non-specific killing.
  • Developed FGMs show potential as bacterio-instructive scaffolds for microbiome management.