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Combination types between graphene oxide and substrate affect the antibacterial activity.

Jiajun Qiu1,2, Lu Liu1,3, Hongqin Zhu1

  • 1State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, 200050, China.

Bioactive Materials
|July 11, 2018
PubMed
Summary

The attachment method of graphene oxide (GO) to titanium surfaces significantly impacts its antibacterial properties. Electrophoretic deposition (GO-EPD) demonstrated superior efficacy in preventing Staphylococcus aureus aggregation and generating reactive oxygen species (ROS).

Keywords:
AntibacterialCombination typeGraphene oxideS. aureusTitanium

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Biomedical Engineering

Background:

  • Graphene and its derivatives (GDs) possess excellent physicochemical properties, leading to extensive research.
  • The antibacterial activities of GDs are of growing interest, but their mechanisms remain debated.
  • GD antibacterial efficacy is influenced by factors like size, layers, oxygen groups, and environment.

Purpose of the Study:

  • To investigate how different combination types of graphene oxide (GO) with a titanium substrate affect its antibacterial activity.
  • To elucidate the relationship between GO-substrate interaction, bacterial aggregation, surface morphology, and reactive oxygen species (ROS) generation.

Main Methods:

  • Graphene oxide (GO) was immobilized onto titanium surfaces using three distinct methods: drop deposition (GO-D), electrostatic interaction (GO-APS), and electrophoretic deposition (GO-EPD).
  • In vitro antibacterial activity against Staphylococcus aureus (S. aureus) was systematically evaluated for each GO-substrate combination.
  • Analysis included bacterial aggregation, surface morphology (wrinkles/edges), and reactive oxygen species (ROS) levels.

Main Results:

  • Combination types influenced GO's ability to prevent S. aureus aggregation, surface sharpness, and ROS generation.
  • GO demonstrated enhanced antibacterial action when S. aureus was separated (non-aggregated), facilitated by sharp features and high ROS.
  • GO-EPD exhibited superior performance in preventing bacterial aggregation, possessing sharper features, and generating higher ROS levels compared to GO-APS and GO-D.

Conclusions:

  • The method of attaching GO to a substrate critically affects its antibacterial efficacy against S. aureus.
  • Electrophoretic deposition (GO-EPD) provides optimal antibacterial activity due to effective prevention of bacterial aggregation and enhanced ROS production.
  • Findings suggest that tailored surface functionalization strategies can significantly enhance the antimicrobial potential of graphene-based materials.