Comparative antibacterial activity of 2D materials coated on porous-titania

J Mater Chem B. 2021 Aug 28;9(32):6412-6424. doi: 10.1039/d1tb01122g. Epub 2021 Jul 29.

Abstract

Plasma electrolytic oxidation (PEO) is a well-established technique for the treatment of titanium-based materials. The formed titania-PEO surface can improve the osseointegration properties of titanium implants. Nevertheless, it can not address bacterial infection problems associated with bone implants. Recently, 2-dimensional (2D) materials such as graphene oxide (GO), MXene, and hexagonal boron nitride (hBN) have received considerable attention for surface modifications showing their antibacterial properties. In this paper, a comparative study on the effect of partial deposition of these three materials over PEO titania substrates on the antibacterial efficiency and bioactivity is presented. Their partial deposition through drop-casting instead of continuous film coating is propsed to simultaneously address both antibacterial and osseointegration abilities. Our results demonstrate the dose-dependent nature of the deposited antibacterial agent on the PEO substrate. GO-PEO and MXene-PEO samples showed the highest antibacterial activity with 70 (±2) % and 97 (±0.5) % inactivation of S. aureus colonies in the low concentration group, respectively. Furthermore, only samples in the higher concentration group were effective against E. coli bacteria with 18 (±2) % and 17 (±4) % decrease in numbers of colonies for hBN-PEO and GO-PEO samples, respectively. Moreover, all antibacterial samples demonstrated acceptable bioactivity and good biocompatibility, making them a considerable candidates for the next generation of antibacterial titanium implants.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Anti-Bacterial Agents
  • Boron Compounds / chemistry
  • Boron Compounds / pharmacology*
  • Coated Materials, Biocompatible / chemistry
  • Coated Materials, Biocompatible / pharmacology*
  • Escherichia coli / drug effects
  • Graphite / chemistry
  • Graphite / pharmacology*
  • Osseointegration
  • Prostheses and Implants
  • Staphylococcus aureus / drug effects
  • Surface Properties
  • Titanium

Substances

  • Anti-Bacterial Agents
  • Boron Compounds
  • Coated Materials, Biocompatible
  • graphene oxide
  • boron nitride
  • Graphite
  • Titanium