Antimicrobial characterization of silver nanoparticle-coated surfaces by "touch test" method

Area of Science:

• Materials Science
• Nanotechnology
• Microbiology

Background:

• Antimicrobial resistance (AMR) is a growing global health threat, particularly in healthcare settings.
• Preventing the transmission of resistant bacteria in hospitals is crucial for patient safety.
• While handwashing is effective, novel strategies like antimicrobial surfaces are needed.

Purpose of the Study:

• To develop and evaluate silver nanoparticle-coated surfaces for their antimicrobial properties.
• To assess the efficacy of these surfaces against common bacterial pathogens like Escherichia coli and Staphylococcus aureus.
• To explore the potential of these surfaces in preventing healthcare-associated infections.

Main Methods:

• Utilized direct and indirect liquid flame spray (LFS) to create silver nanoparticle coatings.
• Employed the "touch test" method to evaluate antimicrobial activity.
• Tested coated glass, polyethylene (PE), and PE terephthalate samples against E. coli and S. aureus.

Main Results:

• A single LFS coating cycle on glass inhibited E. coli growth; two cycles were needed for S. aureus.
• Coating PE and PE terephthalate required more cycles: three for E. coli and over 30 for S. aureus.
• The LFS method successfully produced nanostructured, large-area antibacterial surfaces.

Conclusions:

• Silver nanoparticle surfaces created via LFS exhibit significant antibacterial effects against clinical pathogens.
• These findings suggest potential applications for silver nanoparticle surfaces in hospital environments to reduce healthcare-associated infections.
• The effectiveness of the coatings varies depending on the substrate material and the number of coating cycles.