Antibacterial activity of silver and titania nanoparticles on glass surfaces

Ruut Kummala, Kofi J Brobbey, Janne Haapanen, Jyrki M Mäkelä, Marianne Gunell, Erkki Eerola, Pentti Huovinen, Martti Toivakka and Jarkko J Saarinen

Abstract

A liquid flame spray (LFS) nanoparticle deposition process was used to generate glass surfaces with silver (Ag) and titania (TiO₂) nanoparticles for antibacterial activity against two common pathogenic bacteria causing community-associated and hospital-acquired infections, gram positive Staphylococcus aureus (S aureus) and gram negative Escherichia coli (E coli). All nanoparticle coatings increased antibacterial activity compared to a reference glass surface. The Ag nanoparticle coatings showed the highest antibacterial activity with E coli. On the contrary, TiO₂ nanoparticle coatings were found to have a higher antibacterial activity against S aureus than E coli. No significant differences in antibacterial activity were observed between the two used nanoparticle deposition amounts