Study of Bacterial Sensitivity to Ag-TiO2 Nanoparticles

Abstract

Background: Silver has been widely used for disinfection because of its well known antibacterial properties. Recently, silver nanoparticles have shown higher activity killing and inhibiting bacterial reproduction. In the present work we obtained silver nanoparticles highly dispersed over nanostructured titania in order to enhance bacterial sensitivity.Materials and methods: Four different Titania-based nanoparticles were synthesized by the Sol-Gel process using Ag 2 SO 4 , AgCl, AgNO 3 and CH 3 COOAg as silver precursor. All the materials were characterized by FTIR, UV-Vis and XPS, TEM microscopy, EDS, also BET and DRX analysis were carried out.Results: Amorphous materials were apparently obtained. Ag-TiO 2 nanoparticles were tested against several Gramnegative and Gram-positive bacteria including enterophatogenic Escherichia coli and highly resistant strains such as methicillin-resistant Staphylococcus aureus and they showed sensibility in most of cases.Conclusions: Supported silver nanoparticles represent a suitable way to obtain highly dispersed active silver over higher surface area. This approach allows it use as efficient bactericide since lower silver amount can be employed. Journal of Nanomedicine & NanotechnologyJ o u rna l of N a n o m ed icine & N a n o te chnolo g y

Increasing the shelf life of pikeperch (Sander lucioperca) fillets affected by low-density polyethylene/Ag/TiO2 nanocomposites experimentally produced by sol-gel and melt-mixing methods

“…The efficacy of the melt-mixing method was better than the sol-gel method concerning the inactivation of E. coli, qualitatively similar to the results of Yu et al, [29] who reported an increasing diameter of the inhibition zone from 3 to 7 mm with increasing silver NP in the composite films. However, the present values of 4.60 ± .10 to 16.76 ± .10 mm for the melt-mixing method, and from 4.28 ± .05 to 12.64 ± .06 mm for the sol-gel method differed from the values reported by Lopez Goerne et al, [30] who described that NPs containing Ag/TiO 2 produced by the sol-gel process increased the zone of inhibition to approximately 10, 15.3, and 10.3 mm for E. coli, S. aureus and C. albicans, respectively. The values we obtained for S. aureus and C. albicans were different (18.45 ± 0.15 and 14.65 ± .07 in the melt-mixing method, respectively, and 15.41 ± .05 and 12.72 ± .09 in the sol-gel method).…”

Photocatalytic removal of methyl orange using Ag/Zn–TiO2 nanoparticles prepared by different methods

“…TiO 2 shows a peak around 0.5 keV, and another intense peak appears at 4.5 keV. The intense peak is assigned to TiO 2 in the bulk form, and the less intense peak is assigned to TiO 2 surface [19]. The existence of Ag + and Zn 2+ ions in the solid catalyst can be confirmed by these results.…”

Testing the antibacterial activity of doped TiO2 for preventing biodeterioration of cultural heritage building materials

“…Only using a ratio TiO 2 /binder ¼ 1/100, the colour alteration of surface due to AgeTiO 2 and SreTiO 2 is negligible. Titanium silver nanoparticles have demonstrated their antibacterial properties (Liu et al, 2008;Lopez Goerne et al, 2012).…”