Effect of APTES modified TiO 2 on antioxidant enzymes activity secreted by Escherichia coli and Staphylococcus epidermidis

In this work, the impact of APTES-modified TiO photocatalysts on antioxidant enzymes (catalase and superoxide dismutase) activity secreted by bacteria was presented. Microbial tests has been examined using Escherichia coli (ATCC 29425) and Staphylococcus epidermidis (ATCC 49461) as model organisms. It was found that APTES-TiO affected the activity of antioxidant enzymes. Additionally, obtained APTES-TiO photocatalysts were capable of total E. coli and S. epidermidis inactivation under artificial solar light irradiation. The sample modified with the concentration of APTES equals 300 mM (TiO -4h-120°C-300mM) showed the strongest photocatalytic activity toward both bacteria species. The two-stage photocatalytic mechanism of bacteria response to photocatalysts was proposed.