cytotoxicity and antibiotic application of green route surface modified ferromagnetic TiO nanoparticles.

The enormous numbers of applications of TiO nanoparticles (NPs) cause concern about their risk to the environment and human health. Consequently, motivated by the necessity of searching for new sources of TiO NPs of low cytotoxicity with antibacterial activity, we synthesized TiO NPs by a green route using a solution of titanium(iv) isopropoxide as a precursor and an aqueous extract of leaf as a reducing and surface modifying agent. We investigated their structure, shape, size, and magnetic properties, and evaluated their antibiotic application and cytotoxicity. The synthesized TiO NPs were applied against two Gram-negative bacteria ( and ) and two Gram-positive bacteria ( and ) to observe their antibacterial activity; and eventually clear zones of inhibition formed by the TiO NPs were obtained. Moreover, after exposing the synthesized TiO NPs to HeLa cells (carcinoma cells) and Vero cells (normal cells), no toxic effect was found up to a dose of 1000 mg L, indicating the safe use of the samples up to at least 1000 mg L. However, toxic effects on HeLa cells and Vero cells were observed at doses of 2000 mg L and 3000 mg L, respectively. These results indicate the safe use of leaf extract mediated synthesized TiO NPs in their potential applications.