Fig. 8
Evaluation of the cytotoxicity of biogenic titanium nanoparticles. A MTT assay of NPTiOIV-NS in concentrations between 0.06 and 2.1 × 109 NPs mL−1 with different cell lines with (UV +) and without (UV− ) exposure to ultraviolet radiation. B Direct viability analysis of cells exposed to NPTiOIV-NS at the concentrations 1 × 109 and 1 × 108 NPs mL−1 with (UV +) and without (UV− ) exposure to ultraviolet radiation by the exclusion of trypan blue dye. *Indicates difference when compared to the control; a and b indicate comparisons between the assays without and with exposure to UVC radiation, respectively (p < 0.05)