Figure 3.

H2O2 and hydroxyl radical levels of murine photoreceptor cells before and after exposure to different concentrations of ZnO NPs for 4 h. (a) The alterations in H2O2 levels of murine photoreceptor cells treated with different concentrations of ZnO NPs; (b) the alterations in hydroxyl radical levels of murine photoreceptor cells treated with different concentrations of ZnO NPs. Significant difference was observed for both H2O2 levels and hydroxyl radical levels compared to those in untreated cells respectively. *P < 0.05 versus relevant control samples, and NPs = nanoparticles.