Fig. 4. Intracellular redox production after incubation with ZnO NPs, CPP and VC in different systems for 24 h. (a) ROS generation; (b) MDA concentration; (c) GSH concentration; (d) SOD activity. Data are presented as the mean ± S.D. *P < 0.05 compared with the group of ZnO NPs plus CPP. **P < 0.01 compared with the group pf ZnO NPs plus CPP. #p < 0.05 compared with the group of ZnO NPs plus VC. ##p < 0.01 compared with the group of ZnO NPs plus VC.
