Fig. 7. ROS overproduction induced by Se@β-CD-FA@PTX in MCF-7 cells. (A) Changes in intracellular ROS generation detected by measuring the DCF fluorescence intensity. (B) MCF-7 cells were incubated with 10 μM DCF-DA in PBS for 30 min and then treated with SeNPs, Se@β-CD-FA and Se@β-CD-FA@PTX. The asterisks over the bars indicate the statistical difference at the *p < 0.05 or **p < 0.01 level.