Figure 5

SEM imaging of ROS-responsive hollow spheres. 1 μm collagen-PPS hollow spheres before (A), and after (B) 72 hours exposure to H₂O₂ (B). Control: collagen-dithiolPEG hollow spheres before (C), and after (D) 72 hours exposure to H₂O_2. Inset: zoom views of the hollow spheres surface, prior to H₂O₂ exposure.