Figure 3.

ROS scavenging capacity of the Pt NPs. (A) Percentage of O₂^•− elimination by Pt NPs in various concentrations via the NBT method. (B) Dissolved oxygen production from H₂O₂ under different Pt NP concentrations. (C) CAT-like enzyme activity of Pt NPs (1.75 μg/mL) under varied H₂O₂ concentrations. (D) The Michaelis–Menten kinetics assay for the CAT-like enzyme activity of the Pt NPs (with 0.175 μg/mL Pt NPs and 0–0.144 M H₂O₂). (E) MB method determined the •OH scavenging ability of the Pt NPs (20 μg/mL). Inset: Images of different reaction systems. (F) TA method determined the •OH scavenging ability of the Pt NPs.