Fig. 3.

ROS/RONS-scavenging activities of Pt–Se NPs. (A) Total anti-oxidation capability test of Pt, Se, and Pt–Se NPs. (B) DPPH radical-scavenging capacity of Pt, Se, and Pt–Se NPs, and color change of DPPH reagent after treatment with NPs. (C) ·OH-scavenging ability of Pt, Se, and Pt–Se at the same concentration, and ·OH-scavenging ability of Pt–Se at different concentrations; O₂^·− scavenging ability of Pt, Se, and Pt–Se NPs at the same concentration, and O₂^·− scavenging ability of Pt–Se at different concentrations. (D) Determination of the Pt–Se NPs with catalase-like activity. (E) ONOO⁻-scavenging activity of the Pt–Se NPs.