Fig. 6

ROS scavenging property of hydrogels against Hydroxyl radicals and DPPH radicals. (A-I) UV − vis spectra of the DPPH reaction with different scaffolds after 120 min, (A-II) DPPH scavenging efficiency of the scaffolds; (B-I) The OH• scavenging activities of samples were demonstrated by the color change (1: blank, 2: control, 3: GO-PAM, 4: Hep₂₀-rGO-PAM, 5: PDA_0.8-rGO-PAM, 6: Hep₂₀-PDA_0.8-rGO-PAM group), (B-II) OH• scavenging efficiency of the scaffolds; (C-I) Growth conditions of S. aureus (a₁-d₁) and P. aeruginosa (a₂-d₂) on the blank culture substrate (a₁, a₂), Hep₂₀-PDA_0.2-rGO-PAM (b₁, b₂), Hep₂₀-PDA_0.4-rGO-PAM (c₁, c₂) and Hep₂₀-PDA_0.8-rGO-PAM (d₁, d₂) hydrogel; (C-II) Antibacterial rate calculated by log reduction of bacteria (CFU) on contact with the three hydrogels according to the spread plate results (n = 3)