Fig. 2.

Fabrication, responsibility, degradation and ROS scavenging of the multifunctional hydrogel. a) Optical images of the formation of QCSFP hydrogel based on boronic ester bonds. b) Optical microscope image and particle size statistics of the DFO@G. c) SEM images of the DFO@G-QCSFP hydrogel. d) FTIR spectra of the CS, QCS, QCSF, and QCSFP hydrogel. e) Degradation profile of the DFO@G-QCSFP hydrogel in simulated diabetic wound microenvironment (16.6 mM glucose and 1 mM H₂O₂) at 37 °C. f) DFO released from DFO@G-QCSFP with addition of MMP-9. g) UV–vis absorbance spectra of the H₂O₂ solution incubated with DFO@G-QCSSFP hydrogel within different time intervals. h) The H₂O₂ scavenging experiment in solutions incubated without or with the hydrogel. i) UV–vis absorbance spectra of MB degradation with or without the hydrogel triggered by Fenton reaction induced by Fe²⁺ and H₂O₂.