Fig. 1
From: A pH/enzyme dual responsive PMB spatiotemporal release hydrogel promoting chronic wound repair
Characterization of the basic properties of the hydrogels. a FTIR spectrum of SA, OSA, SSA and OSSA. b Macroscopic observation of OSSA/PMB-based hydrogel formation. c FT-IR spectra for freeze-dried GelMA, GelMA/OSA, GelMA/OSSA, GelMA/OSA/PMB and GelMA/OSSA/PMB hydrogels. d SEM images of the cross-section of GelMA, GelMA/OSA, GelMA/OSSA, GelMA/OSA/PMB, GelMA/OSSA/PMB. e Enlarged SEM images of d of GelMA, GelMA/OSA, GelMA/OSSA, GelMA/OSA/PMB, GelMA/OSSA/PMB. f SEM images of the Surface detail of GelMA, GelMA/OSA, GelMA/OSSA, GelMA/OSA/PMB, GelMA/OSSA/PMB