Figure 3. A) Macroscopic pictures of the resulting Gelatin NPs hydrogel composite (Gel-PDA-PAR30) compared to pure Gelatin hydrogel (Gel). B) Scanning Electron Microscopy images of the Gel-PDA-PAR30 hydrogel. C) Swelling properties of the Gel-PDA-PAR30 hydrogel compared to pure Gelatin hydrogel at different time point in PBS at 37°C (n=3 error bars correspond to standard deviations). D) Kinetic of PDA-PAR30-FITC NPs (non-diluted) release from Gelatin hydrogel at 37°C in PBS for 15 days. Fresh supernatant was added after each recording to perform cumulative release over time (n=3 error bars correspond to standard deviations).