Adhesive properties of photo-cross-linkable MeHA/ELP hybrid hydrogels. (a) Schematic of the modified standard burst pressure test (ASTM F2392–04). Burst pressure resistance of (b) MeHA/ELP hydrogels produced by using different MeHA and ELP concentrations and commercially available adhesives and (c) MeHA/ELP hydrogels (2% MeHA and 10% ELP) containing 0, 0.1, and 0.2% ZnO. (d) Schematic of the modified standard lap shear test (ASTM F2255–05). Shear strength of (e) MeHA/ELP hydrogels produced by using different MeHA and ELP concentrations and commercially available adhesives and (f) MeHA/ELP hydrogels (2% MeHA and 10% ELP) containing 0, 0.1, and 0.2% ZnO (* p < 0.05, ** p < 0.01, *** p < 0.001, **** p < 0.0001).