Young’s modulus analysis of gelatin-coated surfaces using an atomic force microscope. (A) The surface strength of each gelatin coating concentrations was indicated through the PinpointTM nanomechanical mode. The higher the surface strength, the brighter the brown color displayed. (B) The surface roughness of each gelatin coating concentrations was indicated through the PinpointTM nanomechanical mode. A total of three points of surfaces of each sample were measured, and the strength and roughness of the surface were analyzed and graphed using AFM (NX-10, Park Systems)’s Young’s modulus software. Data were presented as mean ± SEM of N = 3 experiments. (*p < 0.05, **p < 0.01, compared with uncoating group).