Fig. 10

a Schematic representation of Alginate-Gelatin composite generated with the Schiff- base reaction. b Illustration of the self-healing process in the Oxidized Alginate-Gelatin type B (OxA-GB) hydrogel. The bottom left image depicts the crosslinked hydrogel cutting in three pieces. The bottom right image shows the stretching of the hydrogel after the recoupling of the pieces (optimum healing time: 7 days). c Schematic representation of the OxA crosslinking with gelatin in the presence of borax [64]. Pettignano, A., et al., Self-healing alginate–gelatin biohydrogels based on dynamic covalent chemistry: elucidation of key parameters. Materials Chemistry Frontiers. 2017, 1(1):73–79. Copyright (2020)