Fig. 1. Schematic illustration of HRP-mediated extrusion bioprinting in air Dissolved hydrogen peroxide in the surrounding air initiates horseradish peroxidase (HRP)-catalyzed crosslinking of phenol-modified hyaluronic acid in the extruded bioink, enabling shape retention after deposition. Representative printed constructs are shown on the right. Adapted from Ref. 12.
Fig. 2 Visible light-induced hydrogelation of phenol-modified alginate (Alg-Ph) and its application to stereolithographic bioprinting (a) Schematic of Ru(II)/persulfate-mediated visible light crosslinking of Alg-Ph. (b) Gelation of the Alg-Ph precursor solution upon irradiation with visible light. (c) Experimental setup for visible light-based stereolithographic bioprinting. (d) Representative hydrogel construct fabricated by this method. Adapted from Ref. 31.
Fig. 3 Schematic illustration of support-assisted bioprinting using a bioink containing phenolated hyaluronic acid (HA-Ph) and HRP, and a support material containing H2O2 Upon alternating extrusion of the bioink and the support material, HRP-catalyzed crosslinking is induced at the interface, leading to improved shape retention of the printed construct. Representative printed constructs obtained in the absence and presence of support material are shown on the right. Adapted from Ref. 40.
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