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Schematic illustrations of chemical crosslinking mechanism: (A) Gelation by photo-crosslinking reaction of vinyl groups bearing polymers. (B) Gelation by alkyne-azide click reaction with Cu (I) as catalyst. (C) Gelation by Schiff’s base reaction between aldehyde and amine groups. (D) Gelation by enzymatic reaction with horseradish peroxidase and hydrogen peroxide as catalyst system. Adapted with permission from ref. [8]. Copyright © 2015 European Polymer Journal.
