In situ formation of enzyme-free hydrogels via ferromagnetic microbead-assisted enzymatic cross-linkingElectronic supplementary information (ESI) available: Experimental details and additional data for HRP-beads. See DOI: 10.1039/c4cc04436c

In situ formation of horseradish peroxidase (HRP)-free gelatin hydrogels was achieved via ferromagnetic microbead-assisted enzymatic cross-linking. Gelation time and mechanical stiffness of the hydrogels can be tuned in situ , which makes HRP-free gelatin hydrogels suitable for injectable cell delivery. This work reports a new in situ enzymatic crosslinking method to prepare mechanically tunable hydrogels not possessing an enzyme.