mPEG-CHO (MW 750) is involved in the formation of three-dimensional porous scaffolds and acts as a delivery vector when carrying active substances. The -CHO functional group interacts with the -NH2 functional group of chitosan chains to form a glutaraldehyde-like adduct, resulting in the functionalization of mPEG. This functionalization and crosslinking can affect the rigidity of the delivery system, enabling the crosslinked conjugated system to have a slow release function.