Editorial on the Special Issue "Chitosan Functional Hydrogels: Synthesis and Applications".

Chitin, a polysaccharide composed of β-(1-4)-linked 2-deoxy-2-acetamido-d-glucose units, is found in cell walls of different organisms, including crustaceans, fungi, insects, some algae, microorganisms, and some invertebrate animals, and its deacetylation into chitosan confers it with incredible chemical versatility allowing it to be processed into numerous products [...].