There is growing interest in developing chemical and biochemical processes to obtain and modify biopolymers, and to other useful technical properties for their applications in different fields. The latest and most interesting example is chitin, it is mainly used for production of chitosan by a deacetylation reaction usually obtained in alkaline medium. Chitosan exhibits several favorable properties, such as biodegradability and biocompatibility. It also has mucoadhesive properties due to its positive charges at neutral pH that enable an ionic interaction with the negative charges of sialic...