Titration Properties and pH-Dependent Aggregation of Chitosan

Chitosan is a polysaccharide consisting of N-acetyl-glucosamine and glucosamine units, prepared by the deacetylation of chitin. Glucosamine contains an ionizable primary amine, rendering chitosan water-soluble at low pH and insoluble at pH above ∼6.5. This pH dependent solubility can be exploited to make hydrogels used for coatings and sensors. We have used constant-pH molecular dynamics (CpHMD) to investigate the pH dependence of chitosan....