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Chitosan is a natural polymer very widespread in the animal world, particularly in marine organisms. This biopolymer has three reactive groups in each glycoside unit of the polymeric chain: an amino group and two hydroxyl groups, which determine its characteristics. Between these groups, the most important is the amino group, which is responsible for the cationic nature of biopolymer and which gives its biological properties, as well as certain physical - chemical characteristics, such as solubility (at pH = 6 ? 6...