[Galactosylated derivatives of low-molecular-weight chitosan: production and properties].

Chitosan, a binary heteropolysaccharide consisting of 2-acetamide-2-deoxy-beta-D-glucopyranose and 2-amino-2-deoxy-beta-D-glucopyranose residues linked in different proportions via beta-glycosidic bonds. The presence of a primary amino group in the chitosan structure allows for the synthesis of various derivatives. The procedure of obtaining activated N-hydroxysuccinimide esters with the use of lactobionic acid was applied to obtain galactosylated derivatives of low-molecular-weight chitosan with a substitution degree varying from 8 to 23%. The properties of these derivatives (viscosity, solubility, and biodegradability) were studied. These derivatives are well soluble at pH values greater than the acidity constant of amino groups of chitosan (6.5). Broadening the pH range towards increase and the presence of galactose residues allows these derivatives to be used in working with biological objects.