“…CTS solutions are also characterized by instability of viscosity properties over time, which is usually explained by the destruction of macromolecules as a result of acid hydrolysis of glycosidic bonds [5][6][7]. However, there are studies that make it possible to exclude destruction as the main reason for the decrease in the viscosity of chitosan solutions in time [8,9] and to explain this effect by conformational rearrangements of macromolecules [10], changes in the supramolecular structure, including aggregation [9,11], and also by phase separation of the system as it is stored [11,12].…”