By complexation of chitosan obtained by a mechanochemical method in a twin-screw extruder with dextran sulfate in different ratios (1 : 1, 1 : 2, and 2 : 1), nanoparticles were formed and studied by dynamic laser light scattering to evaluate their hydrodynamic radius and zeta potential. The effect of an increase in the filler concentration in the form of the obtained nanoparticles (from 0 to 5%) on the physico-mechanical characteristics of chitosan-based films, as well as their antimicrobial activity against the Gram-positive bacterium Bacillus subtilis, the Gram-negative bacterium Escherichia coli and the mycelial fungus Aspergillus niger, was evaluated. The results showed that the properties of the films depend on the concentration of the nanoscale filler, providing the best indicators of deformation and strength properties, opacity and antibacterial activity with the highest content of nanoparticles. Thus, in the course of the study, chitosan’s capabilities, such as film formation and complexation, were used to demonstrate the potential of producing packaging materials based on it with improved functional properties with minimal resource costs.
T. N. Popyrina (Wed,) studied this question.