On the synthesis of N-succinylсhitosan Bombyx mori complexes with cobalt(II) ions and their insecticidal properties against Anacanthotermes turkestanicus termites

N-succinylchitosan (N-SCS) was obtained by the reaction of chitosan derived from Bombyx mori with succinic anhydride mixed at a 1:1 molar ratio in dimethyl sulfoxide for 24 hours at 22°C and pH 7. In order to increase the effectiveness of insecticidal properties, N-succinylchitosan complexes with Co2+ ions (N-CSC/Co2+) were further obtained. The structural studies show that Co2+ ions interact with the carboxyl groups of N-succinylchitosan. The IR spectra of chitosan, N-SCS, and N-SCS/Co2+ show characteristic absorption bands at 1388, 1578, and 473 cm-1, respectively. Absorption bands characteristic of –NH–CO groups were also noticed at 1674 cm-1. The concentration dependence of the insecticidal activity of N-SCS/Co2+ solutions was studied, and it was found that a 1.0% solution exhibits 86.7% biological effectiveness against termites. The presented results are helpful for the development of eco-friendly insecticides based on natural polysaccharides.