Antimicrobial properties of chitosan and its derivatives

Abstract

The minimum inhibitory concentration(MIC) of chitosan and its derivatives on bacteria and fungi were evaluated,effects of the different concentrations of chitosan and its derivatives on inhibitory activities were studied.Meanwhile,compound preservations were made with chitosan as main reagents and sodium diacetate as the auxiliary,the different concentrations of the compound preservation water solutions were filmed on the surface of the bracken,then preserved at room temperature.The results showed that there were stronger inhibitory effects of chitosan and its derivatives on bacteria and fungi,and their inhibitory activities were higher than sodium diacetate and sodium benzoate,in which chitosan-thiourea-Ag+ had the strongest inhibitory activity,which could inhibit the bacteria under the concentration of 0.0025%.Furthermore,the preserved bracken mainly kept its original taste and nutritious value,and remained green without mildew.