Preparation of N-Alkylated Quaternary Ammonium Chitosan and Its Application in Antibacterial Finishing of Rabbit Hair Fabric

Abstract Alkylated chitosan was obtained by alkylation of chitosan(CTS) with n-butyraldehyde, the product was then reacted with trichlorodihydroxypropyl triethyl ammonium chloride(CHPTAC-ethyl) to form n-alkylated quaternary ammonium chitosan. Its chemical structure was characterized by FTIR, and its physicochemical properties, such as viscosity-average molecular weight and solubility, were determined by viscosity and spectrophotometry. The antimicrobial activity of the modified chitosan was determined by the minimal antimicrobial method, and the minimum effective antimicrobial concentration (MIC) of the product against escherichia coli was 0.15g/L, which was better than the MIC value of the natural chitosan. Using citric acid as cross-linking agent and sodium hypophosphate as catalyst, the antibacterial finishing of rabbit hair fabric with modified chitosan showed that the antibacterial rate of n-alkylated quaternary ammonium chitosan to Escherichia coli was over 99.9%, and the antibacterial rate was better than that of natural chitosan, and it was a kind of good natural macromolecule antibacterial finishing agent for animal hair fabric.