Starch and chitosan-based antibacterial dressing for infected wound treatment via self-activated NO release strategy.

In this work, a positively charged chitosan-grafted-polyarginine (CS-N-PArg) as the macro-molecular NO donor, and a negatively charged acetalated starch (AcSt-O-PAsp) as a glucose donor, have been synthesized. To achieve the multi-enzymatic cascade system for local generation of self-supply glucose to increase the H 2 O 2 concentration for the subsequent oxidization of L-Arg into NO, the designed positively charged CS-N-PArg, negatively charged AcSt-O-PAsp, glucoamylase (GA) and glucose oxidase (GOx) are absorbed and assembled in the pore of the gelatin sponge via electrostatic interaction to establish a smart antibacterial dressings (CS/St + GOx/GA). Once stimulated by Escherichia coli (E. coli)-infected wounds (a slightly acidic environment), the cascade reaction system can sequentially induce to generate glucose, H 2 O 2 and NO, which exhibits a meaningful alternative idea for a high-performance antibacterial therapy. • The dressings could release NO gas specifically in bacterial infected skin lesions. • Acetalated starch (AcSt-O-PAsp) could release starch under weakly-acidic environment. • Chitosan–grafted–polyarginine (CS-N-PArg) has been synthesized as NO donor. • The presented exogenous H 2 O 2 way is based on the self-supply glucose. [ABSTRACT FROM AUTHOR]