Preparation and sustained release bacteriostatic performance of pH-responsive complex hydrogel bacteriostatic microspheres for oral drug delivery.

pH-responsive hydrogel antibacterial microspheres were prepared by complex coacervation method and used as drug carriers to load the antibiotic substitute potassium diformate (KDF). The results showed that the three-dimensional network structure of the composite hydrogel was formed among the polysaccharide components, and Zeolite A loaded with KDF was uniformly dispersed in it. The results of drug release behavior and kinetics in vitro showed that the drug release rate was higher and the release mechanism followed the Ritger-Peppas model, which indicated that the antibacterial microspheres had a good pH response. In vitro, the carrier showed broad-spectrum antibacterial activity, good biocompatibility, and degradability. Sodium carboxymethylcellulose and pectin synergistic by hydrogen bonding, potassium dicarboxylate-loaded Zeolite A is filled in a three-dimensional hydrogel network, and chitosan quaternary ammonium salts coat the outer layer. [ABSTRACT FROM AUTHOR]