Novel biocompatible and antimicrobial supramolecular O-carboxymethyl chitosan biguanidine/zinc physical hydrogels.

Zinc crosslinked supramolecular hydrogels from O-carboxymethyl chitosan biguanidine were successfully prepared. The structures of the prepared hydrogels were verified by H NMR, FTIR and XRD. FE-SEM verified the porous structure of hydrogels especially at high contents of Zn ions.

Thermal properties, crystallization and antimicrobial activity of chitosan biguanidine grafted poly(3-hydroxybutyrate) containing silver nanoparticles.

Green synthesis of novel nanocomposites series based on chitosan biguanidine grafted poly(3-hydroxybutyrate) copolymer (ChG-g-PHB) and silver nanoparticles (AgNPs) was successfully done via in situ reduction of AgNO in the copolymer matrix. Transmission electron microscopy verified the homogeneous dispersion of spherical shape of the AgNPs with an average particle size 12.3 to 19.