Polyelectrolyte vs Polyampholyte Behavior of Composite Chitosan/Gelatin Films.

ABSTRACT: Composite films of proteins and polysaccharides have a broad range of biomedical and food packaging applications, in which they are frequently exposed to fluid environments with varying ionic strengths. In the present work, we report the behavior of biopolymer films derived from chitosan (Ch), gelatin (GEL), and Ch/GEL mixture in salt solutions with varying concentrations and ion charges. The swelling and dissolution of the Ch films reduced with increasing salt concentration due to the polyelectrolyte behavior of this biopolymer, while the GEL films displayed a polyampholyte behavior, in which film swelling and dissolution were enhanced in salt solutions. Composite Ch/GEL films followed the behavior of GEL. The release of small ionic and zwitter-ionic molecules from the films was enhanced

SUBMITTER: Pinto Ramos D 

PROVIDER: S-EPMC6647984 | biostudies-literature | 2019 May

REPOSITORIES: biostudies-literature