Polyelectrolyte Complexation versus Ionotropic Gelation for Chitosan-Based Hydrogels with Carboxymethylcellulose, Carboxymethyl Starch, and Alginic Acid

Figure 11

FTIR Spectra from hydrogel samples made of CMS (a) 3.2% by (b) ionotropic gelation with CaCl₂ 1% w/v, (c) polyelectrolyte complexation with CS 0.01% w/v, and (d) combination of ionotropic gelation and polyelectrolyte complexation.