Synthesis and Characterization of Chemically Cross-Linked Acrylic Acid/Gelatin Hydrogels: Effect of pH and Composition on Swelling and Drug Release

Figure 18

FTIR spectra of (A) pure gelatin, (B) acrylic acid, (C) unloaded AA/Gelatin hydrogel, (D) loaded AA/Gelatin hydrogel, and (E) pheniramine maleate.