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

Figure 7

Cumulative % release of pheniramine maleate from AA/Gelatin hydrogels after 12 h using different concentrations of acrylic acid (28.0, 32.0, and 36.0 g) and EGDMA as cross-linking agent (0.7% of AA) at various pH values in 0.05 M USP phosphate buffer solutions.