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

Table 3

Amount of pheniramine maleate loaded and released.

Sample codes	Amount of pheniramine maleate; loaded (g/g of dry gel)			Amount of pheniramine maleate released (%); (pH of the solution)
	By swelling	By weight	By extraction	1.2	5.5	7.5
U4	0.069	0.066	0.068	25.53	52.67	71.01
U5	0.073	0.071	0.075	27.81	56.92	76.54
U6	0.077	0.075	0.079	29.73	62.45	80.55
U7	0.081	0.079	0.082	30.37	67.76	82.83
U8	0.078	0.075	0.071	22.28	54.29	74.45
U9	0.071	0.069	0.066	20.09	50.62	69.59