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Dissolution profiles of 500 mg theophylline granules 30–35 mesh, 20% theophylline) in 900 mL phosphate buffer pH 6.8 using USP apparatus II at 75 RPM (n = 3), (A) Cloisite Na nanocomposites of different clay loadings; (B) Cloisite 20 nanocomposites of different clay loadings.
