Fig. 10. Release of naproxen from the gel to the aqueous phase (a) UV spectra of naproxen release at different times from the gel formed by compound 20 (5.6 mg) in 2.0 mL of DMSO : H2O (v/v 1 : 7) with naproxen (0.25 mg) in the presence of phosphate buffered saline at pH 7.47 (2.0 mL) on top of the gel. (b) The % release at different times based on the UV absorbance at 331 nm.
