In this study, a series of pH sensitive microgels (MGs) were prepared by modified free radical suspension polymerization of 2-hydroxyethyl methacrylate (HEMA) and itaconic acid (IA), using ethylene glycol dimethacrylate (EGDMA) as crosslinker. Equilibrium swelling technique was employed for esomeprazole magnesium trihydrate (EMT) loading. Prepared microgels were characterized through Fourier transforms infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), dynamic light scattering technique (DLS), scanning electron microscopy (SEM), equilibrium swelling and in vitro drug release kinetics. FTIR and TGA confirmed the formation of copolymeric p(HEMA-co-IA) network. SEM and DLS revealed smooth, round and uniformly distributed microspheres with particle size up to 10 μm. Developed microgels found to be pH responsive in nature. All the formulations (HIDI - HID5) followed Higuchi model with non-Fickian diffusion mechanism of drug release. It was concluded that p(HEMA-co-IA) microgels have potential to be used as drug carriers for site specific and controlled drug delivery.
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