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    Development of polyampholyte hydrogels based on laponite for electrically stimulated drug release
    (Wiley, 2015) Ekici, Sema; Tetik, Ayca
    Polyampholyte hydrogels (PAHs) composed of laponite, polyacrylamide and poly(3-acrylamidopropyl)trimethylammonium chloride crosslinked with ethylene glycol dimethacrylate were synthesized and characterized for their sensitivity to external conditions and their ability to control the release of the active drug agent paracetamol. Three PAHs were synthesized by taking the weight ratio of laponite to total monomer as 7, 15 and 29%. PAHs were characterized using Fourier transform infrared spectroscopy, thermogravimetric analysis and swelling measurements carried out in various media. Equilibrium and pulsatile swelling studies were performed on all hydrogels to determine to what extent the hydrogels would respond to changes in environmental pH, ionic strength and electric field, and how fast that response would be. Paracetamol was loaded into the hydrogels, and was released into buffered solutions as a function of pulsatile changes in pH and electric field. (c) 2014 Society of Chemical Industry