eng Oriental Scientific Publishing Company Biosciences Biotechnology Research Asia 0973-1245 2016-05-05 8 2 425 434 9234 article Mohammad Sadeghi 1 Nahid Ghasemi 1 Mojgan Yarahmadi 2 Department of Chemistry, Science Faculty, Islamic Azad University, Arak Branch, Arak (Iran). Department of English, Faculty of Humanities, Arak Branch, Islamic Azad University, Arak (Iran). The present work focused on the design of drug delivery system (DDS) based on a pH-sensitive hydrogel. The hydrogels were prepared via graft copolymerization of 2-acrylamido-2-methylpropanesulfonic acid (AMPS) monomer onto collagen backbones by a free radical polymerization technique. Sodium bicarbonate (NaHCO3) was added to function as a foaming agent under acidic conditions, rendering the hydrogels to be porous. Porous structure of hydrogel was essential in this system to yield a large surface area so that Acetaminophen release could be facilitated. The hydrogel thus prepared possessed a porous structure as determined by scanning electron microscopy. Due to the reversible swelling behavior of the hydrogels, the synthesized networks can sense the environmental pH change and achieve an oscillatory release pattern. The concentration of released Acetaminophen loaded was monitored at 266 nm on the UV spectrophotometer. Water absorption of the hydrogel could be switched on and off swiftly by control of pH of the surrounding environment. Therefore, the synthesized hydrogels in this work can be used as a drug delivery system, and that the drug release can be controlled by the pH of solution. https://www.biotech-asia.org/vol8no2/drug-release-study-from-superabsorbent-hydrogel-based-on-poly-2-acrylamido-2-methylpropanesulfonic-acid-grafted-collagen/ Collagen; Hydrogel; Acetaminophen; Releasing drug