title: Chemically cross-linked poly(acrylic-co-vinylsulfonic) acid hydrogel for the delivery of isosorbide mononitrate.
abstract: We report synthesis, characterization, and drug release attributes of a series of novel pH-sensitive poly(acrylic-co-vinylsulfonic) acid hydrogels. These hydrogels were prepared by employing free radical polymerization using ethylene glycol dimethacrylate (EGDMA) and benzyl peroxide (BPO) as cross-linker and initiator, respectively. Effect of acrylic acid (AA), polyvinylsulfonic acid (PVSA), and EGDMA on prepared hydrogels was investigated. All formulations showed higher swelling at high pHs and vice versa. Formulations containing higher content of AA and EGDMA show reduced swelling, but one with higher content of PVSA showed increased swelling. Hydrogel network was characterized by determining structural parameters and loaded with isosorbide mononitrate. FTIR confirmed absence of drug polymer interaction while DSC and TGA demonstrated molecular dispersion of drug in a thermally stable polymeric network. All the hydrogel formulations exhibited a pH dependent release of isosorbide mononitrate which was found to be directly proportional to pH of the medium and PVSA content and inversely proportional to the AA contents. Drug release data were fitted to various kinetics models. Results indicated that release of isosorbide mononitrate from poly(AA-co-VSA) hydrogels was non-Fickian and that the mechanism was diffusion-controlled.
authors.affiliation: Division of Pharmacy and Pharmaceutical Science, University of Huddersfield, Queensgate, Huddersfield HD1 3DH, UK.
authors.forename: Talib
authors.initials: T
authors.lastname: Hussain
authors.forename: Mahvash
authors.initials: M
authors.lastname: Ansari
authors.forename: Nazar Muhammad
authors.initials: NM
authors.lastname: Ranjha
authors.forename: Ikram Ullah
authors.initials: IU
authors.lastname: Khan
authors.forename: Yasser
authors.initials: Y
authors.lastname: Shahzad
mesh_terms: D000180:Acrylic Resins / Q000737:chemistry*; D002626:Chemistry, Pharmaceutical; D003432:Cross-Linking Reagents / Q000737:chemistry; D003692:Delayed-Action Preparations / Q000737:chemistry*; D004058:Diffusion; D020100:Hydrogels / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D007548:Isosorbide Dinitrate / Q000008:administration & dosage / Q000031:analogs & derivatives* / Q000737:chemistry; D008422:Materials Testing; D008689:Methacrylates / Q000737:chemistry*; D008956:Models, Chemical; D010316:Particle Size; D011145:Polyvinyls / Q000737:chemistry*; D013451:Sulfonic Acids / Q000737:chemistry*; D014665:Vasodilator Agents / Q000737:chemistry
chemical_list: D000180:Acrylic Resins; D003432:Cross-Linking Reagents; D003692:Delayed-Action Preparations; D020100:Hydrogels; D008689:Methacrylates; D011145:Polyvinyls; D013451:Sulfonic Acids; D014665:Vasodilator Agents; C008959:lyapolate; C006903:carbopol 940; C004919:ethylene dimethacrylate; D007548:Isosorbide Dinitrate; C030397:isosorbide-5-mononitrate