title: Design, characterization and in vitro evaluation of stavudine-loaded microspheres.
abstract: The aim of the present study was to prepare and evaluate microspheres of Eudragit containing an antiviral drug stavudine. Microspheres were prepared by O/O solvent evaporation method using acetone/liquid paraffin system. The prepared microspheres were characterized for their micromeretic properties and entrapment efficiency; as well by Fourier transformed infrared spectroscopy (FTIR), differential scanning calorimetry (DSC), X-ray powder diffractometry (XRPD) and scanning electron microscopy (SEM) which revealed the crystalline nature of drug in a final state. The in vitro studies revealed the controlled release of drug from microspheres up to 12 h and the best fit release kinetics was achieved with a Higuchi plot and found to be diffusion controlled. The yields of preparation and entrapment efficiencies were very high with a larger particle size for all the formulations. Mean particle size, entrapment efficiency and production yield were highly influenced by the type of polymer and polymer concentration.
authors.affiliation: Department of Pharmaceutics, Smt. R. B. Patel Mahila Pharmacy College, Atkot, Gujarat, India. subhashvaghani@gmail.com
authors.forename: Subhash S
authors.initials: SS
authors.lastname: Vaghani
authors.forename: Sunil
authors.initials: S
authors.lastname: Sureja
authors.forename: Sachin
authors.initials: S
authors.lastname: Singh
authors.forename: Mitesh
authors.initials: M
authors.lastname: Gurjar
authors.forename: N P
authors.initials: NP
authors.lastname: Jivani
authors.forename: Madhabhai M
authors.initials: MM
authors.lastname: Patel
mesh_terms: D000163:Acquired Immunodeficiency Syndrome / Q000188:drug therapy; D019380:Anti-HIV Agents / Q000008:administration & dosage*; D002152:Calorimetry, Differential Scanning; D003692:Delayed-Action Preparations / Q000737:chemistry*; D006801:Humans; D008855:Microscopy, Electron, Scanning; D008863:Microspheres; D010316:Particle Size; D011109:Polymethacrylic Acids / Q000737:chemistry*; D017550:Spectroscopy, Fourier Transform Infrared; D018119:Stavudine / Q000008:administration & dosage*
chemical_list: D019380:Anti-HIV Agents; D003692:Delayed-Action Preparations; D011109:Polymethacrylic Acids; C038300:methylmethacrylate-methacrylic acid copolymer; D018119:Stavudine