AAPS PharmSciTech

, Volume 12, Issue 2, pp 658–664

Development and Evaluation of a Floating Multiparticulate Gastroretentive System for Modified Release of AZT

  • Valquíria Miwa Hanai Yoshida
  • José Martins de Oliveira Junior
  • Marcos Moisés Gonçalves
  • Marta Maria Duarte Carvalho Vila
  • Marco Vinícius Chaud
Research Article Theme: Advanced Technologies for Oral Controlled Release

DOI: 10.1208/s12249-011-9627-9

Cite this article as:
Yoshida, V.M.H., de Oliveira Junior, J.M., Gonçalves, M.M. et al. AAPS PharmSciTech (2011) 12: 658. doi:10.1208/s12249-011-9627-9

Abstract

The aim of this study was to develop and evaluate a floating multiparticulate gastroretentive system for the modified release of zidovudine (AZT). AZT was used as a model drug water-soluble at therapeutic doses. The floating gastroretentive system was obtained by co-precipitation, after solvent diffusion and evaporation. The proposed system was evaluated in vitro for particle morphology, lag time and floating time, loading rate, release profile, and the release kinetic of AZT release. AZT’s physico-chemical characteristics were evaluated by differential scanning calorimetry (DSC), X-ray diffraction (XDR) and infrared spectroscopy (IR). The particles obtained were sphere-shaped, hollow, and had porous walls. The floating was immediate, and floating time was higher than 12 h. The loading rate was 34.0 ± 9.0%. The system obtained had an extended release. DSC and XDR results showed a modification in AZT’s solid state. IR spectroscopy revealed that the chemical structure of the AZT was unchanged. The hollow microballoons presented gastroretentive, floating, and extended-release properties.

KEY WORDS

AZTextended releasegastroretentive floating systemmicroballoonsmodified releasezidovudine

Copyright information

© American Association of Pharmaceutical Scientists 2011

Authors and Affiliations

  • Valquíria Miwa Hanai Yoshida
    • 1
  • José Martins de Oliveira Junior
    • 1
  • Marcos Moisés Gonçalves
    • 1
  • Marta Maria Duarte Carvalho Vila
    • 1
  • Marco Vinícius Chaud
    • 1
    • 2
  1. 1.Pharmaceutical Sciences Post-graduate ProgramSorocaba UniversitySorocabaBrazil
  2. 2.Department of Pharmaceutical SciencesSorocaba UniversitySorocabaBrazil