Development and evaluation of a floating multiparticulate gastroretentive system for modified release of AZT.

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.

journal_name

AAPS PharmSciTech

journal_title

AAPS PharmSciTech

authors

Yoshida VM,de Oliveira Junior JM,Gonçalves MM,Vila MM,Chaud MV

doi

10.1208/s12249-011-9627-9

subject

Has Abstract

pub_date

2011-06-01 00:00:00

pages

658-64

issue

2

issn

1530-9932

journal_volume

12

pub_type

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