title: Investigation of the Dissolution Profile of Gliclazide Modified-Release Tablets Using Different Apparatuses and Dissolution Conditions.
abstract: In the absence of an official dissolution method for modified-release tablets of gliclazide, dissolution parameters, such as apparatuses (1, 2, and 3), rotation speeds, pH, and composition of the dissolution medium were investigated. The results show that although the drug presents a pH-mediated solubility (pH 7.0 > 6.8 > 6.4 > 6.0 > 5.5 > 4.5), the in vitro release of the studied tablets was not dependent on this parameter, despite of the apparatus tested. On the other hand, the rotation speed demonstrated a greater influence (100 rpm >50 rpm). Using similar hydrodynamic conditions, the three different apparatuses were compared in pH 6.8 and provided the following trend: apparatus 1 at 100 rpm >2 at 50 rpm ≈3 at 10 dpm. As a complete, but slow release is expected from modified-release formulations, apparatus 2, in phosphate buffer pH 6.8 and 100 rpm, were selected as the optimized dissolution method. In comparison to apparatus 1 under the same conditions, the paddle avoids the stickiness of formulation excipients at the mesh of the basket, which could prejudice the release of gliclazide. Results obtained with biorelevant medium through the developed dissolution method were similar to the buffer solution pH 6.8. The application of the optimized method as a quality control test between two different brands of gliclazide modified-release tablets showed that both dissolution profiles were considered similar by the similarity factor (f2 = 51.8). The investigation of these dissolution profiles indicated a dissolution kinetic following first-order model.
authors: Departamento de Ciências Farmacêuticas, Universidade Federal de Santa Catarina, Campus Reitor João David Ferreira Lima, Trindade, 88040-970, Florianópolis, Santa Catarina, Brazil.
authors: K K S
authors: KKS
authors: Skripnik
authors: Departamento de Ciências Farmacêuticas, Universidade Federal de Santa Catarina, Campus Reitor João David Ferreira Lima, Trindade, 88040-970, Florianópolis, Santa Catarina, Brazil.
authors: M K
authors: MK
authors: Riekes
authors: Departamento de Ciências Farmacêuticas, Universidade Federal de Santa Catarina, Campus Reitor João David Ferreira Lima, Trindade, 88040-970, Florianópolis, Santa Catarina, Brazil.
authors: B R
authors: BR
authors: Pezzini
authors: Departamento de Ciências Farmacêuticas, Universidade Federal de Santa Catarina, Campus Reitor João David Ferreira Lima, Trindade, 88040-970, Florianópolis, Santa Catarina, Brazil.
authors: S G
authors: SG
authors: Cardoso
authors: Departamento de Ciências Farmacêuticas, Universidade Federal de Santa Catarina, Campus Reitor João David Ferreira Lima, Trindade, 88040-970, Florianópolis, Santa Catarina, Brazil. hellen.stulzer@gmail.com.
authors: H K
authors: HK
authors: Stulzer
mesh_terms: D002626:Chemistry, Pharmaceutical / Q000379:methods*; D003692:Delayed-Action Preparations / Q000032:analysis / Q000737:chemistry; D005079:Excipients / Q000032:analysis / Q000737:chemistry; D005907:Gliclazide / Q000032:analysis* / Q000737:chemistry*; D012995:Solubility; D013607:Tablets / Q000737:chemistry
chemical_list: D003692:Delayed-Action Preparations; D005079:Excipients; D013607:Tablets; D005907:Gliclazide
keywords: dissolution apparatuses; dissolution method; gliclazide; modified release