title: Dissolution parameters for sodium diclofenac-containing hypromellose matrix tablet.
abstract: Sodium diclofenac (SD) release from dosage forms has been studied under different conditions. However, no dissolution method that is discriminatory enough to reflect slight changes in formulation or manufacturing process, and which could be effectively correlated with the biological properties of the dosage form, has been reported. This study sought to develop three different formulae of SD-containing matrix tablets and to determine the effect of agitation speed in its dissolution profiles. F1, F2 and F3 formulations were developed using hypromellose (10, 20 and 30%, respectively for F1, F2 and F3) and other conventional excipients. Dissolution tests were carried out in phosphate buffer pH 6.8 at 37 degrees C using apparatus II at 50, 75 or 100 rpm. Dissolution efficiency (DE), T(50) and T(90) were determined and plotted as functions of the variables agitation speed and hypromellose concentration. Regarding DE, F2 showed more sensitivity to variations in agitation speed than F1 and F3. Increasing hypromellose concentration reduced DE values, independent of agitation speed. Analysis of T(50) and T(90) suggests that F1 is less sensitive to variations in agitation speed than F2 and F3. Most discriminatory dissolution conditions were observed at 50 rpm. Results suggest that the comparison of dissolution performance of SD matrix tablets should take into account polymer concentration and agitation conditions.
authors: Núcleo de Investigações Químico-Farmacêuticas, Curso de Farmácia, Universidade do Vale do Itajaí, Rua Uruguai, 358, Centro, CEP 88302-202 Itajaí-SC, Brazil. smourao@univali.br
authors: Samanta C
authors: SC
authors: Mourão
authors: Cristiane
authors: C
authors: da Silva
authors: Tania M B
authors: TM
authors: Bresolin
authors: Cristina H R
authors: CH
authors: Serra
authors: Valentina
authors: V
authors: Porta
mesh_terms: D000894:Anti-Inflammatory Agents, Non-Steroidal / Q000737:chemistry*; D002021:Buffers; D002626:Chemistry, Pharmaceutical; D003692:Delayed-Action Preparations; D004008:Diclofenac / Q000737:chemistry*; D004337:Drug Carriers; D006244:Hardness; D006863:Hydrogen-Ion Concentration; D065347:Hypromellose Derivatives; D007700:Kinetics; D008747:Methylcellulose / Q000031:analogs & derivatives* / Q000737:chemistry; D008956:Models, Chemical; D012995:Solubility; D013607:Tablets; D013678:Technology, Pharmaceutical / Q000379:methods; D013696:Temperature
chemical_list: D000894:Anti-Inflammatory Agents, Non-Steroidal; D002021:Buffers; D003692:Delayed-Action Preparations; D004337:Drug Carriers; D013607:Tablets; D004008:Diclofenac; D065347:Hypromellose Derivatives; D008747:Methylcellulose