Capillary electrophoresis (CE) was used to follow Diclofenac tablet dissolution, in very short times and allowing
dissolution testing without volume replacement. By using Student´s t test and F-test, this CE method was compared
with HPLC. Statistical data show that there are no significant differences among them. The drug release kinetic of diclofenac
tablets was described by various mathematical models and equations. Model-Independent Methods: t50% = 10.34
min; t80% = 20 min; DE% = 79.41% and MDT = 10.85 min, show that diclofenac tablet dissolution rate is very high, having
80% drug dissolution within 20 minutes. Model-Dependent Methods. The kinetics models used were: zero order, first
order, Hixson–Crowell cube root law, Higuchi model, and Weibull model. Criteria used to choose the best model was by
comparisson of r2 and AIC (Akaike Information Criteria). The model that best adjusts diclofenac tablet dissolution profile
was the Hixson-Crowell cube root model.
Keywords: Capillary electrophoresis, diclofenac, dissolution, Hixson-Crowell, quantification, tablets.
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