Mathematical evaluation of in vitro release profiles of hydroxypropylmethylcellulose matrix tablets containing carbamazepine associated to β-cyclodextrin

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The release kinetics of carbamazepine (CBZ) either complexed or physically mixed with β-cyclodextrin (βCD) from hydroxypropylmethylcellulose (HPMC) matrix tablets was investigated using different mathematical equations. The model-dependent approach was compared to the utilization of fit factors. Notwithstanding difference (f1) and similarity (f2) factors allowed the differentiation of the formulations containing CBZ complexed with βCD from the one containing a simple physical mixture of CBZ and βCD. The Weibull model was more useful for comparing the release profiles. Weibull parameters were more sensitive to the differences between the two release kinetic data.

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