Development of a dissolution test for lamotrigine in tablet form using an ultraviolet method

A finalidade deste estudo foi desenvolver e validar um método de dissolução para o fármaco lamotrigina na forma farmacêutica comprimido. Este método também foi utilizado para comparar o perfil de dissolução entre o Neural® e o produto de referência Lamictal®. O procedimento analítico foi realizado utilizando-se espectrofotometria de absorção no ultravioleta (267 nm) como forma de quantificação do fármaco. Após a determinação da solubilidade e das condições sink, os parâmetros selecionados foram: pás (50 rpm), 900 mL de ácido clorídrico 0.01 M e o tempo de 30 minutos (único ponto). Este método foi validado através da especificidade, linearidade, exatidão, precisão e robustez. A estabilidade da lamotrigina também foi avaliada no meio de dissolução.A dissolution test for tablets containing 100 mg of lamotrigine was developed and validated. The dissolution test was applied to compare the dissolution profile of Neural® with the reference product Lamictal®. The analysis procedure was carried out using a simple ultraviolet method at 267 nm. After the determination of solubility and sink conditions, the parameters selected were paddles at 50 rpm, 900 mL of 0.01 M hydrochloric acid, and 30 minutes duration (single point). This method was validated for specificity, linearity, accuracy, precision and robustness. Lamotrigine stability was also evaluated in dissolution medium

Development of a simple, rapid and validated spectrophotometric method for nitazoxanide in pharmaceutical formulations and comparison with HPLC

A rapid, economical, reproducible, and simple direct spectrophotometric method was developed and validated for the assay of nitazoxanide in pharmaceutical formulations. Nitazoxanide concentration was estimated in water at 345 nm and pH 4.5. The method was suitable and validated for specificity, linearity, precision, and accuracy. There was no interference of the excipients in the determination of the active pharmaceutical ingredient. The proposed method was successfully applied in the determination of nitazoxanide in coated tablets and in powders for oral suspension. This method was compared to a previously developed and validated method for liquid chromatography to the same drug. There was no significative difference between these methods for nitazoxanide quantitation