Desenvolvimento e validação de métodos de quantificação: Estudo comparativo dos perfis de dissolução das cápsulas de ácido lipóico

Abstract

The lipoic acid acts as a cofactor for mitochondrial multienzyme complex, with intense ability to inhibit free radicals in aqueous and lipid being touted as a promising substance in antioxidant defense. In Brazil it is commonly marketed in capsule form for master pharmacies. Solid pharmaceutical forms tend to have problems related to bioavailability, making it necessary to perform the test of dissolution. The Brazilian Pharmacopeia does not show us in the percentage dissolution for the lipoic acid in the form of capsules, while the American Pharmacopoeia presents only the liquid chromatography (HPLC) method feeder on dissolution of this active pharmaceutical ingredient (IFA). In view of the absence of conditions in the Brazilian official code for these tests and the search for less costly techniques the goal is the development and validation of a methodology for quantification of lipoic acid on its dissolution in vitro study in capsules by UV/Vis spectrophotometry and high performance liquid chromatography ultraeficiência (CLUE). For that, physical and chemical characterization of the IFA, lipoic acid, through your recrystallization to assess purity and presence of polymorphism using TG/DTG, DSC, FTIR and DRX. To evaluate the ability of encapsulation of the wording proposed was conducted study of micromériticas properties, from analysis of the angle of repose, Hausner factor (FH), Carr index (CI) and flow rate. The method of dissolution employee followed the parameters recommended by the American Pharmacopoeia, and for the analysis of dissolution profiles was developed and validated methods of quantification of the drug by UV/Vis spectrophotometry and by CLUE, following the parameters of specificity, linearity, precision, accuracy, limits of detection and quantification, robustness. It was observed, from the results of TG/DTG-DSC, FTIR and XRD, the IFA used presented considerable purity and lacks polymorphism. The microméritico study has shown that the formulation presented a good flow. The methodologies for the quantification of samples of dissolution by UV/Vis spectrophotometry and CLUE fit in all validation parameters established, the developed formulation presented dissolved content percentage above 70%, in accordance with the official textbooks. There was a statistically significant difference between the methods studied, demonstrating the feasibility of using the Spectrophotometric method for evaluation of the in vitro dissolution, for their greater accessibility and lower cost. With this, it is concluded that the methods developed are safe and effective for the purpose intended and that the wording developed with lipoic acid led to the dissolution of the active ingredient.