Estudo de metodologia para avaliação de estreptoquinase em produtos biofarmacêuticos

Abstract

Streptokinase is clinically used as a thrombolytic agent for the treatment of patients with acute myocardial infarction and venous and arterial thrombosis. In the present work, a substrate chromogenic assay was validated for the potency evaluation of biopharmaceutical formulations. Method validation investigated parameters such as the linearity (r²=0.9988) intra- and inter- day precision, accuracy and robustness; the method yielded good results with a quantitation limit of 2.50 IU/mL and a detection limit of 1.10 IU/mL. The biological assay was carried out by chromogenic end point giving potencies between 98.42% and 108.97%. The results demonstrated the validity of the chromogenic assay for the potency assessment of streptokinase in biopharmaceutical formulations. Besides, the activities of streptodornase and streptolysin were evaluated in the same samples by optimized assays based on the biological activity, giving results according to the Pharmacopoeial specifications. The combination of assays is necessary to assure the quality, and to improve the methods that can be applied for the characterization of streptokinase, by ensuring batch-to-batch consistency of the bulk and finished biopharmaceutical products.