Development of novel formulations for Chagas? disease. Optimization of benznidazol chitosan microparticles based on artificial neural networks.

LEONARDI, D.; SALOMÓN, C. J.; LAMAS, M. C.; OLIVIERI, A. C.

INTERNATIONAL JOURNAL OF PHARMACEUTICS

Elsevier

Lugar: Amsterdan; Año: 2009 vol. 367 p. 140 - 147

0378-5173

Benznidazole (BZL) is one of the two therapeutic agents used for the treatment of Chagas disease. However, the use of BZL in most pharmaceutical preparations and research experiments is still limited due to its low water solubility (0.4 mg/mL). To overcome the dissolution rate limiting step in oral absorption, chitosan microparticles prepared by the coacervation method were chosen, owing to nontoxicity of the polymers and mild conditions of the method. The influence of process parameters such as encapsulation efficiency, size, yield, and dissolution rate were optimized by using artificial neural networks (ANNs). The optimal conditions were found to be 1.5 % w/v for the polymer concentration, 6.0 % w/v for the coacervation agent concentration, 1400.0 rpm for the stirring rate, and 5.0 mL/min for the spraying rate. Confirmation experiments showed good agreement between predicted and experimental values of the optimized properties. These results indicate that ANNs is a valuable tool for the development of optimized BZL chitosan microparticles. To our knowledge it is the first report based on the development of optimized BZL microparticles.