R KALAİSELVAN, G P MOHANTA, K KANNAN, P K MANNA, R MANAVALAN
Acta Pharmaceutica Sciencia - 2006;48(3):141-151
The main aim of the study was to investigate the moisture absorption behavior and the molecular mobility of albendazole-polyvinylpyrrolidone solid dispersions. Moisture gain magnitude of the dispersions was found to be significantly less compared to the amorphous physical mixture upon equilibration with 75% RH. Such decrease in moisture absorption magnitude was found to be high at 35-50% polymer content. The extent of plasticization of absorbed water was observed to be minimum at 50% polymer content. Therefore, the drug-polymer weight ratio was optimized to be 1:1 for obtaining the physically stable dispersion. Morphology of the solid dispersion of 1:1 drug-polymer mixing ratio was investigated using scanning electron microscopy. The tablets (equivalent to 400 mg of albendazole) formulated using this solid dispersion complied with the pharmacopoeial dissolution requirement.
