Influence of water-soluble polymers on the dissolution of nifedipine solid dispersions with combined carriers

Chemical & Pharmaceutical Bulletin
H Suzuki, H Sunada

Abstract

The objective of this investigation was to clarify the influence of water-soluble polymers on the dissolution behavior of nifedipine from solid dispersions with combined carriers. All the solid dispersions of nifedipine were prepared by the fusion method using nicotinamide and 4 different water-soluble polymers, hydroxypropylmethyl-cellulose (HPMC), polyvinylpyrrolidone (PVP), partially hydrolyzed polyvinyl alcohol (PVA) and pullulan. HPMC, PVP or PVA dissolved in the fused liquid of nicotinamide and operated efficiently on the amorphous formation of nifedipine in solid dispersions. In dissolution studies, the drug concentration for these dispersions increased to more than twice intrinsic drug solubility. The rank order of the drug concentration was HPMC > PVP > PVA. However, since pullulan did not dissolve in the fused nicotinamide, nifedipine was present as a crystalline state in the solid dispersion; the supersaturation behavior of the drug was scarcely observed. The compatibility, namely, the solubility and miscibility, between nicotinamide or nifedipine and the polymers, was determined by differential scanning calorimetry using the mixtures treated with fusing and subsequent rapid cooling. Both HPMC and PVP exhibited high ...Continue Reading

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