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AAPS PharmSciTech. 2006 June; 7(2): E148–E153.
Published online 2006 June 2. doi:  10.1208/pt070252
PMCID: PMC2750279

Dissolution improvement of high drug-loaded solid dispersion


This study focused on an investigation of a high drug-loaded solid dispersion system consisting of drug, carrier, and surfactant. Solid dispersions of a water-insoluble ofloxacin (OFX) with polyethylene glycol (PEG) of different molecular weights, namely binary solid dispersion systems, were prepared at drug to carrier not less than 5[ratio]5. Polysorbate 80, a nonionic surfactant, was incorporated into the binary solid dispersion systems as the third component to obtain the ternary solid dispersion systems. The powder x-ray diffraction and differential scanning calorimetric studies indicated that crystalline OFX existed in the solid dispersions with high drug loading. However, a decreased crystallinity of the solid dispersions obtained revealed that a portion of OFX was in an amorphous state. The results indicated a remarkably improved dissolution of drug from the ternary solid dispersion systems when compared with the binary solid dispersion systems. This was because of polysorbate 80, which improved wettability and solubilized the non-molecularly dispersed or crystalline fraction of OFX.

Keywords: ofloxacin, ternary solid dispersion, polysorbate 80, dissolution, drug loading

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.
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