Dissolution improvement of high drug-loaded solid dispersion.

Area of Science:

• Pharmaceutical Sciences
• Materials Science

Background:

• Water-insoluble drugs often exhibit poor bioavailability.
• Solid dispersion technology can enhance drug solubility and dissolution.
• Ofloxacin (OFX) is a water-insoluble antibiotic requiring formulation improvements.

Purpose of the Study:

• To investigate the effect of a nonionic surfactant, polysorbate 80, on the dissolution of high drug-loaded ofloxacin solid dispersions.
• To compare the performance of binary (drug-carrier) and ternary (drug-carrier-surfactant) solid dispersion systems.

Main Methods:

• Preparation of binary solid dispersions of ofloxacin (OFX) with polyethylene glycol (PEG) of varying molecular weights.
• Incorporation of polysorbate 80 to form ternary solid dispersion systems.
• Characterization using powder X-ray diffraction (PXRD) and differential scanning calorimetry (DSC).
• In vitro dissolution testing to assess drug release.

Main Results:

• Powder XRD and DSC confirmed the presence of crystalline and amorphous ofloxacin in the solid dispersions.
• Ternary solid dispersion systems exhibited significantly improved drug dissolution compared to binary systems.
• Polysorbate 80 enhanced the wettability and solubilization of ofloxacin.

Conclusions:

• Ternary solid dispersions containing polysorbate 80 are effective in enhancing the dissolution of water-insoluble ofloxacin.
• Polysorbate 80 plays a crucial role in improving drug release by enhancing wettability and solubilization.
• This formulation strategy holds promise for improving the bioavailability of poorly soluble drugs.