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Related Experiment Videos

Study of omeprazole-gamma-cyclodextrin complexation in the solid state.

M J Arias1, J R Moyano, P Muñoz

  • 1Department of Pharmaceutical Technology, Faculty of Pharmacy, University of Seville, Spain. mjarias@fafar.us.es

Drug Development and Industrial Pharmacy
|March 30, 2000
PubMed
Summary

This study explored forming omeprazole (OME) and gamma-cyclodextrin (gamma-CD) inclusion complexes using various methods. The comprecipitation technique yielded the fastest drug release, enhancing omeprazole dissolution.

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Area of Science:

  • Pharmaceutical Sciences
  • Materials Science

Background:

  • Omeprazole (OME) is a widely used proton pump inhibitor with limited aqueous solubility.
  • Cyclodextrins, particularly gamma-cyclodextrin (gamma-CD), are known to form inclusion complexes with drugs, potentially improving their physicochemical properties.

Purpose of the Study:

  • To evaluate the formation of omeprazole-gamma-cyclodextrin inclusion complexes using different preparation methods.
  • To characterize the resulting inclusion compounds and assess their impact on omeprazole's dissolution rate.

Main Methods:

  • Preparation of inclusion complexes via kneading, spray-drying, coprecipitation, and freeze-drying.
  • Characterization using differential scanning calorimetry (DSC), infrared spectroscopy, X-ray powder diffractometry (PXRD), and scanning electron microscopy (SEM).

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  • Dissolution rate studies to compare drug release from different formulations.

    • Main Results:

    • All evaluated methods successfully produced true inclusion compounds of omeprazole and gamma-cyclodextrin.
    • PXRD and SEM provided insights into the crystallinity and surface morphology of the obtained solid phases.
    • A significant increase in the release rate of omeprazole was observed for all inclusion complexes compared to the free drug.
    • The coprecipitated product exhibited the highest dissolution rate among all prepared solid phases.

    Conclusions:

    • Formation of omeprazole-gamma-cyclodextrin inclusion complexes can be achieved through various techniques.
    • The coprecipitation method is most effective in enhancing the dissolution rate of omeprazole.
    • These findings suggest that complexation with gamma-CD is a viable strategy to improve omeprazole's bioavailability.