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Related Experiment Videos

Stability study of amorphous valdecoxib.

Anshuman A Ambike1, K R Mahadik, Anant Paradkar

  • 1Department of Pharmaceutics, Poona College of Pharmacy and Research Center, Bharati Vidyapeeth Deemed University, Erandwane, Pune 411038, Maharashtra, India.

International Journal of Pharmaceutics
|September 1, 2004
PubMed
Summary

This study shows that spray-dried solid dispersions of valdecoxib with polyvinylpyrrolidone (PVP) maintain drug solubility and dissolution rates, offering a stable amorphous form for poorly water-soluble drugs.

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Area of Science:

  • Pharmaceutical Sciences
  • Materials Science
  • Drug Delivery

Background:

  • Poorly water-soluble drugs pose significant formulation challenges for oral delivery.
  • Creating amorphous solid dispersions (SDs) enhances drug solubility and dissolution rates.
  • Spray drying is a key technique for producing amorphous solid dispersions.

Purpose of the Study:

  • To prepare and evaluate the stability of spray-dried solid dispersions of valdecoxib (VLD), a poorly water-soluble drug.
  • To compare the stability of VLD in solid dispersions with polyvinylpyrrolidone K30 (PVP) and hydroxypropylcellulose (HPC) against pure VLD and physical mixtures.
  • To assess the potential of PVP as a carrier for stabilizing the amorphous form of VLD.

Main Methods:

  • Solid dispersions (SDs) of VLD with PVP and HPC were prepared using spray drying.

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  • Characterization included solubility, dissolution rate, DSC, XRPD, and IR spectroscopy.
  • Stability studies were conducted at ambient conditions for 3 months.

    • Main Results:

    • Spray-dried formulations significantly increased VLD's saturation solubility and dissolution rate.
    • DSC and XRPD confirmed the formation of amorphous VLD in the SDs.
    • SDs with PVP demonstrated superior stability, retaining the amorphous form throughout the study period.
    • SDs with HPC and spray-dried VLD (SDVLD) showed recrystallization within 1 month and 15 days, respectively.

    Conclusions:

    • Solid dispersions of valdecoxib with PVP exhibit excellent stability, preserving the amorphous drug form.
    • PVP is a promising carrier for developing stable amorphous solid dispersions of poorly water-soluble drugs.
    • Spray drying is an effective method for enhancing the dissolution properties of challenging drug compounds.