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Related Experiment Videos

Cryogenic liquids, nanoparticles, and microencapsulation.

Troy Purvis1, Jason M Vaughn, True L Rogers

  • 1College of Pharmacy, University of Texas at Austin, Austin, TX 78712, USA.

International Journal of Pharmaceutics
|July 4, 2006
PubMed
Summary
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Spray freezing into liquid (SFL) and evaporative precipitation into aqueous solution (EPAS) create amorphous drug particles. These novel formulations enhance drug dissolution and bioavailability for BCS class II compounds.

Area of Science:

  • Pharmaceutical Sciences
  • Materials Science
  • Biotechnology

Background:

  • Biopharmaceutical Classification System (BCS) categorizes drugs based on solubility and permeability.
  • BCS class II drugs are poorly soluble but highly permeable, with dissolution limiting bioavailability.
  • Enhancing wetting and reducing particle size can accelerate dissolution for BCS class II drugs.

Purpose of the Study:

  • To investigate novel particle engineering techniques for improving the bioavailability of BCS class II drugs.
  • To evaluate the efficacy of spray freezing into liquid (SFL) and evaporative precipitation into aqueous solution (EPAS) processes.
  • To demonstrate enhanced in vivo performance of drug particles produced by SFL and EPAS.

Main Methods:

  • Utilized spray freezing into liquid (SFL) to atomize and rapidly freeze drug solutions, creating amorphous drug/excipient particles.

Related Experiment Videos

  • Employed evaporative precipitation into aqueous solution (EPAS) to produce aqueous suspensions of nanostructured drug particles.
  • Characterized particle properties and assessed in vivo bioavailability and efficacy of engineered drug particles.

    • Main Results:

    • SFL and EPAS processes yielded amorphous drug particles with high surface areas, enhanced wetting, and increased dissolution rates.
    • In vivo studies showed significantly increased serum levels of danazol (DAN) and itraconazole (ITZ) compared to conventional forms.
    • Pulmonary delivery of SFL-processed ITZ particles extended survival times in a murine fungal infection model.

    Conclusions:

    • SFL and EPAS are effective methods for engineering amorphous drug particles with improved physicochemical properties.
    • These processes lead to enhanced drug dissolution, supersaturation of biological fluids, and increased in vivo bioavailability and efficacy.
    • The engineered particles offer a promising strategy for improving therapeutic outcomes of poorly soluble drugs.