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Related Experiment Videos

Evaluation of hydrate-screening methods.

Yong Cui1, Erica Yao

  • 1Small Molecule Pharmaceutical Development, Genentech, Inc, 1 DNA Way, South San Francisco, California 94080, USA. yongcuil0@hotmail.com

Journal of Pharmaceutical Sciences
|October 5, 2007
PubMed
Summary
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No single method reliably identifies drug hydrates. Combining techniques like slurry in water (Slurry) or temperature cycling (TCS) with mixed solvent systems (MSS) improves hydrate screening for new drug candidates.

Area of Science:

  • Pharmaceutical Sciences
  • Materials Science
  • Chemical Engineering

Background:

  • Drug candidate development requires understanding solid-state properties.
  • Hydrates are common crystalline forms of drugs, impacting stability and bioavailability.
  • Reliable hydrate screening is crucial for successful drug development.

Purpose of the Study:

  • To evaluate the effectiveness of common hydrate-screening techniques.
  • To provide guidelines for designing optimal hydrate-screening programs.
  • To identify the most reliable methods for detecting hydrate forms in new drug candidates.

Main Methods:

  • Ten hydrate-forming compounds were used as models.
  • Six different hydrate-screening approaches were applied: dynamic water vapor sorption/desorption isotherm (DVI), high humidity (HH) storage, slurry in water (Slurry), temperature cycling of aqueous suspension (TCS), mixed solvent systems (MSS), and vapor diffusion (VD).

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Main Results:

  • No single method achieved universal success; a combination of techniques is recommended.
  • Slurry and TCS methods showed high success rates (90%), suitable for various compounds.
  • MSS was effective for water-insoluble compounds, while VD had moderate success (80%) but experimental challenges.
  • DVI and HH methods had lower success rates (60-70%) and higher risk of false negatives for nonhygroscopic compounds.

Conclusions:

  • A reliable hydrate-screening strategy must consider compound solubility and hygroscopicity.
  • Combining Slurry or TCS with MSS offers a robust screening approach.
  • Optimized screening programs enhance the identification of drug hydrates early in development.