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Related Experiment Videos

Linking solubility and permeability assays for maximum throughput and reproducibility.

David S Wexler1, Liping Gao, Francisco Anderson

  • 1Lead Discovery Department, AGY Therapeutics Inc., South San Francisco, CA 94080, USA. dwexler@agyinc.com

Journal of Biomolecular Screening
|June 21, 2005
PubMed
Summary

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A new combined assay efficiently measures drug solubility and permeability, crucial for absorption. This method streamlines drug discovery by reducing sample use and improving data accuracy for gastrointestinal tract and blood-brain barrier models.

Area of Science:

  • Pharmacokinetics and Drug Discovery
  • Biophysical Chemistry
  • Membrane Transport

Background:

  • Drug absorption is governed by solubility and permeability, traditionally assessed separately.
  • This separation presents challenges in accurately predicting in vivo drug behavior.
  • Developing integrated assays is key for efficient drug development.

Purpose of the Study:

  • To introduce a novel, combined assay for simultaneously determining drug solubility and membrane permeability.
  • To streamline the assessment of drug absorption properties for chemical entities.
  • To provide a more efficient method for characterizing drug candidates.

Main Methods:

  • Solubility is measured at four pH values by comparing saturated and dilute solutions.

Related Experiment Videos

  • The saturated solution from the solubility assay serves as input for permeability testing.
  • Parallel Artificial Membrane Permeation Assay (PAMPA) models the gastrointestinal tract and blood-brain barrier (BBB).

    • Main Results:

    • The combined assay demonstrated reduced sample usage and preparation time.
    • Elimination of compound precipitation interference in permeability assays was observed.
    • Maximized input concentrations improved assay reproducibility and data reliability.
    • BBB permeability rankings correlated well with known central nervous system (CNS) activity.

    Conclusions:

    • The integrated solubility/permeability assay offers significant advantages over traditional separate methods.
    • This approach enhances efficiency and accuracy in drug absorption profiling.
    • The assay provides a valuable tool for predicting drug behavior, particularly for CNS-targeted therapies.