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Related Experiment Videos

Cosolvency and deviations from log-linear solubilization.

J T Rubino1, S H Yalkowsky

  • 1School of Pharmacy, University of North Carolina, Chapel Hill 27514.

Pharmaceutical Research
|June 1, 1987
PubMed
Summary
This summary is machine-generated.

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Drug solubility in cosolvent-water mixtures showed deviations from predicted values. Solvent structure changes, not just physical properties, likely influence these solubility patterns for phenytoin, diazepam, and benzocaine.

Area of Science:

  • Physical Chemistry
  • Pharmaceutical Sciences
  • Solubility Studies

Background:

  • Understanding drug solubility in cosolvent systems is crucial for formulation development.
  • Nonpolar drugs like phenytoin, diazepam, and benzocaine exhibit variable solubility in mixed solvents.
  • Predictive models for solubility often require refinement to account for complex solvent-drug interactions.

Purpose of the Study:

  • To measure and analyze the solubilities of three nonpolar drugs in various cosolvent-water mixtures.
  • To compare observed solubilities with predictions from a standard logarithmic solubility equation.
  • To investigate the factors contributing to deviations in drug solubility.

Main Methods:

  • Solubility measurements for phenytoin, diazepam, and benzocaine in 14 binary cosolvent-water mixtures.

Related Experiment Videos

  • Calculation of theoretical solubilities using the logarithmic solubility equation.
  • Graphical analysis of deviations between observed and calculated solubilities.
  • Evaluation of potential contributing factors, including cosolvent properties and solute crystal characteristics.

    • Main Results:

    • Observed drug solubilities deviated from calculated values across different cosolvent-water systems.
    • Similar deviation patterns were noted for all three drugs in amphiprotic and nonpolar aprotic cosolvent mixtures.
    • Dipolar aprotic cosolvent mixtures showed distinct deviation trends: positive for phenytoin and benzocaine, negative for diazepam.
    • No consistent attribution of deviations to physical properties of mixtures or solute crystal alterations.

    Conclusions:

    • Drug solubility deviations in cosolvent-water mixtures are complex and drug-specific.
    • Solvent structure modifications are suggested as a significant factor influencing these solubility deviations.
    • Further research is needed to fully elucidate the mechanisms behind altered drug solubility in mixed solvents.