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Related Experiment Videos

Polymorphism of spironolactone.

V Agafonov1, B Legendre, N Rodier

  • 1Laboratories de Chimie Minérale, Faculté de Pharmacie, Châtenay-Malabry, France.

Journal of Pharmaceutical Sciences
|February 1, 1991
PubMed
Summary

Researchers explored various crystalline forms of spironolactone, a key pharmaceutical compound. They analyzed crystal structures, stability, and molecular conformations, revealing insights into solid-state properties.

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Area of Science:

  • Solid-state chemistry
  • Crystallography
  • Pharmaceutical sciences

Background:

  • Spironolactone is a widely used medication with known therapeutic applications.
  • Understanding its solid-state properties, including polymorphism and solvation, is crucial for drug formulation and stability.
  • Previous research has identified different crystalline forms, but a comprehensive analysis of their structural and stability characteristics is needed.

Purpose of the Study:

  • To synthesize and characterize novel crystalline forms of spironolactone.
  • To investigate the morphological, symmetrical, and crystallographic properties of these forms.
  • To evaluate the stability and interconversion pathways of spironolactone crystals under various conditions.

Main Methods:

  • Synthesis of spironolactone single crystals using diverse solvents.

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  • Characterization techniques including X-ray diffraction (XRD), Differential Scanning Calorimetry (DSC), and Thermogravimetric Analysis (TGA).
  • Analysis of crystal morphology, symmetry, and lattice parameters.

    • Main Results:

    • Successfully obtained six distinct crystalline forms of spironolactone: two polymorphic and four solvated.
    • Detailed crystallographic data (morphology, symmetry, parameters) were determined for five forms.
    • Stability studies revealed distinct thermal behaviors and transformation tendencies among the different crystal forms, with structural analysis of three forms showing conformational changes in spironolactone molecules.

    Conclusions:

    • Multiple crystalline forms of spironolactone exist, influenced by solvent choice.
    • These forms exhibit varying stability and conformational characteristics, impacting their solid-state behavior.
    • The findings provide valuable data for optimizing spironolactone's pharmaceutical formulation and manufacturing processes.