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Related Experiment Videos

Solvent-drop grinding: green polymorph control of cocrystallisation.

Andrew V Trask1, W D Samuel Motherwell, William Jones

  • 1Pfizer Institute for Pharmaceutical Materials Science, Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge, UK CB2 1EW.

Chemical Communications (Cambridge, England)
|March 27, 2004
PubMed
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Researchers achieved control over the polymorphic outcome of novel cocrystallization by using a minimal amount of solvent during grinding. This method offers precise control over the crystal forms of pharmaceutical compounds like caffeine.

Area of Science:

  • Crystallization science
  • Materials science
  • Pharmaceutical chemistry

Background:

  • Polymorphism in pharmaceutical compounds can significantly impact drug efficacy and stability.
  • Controlling the polymorphic outcome is crucial for consistent drug performance.
  • Caffeine is a widely used model pharmaceutical compound for crystallization studies.

Purpose of the Study:

  • To investigate a novel cocrystallization method for controlling the polymorphic outcome of caffeine.
  • To determine the effect of solvent polarity on cocrystal formation during mechanochemical processing.
  • To establish a scalable and efficient method for producing specific caffeine polymorphs.

Main Methods:

  • Mechanochemical cocrystallization using a grinding technique.

Related Experiment Videos

  • Minimal solvent addition with varying polarities.
  • Powder X-ray diffraction (PXRD) for polymorphic analysis.
  • Differential scanning calorimetry (DSC) for thermal characterization.

    • Main Results:

    • Control over the polymorphic outcome of caffeine cocrystallization was achieved by adjusting solvent polarity during grinding.
    • Specific polymorphic forms were selectively obtained by optimizing the solvent-grinding conditions.
    • The mechanochemical approach demonstrated efficient and selective cocrystal formation.

    Conclusions:

    • Grinding with minimal, appropriately polar solvent addition is an effective strategy for controlling caffeine cocrystallization polymorphism.
    • This method provides a tunable approach to pharmaceutical cocrystal engineering.
    • The findings have implications for the development of new solid forms of active pharmaceutical ingredients.