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Polymorphism refers to the existence of a drug substance in multiple crystalline forms, known as polymorphs. Recently, this term has been expanded to include solvates (forms containing a solvent), amorphous forms (non-crystalline forms), and desolvated solvates (forms from which the solvent has been removed).
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Luciana L DeMatos1, Adrian C Williams, Steven W Booth

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Solvent choice significantly impacts piracetam crystallization, affecting polymorph formation, stability, and hydrate structures. Understanding these solvent influences is crucial for controlling drug crystallization processes.

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Area of Science:

  • Crystallization science
  • Materials science
  • Pharmaceutical chemistry

Background:

  • Piracetam (2-oxo-pyrrolidineacetamide) is a nootropic drug with known polymorphs and hydrate forms.
  • Controlling crystallization is vital for pharmaceutical manufacturing, impacting drug efficacy and stability.

Purpose of the Study:

  • To investigate the influence of various solvents on piracetam polymorph and hydrate crystallization.
  • To characterize the crystal growth profiles and transformation kinetics of piracetam polymorphs in different solvents.

Main Methods:

  • In situ energy dispersive X-ray diffraction (EDXRD) was used to monitor crystallization.
  • Time-resolved diffraction snapshots were collected across different solvent systems (water, methanol, 2-propanol, isobutanol, nitromethane).
  • Crystal growth profiles were constructed to analyze polymorph formation and conversion.

Main Results:

  • Solvents influenced the lifetime, rate, and temperature of piracetam polymorph conversions (Form I to II to III).
  • Isopropanol and nitromethane favored the kinetically stable Form I, while inhibiting Form II to III transformation.
  • Aqueous solutions yielded novel piracetam hydrate forms, distinct from the known monohydrate, involving transient structures.

Conclusions:

  • Solvent selection is a critical parameter for controlling piracetam's solid-state forms.
  • Understanding solvent-mediated crystallization pathways is essential for reproducible pharmaceutical production.
  • Novel hydrate forms of piracetam were identified, expanding knowledge of its solid-state chemistry.