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Related Experiment Videos

Highly compressible paracetamol: I: crystallization and characterization.

H A Garekani1, J L Ford, M H Rubinstein

  • 1School of Pharmacy and Chemistry, Liverpool John Moores University, Byrom Street, L3 3AF, Liverpool, UK.

International Journal of Pharmaceutics
|November 7, 2000
PubMed
Summary

Polyvinylpyrrolidone (PVP) effectively modifies paracetamol crystallization and crystal habit. Higher molecular weight PVP enhances particle morphology, forming near-spherical structures without altering paracetamol

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Area of Science:

  • Pharmaceutical Sciences
  • Materials Science
  • Chemical Engineering

Background:

  • Paracetamol crystallization is crucial for its therapeutic efficacy.
  • Controlling crystal habit impacts drug dissolution and bioavailability.
  • Polyvinylpyrrolidone (PVP) is a common polymer excipient with potential crystallization modifying properties.

Purpose of the Study:

  • To investigate the effect of polyvinylpyrrolidone (PVP) on paracetamol crystallization.
  • To determine how different molecular weights and concentrations of PVP influence paracetamol crystal habit and structure.
  • To assess the impact of PVP incorporation on the solid-state properties of paracetamol.

Main Methods:

  • Paracetamol crystallization experiments were conducted in the presence of varying concentrations and molecular weights of PVP.

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  • Crystal habit and morphology were analyzed using microscopy.
  • Differential scanning calorimetry (DSC) and X-ray powder diffraction (XPD) were employed to evaluate structural modifications.

    • Main Results:

    • Polyvinylpyrrolidone (PVP) significantly influenced paracetamol crystallization and crystal habit, attributed to adsorption on crystal surfaces.
    • Higher molecular weight PVP (10000 and 50000) was more effective than lower molecular weight PVP (2000).
    • Paracetamol particles formed with higher molecular weight PVP exhibited near-spherical structures composed of agglomerated microcrystals. DSC and XPD confirmed no structural modifications in PVP-crystallized paracetamol.
    • Increased PVP molecular weight and concentration led to higher PVP incorporation into paracetamol particles, reaching a maximum of 4.32% w/w.

    Conclusions:

    • Polyvinylpyrrolidone (PVP) acts as an effective crystallization additive for paracetamol, significantly altering crystal habit.
    • Higher molecular weight PVP is more potent in modifying paracetamol crystal morphology.
    • PVP incorporation does not induce structural changes in paracetamol, suggesting its utility in controlling particle properties without compromising solid-state integrity.