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Probing the Amorphous State of Pharmaceutical Compounds Within Mesoporous Material Using Pair Distribution Function

Alfonso E Garcia-Bennett1, Michael Lau2, Nicholas Bedford3

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Loading poorly soluble drugs into mesoporous materials impacts their dissolution. Mesopore design and drug properties influence release rates, offering insights for pharmaceutical formulation.

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drug deliverymesoporouspair distribution functionsolid dosage formssolubility

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Area of Science:

  • Materials Science
  • Pharmaceutical Science
  • Physical Chemistry

Background:

  • Poorly soluble pharmaceutical compounds pose formulation challenges.
  • Mesoporous materials offer high surface area for drug loading.
  • Understanding drug behavior within confined spaces is crucial for drug delivery.

Purpose of the Study:

  • To investigate the effect of mesoscale confinement on the dissolution behavior of pharmaceutical compounds.
  • To explore the relationship between drug properties, mesopore structure, and drug release kinetics.
  • To identify methods for rationalizing the behavior of encapsulated compounds.

Main Methods:

  • Loading pharmaceutical compounds into mesoporous silica materials.
  • Utilizing structural and calorimetric characterization.
  • Employing atomic pair distribution function (PDF) analysis.
  • Conducting dissolution experiments.

Main Results:

  • Atomic PDF analysis identified local ordering of drug molecules, which X-ray diffraction and calorimetry could not detect.
  • Drug descriptors like crystallization properties and glass transition temperature aid in rationalizing encapsulated compound behavior.
  • Mesopore design, including the presence of micropores and loading amount, significantly affects drug release rates.

Conclusions:

  • Mesopore engineering and understanding drug-specific properties are key to controlling dissolution and release kinetics.
  • Atomic PDF analysis provides valuable insights into the local structure of amorphous drugs within mesoporous hosts.
  • This approach enables rational design of drug delivery systems for poorly soluble compounds.