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Probing the Interplay between Amorphous Solid Dispersion Stability and Polymer Functionality.

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Summary
This summary is machine-generated.

Polymer side chain functionality impacts drug crystallization in amorphous solid dispersions. Hydrogen bonding and polymer solubility are key for stabilizing nabumetone, guiding future drug formulation design.

Keywords:
amorphous solid dispersioncrystallization inhibitionphysical stabilitypolymer pharmaceutical interactionpolymer-induced heteronucleationpolymorphism

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Area of Science:

  • Pharmaceutical Science
  • Polymer Chemistry
  • Materials Science

Background:

  • Amorphous solid dispersions enhance drug stability against crystallization.
  • The role of polymer side chain functionality in stabilization is poorly understood.

Purpose of the Study:

  • Investigate how polymer side chain functionalities affect the crystallization stability of nabumetone in amorphous solid dispersions.
  • Elucidate the interplay between drug-polymer interactions and polymer solubility in stabilization.

Main Methods:

  • Synthesized functionalized polymers from a poly(chloromethylstyrene-co-styrene) parent batch.
  • Studied crystallization kinetics of nabumetone in amorphous solid dispersions with functionalized polymers.
  • Analyzed drug-polymer hydrogen bonding and polymer solubility in amorphous nabumetone.

Main Results:

  • Hydrogen bonding enhances nabumetone stability only when the polymer exhibits significant solubility in amorphous nabumetone.
  • Methylation of protic groups improved stability by increasing polymer solubility, even without hydrogen bonding.
  • Polymer glass transition temperature did not correlate with isothermal nucleation rates.

Conclusions:

  • Polymer functionality, solubility, and drug interactions are critical for designing stable amorphous solid dispersions.
  • This work provides a framework for developing polymers to inhibit crystallization of hydrophobic drugs.