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Investigating the Correlation between Miscibility and Physical Stability of Amorphous Solid Dispersions Using

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Molecular Pharmaceutics
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Fluorescence techniques effectively assess drug-polymer miscibility in amorphous solid dispersions (ASDs), revealing a strong link between miscibility and physical stability, crucial for drug formulation development.

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Area of Science:

  • Pharmaceutical Sciences
  • Materials Science
  • Physical Chemistry

Background:

  • Amorphous solid dispersions (ASDs) enhance drug solubility and bioavailability.
  • Understanding drug-polymer miscibility is critical for ASD physical stability.
  • Current methods for assessing miscibility can be complex and time-consuming.

Purpose of the Study:

  • To evaluate the feasibility of fluorescence-based techniques for assessing drug-polymer miscibility.
  • To investigate the correlation between drug-polymer miscibility and the physical stability of ASDs.
  • To determine the miscibility limits of indomethacin with various polymers in ASDs.

Main Methods:

  • Utilized fluorescence spectroscopy and imaging to evaluate miscibility.
  • Employed differential scanning calorimetry (DSC) and infrared (IR) spectroscopy for complementary analysis.
  • Assessed physical stability of ASDs using fluorescence imaging and X-ray diffraction (XRD) under accelerated conditions (40 °C).

Main Results:

  • Established miscibility limits for indomethacin with HPMC (50-60%), HPMCAS (20-30%), and PVP (70-80%).
  • Demonstrated a direct correlation between drug loading exceeding miscibility limits and accelerated crystallization.
  • Observed that indomethacin-PVP ASDs remained amorphous across all tested compositions.

Conclusions:

  • Fluorescence-based methods are promising tools for evaluating drug-polymer miscibility in ASDs.
  • Enhanced miscibility directly correlates with improved physical stability of ASDs, preventing drug crystallization.
  • Miscibility is a key determinant for the long-term physical stability and performance of amorphous solid dispersions.