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Assessing Physical Stability Risk Using the Amorphous Classification System (ACS) Based on Simple Thermal Analysis.

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    This summary is machine-generated.

    This study introduces a new classification system for ranking the physical stability of amorphous pharmaceuticals using milligram quantities. This method aids in early risk assessment for amorphous solid dispersion formulations.

    Keywords:
    amorphous classification system (ACS)amorphous solid dispersions (ASD)configurational entropycrystallizationdifferential scanning calorimetry (DSC)molecular mobilityphysical stabilityrisk assessment

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    Area of Science:

    • Pharmaceutical Sciences
    • Materials Science
    • Physical Chemistry

    Background:

    • Amorphous solid dispersions are crucial for enhancing drug solubility and bioavailability.
    • Physical stability is a key challenge in developing amorphous pharmaceutical formulations.
    • Early risk assessment tools are needed to predict and mitigate stability issues.

    Purpose of the Study:

    • To develop a classification system for ranking the physical stability of amorphous pharmaceuticals.
    • To establish an early risk assessment tool for amorphous solid dispersion formulations.
    • To utilize milligram quantities of compounds for stability analysis.

    Main Methods:

    • Differential scanning calorimetry (DSC) was employed for thermal analysis.
    • Characterization of molecular mobility and configurational entropy.
    • Utilized fragility strength parameter and heat capacity change at Tg as indicators.

    Main Results:

    • A four-class system (Class I to IV) was defined for physical stability ranking.
    • Forty diverse pharmaceuticals with known stability were analyzed.
    • The methodology successfully classified compounds based on their stability.

    Conclusions:

    • The developed classification system provides an accessible framework for early risk assessment.
    • Molecular mobility and configurational entropy are critical factors for amorphous phase stability.
    • This approach facilitates the development of more stable amorphous pharmaceutical formulations.