Thermal Stability of Amorphous Solid Dispersions

Area of Science:

• Pharmaceutical Sciences
• Materials Science

Background:

• Amorphous solid dispersion drug delivery systems (ASD DDS) improve solubility and bioavailability of poorly water-soluble drugs.
• Polymer excipients are critical for ASD formulation, influencing drug solubility and physical stability.
• Potential chemical interactions between polymers and active pharmaceutical ingredients (APIs) can affect API thermal stability.

Purpose of the Study:

• To provide an overview of the thermal stability of amorphous solids within ASD DDS.
• To evaluate the thermal stability of amorphous solid dispersions from physicochemical, kinetic, and thermodynamic perspectives.
• To highlight the importance of thermal stability for API shelf-life and ASD formulation design.

Main Methods:

• Review of existing literature on amorphous solid dispersions and thermal stability.
• Physicochemical evaluation of thermal stability, considering kinetic (molecular motion) and thermodynamic (energy) factors.
• Focus on key parameters like activation energy and fragility in ASDs.
• Exploration of computational kinetic analysis for solid-state decomposition.

Main Results:

• Excipients, while essential for ASD performance, can influence the thermal stability of APIs.
• Thermal stability is a critical factor determining the shelf-life of pharmaceutical products formulated as ASDs.
• Understanding activation energy and fragility provides insights into the physical stability of amorphous solids.

Conclusions:

• Careful selection of polymers is essential for successful ASD formulation, considering their impact on API thermal stability.
• Thermal stability assessment is crucial for ensuring the long-term efficacy and safety of ASD products.
• A comprehensive understanding of physicochemical properties is vital for optimizing ASD design and predicting shelf-life.