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Challenges and Strategies for Solubility Measurements and Dissolution Method Development for Amorphous Solid
Andre Hermans1, Johanna Milsmann2, Hanlin Li3
1Analytical Research and Development, Merck & Co., Inc., Rahway, New Jersey, USA. andre_hermans@merck.com.
Developing amorphous solid dispersions (ASDs) for poorly soluble drugs presents unique dissolution challenges. This review offers recommendations for solubility measurements and quality control dissolution methods for ASDs.
Area of Science:
- Pharmaceutical Sciences
- Drug Delivery
- Physical Chemistry
Background:
- Amorphous solid dispersions (ASDs) are crucial for formulating poorly soluble drugs, improving oral absorption.
- ASD formulations can achieve supersaturation, posing challenges for solubility characterization and dissolution testing.
- Accurate solubility and dissolution data are vital for drug absorption and product quality control.
Approach:
- This review categorizes challenges in solubility measurement and dissolution method development for ASDs.
- It addresses the definition of solubility, sink conditions, and non-sink dissolution applications for ASDs.
- The review also evaluates the use of dissolution testing for detecting crystallinity in ASD formulations.
Key Points:
- Defining solubility and sink conditions for ASD dissolution requires careful consideration.
- Non-sink dissolution methods are applicable for ASD formulation screening and quality control (QC) method development.
- Dissolution testing offers advantages and disadvantages for assessing ASD crystallinity.
Conclusions:
- Addressing these challenges is essential for robust ASD development and control strategies.
- Sharing successful dissolution experiment examples can foster scientific consensus on ASD dissolution testing.
- Standardized methods will ensure the quality and efficacy of ASD-based oral dosage forms.
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