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Molecular Interactions between APIs and Enteric Polymeric Excipients in Solid Dispersion: Insights from Molecular
Krishna M Gupta1, Xavier Chin1, Parijat Kanaujia1,2
1Institute of Sustainability for Chemicals, Energy and Environment (ISCE2), Agency for Science, Technology and Research (A*STAR), 1 Pesek Road, Jurong Island, Singapore 627833, Singapore.
Understanding molecular interactions between drug substances and polymers is key for developing effective solid dispersions. This study used simulations and hot melt extrusion to identify optimal drug-polymer pairs, enhancing drug dissolution and bioavailability.
Area of Science:
- Pharmaceutical Sciences
- Materials Science
- Computational Chemistry
Background:
- Solid dispersions enhance oral bioavailability of poorly soluble drugs.
- Intermolecular interactions are crucial for successful solid dispersion formulation.
- Predicting drug-polymer compatibility is essential for development.
Purpose of the Study:
- To assess molecular interactions between delayed-release APIs and polymeric excipients.
- To formulate API solid dispersions using hot melt extrusion.
- To identify optimal API-polymer pairs for improved drug delivery.
Main Methods:
- Molecular dynamics (MD) simulations to evaluate interaction energy (electrostatic, Lenard-Jones, total) and hydrogen bonding.
- Hot melt extrusion (HME) technique for formulating solid dispersions.
- In vitro drug release studies in simulated gastric and intestinal fluids.
Main Results:
- Identified optimal API-polymer pairs: NPX-Eudragit L100, NaDLO-HPMC(P), DMF-HPMC(AS), and OPZ-HPMC(AS) based on interaction energies.
- Successfully extruded several API-polymer formulations using HME.
- Extruded solid dispersions showed pH-dependent release, with no release in SGF (pH 1.2) and release in SIF (pH 6.8).
Conclusions:
- Demonstrated compatibility between selected APIs and polymeric excipients.
- Suggested specific polymeric excipients for delayed-release APIs to enhance dissolution and bioavailability.
- Provided a framework for facilitating solid dispersion development for poorly soluble drugs.
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