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Colloidal Interactions in Simulated Intestinal Fluids: Implications for Oral Drug Delivery at the Nanoscale.
Juliane Fjelrad Christfort1, Matteo Tollemeto1, Yudong Li2
1The Danish National Research Foundation and Villum Foundation's Center IDUN Department of Health Technology Technical University of Denmark 2800 Kgs. Lyngby Denmark.
Simulated intestinal fluids affect oral drug delivery by altering nanoparticle behavior and mucoadhesion. Understanding these colloidal interactions is crucial for developing effective oral therapeutics.
Area of Science:
- Pharmaceutical Sciences
- Colloid and Surface Chemistry
Background:
- Oral drug delivery is the preferred route, necessitating advanced strategies for new therapeutics.
- Colloidal structures in simulated intestinal fluids (SIFs) significantly impact oral drug performance.
Purpose of the Study:
- To investigate the influence of SIFs with varying compositions on drug solubility, nanoparticle aggregation, cytotoxicity, and mucoadhesion.
- To characterize nanoparticle-drug interactions and polymer behavior in physiologically relevant conditions.
Main Methods:
- Utilized five simulated intestinal fluids (SIFs) with diverse bile salt and phospholipid content.
- Employed dynamic light scattering (DLS) for nanoparticle characterization and interaction analysis.
- Applied quartz crystal microbalance with dissipation (QCM-D) analysis to assess mucoadhesion.
Main Results:
- Drug solubility and colloidal structure size varied with SIF composition; felodipine solubility was lipid-dependent.
- Nanoparticle interactions (aggregation, combination) in SIFs correlated with Caco-2 cell cytotoxicity.
- Mucoadhesion of nanoparticles and polymers was significantly altered in SIFs; polyethylene oxide lost interaction, while chitosan retained partial mucoadhesion.
Conclusions:
- SIF composition critically influences oral drug delivery performance, including solubility, nanoparticle behavior, and mucoadhesion.
- Physiologically relevant testing is essential for evaluating drug delivery systems, considering nanoparticle-drug interactions and cell compatibility.
- Understanding colloidal dynamics in SIFs is key for optimizing oral nanoparticle and polymer-based drug formulations.
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