Modeling the influence of cyclodextrins on oral absorption of low-solubility drugs: I. Model development
| Autor: | Rebecca Lyn Carrier, Imran Ahmed, Lee A. Miller, Ece D. Gamsiz, Avinash G. Thombre |
|---|---|
| Rok vydání: | 2010 |
| Předmět: |
Drug
Absorption (pharmacology) Cyclodextrins Drug Carriers Chromatography Chemistry media_common.quotation_subject Administration Oral Biological Availability Bioengineering Models Biological Applied Microbiology and Biotechnology Combinatorial chemistry Controlled release Dosage form Absorption Bioavailability Pharmaceutical Preparations Solubility Drug delivery Dissolution testing Biotechnology media_common |
| Zdroj: | Biotechnology and Bioengineering. 105:409-420 |
| ISSN: | 1097-0290 0006-3592 |
| Popis: | The ability to quantitatively predict the influence of a solubilization technology on oral absorption would be highly beneficial in rational selection of drug delivery technology and formulation design. Cyclodextrins (CDs) are cyclic oligosaccharides which form inclusion complexes with a large variety of compounds including drugs. There are many studies in the literature showing that complexation between CD and drug enhances oral bioavailability and some demonstrating failure of CD in bioavailability enhancement, but relatively little guidance regarding when CD can be used to enhance bioavailability. A model was developed based upon mass transport expressions for drug dissolution and absorption and a pseudo-equilibrium assumption for the complexation reaction with CD. The model considers neutral compound delivered as a physical mixture with CD in both immediate release (IR) and controlled release (CR) formulations. Simulation results demonstrated that cyclodextrins can enhance, have no effect, or hurt drug absorption when delivered as a physical mixture with drug. The predicted influence depends on interacting parameter values, including solubility, drug absorption constant, binding constant, CD:drug molar ratio, dose, and assumed volume of the intestinal lumen. In general, the predicted positive influence of dosing as a physical mixture with CD was minimal, alluding to the significance of dosing as a preformed complex. The model developed enabled examination of which physical and chemical properties result in oral absorption enhancement for neutral drug administered as a physical mixture with CD, demonstrating the utility of modeling the influence of a drug delivery agent (e.g., CD) on absorption for rational dosage form design. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Plný text