Cheng, W.P., Gray, A.I., Tetley, L., Hang, T.L.B., Schätzlein, A.G. and Uchegbu, I.F. (2006) Polyelectrolyte Nanoparticles with High Drug Loading Enhance the Oral Uptake of Hydrophobic Compounds. Biomacromolecules, 7 (5). pp. 1509-1520. 10.1021/bm060130l.
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In the pharmaceutical industry, orally active compounds are required to have sufficient water solubility to enable dissolution within the gastrointestinal tract prior to absorption. Limited dissolution within the gastrointestinal tract often reduces the bioavailability of hydrophobic drugs. To improve gastrointestinal tract dissolution, nonaqueous solvents are often used in the form of emulsions and microemulsions. Here, we show that oil-free polyelectrolyte nanosystems (micellar dispersions and 100-300 nm particles) prepared from poly(ethylenimines) derivatized with cetyl chains and quaternary ammonium groups are able to encapsulate high levels of hydrophobic drug (0.20 g of drug per g of polymer) for over 9 months, as demonstrated using cyclosporine A (log P = 4.3). The polyelectrolytes facilitate the absorption of hydrophobic drugs within the gastrointestinal tract by promoting drug dissolution and by a hypothesized mechanism involving paracellular drug transport. Polyelectrolyte nanoparticle drug blood levels are similar to those obtained with commercial microemulsion formulations. The polyelectrolytes do not promote absorption by inhibition of the P-glycoprotein efflux pump.
|Departments, units and centres:||Department of Pharmaceutical and Biological Chemistry > Department of Pharmaceutical and Biological Chemistry|
|Journal or Publication Title:||Biomacromolecules|
|Deposited By:||Library Staff|
|Deposited On:||20 Apr 2012 11:53|
|Last Modified:||20 Apr 2012 11:53|
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