Carbohydrate-based micelle clusters which enhance hydrophobic drug bioavailability by up to 1 order of magnitude

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TitleCarbohydrate-based micelle clusters which enhance hydrophobic drug bioavailability by up to 1 order of magnitude
Publication TypeJournal Article
Year of Publication2006
AuthorsQu X, Khutoryanskiy VV, Stewart A, Rahman S, Papahadjopoulos-Sternberg B, Dufes C, McCarthy D, Wilson CG, Lyons R, Carter KC, Schatzlein A, Uchegbu IF
JournalBiomacromolecules
Volume7
Pagination3452-9
Date PublishedDec
Accession Number17154474
Keywords*Biological Availability, *Micelles, Carbohydrate Sequence, Carbohydrates, Chitosan/*chemistry, Drug Carriers, Molecular Sequence Data, Particle Size, Pharmaceutical Preparations/*metabolism, Prednisone, Propofol, Quaternary Ammonium Compounds/chemistry, Solubility
AbstractAmphiphilic chitosan-based polymers (Mw < 20 kDa) self-assemble in aqueous media at low micromolar concentrations to give previously unknown micellar clusters of 100-300 nm in size. Micellar clusters comprise smaller 10-30 nm aggregates, and the nanopolarity/drug incorporation efficiency of their hydrophobic domains can be tailored by varying the degree of lipidic derivatization and molecular weight of the carbohydrate. The extent of drug incorporation by these novel micellar clusters is 1 order of magnitude higher than is seen with triblock copolymers, with molar polymer/drug ratios of 1:48 to 1:67. On intravenous injection, the pharmacodynamic activity of a carbohydrate propofol formulation is increased by 1 order of magnitude when compared to a commercial emulsion formulation, and on topical ocular application of a carbohydrate prednisolone formulation, initial drug aqueous humor levels are similar to those found with a 10-fold dose of prednisolone suspension.
Short TitleBiomacromolecules