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Int J Pharm. 2013 Aug 16;452(1-2):173-9. doi: 10.1016/j.ijpharm.2013.04.075. Epub 2013 May 4.

Solubility enhancement of paclitaxel using a linear-dendritic block copolymer.

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School of Pharmacy and Biomedical Sciences, University of Central Lancashire, Preston PR1 2HE, UK.


The solubilising capacities of micelles of a linear-dendritic copolymer (BE-PAMAM), formed by conjugating the poly(butylene oxide) (B)-poly(ethylene oxide) (E) block copolymer B16E42 (BE) with a G2 PAMAM dendrimer, have been compared with those of the diblock copolymer B16E42 for the anti-cancer drug paclitaxel. The BE-PAMAM copolymer showed a greater solubility enhancement than BE under equivalent conditions. Drug-loading efficiency was improved using a solvent-loading method compared with the conventional solution-loading method. The solubility of paclitaxel was increased 3700-fold by micellar encapsulation in a 2% (w/v) BE-PAMAM copolymer solution at 37°C using this solubilisation technique. Dynamic light scattering and transmission electron microscopy studies indicated a transition of spherical to worm-like micelles of the BE copolymer induced by the encapsulation of drug molecules. A sustained release of encapsulated drug was observed, with approximately 80% and 60% paclitaxel being released from 2% (w/v) solutions of BE and BE-PAMAM respectively after 24h of dialysis at 37°C.

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