Delivery system for bioactive agents on the basis of a...

A - Human Necessities – 61 – K

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A61K 47/34 (2006.01) C08G 63/91 (2006.01)

Patent

CA 2564719

Delivery system for bioactive agents on the basis of a polymeric drug carrier formed from compositions comprising an amphiphilic block copolymer of a hydrophilic block and a hydrophobic block having a terminal hydroxyl group substituted with a tocopherol or cholesterol group, and a polylactic acide derivative wherein one end of the polylactic acid is covalently bound to at least one carboxyl group. The carboxyl group of the polylactic acid derivative may be fixed with a di- or trivalent metal ion,which is obtained by adding the di- or trivalent metal ion to the polymeric composition.

La présente invention se rapporte à un système d'administration pour agents bioactifs basés sur un excipient médicamenteux polymère formé à partir de compositions comportant un copolymère séquencé amphiphile d'un bloc hydrophile et d'un bloc hydrophobe ayant un groupe terminal hydroxyle substitué par un groupe tocophérol ou cholestérol, et un dérivé d'acide polylactique dont une extrémité est liée de manière covalente à au moins un groupe carboxyle. Le groupe carboxyle du dérivé d'acide polylactique peut être fixé avec un ion de métal di- ou trivalent, ce qui peut être obtenu par addition de l'ion du métal di- ou trivalent à la composition polymère.

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