Butylene oxide-ethylene oxide block copolymer surfactants as...

A - Human Necessities – 61 – K

Patent

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A61K 9/14 (2006.01) A61K 9/51 (2006.01)

Patent

CA 2193503

This invention provides a composition comprised of nanoparticles containing a therapeutic or diagnostic agent having a nonionic polymeric surfactant as a surface modifier adsorbed on the surface thereof, the surfactant being a block copolymer of ethylene oxide and butylene oxide and a method of making such nanoparticles. The compositions exhibit reduced macrophage uptake and improved toxicological profiles and facilitate particle size reduction such that milling time cut be reduced and/or sterile filtration of the nanoparticles can be accomplished.

Cette invention se rapporte à une composition comprenant des nanoparticules contenant un agent thérapeutique ou diagnostique qui possède un tensioactif polymère non ionique agissant comme agent modificateur de surface adsorbé sur la surface en question, ce tensioactif étant un copolymère bloc d'oxyde d'éthylène et d'oxyde de butylène, et l'invention se rapporte également à un procédé de fabrication des nanoparticules. Les compositions présentent une absorption réduite des macrophages et de meilleurs profils toxicologiques, et facilitent la comminution des particules de sorte que le temps de broyage peut être réduit et/ou que la filtration stérile des nanoparticules peut être réalisée.

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