Aqueous dispersion comprising stable nanoparticles of a...

A - Human Necessities – 61 – K

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A61K 9/10 (2006.01) A61K 9/16 (2006.01) A61K 9/51 (2006.01)

Patent

CA 2456180

A process for the preparation of a stable dispersion of solid particles, in an aqueous medium comprising combining (a) a first solution comprising a substantially water-insoluble substance, a water-miscible organic solvent and an inhibitor with (b) an aqueous phase comprising water and optionally a stabiliser, thereby precipitating solid particles comprising the inhibitor and the substantially water-insoluble substance; and optionally removing the water- miscible organic solvent; wherein the inhibitor is a non-polymeric hydrophobic organic compound as defined in the description. The process provides a dispersion of solid particles in an aqueous medium, which particles exhibit reduced or substantially no particle growth mediated by Ostwald ripening.

L'invention concerne un procédé de préparation d'une dispersion stable de particules solides dans un milieu aqueux. Ce procédé consiste à combiner (a) une première solution comprenant une substance sensiblement insoluble dans l'eau, un solvant organique hydrosoluble et un inhibiteur avec (b) une phase aqueuse comprenant de l'eau et éventuellement un agent stabilisant, précipitant ainsi des particules solides comprenant l'inhibiteur et la substance sensiblement insoluble dans l'eau. Ce procédé consiste également à éliminer éventuellement le solvant organique hydrosoluble, l'inhibiteur étant un composé organique hydrophobe non polymérique tel que défini dans la description. Ce procédé permet d'obtenir une dispersion de particules solides dans un milieu aqueux, ces particules faisant preuve d'une croissance particulaire à médiation assurée par mûrissement d'Ostwald réduite ou nulle.

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