Method for separation and purification of naltrexone by...

C - Chemistry – Metallurgy – 07 – D

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C07D 489/08 (2006.01) B01D 15/32 (2006.01)

Patent

CA 2611105

A process for the purification of an impure preparation containing naltrexone by means of a reverse phase preparative chromatography process is provided. In an illustrative embodiment a chromatographic column is loaded with a stationary phase, typically a silica particle having an organic ligand bound thereto. With a loading ratio of from about 10 to about 1000 the impure preparation is acidified and passed through the column. The column is eluted with typically an aqueous solution with acetonitrile and the purified naltrexone is obtained in a specified fraction.

La présente invention se rapporte à un procédé permettant de purifier une préparation impure contenant du naltrexone, à l'aide d'un procédé de chromatographie préparative en phase inverse. Dans un mode de réalisation exemplaire, le procédé selon l'invention consiste : à charger une colonne de chromatographie avec une phase stationnaire, en général une particule de silice à laquelle est fixée un ligand organique ; à acidifer la préparation impure et à la faire passer à travers la colonne, avec un rapport de charge compris entre 10 et 1000 ; et à procéder à l'élution de la colonne, en général à l'aide d'une solution aqueuse contenant de l'acétonitrile, ce qui permet d'obtenir le naltrexone purifié dans une fraction spécifiée.

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