New combined process for the purification of vancomycin...

C - Chemistry – Metallurgy – 07 – K

Patent

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C07K 9/00 (2006.01) C07K 1/20 (2006.01) C07K 1/30 (2006.01)

Patent

CA 2210990

The present invention discloses a new process for the purification of vancomycin hydrochloride by combining preparative chromatography on a silica gel column and the precipitation with ethanol from a salt-water-ethanolic solution without intermediary filtering, whereby the chromatographic purity of the product is improved. The chromatography is carried out on a column containing a silica gel stationary phase and an alkaline-water-methanolic mobile phase at defined pH, mobile phase flow and temperature as well as the amount and concentration of vancomycin hydrochloride. The process is distinguished by the yield and chromatographic purity of the obtained product of about 93% area. Vancomycin hydrochloride purified according to the present invention is useful for peroral as well as parenteral administration since the portion of impurities it contains is for one third smaller than in hitherto available products.

Nouveau procédé de purification du chlorhydrate de vancomycine associant la chromatographie de préparation sur colonne de gel de silice à la précipitation par éthanol à partir d'un solution d'éthanol dans de l'eau salée, sans filtrage intermédiaire, afin d'obtenir un produit présentant une pureté chromatographique améliorée. La chromatographie s'effectue sur une colonne renfermant une phase stationnaire de gel de silice et une phase aqueuse mobile ayant un pH, un débit de phase mobile et une température déterminés, tout comme le sont la quantité et la concentration du chlorhydrate de vancomycine. Ce procédé est caractérisé par le rendement et la pureté chromatographique du produit obtenu sur environ 93 % de la surface. Le chlorhydrate de vancomycine purifié selon ce procédé peut être administré aussi bien par voie perorale que par voie parentérale car sa teneur en impuretés est inférieure d'un tiers à celle des produits disponibles jusqu'à maintenant.

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