Process for the isolation of pseudomonic acid a from...

C - Chemistry – Metallurgy – 12 – P

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C12P 17/00 (2006.01) C12P 17/02 (2006.01) C12P 17/16 (2006.01)

Patent

CA 2360840

A process for the isolation of the pseudomonic acid A antibiotic of pharmaceutical quality from the culture broth of one of the pseudomonic acid A- producing species of the Pseudomonas bacterium genus comprising the extraction of the biosynthesized pseudomonic acid A from the culture broth at acidic pH with a chlorinated aliphatic hydrocarbon or isobutyl acetate, followed by purification, is disclosed. The invention includes processes for purification of the isolated pseudomonic acid A, including (a) by the distribution of the evaporated extract residue between the aqueous-alcohol and some aliphatic or aromatic hydrocarbon, and then the extraction of the increased water- containing aqueous-alcoholic phase with methylene chloride, ethyl acetate, or isobutyl acetate; (b) by the extraction of the extract with aqueous ammonium hydrogen carbonate, alkali metal hydroxide or ammonium hydroxide solution and the acidification of the resulting alkaline aqueous extract, then reextraction again with a chlorinated aliphatic hydrocarbon or isobutyl acetate; and (c) by the concentration of the extract and the recrystallization of the crystalline pseudomonic acid A in a mixture of isobutyl acetate and petroleum ether, or acetonitrile, or aqueous acetonitrile.

L'invention concerne une méthode pour l'isolement de l'antibiotique de l'acide A pseudomonique, de qualité pharmaceutique, dans le bouillon de culture de l'une des espèces du genre de bactéries Pseudomonas productrices d'acide A pseudomonique. La méthode consiste à extraire l'acide A pseudomonique biosynthétisé du bouillon de culture au pH acide au moyen d'un hydrocarbure aliphatique chloré ou d'un acétate d'isobutyle, puis à procéder à une purification. L'invention concerne également des méthodes de purification de l'acide A pseudomonique isolé, qui consistent a) à distribuer le résidu de l'extrait évaporé entre un alcool aqueux et un hydrocarbure aliphatique ou aromatique, puis à extraire la phase enrichie d'alcool aqueux contenant de l'eau au moyen de chlorure de méthylène, d'acétate d'éthyle ou d'acétate d'isobutyle, b) à extraire l'extrait au moyen de bicarbonate d'ammonium, d'hydroxyde alcalin ou d'une solution d'hydroxyde d'ammonium, puis à acidifier l'extrait aqueux alcalin ainsi obtenu et à procédér à une nouvelle extraction au moyen d'un hydrocarbure aliphatique chloré ou d'un acétate d'isobutyle, et c) à concentrer l'extrait et la recristallisation de l'acide A pseudomonique cristallin dans un mélange d'acétate d'isobutyle et d'éther de pétrole ou d'acétonitrile, ou d'acétonitrile aqueux.

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