Method for purification of alpha-1-antitrypsin

B - Operations – Transporting – 01 – D

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B01D 15/08 (2006.01)

Patent

CA 2511986

A streamlined method for purifying alpha-1-antitrypsin (AAT) from an AAT- containing protein mixture, such as a Cohn fraction IV, precipitate, is provided. In the method of the invention, contaminating proteins are destabilized by cleavage of disulfide bonds with a reducing reagent, such as a dithiol, which does not affect AAT. The destabilized proteins are then preferentially adsorbed on a solid protein-adsorbing material, without the addition of a salt as a precipitant. Separation of the solid adsorbent from the solution leaves a purified AAT solution that is directly suitable for chromatographic purification,without the need for extensive desalting as in prior art processes. A process incorporating this method, which provides pharmaceutical grade AAT in high yield on a commercial scale, is also described.

L'invention concerne un procédé simplifié de purification d'antitrypsine alpha-1 (AAT) à partir d'un mélange protéique contenant de l'AAT, tel qu'un précipité de fraction Cohn IV. Dans le procédé selon l'invention, des protéines contaminantes sont destabilisées par clivage de liaisons disulfure à l'aide d'un réactif réducteur, tel qu'un dithiol, lequel n'affecte pas l'AAT. Les protéines destabilisées sont ensuite de préférence adsorbées sur un matériau adsorbant de protéines solide, sans addition d'un sel en tant que précipitant. La séparation de l'adsorbant solide de la solution donne une solution d'AAT purifiée qui est directement utilisable pour la purification chromatographique, sans nécessiter de dessalage extensif tel que dans les procédés de la technique antérieure. L'invention concerne également un traitement faisant appel audit procédé, lequel donne de l'AAT de qualité pharmaceutique avec un rendement élevé à une échelle commerciale.

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