| 摘要 |
<p>A streamlined method for purifying alpha-I -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, 5 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 0 high yield on a commercial scale, is also described.</p> |
