Methods of treatment using alpha-1-antitrypsin compositions
US11224643B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 14, 2019 |
| Grant date | Jan 18, 2022 |
| Priority date | — |
| Expiry date | May 24, 2040 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N30/461
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A streamlined method for purifying alpha-1-antitrypsin (AAT) from an AAT-containing protein mixture, such as Coh 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 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 absorbent 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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.