Grifols, S.a.

Bayer Corporation

David Ownby

Thomas P Zimmerman

Jennifer Audrey Hunt

Charles Miller

Senthil Ranganathan

Tonny Dessources

Wytold R Lebing

Woody D Wood

Mark David Chavez

Susan Trukawinski

Tony Dessources

Described herein are methods for purifying recombinant, cell culture derived alpha-protease inhibitor and removing a colored species that co-purifies with the recA1PI protein. Also described are methods for reducing the iron in cell culture derived alpha-protease inhibitor.

Purification of cell culture derived alpha1 protease inhibitor

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Purification of &agr;-1 proteinase inhibitor (&agr;-1 PI) from aqueous solutions, such as human plasma, is accomplished by precipitation of contaminating proteins from the aqueous solution, followed by dilution of the solution to adjust its conductivity, and passing of the solution through an anion exchange resin. The conductivity of the solution is adjusted so that the &agr;-1 PI binds to the anion exchange resin, while other contaminating proteins and solvent pass through the resin. Further purification may be accomplished by cation chromatography, which takes advantage of the fact that &agr;-1 PI does not bind to the cation column under certain conditions. Some embodiments of the invention also include virus removal and/or inactivation by methods such as nanofiltration and such as contact with a non-ionic detergent. The methods of the present invention result in greater yield, purity, and pathogenic clearance of plasma fractions than known methods.

Method of preparing &agr;-1 proteinase inhibitor

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Clayton, NC, United States of America

David Ownby