Factor VIII separation

Chemistry: electrical and wave energy – Processes and products – Electrophoresis or electro-osmosis processes and electrolyte...

Reexamination Certificate

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Details

C204S450000, C204S518000, C204S600000, C204S627000

Reexamination Certificate

active

07144487

ABSTRACT:
The claims describe methods for isolating functionally active Factor VIII using a membrane-based separation system containing a separation membrane to create a first and second interstitial volume between at least two restriction membranes. One or more stabilizing agents are added to the sample and/or an interstitial volume. A solvent in the first interstitial volume maintains FVIII in a desired charge state. Applying a potential between the first and second interstitial volumes separates FVIII on one side of the separation membrane from unwanted molecules on the other side of the separation membrane. These methods may also be used as a substitute for one or more steps in a conventional purification scheme for the separation of native or recombinant FVIII.

REFERENCES:
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patent: 5039386 (1991-08-01), Margolis
patent: 6270672 (2001-08-01), Turecek et al.
patent: 2096174 (1982-10-01), None
patent: WO 79/00299 (1979-05-01), None
Fatouros, A. et al., “Recombinant Factor VIII SQ—Inactivation Kinetics in Aqueous Solution and the Influence of Disaccharides and Sugar Alcohols” Pharm. Res. 14, 1679-1684. (1997).
Balague, C. et al., “Sustained high-level expression of full-length human factor VIII and restoration of clotting activity in hemophilic mice using a minimal adenovirus vector” Blood. 95 (3) 820-828. (2000).
Wikipedia entry for albumin, from “Albumin: Definition and Much More From Answers.com”, available at http://www.answers.com/albumin. Dec. 2005, 1 page.
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Medline abstract Accession No. 82046802 (PubMed ID: 6794637) & Perret BA, et al., “Fractionation of individual, biologically active Factor VIII multimers”, Biochimica et Biophysica ACTA, Jun. 29, 1981, 669 (1), 98-104. Abstract.
Bidwell E., et al., “Experiments with Factor VIII separated from fibrinogen by electrophoresis in free buffer film”, Chemical Abstract Accession No. 65:91977, Brit. J. Kaematol, 1996, 12 (5), 583-94. Abstract.

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