Factor VIII/vWF-complex and methods of purifying same
There is disclosed a method of recovering factor VIII/vWF-complex which is characterized in that factor VIII/vWF-complex from a protein solution is bound to a cation exchanger and is recovered by step-wise elution of factor VIII/vWF-complex, which particularly contains high-molecular vWF multimers, as well as a factor VIII/vWF-complex obtainable by means of cation exchange chromatography.
1. An isolated protein fraction comprising Factor VIII:C that is free of measurable platelet agglutinating vWF activity, as determined by measuring vWF:Risto-CoF activity, wherein the protein fraction is obtained from a Factor VIII/vWF-containing solution by cation exchange chromatography and step-wise elution at a salt concentration of between >200 mM and <300 mM, and wherein the Factor VIII/vWF-containing solution is a cryoprecipitate, a supernatant, or an extract of a recombinant cell culture.
2. A preparation comprising the Factor VIII:C of claim 1 , wherein said preparation is virus safe and free from infectious material.
3. The preparation of claim 2 , wherein said preparation is present in storage-stable form.
4. The preparation of claim 2 , wherein said preparation is formulated in a buffer.
5. A method of treating patients suffering from Hemophilia A, Phenotypic Hemophilia or von Willebrand Disease (vWD), comprising administering to said patients an effective amount of the Factor VIII:C of claim 1 .