Summary
In an attempt to implement the small pool concept in Factor VIII purification, cryoprecipitate derived from heparinised plasma was reprecipitated in the cold providing a factor VIII concentrate for freeze drying and heat treatment. There was considerable purification; only 1% of the original plasma proteins was left in the final product. Factor VIII: C concentration was about 19 IU/ml. Factor VIII related antigen (RAg) appeared heterogeneous, with a broad base and asymmetry on crossed immunoelectrophoresis. Fibrinogen content was 15 g/l. In contrast to high-purity commercial concentrates, fibronectin was considerably concentrated. Immunoglobulin contents were similar to a high-purity commercial product. The amount of other plasma proteins was very small, varying from less than 0.2% for C 3 complement to 2.3% ceruloplasmin. In some respects the preparation may be considered as an intermediate-purity Factor VIII concentrate. Following addition of 2% sucrose before freeze drying, Factor VIII, total protein and fibrinogen remain virtually stable (less than 15% loss) during heating of the material to 60, 64 or 68°C for 24 to 72 h without changes of protein spectrum following heating. The heated product when stored at 4°C remains stable for at least 3 months. In two severe haemophiliacs receiving this heat treated product, in vivo Factor VIII recovery was 100% with a mean half life of 10.2 h.
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Smit Sibinga, C., Schulting, P.J., Notebomer, J. et al. Double cryoprecipitated factor VIII concentrate from heparinised plasma and its heat treatment. Blut 56, 111–116 (1988). https://doi.org/10.1007/BF00320015
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DOI: https://doi.org/10.1007/BF00320015