Heating of Double Coldprecipitated Factor VIII Concentrate from Heparinized Plasma
Factor VIII (FVIII) concentrates have been produced from heparinized plasma by double coldprecipitation. In clinical trials these FVIII concentrates have showed normal FVIII recovery and half-life in stable hemophiliac patients, and good hemostatic effect during acute surgical procedures in hemophiliac patients. It is a high-yielding (50%) freeze-dried product with specific activity of 0.5 to 0.8. Most of its protein content is due to fibrinogen and fibronectin . Repeated exposure to FVIII concentrate carries the potential risk of virus infections such as hepatitis. Despite the fact that our product is derived from small pools  the recent publicity on HTLV III and AIDS has necessitated the introduction of a virus inactivation procedure on this material . Heating was chosen since it is easily adaptable to our system. HTLV III seems to be exquisitely sensitive to heating at 56°G in the liquid stage . Dry heating is also effective but requires a longer time and higher temperature, for instance 68°C for 24–48 hours [5,6], although 60°C for 10–30 hours may also be effective for dried FVIII concentrates [7,8].
KeywordsFactor Viii Virus Inactivation HEPARINIZED Plasma Acute Surgical Procedure FVIII Activity
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