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Thromb Haemost 1961; 6(02): 224-234
DOI: 10.1055/s-0038-1654555
Originalarbeiten — Original Articles — Travaux Originaux
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The Formation of Intermediate Product I in a Purified System The Role of Factor IX or of its Precursor and of a Hageman Factor-PTA Fraction

E. T Yin
1   Coagulation Laboratory (Prof. F. Koller) of the Department of Medicine (Prof. P. H. Rossier) Kantonsspital, University of Zürich, Switzerland
,
F Duckert
1   Coagulation Laboratory (Prof. F. Koller) of the Department of Medicine (Prof. P. H. Rossier) Kantonsspital, University of Zürich, Switzerland
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12. Juli 2018 (online)

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Summary

1. The role of two clot promoting fractions isolated from either plasma or serum is studied in a purified system for the generation of intermediate product I in which the serum is replaced by factor X and the investigated fractions.

2. Optimal generation of intermediate product I is possible in the purified system utilizing fractions devoid of factor IX one-stage activity. Prothrombin and thrombin are not necessary in this system.

3. The fraction containing factor IX or its precursor, no measurable activity by the one-stage assay method, controls the yield of intermediate product I. No similar fraction can be isolated from haemophilia B plasma or serum.

4. The Hageman factor — PTA fraction shortens the lag phase of intermediate product I formation and has no influence on the yield. This fraction can also be prepared from haemophilia B plasma or serum.

 

  • References

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