[Production of a fibrinogen concentrate from small amounts of human autologous blood plasma and its short-term characteristics].

Simple procedure was developed for production of fibrinogen concentrate from small amounts of human autogenous blood using precipitation with polyethylene glycol and ammonium sulfate. Maximal yield of fibrinogen was obtained using polyethylene glycol 2,000 and 6,000 daltons at concentrations 7% and 4.5%, respectively.

[Temperature effect on the conformation state of fibrinogen and its derivatives].

The temperature dependence of spectral parameter B for fibrinogen, monomer fibrin, D and E fragments is examined by the method of ultraviolet fluorescence. Besides denaturation transition I (49 degrees C), conformational transition II (11-16 degrees C, depending on the sample) is observed in fibrinogen and its D fragment when temperature changes from 2 to 56 degrees C. Temperature transition II is reversible, sensitive to the ionic strength (its rise causes the transition temperature drop).