[Plasmin in human blood plasma]

Formation of plasmin was studied when treating the human diluted blood plasma with kaolin in acid medium. The activity of the formed enzyme was determined quantitatively from the splitting of protamin sulphate, fibrin and fibrinogen. Dependence of plasminogen activation on time of plasma incubation with kaolin and on temperature as well as the effect of proteinases inhibitors on the plasmin activity are studied.