[Method of determining human and animal plasma kallikrein inhibitors].

A method for determining blood plasma kallikrein inhibitors is suggested. It is based on inhibiting the kininogenase activity of kallikrein. The donors' dry plasma devoid of kininases, of other proteolytic enzymes and their inhibitors was used as source and reference of prekallikrein, kallikrein and high-molecular kininogen. Freshly centrifuged plasma was incubated in the presence of unithiol at 37 degrees C in amounts producing a 30-50% inhibition of the kininogenase activity of kallikrein. The values obtained reflected the activity of kallikrein inhibitors and might be of great importance in the study of the physiological role and biochemical properties of kallikrein inhibitors in different animal species, in the diagnosis and prediction of various diseases, as criterion for laboratory control over administering tissue inhibitors of proteolytic enzymes of animal origin.