[Effect of immobilized noradrenaline on human plasma arginine esterase activated by factor XII].

An attempt to study direct hormonal regulation of the blood coagulating system by catecholamines, using the affinity chromatography method, was made. It was found that human blood plasma is adsorbed and the enzyme hydrolyzing N-benzoyl-L-arginine, is activated on the column. It was found that human blood plasma after the contact with norepinephrine loses its ability to increase the BAEE-esterase activity, when tanic acid, which activates factor XII (Hageman factor), was added.