[Determination of the antiplasmin activity of platelets with a chromogenic substrate].

The synthesis of chromogenic substrate has opened new prospects to the study of haemostasis factors and particularly to the determination of coagulation inhibitors and components of fibrinolysis. In this paper we propose a new and simple method to anti-plasmin activity of platelets, by using H-D-Valyl-L-Leucyl-L-Lysine-p-nitroanilide HCl (S-2251) (Kabi Company, Sweden) as a chromogenic substrate.