PPACK TFA is a plasminogen activator (rt-PA) inhibitor. PPACK TFA can inhibit changes in fibrin degradation products, plasminogen and alpha 2-antiplasmin. PPACK TFA also inhibits the binding of rt-PA to plasma protease inhibitors.
References:
[1]. Mohler MA, et al. D-Phe-Pro-Arg-chloromethylketone: its potential use in inhibiting the formation of in vitro artifacts in blood collected during tissue-type plasminogen activator thrombolytic therapy. Thromb Haemost. 1986;56(2):160-164.