Influence of flavonoids and lanthanides on kappa-carrageenin rat tail thrombosis.

Rat tail thrombosis (RTT) induced by i.v. injection of kappa-carrageenin was not inhibited by p.o. or i.p. administration of the aglucon of rutin, quercetin, but it was slightly inhibited by rutoside-containing Venoruton. The RTT was significantly inhibited by didymlaevulinate, Helodym 88, whereas samarium-containing Phlogosol gave inconsistent results because of the solvent propylene glycol. The RTT model is suitable to detect substances of the flavonoid and lanthanide types with weak antithrombotic activity.