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[The anticoagulant action of the nitric acid ester of oxidized starch].

The effect of oxidized starch (OS) which contained 15% of COOH groups and its nitroether (NOS) with 4% of nitrogen on coagulation properties of rat blood was studied in vitro and in vivo. The results of the study in vitro showed that OS did not affect the function of the coagulation system. In contrast to OS, a dose-dependent increase in prothrombin-, thrombin time, and activated partial thromboplastin time was observed for NOS. The activity of the components of the internal coagulation pathway changed when the NOS concentration reached 0.1 mg/ml. At a concentration of 0.6 mg/ml and higher this compound affect the external pathway and final stage of coagulation. According to the efficiency (in vitro) of the influence on the thrombine time I mg/ml NOS corresponded to 0.2 U/ml of heparine. The anticoagulant effect of NOS was also observed in vivo along with reliable changes in thromboplastin and thrombin time. Antithrombin activity of plasma remained the same. Standard test was negative and indicated to the absence of fibrin monomers. The pronounced anticoagulant effect of NOS in the experiments in vitro and quick response in the experiments in vivo make it possible to consider this compound as anticoagulant of direct action.