Catalysis kinetics characterization of douchi fibrinolytic enzyme(DFE)is studied.The results show that:the relative molecular weight is 41 970
the optimal reaction pH is pH7.0
DFE’s activity is the stablest at the pH range of 78
relatively stable at the pH range of 8-10
0 under the pH 4;the optimal reaction comperature is 41 ℃
enzyme activity is higher at the comperature range of 37-45 ℃;the stability of conservation is best at 15 ℃;Hg2+could remarkably inhibit DFE’s activity
Fe3+and Li+ could enhance it.When casein is used as a substrate
the reaction catalyzed by DFE is inhibited by the substrate.