Fig. 8From: Andrographolide sodium bisulphite-induced inactivation of urease: inhibitory potency, kinetics and mechanismReactivation of ASB-inactivated urease by L-cys or DTT. Activity of urease inactivated by ASB (blue line) and after adding L-cys (yellow) or DTT (purple). Urease was inactivated by 4Â mM ASB, and 4Â mMÂ L-cys or DTT was added into the reaction system 20Â min later (as indicated by the vertical arrow)Back to article page