... Analytical Chemistry, Ruhr University of Bochum, Bochum, D-44780 Germany . ... The results of testing a new enzyme, anionic tobacco peroxidase (TOP), in various amperometric biosensors are summarized. ... As compared to the commonly used cationic peroxidase from horseradish roots, TOP exhibits a wider optimum stability pH range, higher stability to inactivation with hydrogen peroxide, and higher efficiency in direct electron-transfer processes. ...