Stable intermediates in kinetic models of catalase action

The peroxidatic model of catalase action (A) and one of its extensions (C) are discussed. A mathematical relation between the final concentration of the intermediate of model A and the initial peroxide concentration is derived. It is shown that the steady-state concentration is the upper limit of the possible final concentrations of the intermediate complex. In case C, which is a consecutive two-complex system, the first complex disappears at the end of the reaction while the second complex persists at infinite time. The terminal concentration of this complex may vary, depending on initial conditions and on the rate constants, between zero and the total enzyme concentration. Some aspects of the models relative to catalase kinetics are discussed.