In fact, at higher enzyme concentrations, even if the final product concentration (and the overoxidation product ABA) increases, the enlarged amount of enzyme keeps the TON values low. Also, the turnover frequency (TOF=rHEBA/cenzyme) is constant for the first two enzyme concentrations with approx. 9.1 s−1 and decreases at higher enzyme concentrations down to 3.7 s−1.