Kinetic parameters of Michaelis–Menten equation (Vmax and
Km) for the free and immobilized laccase were tested by measuring
the initial rates of ABTS oxidation over the concentration range of
0.2–1 mM at 25 C in sodium citrate buffer at pH 4.0. Lineweaver–
Burk plot was used to estimate kinetic parameters, and Vmax and
Km were determined from the intercepts at X- and Y-axis of the
plot, respectively.