2.12. Determination of Km and Vmax
Different concentrations of soluble potato starch (0–10 mg/ml)
in sodium acetate buffer (30 mM, pH 5.0) were incubated with
the purified enzyme for 3 min at 70 C, and the activities were
measured using the DNS method. Initial velocities (V0) were determined
at all substrate concentrations, and the Km and Vmax values
were calculated using a double reciprocal plot.