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The kinetics of tyrosinase was studied by using dopa as a substrate. Dopa is converted to dopachrome with absorbs at 475 nm; the molar extinction coefficient of dopachrome is 3700 M-2cm + and the pathlength of the cuvette used was 1 cm. Abs vs time plot showed 0.00069 Absorbance unit/s. The rate of the reaction should be 1.86 E-07 mole/s 1.86E-7 mole/Ls 1.86 E-07 L mole/s 2.553 mol/Ls