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sensitivity can be attributed to chemical amplification due to the cycling of the substrate caused by enzymatic oxidation and following electrochemical regeneration. In case of HGA, the obtained sensitivity is 53 nA/ µM with linear range of 1-50 µM (r 2 = 0.999) and detection limit of 0.3 µM. The response times (t90%) are about 2 seconds for the two substrates and the long-term stability is 60 days for HQ and around 40-50 days for HGA with retaining 80% of initial activities. The very fast response and the durable long-term stability are the principal advantages of this sensor. pH studies show that optimal pH of the sensor for HQ is 6.0 and that for HGA is 4.5-5.0. This shift of optimal pH towards acidi c range for HGA can be attributed to the balance between enzyme activity and accessibility of the substrate to the active site of the enzyme.

Amperometric Detection of Hydroquinone and Homogentisic Acid with Laccase Immobilized Platinum Electrode