A Mesoporous Carbon-Based Amperometric Sensor for Ascorbic Acid Determination

摘要

Using ordered mesoporous carbon (OMC) as the sensing material, an amperometric biosensor forascorbic acid (AA) determination was successfully built on a glassy carbon electrode (GCE). Using amicro-electrochemistry system (MECS), the detection capability of the sensor was evaluated. Comparedwith the results obtained for a bare GCE, the AA oxidation overpotential of the OMC detector decreasedby approximately 800 mV. The electro-catalytic oxidation peak currents had a linear relationship withthe AA concentration over the range of 3.5 × 10 ? 7 - 7 × 10 ? 5 mol/L and a detection limit of 1.5 × 10 ? 7mol/L (S/N = 3). Additionally, the sensor was shown to be interference free and exhibited good stabilityand reproducibility.