Voltammetric Study of Vitamin K3 at Interdigitated Array Microelectrodes

Abstract

Cyclic voltammetry of Vitamin K3 (VK3) was measured with Pt disk electrode, platinum interdigitated array (Pt-IDA) and Au-IDA microelectrodes in single and dual modes. The effects of pH, scan rate and collector potential on the current of generator and collector were studied. The collection efficiency of VK3 at IDA electrodes was measured. The linear ranges for current response as a function of VK3 concentration were found to be 10μM–1 mM (ig) and 1μM–1mM (ic) for the generator and collector of the Pt-IDA electrode, respectively. The effects of waiting time, potential difference and pulse electrolysis time in differential pulse voltammetry (DPV) on the peak current of VK3 were studied to get the optimal condition at 0.1M Na2HPO4, pH 11.50 and 11.0 for Au-IDA and Pt-IDA, respectively.