Simultaneous Electrochemical Determination of Isoquercitrin and Epigallocatechingallate at a Carbon Nanotube Electrode

Simultaneous electrochemical determination of isoquercitrin (ISQ) and epigallocatechingallate (EGCG) at a carbon nanotube electrode is presented. The carbon nanotube electrode for ISQ and EGCG sensing has attractive properties in terms of well-defined current peaks, high sensitivity, and high reproducibility. Two well-distinguished anodic peaks +0.23V and +0.38V due to EGCG and ISQ are observed by cyclic voltammetry and those peaks are independent from each other. The linear ranges of ISQ and EGCG are 0.76-94 mu M and 4.0-94 mu M, respectively. The ISO and EGCG values of real sample determined by this method show good agreement with the actual ones. (C) The Electrochemical Society of Japan, All rights reserved.