ELECTROCHEMICAL BEHAVIOR AND SIMULTANEOUS DETERMINATION OF VITAMIN B₂, B₆, AND C AT ELECTROCHEMICALLY PRETREATED GLASSY CARBON ELECTRODE

Abstract

An electrochemically pretreated glassy carbon electrode (PGCE) was achieved by anodic oxidation at 1.8V and following potential cycling in the potential range from −0.8 to +1.0 V. The resulting PGCE gave well-defined redox peaks with E _pa= −0.073 V, E _pc = 0.044 V. The PGCE showed good activity in improving the electrochemical responses of some water-soluble Vitamins, such as Vitamin (VB₂), Vitamin (VB₆) and Vitamin (VC). VB₂, VB₆ could be adsorbed at PGCE and VC proceeded with an electrocatalytic process. The electrochemical behavior of VB₆ at PGCE depended on the potential scanning method and the pretreatment process of the electrode. The PGCE was rather stable and can be used to simultaneously determine these vitamins in multivitamin tablets.

Keywords:

• Vitamin B₂
• Vitamin B₂
• Vitamin C
• Electrochemically pretreated GCE
• Simultaneous determination

ACKNOWLEDGMENTS

This project was supported by the National Science Foundation of China (No. 29835710, 20075010).