The Electrochemical Behavior and Determination of Quercetin in Choline Chloride/Urea Deep Eutectic Solvent Electrolyte Based on Abrasively Immobilized Multi-Wall Carbon Nanotubes Modified Electrode

• Published in: International journal of electrochemical science Vol. 9; no. 1; pp. 238 - 248
• Main Authors: Zheng, Yan, Ye, Liqing, Yan, Lili, Gao, Yuntao
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.01.2014
• Subjects: Choline chloride/urea deep eutectic solvent; Electrode; Electrolyte; Multi-wall carbon nanotubes; Quercetin; Choline chloride/urea deep eutectic solvent; Electrode; Electrolyte; Quercetin; Multi-wall carbon nanotubes
• ISSN: 1452-3981; 1452-3981
• DOI: 10.1016/S1452-3981(23)07712-X

A new electrochemical analysis method, using choline chloride/urea deep eutectic solvents electrolyte and MWNTs modified electrode system has been developed. The electrochemical behavior of quercetin was investigated in the mixed choline chloride/urea deep eutectic solvent electrolyte and acetate buffer solution supporting electrolyte. A pair of redox peak of quercetin was obtained by using cyclic voltammetry in the mixed supporting electrolyte with 0.407 V of Epa and 0.386 V of Epc. A differential pulse voltammeter method (DPV) for the determination of trace quercetin was proposed. A good linear relationship was obtained between the oxidation peak current and the concentration of quercetin within the range from 9.95×10-7 mo1L-1 to 4.76×10-5 moi-L-1, was obtained with the linear regression equation of ipa=526.49-5×108 c (r=0.9991), and the detection limit reach of to 3.6×10-8 moi-L-1. The proposed method was used to determine quercetin in practical samples with the RSD of 1.1 to 1.6% and the percentage recovery of 9.3 to 102.2%, and the result was agreed well that by HPLC.