Fabrication of a novel electrochemical sensor for determination of hydrogen peroxide in different fruit juice samples

Journal of Food and Drug Analysis

Ali Nazari¹  Masoumeh Tabatabaee²  Zahra Shekari³  Navid Nasirizadeh³ 

[1] Department of Art and Architectural, Yazd Branch, Islamic Azad University, Yazd, Iran;Department of Chemistry, Yazd Branch, Islamic Azad University, Yazd, Iran;Scientific Society of Nanotechnology, Yazd Branch, Islamic Azad University, Yazd, Iran;

关键词: amperometry;    electroreduction;    hydrogen peroxide;    reactive blue 19;   

DOI  :  10.1016/j.jfda.2015.06.006

来源: DOAJ

【 摘 要 】

A new hydrogen peroxide (H2O2) sensor is fabricated based on a multiwalled carbon nanotube-modified glassy carbon electrode (MWCNT-GCE) and reactive blue 19 (RB). The charge transfer coefficient, α, and the charge transfer rate constant, ks, of RB adsorbed on MWCNT-GCE were calculated and found to be 0.44 ± 0.01 Hz and 1.9 ± 0.05 Hz, respectively. The catalysis of the electroreduction of H2O2 by RB-MWCNT-GCE is described. The RB-MWCNT-GCE shows a dramatic increase in the peak current and a decrease in the overvoltage of H2O2 electroreduction in comparison with that seen at an RB modified GCE, MWCNT modified GCE, and activated GCE. The kinetic parameters such as α and the heterogeneous rate constant, k', for the reduction of H2O2 at RB-MWCNT-GCE surface were determined using cyclic voltammetry. The detection limit of 0.27μM and three linear calibration ranges were obtained for H2O2 determination at the RB-MWCNT-GCE surface using an amperometry method. In addition, using the newly developed sensor, H2O2 was determined in real samples with satisfactory results.

【 授权许可】

Unknown