A Facile Electrochemical Sensor Labeled by Ferrocenoyl Cysteine Conjugate for the Detection of Nitrite in Pickle Juice

作者：Feng, Xiao-Zhen; Ferranco, Annaleizle; Su, Xiaorui; Chen, Zhencheng; Jiang, Zhiliang^*; Han, Guo-Cheng^*

来源：Sensors (Switzerland), 2019, 19(2): 268.

DOI：10.3390/s19020268

• electrochemical sensor
• nitrite
• ferrocenoyl cysteine
• screen-printed electrode
• disposable

Simple and facile electrochemical sensors for nitrite detection were fabricated by directly depositing ferrocenoyl cysteine conjugates Fc[CO-Cys(Trt)-OMe](2) [Fc(Cys)(2)] or Fc[CO-Glu-Cys-Gly-OH] [Fc-ECG] on screen-printed electrodes (SPEs). The modified carbon electrodes were characterized by scanning electron microscopy (SEM), cyclic voltammetry (CV) and differential pulse voltammetry (DPV). Results indicated that Fc-ECG/SPE sensor showed enhanced current response and a lower overpotential than Fc(Cys)(2)/SPE sensor for nitrite detection. Optimal operating conditions were estimated for nitrite detection by DPV. The concentration of nitrite showed a good linear relationship with the current response in the range of 1.0-50 molL(-1) and with 0.3 molL(-1) as the concentration for limit of detection. There were no interferences from most common ions. The development of this electrochemical sensor was used for nitrite detection in pickled juice with a R.S.D. lower than 2.1% and average recovery lower than 101.5%, which indicated that disposable electrochemical sensor system can be applied for rapid and precise nitrite detection in foods.

• 出版日期2019-1-2
• 单位桂林电子科技大学; 广西师范大学