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Sensors 2019, 19(2), 268; https://doi.org/10.3390/s19020268

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

1
Key Laboratory of Ecology of Rare and Endangered Species and Environmental Protection (Guangxi Normal University), Ministry Education, Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology, Guilin 541004, China
2
School of Life and Environmental Sciences, Guilin University of Electronic Technology, Guilin 541004, China
3
Department of Physical and Environmental Sciences, University of Toronto Scarborough, Toronto, ON M1C 1A4, Canada
*
Authors to whom correspondence should be addressed.
Received: 5 December 2018 / Revised: 3 January 2019 / Accepted: 8 January 2019 / Published: 11 January 2019
(This article belongs to the Section Biosensors)
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Abstract

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 μmol·L−1 and with 0.3 μmol·L−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. View Full-Text
Keywords: electrochemical sensor; nitrite; ferrocenoyl cysteine; screen-printed electrode; disposable electrochemical sensor; nitrite; ferrocenoyl cysteine; screen-printed electrode; disposable
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Feng, X.-Z.; Ferranco, A.; Su, X.; Chen, Z.; Jiang, Z.; Han, G.-C. A Facile Electrochemical Sensor Labeled by Ferrocenoyl Cysteine Conjugate for the Detection of Nitrite in Pickle Juice. Sensors 2019, 19, 268.

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