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.
Highlights
Nitrite is a good antimicrobial agent for the prevention of fresh meat and fish products from natural degradation in food preservation [1]
Nitrite can interact with amines or the amino acids of proteins, especially in cured meat, to form toxic and carcinogenic nitrosamines that may lead to gastrointestinal tumors and stomach cancer [2]
All the results showed that nitrite oxidation possessed a lower overpotential electrodes, which was (A) on Fc-ECG/screen-printed electrodes (SPEs) sensor than other modified (B)
Summary
Nitrite is a good antimicrobial agent for the prevention of fresh meat and fish products from natural degradation in food preservation [1]. High concentrations of nitrite in the human body increases the irreversible oxidation of hemoglobin to methemoglobin, which limits the oxygen loading ability of the blood and is hazardous to human health [3]. It is a big world problem that nitrite contamination of drinking water in reservoirs and aquifers directly influence human health, which are contributed by agricultural fertilizers and manure. Several methods have been employed for nitrite detection, such as chromatography [6], spectrophotometry [7], capillary electrophoresis [8], chemiluminescence [9], colorimetry [10], fluorescence
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
