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Article

Mesoporous CoOx/C Nanocomposites Functionalized Electrochemical Sensor for Rapid and Continuous Detection of Nitrite

by
Xuhua Dong
1,
Siqi Xie
1,
Jingyang Zhu
1,
Haiquan Liu
1,
Yong Zhao
1,
Tianjun Ni
2,*,
Long Wu
3,* and
Yongheng Zhu
1,*
1
Laboratory of Quality & Safety Risk Assessment for Aquatic Products on Storage and Preservation (Shanghai), College of Food Science and Technology, Ministry of Agriculture and Shanghai Engineering Research Center of Aquatic-Product Processing & Preservation Shanghai Ocean University, Shanghai 200120, China
2
School of Basic Medicine, Xinxiang Medical University, Xinxiang 453003, China
3
National “111” Center for Cellular Regulation and Molecular Pharmaceutics, Key Laboratory of Fermentation Engineering (Ministry of Education), College of Bioengineering and Food, Hubei University of Technology, Wuhan 430068, China
*
Authors to whom correspondence should be addressed.
Coatings 2021, 11(5), 596; https://doi.org/10.3390/coatings11050596
Submission received: 26 April 2021 / Revised: 11 May 2021 / Accepted: 14 May 2021 / Published: 18 May 2021
(This article belongs to the Special Issue Advanced Luminescent Materials: Properties and Applications)
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Abstract

Nitrite is widespread in the environment, and is frequently used as an additive to extend the shelf life of meat products. However, the excess intake of nitrite can be harmful to human health. Hence, it is very important to know and control the content of nitrite in foodstuffs. In this work, by the means of self-assembly induced by solvent evaporation, we used the amphiphilic PEO-b-PS diblock copolymers resol and cobalt nitrate as a template to synthesize ordered mesoporous CoOx/C nanocomposites. Then, the CoOx/C nanocomposites were modified on a glassy carbon electrode (GCE), which showed excellent sensitivity, good selectivity, and a wide detection range for nitrite. Through cyclic voltammetry and current–time techniques, the electrochemical performance of the GCE modified with CoOx/C nanocomposites was analyzed. Under the optimized conditions, we found that anodic currents were linearly related to nitrite concentrations with a regression equation of lp (µA) = 0.36388 + 0.01616C (R2 = 0.9987) from 0.2 µM to 2500 µM, and the detection limit was 0.05 µM. Furthermore, the electrochemical sensor behaved with high reproducibility and anti-interference ability towards various organic and inorganic ions, such as NO3−, SO42−, Cl−, COOH− (Ac−), Na+, K+, Mg2+, and NH4+. Our results indicated that these CoOx/C nanocomposites could be applied in electrochemical sensors for the rapid and sensitive detection of the food preservative nitrite.
Keywords: nitrite; cobalt nanoparticles supported on ordered mesoporous carbon nanocomposites; electrochemical sensors nitrite; cobalt nanoparticles supported on ordered mesoporous carbon nanocomposites; electrochemical sensors
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MDPI and ACS Style

Dong, X.; Xie, S.; Zhu, J.; Liu, H.; Zhao, Y.; Ni, T.; Wu, L.; Zhu, Y. Mesoporous CoOx/C Nanocomposites Functionalized Electrochemical Sensor for Rapid and Continuous Detection of Nitrite. Coatings 2021, 11, 596. https://doi.org/10.3390/coatings11050596

AMA Style

Dong X, Xie S, Zhu J, Liu H, Zhao Y, Ni T, Wu L, Zhu Y. Mesoporous CoOx/C Nanocomposites Functionalized Electrochemical Sensor for Rapid and Continuous Detection of Nitrite. Coatings. 2021; 11(5):596. https://doi.org/10.3390/coatings11050596

Chicago/Turabian Style

Dong, Xuhua, Siqi Xie, Jingyang Zhu, Haiquan Liu, Yong Zhao, Tianjun Ni, Long Wu, and Yongheng Zhu. 2021. "Mesoporous CoOx/C Nanocomposites Functionalized Electrochemical Sensor for Rapid and Continuous Detection of Nitrite" Coatings 11, no. 5: 596. https://doi.org/10.3390/coatings11050596

APA Style

Dong, X., Xie, S., Zhu, J., Liu, H., Zhao, Y., Ni, T., Wu, L., & Zhu, Y. (2021). Mesoporous CoOx/C Nanocomposites Functionalized Electrochemical Sensor for Rapid and Continuous Detection of Nitrite. Coatings, 11(5), 596. https://doi.org/10.3390/coatings11050596

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