Fabrication of a Disposable Amperometric Sensor for the Determination of Nitrite in Food

Silver nanoparticles (AgNPs) were synthesized through an environmentally friendly method with tea extract as a reduction agent. By immobilizing them on the surface of a low-cost pencil graphite electrode (PGE) with the aid of a simple and well-controlled in-situ electropolymerization method, a novel...

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Bibliographic Details
Published in:Micromachines (Basel) 2023-03, Vol.14 (3), p.687
Main Authors: Liu, Chao, Chen, Daoming, Zhu, Chunnan, Liu, Xiaojun, Wang, Yu, Lu, Yuepeng, Zheng, Dongyun, Fu, Baorong
Format: Article
Language:English
Subjects:
Carbon
Electric properties
Electrical measurement
Electrochemical analysis
Electrodes
Food
green synthesis
Methods
Microscopy
Nanoparticles
nitrite
Optical properties
Oxidation
pencil graphite electrode
Phenols
Photoelectrons
Polymerization
Polymers
Polyphenols
Reproducibility
Response time
Selenium
Sensitivity
Sensors
Severe acute respiratory syndrome coronavirus 2
Silver
silver nanoparticles
Spectrum analysis
tea polyphenols
Voltammetry
Wire
Work stations
X-ray spectroscopy
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Summary:Silver nanoparticles (AgNPs) were synthesized through an environmentally friendly method with tea extract as a reduction agent. By immobilizing them on the surface of a low-cost pencil graphite electrode (PGE) with the aid of a simple and well-controlled in-situ electropolymerization method, a novel nanosensing interface for nitrite was constructed. The film-modified PGE showed good electrocatalytic effects on the oxidation of nitrite and was characterized through scanning electron microscopy, X-ray photoelectron spectroscopy, and electrochemical techniques. Characterization results clearly show that the successful modification of AgNPs improved the surface area and conductivity of PGEs, which is beneficial to the high sensitivity and short response time of the nitrite sensor. Under the optimal detection conditions, the oxidation peak current of nitrite had a good linear relationship with its concentration in the range of 0.02-1160 μmol/L with a detection limit of 4 nmol/L and a response time of 2 s. Moreover, the sensor had high sensitivity, a wide linear range, a good anti-interference capability, and stability and reproducibility. Additionally, it can be used for the determination of nitrite in food.
ISSN:2072-666X
2072-666X
DOI:10.3390/mi14030687