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Sensors 2018, 18(5), 1595; https://doi.org/10.3390/s18051595

Visual and Colorimetric Sensing of Metsulfuron-Methyl by Exploiting Hydrogen Bond-Induced Anti-Aggregation of Gold Nanoparticles in the Presence of Melamine

1
Quality and Safety Risk Assessment Laboratory for Sugar Crops Products, the Ministry of Agriculture, Heilongjiang University, Harbin 150080, China
2
Key Laboratory of Vegetables Quality and Safety Control, Institute of Vegetables and Flowers, Chinese Academy of Agricultural Sciences, Ministry of Agriculture of China, Beijing 100081, China
3
Key Laboratory of Agrifood Safety and Quality, Institute of Quality Standard and Testing Technology for Agro Products, Chinese Academy of Agricultural Sciences, Ministry of Agriculture of China, Beijing 100081, China
*
Authors to whom correspondence should be addressed.
Received: 20 April 2018 / Revised: 11 May 2018 / Accepted: 15 May 2018 / Published: 17 May 2018
(This article belongs to the Section Chemical Sensors)
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Abstract

Various highly sensitive and selective analytical methods have been used to monitor metsulfuron-methyl residue in the environment. However, these methods involve costly instruments and complex, time-consuming operations performed in laboratories. Here, a rapid, convenient, and sensitive colorimetric sensor based on anti-aggregation of gold nanoparticles (AuNPs) is demonstrated for the rapid detection of metsulfuron-methyl in agricultural irrigation water. The AuNPs could be induced to aggregate in the presence of melamine and exhibited a distinct color change from wine-red to blue. The aggregation was suppressed by a strong hydrogen-bonding interaction between metsulfuron-methyl and melamine. The differences of the absorbance at 523 nm (ΔA523) and the color change was linearly related to metsulfuron-methyl concentration over the range 0.1–100 mg/L, as observed visually and by UV-vis (Ultraviolet-visible) spectrometry. The detection limit of the sensor was as low as 0.05 mg/L (signal/noise = 3), and was used to determine metsulfuron-methyl in spiked water and in agricultural irrigation water samples. Recoveries were in the range of 71.2–100.4%, suggesting that the colorimetric sensor was suitable for the determination of metsulfuron-methyl in agricultural water samples. View Full-Text
Keywords: colorimetric sensor; gold nanoparticle; anti-aggregation; metsulfuron-methyl; melamine; agricultural irrigation water colorimetric sensor; gold nanoparticle; anti-aggregation; metsulfuron-methyl; melamine; agricultural irrigation water
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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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Liu, G.; Zhang, R.; Huang, X.; Li, L.; Liu, N.; Wang, J.; Xu, D. Visual and Colorimetric Sensing of Metsulfuron-Methyl by Exploiting Hydrogen Bond-Induced Anti-Aggregation of Gold Nanoparticles in the Presence of Melamine. Sensors 2018, 18, 1595.

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