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Issue 14, 2020
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Rapid determination of the pesticide ametryn based on a colorimetric aptasensor of gold nanoparticles

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Abstract

A new, simple colorimetric aptasensor based on the aggregation-induced color change of citrate-stabilized AuNPs was designed for the specific and sensitive determination of ametryn. Citrate-stabilized AuNPs with negative surface charges were synthesized via an easy one-pot reaction. Because of the electrostatic interaction between the three-nitrogen hybrid ring of ametryn and gold nanoparticles, the citrate-stabilized AuNPs easily undergo aggregation in the presence of ametryn. Thus, with a color change from wine red to gray, ametryn was visually detected by a colorimetric aptasensor. In addition, the detection result can also be measured quantitatively using a UV-vis spectrophotometer. The aptasensor has good selectivity and sensitivity to ametryn in the linear range of 0–80.0 μg L−1. According to the IUPAC criteria (3σ rule), the detection limit of ametryn is 0.15 μg L−1. Moreover, the aptasensor was successfully applied to the detection of ametryn in Yongding River from Zhaocun, Yizhuang Jingkai Sewage Treatment Plant and Yizhuang Nokia Factory water samples. The recovery reached 98.9–101.6%, 95.7–101.3% and 100.0–103.3%, respectively. The excellent performance of the colorimetric aptasensor in the detection of ametryn indicates its potential applications in the detection of ametryn in more complex environmental samples.

Graphical abstract: Rapid determination of the pesticide ametryn based on a colorimetric aptasensor of gold nanoparticles

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Supplementary files

Article information


Submitted
11 Feb 2020
Accepted
16 Mar 2020
First published
17 Mar 2020

Anal. Methods, 2020,12, 1919-1925
Article type
Paper

Rapid determination of the pesticide ametryn based on a colorimetric aptasensor of gold nanoparticles

Y. Qu, H. Qian, Y. Mi, J. He, H. Gao, R. Lu, S. Zhang and W. Zhou, Anal. Methods, 2020, 12, 1919
DOI: 10.1039/D0AY00283F

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