Highly Selective Electrochemiluminescence Sensor Based on Molecularly Imprinted-quantum Dots for the Sensitive Detection of Cyfluthrin

Authors :: Xizhi Shi
Jin-Jin Xu
Jiong Chen
Aili Sun
Ze-Ming Zhang
Zhang Rongrong
Liu Chenxi
Source :: Sensors (Basel, Switzerland), Sensors, Volume 20, Issue 3, Sensors, Vol 20, Iss 3, p 884 (2020)
Publication Year :: 2020
Publisher :: MDPI, 2020.
Abstract: A highly selective and sensitive molecularly imprinted electrochemiluminescence (MIECL) sensor was developed based on the multiwall carbon nanotube (MWCNT)-enhanced molecularly imprinted quantum dots (MIP-QDs) for the rapid determination of cyfluthrin (CYF). The MIP-QDs fabricated by surface grafting technique exhibited excellent selective recognition to CYF, resulting in a specific decrease of ECL signal at the MWCNT/MIP-QD modified electrode. Under optimal conditions, the MIECL signal was proportional to the logarithm of the CYF concentration in the range of 0.2 &micro<br />g/L to 1.0 &times<br />103 &micro<br />g/L with a determination coefficient of 0.9983. The detection limit of CYF was 0.05 &micro<br />g/L, and good recoveries ranging from 86.0% to 98.6% were obtained in practical samples. The proposed MIECL sensor provides a novel, rapid, high sensitivity detection strategy for successfully analyzing CYF in fish and seawater samples.

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