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 µg/L to 1.0 × 103 µg/L with a determination coefficient of 0.9983. The detection limit of CYF was 0.05 µg/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.
Highlights
Cyfluthrin (CYF), a synthetic type II pyrethroid insecticide, was widely used in agricultural pest control; this insecticide could enter aquatic ecosystems from agricultural areas via run-offs [1,2].CYF residue was frequently detected in aquatic environments and organisms due to its widespread usage and high persistence [3,4]
The corresponding sizes and morphologies of molecularly imprinted polymers (MIPs)-CdSe-quantum dots (QDs) and NIP-CdSe-QDs were characterized by scanning electron microscopy (SEM) and TEM
When the concentration of the molecularly imprinted quantum dots (MIP-QDs) exceeded 15.0 mg/L, the quenching efficiency of the developed molecularly imprinted electrochemiluminescence (MIECL) sensor decreased gradually. These results suggested that the electron transfer resistance conferred by the silica layers upon the surface of the MIP-QDs played a dominant role when excess amounts of MIP-QDs were coated onto the GCE, eventually decreasing quenching efficiency
Summary
Cyfluthrin (CYF), a synthetic type II pyrethroid insecticide, was widely used in agricultural pest control; this insecticide could enter aquatic ecosystems from agricultural areas via run-offs [1,2]. The electrochemical attracted considerable attention from researchers due to its simpler, higher sensitivity, more precise reactions take place redox products of emitters and a co-reactant, generating an excited reaction kinetics, between and betterthe controllability and reproducibility compared with other electroanalytical state detection which might decay[13]. To further improve capability and stability and used as in signal probes recognition elements, respectively, resulting a complex electrode of QDs, this work we and combine molecularly imprinted polymers (MIPs) with in analysis based preparation andselectivity a remarkably negative impact electrical conductivity [22,23]. 2 was used as which were synthesized by functionalizing cadmium selenide quantum dots (CdSe QDs) with a co-reactant, and multiwall carbon nanotubes (MWCNTs) were utilized as reinforcements to provide molecular imprinting polymers as both the signal probe and specific recognition element of the ECL excellent electrocatalytic activity and minimize surface fouling on the electrodes.
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