Abstract
A dual-mode electrochemical biosensor for acetamiprid detection was proposed for the first time based on carbon quantum dots/Prussian blue (CQDs/PB)-functionalized poly(3,4-ethylenedioxythiphene) (PEDOT) nanocomposite. The nanocomposite with spherical stacking nanostructure showed high surface area, excellent catalytic ability, and cycling stability. The biosensor can be effortlessly constructed after the immobilization of acetamiprid aptamer. The concentration of acetamiprid can be determined by differential pulse voltammetry (DPV) based on its signal change deduced from the pristine PB. With the capture of acetamiprid, the response current (I-T) signal generated by hydrogen peroxide catalysis from the biosensor can also been used to establish the method for monitoring acetamiprid. The dual-mode biosensor showed a wide linear range from 10−12 g mL−1 to 10−6 g mL−1, low detection limits of 6.84 × 10−13 g mL−1 and 4.99 × 10−13 g mL−1, and ultrafast detection time of 25 s and 5 s through DPV and I-T mode, respectively. The biosensor possessed excellent selectivity and stability. More importantly, the biosensor was successfully applied to detect acetamiprid residues in vegetables, proving a promising approach for routine detection of pesticide in real samples.
Graphical abstract
The biosensor based on PEDOT/CQDs/PB for acetamiprid can be effortlessly constructed through both the increase of differential pulse voltammetry (DPV) signal change deduced by the pristine PB and the decrease of the response current (I-T) signal of the reduction of hydrogen peroxide catalyzed by PEDOT/CQDs/PB.
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Funding
This work was funded by the National Natural Science Foundation of China (21705088), Shandong Provincial Key R&D Plan (Major Scientific and Technological Innovation Project) (2022CXGC010611, 2022CXGC010401), and Shandong Provincial Peanut Industry Technology System Project (SDAIT-04–09).
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Shang, S., Wang, D. & Wang, J. Electrochemical determination of acetamiprid using PEDOT sensing coating functionalized with carbon quantum dots and Prussian blue nanoparticles. Microchim Acta 189, 341 (2022). https://doi.org/10.1007/s00604-022-05434-y
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DOI: https://doi.org/10.1007/s00604-022-05434-y