A molecularly imprinted electrochemical sensor based on Au nanocross-chitosan composites for detection of paraquat
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A novel electrochemical sensor for paraquat (PQ) detection based on molecularly imprinted polymer (MIP) membranes on a glassy carbon electrode (GCE) modified with Au nanocrosses-chitosan (AuNCs-CS) was constructed. P-Aminothiophenol (p-ATP) and 4,4′-bipyridine template were assembled on the surface of the modified GCE by the formation of Au–S bonds and hydrogen-bonding interactions, followed by polymer membrane formation by the electropolymerization in a polymer solution containing p-ATP, HAuCl4, tetrabutylammonium perchlorate (TBAP), and the template molecule 4,4′-bipyridine. The as-constructed molecularly imprinted sensor (MIP-AuNC-CS) was characterized by differential pulse voltammetry (DPV), transmission electron microscopy (TEM), and scanning electron microscopy (SEM). This is the first time that molecularly imprinted polymer technology has been integrated with a modified AuNCs-CS to electrochemically detect PQ. The linear response of the MIP-AuNC-CS sensor was in the range from 1 × 10−14 to 1 × 10−10 mol L−1, and the limit of detection was 2.3 × 10−15 mol L−1. This sensor showed high-speed real-time detection capability, low sample consumption, high sensitivity, low interference, and good stability characteristics, and was proven to detect PQ.
KeywordsParaquat Au nanocrosses Chitosan Molecularly imprinted polymer Electrochemical sensor Differential pulse voltammetry
This work has been supported by the National Research Program of China (CX173007) and the National First-class Discipline Program of Food Science and Technology (No. JUFSTR20180303).
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Conflict of interest
The authors declare that they have no conflict of interest.
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