期刊
MICROCHIMICA ACTA
卷 188, 期 1, 页码 -出版社
SPRINGER WIEN
DOI: 10.1007/s00604-020-04688-8
关键词
Aptasensor; Chloramphenicol (CAP); PEI-C3N4; AuNWs; Exonuclease; Rapid CAP detection
资金
- National Natural Science Foundation of China [61301037]
- Program for Science and Technology Innovation Talents in Universities of Henan Province [20HASTIT002]
- Cultivation Plan for Young Core Teachers in Universities of Henan Province [2017GGJS072]
- National Engineering Laboratory for Wheat & Corn Further Processing, Henan University of Technology [NL2018004]
The electrochemical aptasensor for CAP detection is based on PEI-C3N4/AuNWs and exonuclease-assistant signal amplification, resulting in a linear relationship and low detection limit, with excellent specificity, reproducibility, and long-term stability.
An electrochemical aptasensor, including the polyethyleneimine-graphite-like carbon nitride/Au nanowire nanocomposite (PEI-C3N4/AuNWs) and exonuclease-assisted signal amplification strategy was constructed for the determination of chloramphenicol (CAP). Initially, a nanocomposite with substantial electrocatalytic property was synthesized by PEI-C3N4/AuNWs. This improves the conductivity and specific surface area of the PEI-C3N4/AuNW-modified gold electrode. Next, a DNA with a complementary sequence to a CAP aptamer (cDNA) was immobilized on the PEI-C3N4/AuNW-modified electrode, followed by the CAP aptamer hybridized with cDNA. The lower signal at this time is due to the negatively charged phosphate group of the oligonucleotide and [Fe (CN)(6)](3-/4-) electrostatically repelling each other. The presence of the CAP would cause aptamer on the electrode surface to fall off and be digested by Recjf exonuclease, which resulted in target recycling, and a significant increase in DPV signal can be observed at a potential of 0.176 V (vs. Ag/AgCl). Under optimal conditions, there is a linear relationship between the peak current and the logarithm of CAP concentration in the range 100 fM-1 mu M, and the detection limit of this aptasensor is 2.96 fM (S/N=3). Furthermore, the resultant aptasensor has excellent specificity, reproducibility, and long-term stability, and has been applied to the detection of CAP in milk samples. The detection principle of the electrochemical aptasensor for CAP detection was based on PEI-C3N4/AuNWs and exonuclease-assistant signal amplification. It is based on the fact that PEI-C3N4/AuNWs nanocomposites on the surface of the electrode can effectively improve the performance of the aptasensor, and Recjf exonuclease initiates the target recycling process, causes signal amplification.
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