FU Cheng-xiang,DUAN Xiao-ge,SHI Xin-rui,ZHAO Zhi,HE Zhao-yuan,QIU Jie-ke,LUO Ya-xiang,MENG Shu-ling,CHEN Hai-lan.Development of Impedance Type Label-free Electrochemical Aptamer Sensor for Chloramphenicol Residue Detection[J].Journal of Instrumental Analysis,2025,44(07):1420-1425.
In order to develop an electrochemical aptamer sensor for the sensitive detection of chloramphenicol(CAP),the label-free sulfhydryl-modified CAP-specific aptamer(Apt) was immobilized on the surface of the gold electrode through Au-S bonding. The sensitivity,specificity,and reproducibility of the sensor were investigated by electrochemical impedance spectroscopy(EIS),and the spiking tests were carried out using milk as the substrates. The results showed that the EIS response of the electrochemical aptamer sensor to CAP showed a good linear relationship in the range of 1-100 ng/mL,and the limit of detection(LOD) was 0.95 ng/mL. At the same time,the responses of the sensor to florfenicol(FFC),sulfadiazine(SDZ),and gentamicin(GEN) were significantly lower than that to CAP,indicating that the sensor had high selectivity. Furthermore,the EIS response of the sensor to CAP was still 90.06% of the initial signal after 14 days. With a relative standard deviation(RSD) of 3.7% for five electrodes prepared under the same conditions,the sensor exhibited good reproducibility and stability. The spiked recoveries in milk were 95.8%-111%,with RSD not more than 5.6%. It indicated that the established sensor could be used for the sensitive detection of CAP,which provided technical support and theoretical basis for the rapid and sensitive detection of CAP residues in animal-derived foods.
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