AN Jing,XIAO Heng-yue,HE Zhang-jin,et al.Aptamer Electrochemiluminescence Sensor for Sensitive Detection of Chloramphenicol[J].Journal of Instrumental Analysis,2023,42(09):1157-1162.
AN Jing,XIAO Heng-yue,HE Zhang-jin,et al.Aptamer Electrochemiluminescence Sensor for Sensitive Detection of Chloramphenicol[J].Journal of Instrumental Analysis,2023,42(09):1157-1162. DOI: 10.19969/j.fxcsxb.23051803.
Aptamer Electrochemiluminescence Sensor for Sensitive Detection of Chloramphenicol
Positively charged polydienyl dimethyl ammonium chloride(PDDA) and the negatively charged CdS quantum dots(CdS QDs) were adsorbed on the surface of graphene oxide(GO) in order to prepare the graphene-PDDA-quantum dots complex. And modify this complex onto the surface of the electrode. Then capture DNA(cDNA) was assembled on the surface of quantum dots by amide bond,and chloramphenicol aptamer(Apt) was hybridized with cDNA to construct the sensing interface. Finally,hemin embedded in the DNA chain is used to catalyze the oxidation of hydrogen peroxide,resulting in the consumption of co-reactant H,2,O,2, and the decrease of luminous intensity of quantum dots. In the presence of chloramphenicol(CAP),Apt DNA will bind to CAP and detach from the electrode surface,resulting in an increase in the luminous intensity of quantum dots,thus achieving sensitive and specific detection. In the CAP concentration range of 1.0×10,-10,-1.0×10,-6 ,mol/L,the sensor has a good detection signal,the ECL intensity is linearly correlated with the logarithm of CAP concentration,and the detection limit is 3×10,-11 ,mol/L. The sensor has excellent repeatability,stability and specificity. Finally,the sensor has been applied to the determination of CAP residues in real milk samples with satisfactory results. The rapid and simple sensor detection technology of CAP will have a good application prospect in the fields of food safety and environmental monitoring.
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