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3,3’4,4’-tetrachlorobiphenyl (PCB77) is a highly toxic substance that endanger ecological environment and human health. In our study, a novel PCB77 electrochemical sensor based on nano-functionalized electrode and selected aptamer was designed. β-cyclodextrin-Au nanoparticles (β-CD-AuNPs)/Nafion modified glassy carbon electrode (GCE) was used for amplify signal that enable sensitivity advanced, and the selected electroactive ferrocene (Fc) labed aptamer was assembled on the electrode surface via the host–guest recognition between βCD and Fc. The detection was carried out according to the signal changed caused by transformation in the configuration of aptamer before and after the existence of PCB77. By this strategy, a detection limit down to 1.6×10-8 g/L was achieved. Moreover, it exhibited reliable selectivity against co-existing chemicals.

A Novel PCB77 Electrochemical Sensor Based on Nano-functionalized Electrode and Selected Aptamer