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We developed a simple, label-free, DNAzyme-based electrochemical impedance sensor for highly sensitive detection of Cu 2+ ions in aqueous solution. A complex of Cu 2+ -dependent DNAzyme and its corresponding substrate was immobilized on the gold electrode surface though Au-S bond. In the presence of Cu 2+ ions, the cleavage of DNAzyme resulted in a significant change in the charge transfer resistance signal intensity. The resistance signal change correlated with the concentration of Cu 2+ ions. The proposed sensor showed excellent sensitivity and selectivity. The limit of detection of this sensor is 5 nM, which is far below the limit of Cu 2+ ions (~ 20 μM) mandated by United States Environmental Protection Agency (EPA). A series of metal ions, such as Ca 2+ , Mg 2+ , Mn 2+ , Cr 3+ , Pb 2+ , Zn 2+ , Co 2+ , and Ni 2+ , have little interference with the detection of Cu 2+ ions.

A DNAzyme-based Electrochemical Impedance Biosensor for Highly Sensitive Detection of Cu2+ Ions in Aqueous Solution