Ultrasensitive and selective electrochemical biosensor for detection of mercury (II) ions by nicking endonuclease-assisted target recycling and hybridization chain reaction signal amplification

In this paper, a novel and signal-on electrochemical biosensor based on Hg 2+ - triggered nicking endonuclease-assisted target recycling and hybridization chain reaction (HCR) amplification tactics was developed for sensitive and selective detection of Hg 2+ . The hairpin-shaped capture probe A (PA) contained a specific sequence which was recognized by nicking endonuclease (NEase). In the presence of Hg 2+ , probe B (PB) hybridized with PA to form stand-up duplex DNA strands via the Hg 2+ mediated thymine-Hg 2+ -thymine (T-Hg 2+ -T) structure, which automatically triggered NEase to selectively digest duplex region from the recognition sites, spontaneously dissociating PB and Hg 2+ and leaving the remnant initiators. The released PB and Hg 2+ could be reused to initiate the next cycle and more initiators were generated. The long nicked double helices were formed through HCR event, which was triggered by the initiators and two hairpin-shaped signal probes labeled with methylene blue , resulting in a significant signal increase. Under optimum conditions, the resultant biosensor showed the high sensitivity and selectivity for the detection of Hg 2+ in a linear range from 10 pM to 50   nM (R 2 =0.9990), and a detection limit as low as 1.6 pM (S/N=3). Moreover, the proposed biosensor was successfully applied in the detection of Hg 2+ in environment water samples with satisfactory results.