A novel electrochemical biosensor for ultrasensitive Hg2+ detection via a triple signal amplification strategy

We developed a novel electrochemical biosensor for ultrasensitive Hg2+ detection via a triple signal amplification strategy of a DNA dual cycle, organic-inorganic hybrid nanoflowers (Cu-3(PO4)(2) HNFs) and gold nanoparticle (AuNP) probe. The DNA dual cycle was triggered by exonuclease III (Exo III) in the presence of Hg2+, and Cu-3(PO4)(2) HNFs were synthesized as an AuNP probe carrier. The electrochemical biosensor displayed high stability, high sensitivity and excellent specificity, which was improved by up to seven orders of magnitude compared to the World Health Organization (WHO) allowed Hg2+ levels in drinking water. This signal amplification strategy could be easily modified and extended to detect other hazardous heavy metals and nucleic acids.

Automated summary

A novel electrochemical biosensor was developed for ultrasensitive Hg2+ detection using a triple signal amplification strategy involving DNA dual cycle, organic-inorganic hybrid nanoflowers, and gold nanoparticle probe. The biosensor exhibited high stability, sensitivity, and specificity, with detection levels improved by up to seven orders of magnitude compared to WHO standards. This versatile strategy could be easily adapted for detecting other hazardous heavy metals and nucleic acids.