Novel electrochemical sensing platform for quantitative monitoring of Hg(II) on DNA-assembled graphene oxide with target recycling

作者：Lu, Minghua^*; Xiao, Rui; Zhang, Xiaona; Niu, Jiahua; Zhang, Xiaoting; Wang, Youmei

来源：Biosensors and Bioelectronics, 2016, 85: 267-271.

DOI：10.1016/j.bios.2016.05.027

• Electrochemical sensor
• Mercury ion
• Graphene oxide
• Poly-T oligonucleotide
• DNase I
• Target recycling

This work designs a new electrochemical sensing platform for the quantitative monitoring of mercury ion (Hg2+) on poly-T-(15) oligonucleotide-functionalized graphene oxide by coupling with DNase I-assisted target recycling amplification. The assay was carried out on the basis of T-Hg2+-T coordination chemistry by using target-induced dissociation of indicator-labeled poly T(15) oligonucleotide from graphene oxide nanosheets. The electronic signal was amplified through DNase I-triggered target recycling. Experimental results indicated that the amperometric response of DNA-based sensing platform deceased with the increasing Hg2+ concentration in the sample, and has a detection limit of 0.12 nM with a dynamic working range of up to 50 nM. Our strategy afforded exquisite selectivity for Hg2+ against other environmentally related metal ions. More significantly, this methodology displayed high reproducibility and acceptable accuracy, thus representing an optional sensing scheme for the screening of Hg2+ in environmental water samples.

• 出版日期2016-11-15
• 单位河南大学