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A novel aptameric biosensor based on the self-assembled DNA-WS2 nanosheet architecture

文献类型： 外文期刊

作者： Li, Aixue 1 ; Zhang, Jian 2 ; Qiu, Jichuan 3 ; Zhao, Zhenhuan 3 ; Wang, Cheng 1 ; Zhao, Chunjiang 1 ; Liu, Hong 3 ;

作者机构： 1.Beijing Acad Agr & Forestry Sci, Beijing Res Ctr Informat Technol Agr, Beijing 100097, Peoples R China

2.Univ Lyon, ECL, INSA Lyon, UCBL,CPE,CNRS,INL,UMR 5270, 36 Ave Guy Collongue, F-69134 Ecully, France

3.Shandong Univ, State Key Lab Crystal Mat, Jinan 250100, Peoples R China

关键词： Aptamer Biosensor;Tungsten disulfide;ATP Hg+

期刊名称：TALANTA （ 影响因子：6.057； 五年影响因子：5.386 ）

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收录情况： SCI

摘要： It has been reported that tungsten disulfide (WS2) can bind single-stranded DNA (ssDNA) with high affinity while it has less affinity toward double stranded DNA (dsDNA). In this work, for the first time, the high affinity between WS2 and ssDNA was used to construct stable sensing interface for ATP detection. A DNA sequence with-SH at one end was first immobilized on Au electrode. WS2 nanosheets were immobilized on the SH-DNA/Au electrode surface due to the strong affinity between WS2 and ssDNA. Then the WS2 nanosheets were used to immobilize ATP binding aptamer (ABA) through the high affinity between WS2 and ssDNA, too. When ATP reacts with the ABA aptamer, duplex will be formed and dissociated from the WS2 nanosheets. On the basis of this, an electrochemical aptasensor for ATP was fabricated. This ATP sensor showed high sensitivity, selectivity and stability due to the unique WS2-ssDNA interactions and the specific aptamer-target recognition. Furthermore, this strategy was generalized to detect Hg2+ using a mercury-specific aptamer (MSO). This strategy can be expected to offer a promising approach for designing high-performance electrochemical aptasensors for a spectrum of targets.

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