title: Ultrasensitive and selective electrochemical biosensor for detection of mercury (II) ions by nicking endonuclease-assisted target recycling and hybridization chain reaction signal amplification.
abstract: In this paper, a novel and signal-on electrochemical biosensor based on Hg2+- triggered nicking endonuclease-assisted target recycling and hybridization chain reaction (HCR) amplification tactics was developed for sensitive and selective detection of Hg2+. The hairpin-shaped capture probe A (PA) contained a specific sequence which was recognized by nicking endonuclease (NEase). In the presence of Hg2+, probe B (PB) hybridized with PA to form stand-up duplex DNA strands via the Hg2+mediated thymine-Hg2+-thymine (T-Hg2+-T) structure, which automatically triggered NEase to selectively digest duplex region from the recognition sites, spontaneously dissociating PB and Hg2+and leaving the remnant initiators. The released PB and Hg2+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 Hg2+in a linear range from 10 pM to 50nM (R2=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 Hg2+in environment water samples with satisfactory results.
authors.affiliation: Ministry of Education Key Laboratory of Analysis and Detection for Food Safety, Fujian Provincial Key Laboratory of Analysis and Detection for Food Safety, College of Chemistry, Fuzhou University, Fuzhou, Fujian 350116, China.
authors.forename: Minqiang
authors.initials: M
authors.lastname: Hong
authors.affiliation: Ministry of Education Key Laboratory of Analysis and Detection for Food Safety, Fujian Provincial Key Laboratory of Analysis and Detection for Food Safety, College of Chemistry, Fuzhou University, Fuzhou, Fujian 350116, China.
authors.forename: Mengyan
authors.initials: M
authors.lastname: Wang
authors.affiliation: Ministry of Education Key Laboratory of Analysis and Detection for Food Safety, Fujian Provincial Key Laboratory of Analysis and Detection for Food Safety, College of Chemistry, Fuzhou University, Fuzhou, Fujian 350116, China.
authors.forename: Jing
authors.initials: J
authors.lastname: Wang
authors.affiliation: Ministry of Education Key Laboratory of Analysis and Detection for Food Safety, Fujian Provincial Key Laboratory of Analysis and Detection for Food Safety, College of Chemistry, Fuzhou University, Fuzhou, Fujian 350116, China. Electronic address: xxq@fzu.edu.cn.
authors.forename: Xueqin
authors.initials: X
authors.lastname: Xu
authors.affiliation: Ministry of Education Key Laboratory of Analysis and Detection for Food Safety, Fujian Provincial Key Laboratory of Analysis and Detection for Food Safety, College of Chemistry, Fuzhou University, Fuzhou, Fujian 350116, China.
authors.forename: Zhenyu
authors.initials: Z
authors.lastname: Lin
mesh_terms: D015374:Biosensing Techniques / Q000379:methods*; D004720:Endonucleases / Q000737:chemistry; D007477:Ions / Q000737:chemistry / Q000302:isolation & purification*; D057230:Limit of Detection; D008628:Mercury / Q000737:chemistry / Q000302:isolation & purification*; D021141:Nucleic Acid Amplification Techniques
chemical_list: D007477:Ions; D004720:Endonucleases; D008628:Mercury
keywords: Electrochemical biosensor; Hg(2+) detection; Hybridization chain reaction; Nicking endonuclease