NDLI: Nanoporous Au-based chronocoulometric aptasensor for amplified detection of Pb(2+) using DNAzyme modified with Au nanoparticles.

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Nanoporous Au-based chronocoulometric aptasensor for amplified detection of Pb(2+) using DNAzyme modified with Au nanoparticles.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Huang, Danlian Lai, Cui Zeng, Guangming Yang, Chunping Tang, Lin Zhang, Chen Zhou, Yaoyu Qin, Lei Cheng, Min
Description	Author Affiliation: Zhang C ( College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China); Lai C ( College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China); Zeng G ( College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China); Huang D ( College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China); Tang L ( College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China); Yang C ( College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China); Zhou Y ( College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China); Qin L ( College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China); Cheng M ( College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China)
Abstract	The authors herein described an amplified detection strategy employing nanoporous Au (NPG) and gold nanoparticles (AuNPs) to detect Pb(2+) ions in aqueous solution. The thiol modified Pb(2+)-specific DNAzyme was self-assembled onto the surface of the NPG modified electrode for hybridizing with the AuNPs labeled oligonucleotide and for forming the DNA double helix structure. Electrochemical signal, redox charge of hexaammineruthenium(III) chloride (RuHex), was measured by chronocoulometry. Taking advantage of amplification effects of the NPG electrode for increasing the reaction sites of capture probe and DNA-AuNPs complexes for bringing about the adsorption of large numbers of RuHex molecules, this electrochemical sensor could detect Pb(2+) quantitatively, in the range of 0.05-100nM, with a limit of detection as low as 0.012nM. Selectivity measurements revealed that the sensor was specific for Pb(2+) even with interference by high concentrations of other metal ions. This sensor was also used to detect Pb(2+) ions from samples of tap water, river water, and landfill leachate samples spiked with Pb(2+) ions, and the results showed good agreement with the found values determined by an atomic fluorescence spectrometer. This simple aptasensor represented a promising potential for on-site detecting Pb(2+) in drinking water.
ISSN	09565663
Journal	Biosensors and Bioelectronics
Volume Number	81
e-ISSN	18734235
Language	English
Publisher	Elsevier
Publisher Date	2016-07-15
Publisher Place	Great Britain (UK)
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Discipline Biotechnology
Content Type	Text
Resource Type	Article
Subject	Nanoscience and Nanotechnology Medicine Biophysics Biomedical Engineering Biotechnology Electrochemistry

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