Journal
BIOSENSORS & BIOELECTRONICS
Volume 67, Issue -, Pages 472-476Publisher
ELSEVIER ADVANCED TECHNOLOGY
DOI: 10.1016/j.bios.2014.08.088
Keywords
Gold nanoparticle; Chain; SERS; Mercury ions; Drinking water
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Funding
- MOST [2012AA06A303, 2012BAD29B04]
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Mercuric ions (Hg2+) mediate the transformation of single-stranded DNA to form double helical DNA by T-Hg2+-T interaction between base pairs. With this strategy, DNA modified gold nanoparticles (Au NPs) were assembled into chains which were displayed remarkable surface-enhanced Raman scattering (SERS) signal. Under optimized conditions, the length of gold nanochains was directly proportional to the mercuric ions concentrations over 0.001-0.5 ng mL(-1) and the limit of detection (LOD) in drinking water was as low as 0.45 pg mL(-1). With ultrasensitivity and excellent selectivity, this feasible and simple method is potentially as a promising tool for monitoring of mercury ions in food safety and environmental applications. (C) 2014 Elsevier B.V. All rights reserved.
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