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Visual detection of Hg²? in aqueous solution using gold nanoparticles and thymine-rich hairpin DNA probes.


ABSTRACT: We report a sensitive method for visual detection of mercury ions (II) (Hg²?) in aqueous solution by using gold nanoparticles (Au-NPs) and thymine (T)-rich hairpin DNA probes. The thiolated hairpin DNA probe was immobilized on the Au-NP surface through a self-assembling method. Another thymine-rich, digoxin-labeled DNA probe was introduced to form DNA duplexes on the Au-NP surface with thymine-Hg²?-thymine (T-Hg²?-T) coordination in the presence of Hg²?. The Au-NPs associated with the formed duplexes were captured on the test zone of a lateral flow strip biocomponent (LFSB) by immunoreaction events between the digoxin on the duplexes and anti-digoxin antibodies on the LFSB. The accumulation of Au-NPs produced a characteristic red band on the test zone, enabling visual detection of Hg²? without instrumentation. A detection limit of 0.1 nM was obtained under optimal experimental conditions. This method provides a simple, rapid, sensitive approach for the detection of Hg²? and shows great promise for point-of-care and in-field detection of environmentally toxic mercury.

SUBMITTER: He Y 

PROVIDER: S-EPMC3220944 | biostudies-literature | 2011 Jul

REPOSITORIES: biostudies-literature

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Visual detection of Hg²⁺ in aqueous solution using gold nanoparticles and thymine-rich hairpin DNA probes.

He Yuqing Y   Zhang Xibao X   Zeng Kang K   Zhang Sanquan S   Baloda Meenu M   Gurung Anant S AS   Liu Guodong G  

Biosensors & bioelectronics 20110511 11


We report a sensitive method for visual detection of mercury ions (II) (Hg²⁺) in aqueous solution by using gold nanoparticles (Au-NPs) and thymine (T)-rich hairpin DNA probes. The thiolated hairpin DNA probe was immobilized on the Au-NP surface through a self-assembling method. Another thymine-rich, digoxin-labeled DNA probe was introduced to form DNA duplexes on the Au-NP surface with thymine-Hg²⁺-thymine (T-Hg²⁺-T) coordination in the presence of Hg²⁺. The Au-NPs associated with the formed dup  ...[more]

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