Journal
BIOSENSORS & BIOELECTRONICS
Volume 25, Issue 6, Pages 1338-1343Publisher
ELSEVIER ADVANCED TECHNOLOGY
DOI: 10.1016/j.bios.2009.10.023
Keywords
Mercury; Molecular light switch; Ru(phen)(2)(dppz)(2+); Fluorimetry; DNA
Categories
Funding
- Foundation of Ministry of Education of China [200804260001]
- Natural Science Foundation of Shandong Province [JQ200805]
- National Nature Science Foundation of China [20775038]
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A novel signal-on assay for sensitive and selective detection of Hg2+ in aqueous solution based on mismatched DNA and a molecular light switch complex, [Ru(phen)(2)(dppz)](2+), was reported in the present work. This Hg2+ specific sensor system composed of two label-free DNA probes with eight T-T mismatches, which could form stable DNA duplexes by thymine-Hg2+-thymine (T-Hg2+-T) in the presence of Hg2+. The luminescence of [Ru(phen)(2)(dppz)](2+) is very weak in aqueous solution, and significant luminescence can be observed when intercalating into DNA duplexes. By monitoring Hg2+-dependent luminescence intensity enhancement, highly sensitive and selective determination of Hg2+ has been achieved. Under the optimum conditions, the luminescence intensity was proportional to the concentration of Hg2+ in the range of 1.0 x 10(-9)-1.5 x 10(-7) M. A detection limit of 3.5 x 10(-10) M Hg2+ was achieved using 3 sigma. The presence of other metal ions did not interfere with the detection of Hg2+ even at high concentrations. This approach is simple and rapid, which can be used to monitor the Hg2+ concentration in drinking water and natural media within 30 min. (C) 2009 Elsevier B.V. All rights reserved
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