Journal
ANALYTICA CHIMICA ACTA
Volume 713, Issue -, Pages 45-49Publisher
ELSEVIER
DOI: 10.1016/j.aca.2011.11.003
Keywords
Eectrochemiluminescence; Rolling circular amplification; Biomimetic structure; Hg2+ detection
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Funding
- National Basic Research Program of China [2010CB732602]
- NSFC-Guangdong [U0931005]
- Program for Changjiang Scholars and Innovative Research Team in University [IRT0829]
- National Natural Science Foundation of China [81101121]
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In this study, we firstly demonstrated that Bst DNA polymerase shows specific recognition and function on the T-Hg2+-T biomimetic structure. Based on this, a novel available electrochemiluminescence (ECL) sensor for Hg2+ has been developed. In this strategy, magnet beads tagged primer was designed to complementary to the region of the circular padlock probe but with two T-T mismatches at the 3' end. The mismatched primers cannot be extended by Bst DNA polymerase in the absence of Hg2+. Stable T-Hg2+-T can be formed in the presence of Hg2+, thus induces the elongation and amplification reaction by DNA polymerase with a rolling circular amplification (RCA) mechanism. Subsequently, the resulted RCA products are hybridized with the tris (bipyridine) ruthenium (TBR)-tagged probes and detected by ECL platform. Current method shows a sub-nanomolar sensitivity and excellent selectivity over a spectrum of interference metal ions. (C) 2011 Elsevier B.V. All rights reserved.
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