Journal
RSC ADVANCES
Volume 4, Issue 19, Pages 9439-9444Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c3ra45986a
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Funding
- Specialized Research Fund for the Doctoral Program of Higher Education of China [20121301120006]
- Scientific Research Projects of Higher Education of Hebei Province [Z2011131]
- Natural Scientific Research Projects of Hebei University [2010Q08]
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A new sensitive assay for Hg2+ ions has been demonstrated in this work based on isothermal exponential amplification reaction (EXPAR). In the presence of Hg2+ ions, a thymine (T)-rich oligonucleotide probe will firstly combine with a T-rich template through Hg2+-mediated T-Hg2+-T interaction and subsequently trigger the EXPAR reaction. EXPAR is a simple, fast and highly efficient amplification technique, which can provides 10(6)-10(9) fold amplification under isothermal conditions within minutes. Therefore, with real-time fluorescent detection of EXPAR products triggered by Hg2+ ions, high sensitivity is achieved and as low as 100 pM Hg2+ ions can be accurately determined in a 10 mu L reaction system. Furthermore, due to the specific binding between Hg2+ and thymine, even 10-100 fold excess of other metal ions do not interfere with the detection of Hg2+ ions, showing high specificity of this proposed assay.
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