Journal
ANALYTICAL METHODS
Volume 8, Issue 39, Pages 7054-7060Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6ay02169g
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Funding
- National Natural Science Foundation of China [51573075, 21404051, 21404052, 21104030]
- Natural Science Foundation of Shandong Province [ZR2014BQ016, BS2014CL040]
- Program for Scientific Research Innovation Team in Colleges and Universities of Shandong Province
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A label-free, exonuclease III (Exo III) assisted and cost-effective Hg2+ fluorometric assay based on a strand displacement amplification strategy was developed with high sensitivity and selectivity. Thymine-thymine (T-T) mismatches between the toehold domains in hairpin DNA and assistant DNA can serve as specific recognition elements for Hg2+ binding with the help of T-Hg2+-T base pairs to initiate a toehold-mediated strand displacement reaction. Exo III provides a reduced background signal, and the method is label-free using an intercalator, Sybr green I (SG). The number of T-T mismatches, the concentration of SG and Exo III, the incubation temperature and time were all optimized. Under the optimized condition, the limit of detection for Hg2+ can be as low as 9.42 pM with a linear range from 0.01 to 1 nM. Moreover, this proposed strategy shows excellent selectivity, and was successfully applied for the detection of Hg2+ in laboratory tap water and Yanjing lake water samples in our university.
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