Abstract
An ultrasensitive method for colorimetric and fluorometric determination of Hg(II) is described. It involves a dual signal detection strategy based on the use of gold nanoparticles (AuNPs) and of a catalytic hairpin self-assembly. Three fluorophore-labeled metastable hairpin DNA probes were adsorbed on AuNPs to quench the fluorescence of the labels. The addition of Hg(II) causes catalytic self-assembly of the hairpins due to formation of T-Hg(II)-T base pairs with the aid of helper DNA to form a branched junction. The branched junction is a dsDNA that is released from the surface of the AuNPs. As a result, fluorescence recovers. Its intensity, best measured at excitation/emission wavelengths of 492/517 nm, increases linearly in the 0.2 to 100 nM of Hg(II) concentration range. The limit of detection is 0.1 nM. This is comparable to, or better than in other amplification based methods. The detection scheme offers both colorimetric (visual) and fluorescent read-out.
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Acknowledgments
This work is sponsored by the National Natural Science Foundation of China (Grant No. 31300819), Open Research Fund (CQCM-2016-05), the Opening Project of Zhejiang Provincial Top Key Discipline of Pharmaceutical Sciences (Grant No.201712), the Science and Technology Research Program of Chongqing Municipal Education Commission (Grant No. KJ1706156), the Project of Wenzhou Science &Technology Bureau (S20150012) and Open Research Fund Program of Key Laboratory of Reservoir Aquatic Environment of CAS.
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Yang, L., Yun, W., Chen, Y. et al. Ultrasensitive colorimetric and fluorometric detection of Hg(II) based on the use of gold nanoparticles and a catalytic hairpin assembly. Microchim Acta 184, 4741–4747 (2017). https://doi.org/10.1007/s00604-017-2516-5
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DOI: https://doi.org/10.1007/s00604-017-2516-5