Abstract
We describe a reversible fluorescent DNA–based INHIBIT logic gate for the determination of silver(I) and iodide ions using graphene oxide (GO) as a signal transducer and Ag(I) and iodide as mechanical activators. The basic performance, optimized conditions, sensitivity and selectivity of the logic gate were investigated and revealed that the method is highly sensitive and selective over potentially interfering ions. The limits of detection for Ag(I) and iodide are 10 nM and 50 nM, respectively. This logic gate was successfully applied to the determination of Ag(I) and iodide in (spiked) tap water and river water. It was also used for the determination of iodide in human urine samples with satisfactory results. Compared to other methods, this INHIBIT logic gate is simple in design and has small background interference.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (21173071) and the key projects of science and technology of Henan Educational Committee (Grant No. 14B150049).
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Lv, H., Li, S., Liu, Y. et al. A reversible fluorescent INHIBIT logic gate for determination of silver and iodide based on the use of graphene oxide and a silver–selective probe DNA. Microchim Acta 182, 2513–2520 (2015). https://doi.org/10.1007/s00604-015-1620-7
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DOI: https://doi.org/10.1007/s00604-015-1620-7