Abstract
Ultrathin (<10 nm) nanosheets of a metal-organic framework (MOF-NSs) were prepared in high-yield and scalable production by a surfactant-assisted one-step method. The MOF-NSs possess distinguished affinity for ssDNA but not for dsDNA. This causes the fluorescence of the labeled DNA to be quenched. On binding to the target DNA (shown here for Salmonella enterica, Listeria monocytogenes and Vibrio parahemolyticus), the labeled duplex is released and the fluorescence of the label is restored. The labels Texas Red, Cy3 and FAM were used and give red, red or green fluorescence depending on the kind of pathogen. The detection limits are 28 pM, 35 pM and 15 pM for the gene segments of Salmonella enterica, Listeria monocytogenes and Vibrio parahemolyticus, respectively.
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Acknowledgements
The authors are grateful for financial support from National Key Research and Development Program of China (No. 2017YFC1601700) and National Natural Science Foundation of China (No. 31401568).
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Qiu, Q., Chen, H., Ying, S. et al. Simultaneous fluorometric determination of the DNAs of Salmonella enterica, Listeria monocytogenes and Vibrio parahemolyticus by using an ultrathin metal-organic framework (type Cu-TCPP). Microchim Acta 186, 93 (2019). https://doi.org/10.1007/s00604-019-3226-y
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DOI: https://doi.org/10.1007/s00604-019-3226-y