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Fluorescence Quenching Of Carbon Nitride Nanosheet Through Its Interaction With DNA For Versatile Fluorescence Sensing.

Quanbo Wang, W. Wang, Jianping Lei, N. Xu, Fenglei Gao, H. Ju
Published 2013 · Chemistry, Medicine

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This work investigates the interaction of carbon nitride nanosheet (CNNS), a recently developed two-dimensional nanomaterial, with DNA and its fluorescence quenching mechanism on fluorophore labeled single-stranded DNA probes. The static quenching through the photoinduced electron transfer (PET) from the excited fluorophore to the conductive band of CNNS is identified. Utilizing the affinity change of CNNS to DNA probes upon their recognition to targets and the PET-based fluorescence quenching effect, a universal sensing strategy is proposed for design of several homogeneous fluorescence detection methods with short assay time and high sensitivity. This strategy is versatile and can be combined with different amplification tools for quick fluorescence sensing of DNA and extensive DNA related analytes such as metal cations, small molecules, and proteins. As examples, two simple fluorescence detection methods for DNA and Hg(2+), one facile detection method coupled with Exo III-mediated target recycling for sensitive DNA analysis, and a ratiometric fluorescence protocol for DNA detection are proposed. This work provides an avenue for understanding the interaction between two-dimensional nanomaterials and biomolecules and designing novel sensing strategies for extending the applications of nanomaterials in bioanalysis.
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