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Thanks to the use of irm-NMR the results show a unique isotopic fingerprint for each TNT which enable origin discrimination between the samples without ambiguity. Nucleic acid-based biosensors have become powerful tools in biomedical applications. But the stability issue seriously limits their wide applications. Fortunately, the emergence of carbon nanoparticles (CNPs), which can effectively protect DNA probes from enzymatic digestion and unspecific protein binding, provides a good solution. In this work, a DNase I-aided cyclic enzymatic