Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 10, Issue 8, Pages 6965-6971Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.7b19055
Keywords
copper nanoclusters; DNA template manipulation; fluorescence regulation; Hg2+ quantification; biosensor
Funding
- National Natural Science Foundation of China [21625502, 21475062, 21533012, 21505077]
- PAPD
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Because of bioaccumulation of food chain and disability of biodegradation, concentration of toxic mercury ions (Hg2+) in the environment dramatically varies from picomolar to micromolar, indicating the importance of well-performed Hg2+ analytical methods. Herein, reticular DNA is constructed by introducing thymine (T)-Hg2+-T nodes in poly(T) DNA, and copper nanoclusters (CuNCs) with aggregate morphology are prepared using this reticular DNA as a template. Intriguingly, the prepared CuNCs exhibit enhanced fluorescence. Meanwhile, the reticular DNA reveals evident resistance to enzyme digestion, further clarifying the fluorescence enhancement of CuNCs. Relying on the dual function of DNA manipulation, a high signal-to-noise ratio biosensor is designed. This analytical approach can quantify Hg2+ in a very wide range (50 pM to 500 mu M) with an ultralow detection limit (16 pM). Besides, depending on the specific interaction between Hg2+ and reduced L-glutathione (GSH), this biosensor is able to evaluate the inhibition of GSH toward Hg2+. In addition, pollution of Hg2+ in three lakes is tested using this method, and the obtained results are in accord with those from inductively coupled plasma mass spectrometry. In general, this work provides an alternative way to regulate the properties of DNA-templated nanomaterials and indicates the applicability of this way by fabricating an advanced biosensor.
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