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Fluorescence Regulation of Copper Nanoclusters via DNA Template Manipulation toward Design of a High Signal-to-Noise Ratio Biosensor

Li, JY (Li, Junyao)[ 1 ] ; Fu, WX (Fu, Wenxin)[ 1 ] ; Bao, JC (Bao, Jianchun)[ 1 ] ; Wang, ZY (Wang, Zhaoyin)[ 1 ]*（王兆寅）; Dai, ZH (Dai, Zhihui)[ 1,2 ]*（戴志暉）

[ 1 ] Nanjing Normal Univ, Coll Chem & Mat Sci, Jiangsu Key Lab Biofunct Mat, Nanjing 210023, Jiangsu, Peoples R China

[ 2 ] Nanjing Normal Univ, Ctr Anal & Testing, Nanjing 210023, Jiangsu, Peoples R China

ACS APPLIED MATERIALS & INTERFACES,201802,10(8),6965-6971

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.

文章鏈接：

https://pubs.acs.org/doi/10.1021/acsami.7b19055