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RSC Advances · 2018 ·Vol. 8 ·期 59 ·33947-33951 · IF 2.936

A highly sensitive and selective chemosensor for Pb2+ based on quinoline–coumarin

Xianjiao Meng,Duanlin Cao,Zhiyong Hu,Xinghua Han,Zhichun Li,Wenbing Ma

In this study, a highly sensitive and selective fluorescent chemosensor, ethyl(E)-2-((2-((2-(7-(diethylamino)-2-oxo-2H-chromene-3-carbonyl)hydrazono)methyl)quinolin-8-yl)oxy)acetate (1), was synthesized and characterized by 1H NMR, 13C NMR and ESI-MS. Sensor 1 showed an “on–off” fluorescence response to Pb2+ with a 1 : 1 binding stoichiometry in CH3CN/HEPES buffer medium (9 : 1 v/v). The detection limit of sensor 1 to Pb2+ was determined to be 0.5 μM, and the stable pH range for Pb2+ detection was from 4 to 8.

研究领域: 分析化学 · 环境科学

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International Journal of Electrochemical Science · 2023 · IF 1.5

Study on the Interaction of Formononetin and Herring Sperm DNA by Electrochemical Methods and Spectroscopy

Li Sun,Xueliang Wang,Na Zou,Hongying Li,Zhangyu Yu

The interaction of formononetin (FN) with herring sperm DNA has been studied by electrochemical methods, UV-Vis spectroscopy and fluorescence. On a poly L-cysteine film modified electrode (PLC/GCE), FN showed a couple of well-defined voltammetric peaks in 0.1 M acetate buffer of pH 5.3. As adding the herring sperm DNA into above solution, the peak current of FN decreased and no new peaks appeared. Based on the electrochemical results, the binding constant and binding ratio between FN and herring sperm DNA were determined to be 1.98×10 4 M -3 and 1:3, respectively. The UV-Vis spectroscopy indicated that the maximum absorption of FN had obviously hyperchromic effect and red shift after the interaction of DNA and FN. The interaction of DNA and FN can also make the fluorescence intensity of FN enhancement. The electrochemical and spectroscopic results indicated that the interaction of FN to DNA was an intercalative mode.

研究领域: 生物化学 · 药理学

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A highly sensitive and selective chemosensor for Pb2+ based on quinoline–coumarin

Study on the Interaction of Formononetin and Herring Sperm DNA by Electrochemical Methods and Spectroscopy