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Quantum dots-based label-free fluorescence sensor for sensitive and non-enzymatic detection of caffeic acid

文献类型： 外文期刊

作者： Xiang, Xia 1 ; Shi, Jianbin 2 ; Huang, Fenghong 1 ; Zheng, Mingming 1 ; Deng, Qianchun 1 ;

作者机构： 1.Chinese Acad Agr Sci, Oil Crops Res Inst, Dept Prod Proc & Nutriol, Hubei Key Lab Lipid Chem & Nutr,Minist Agr Key La, Wuhan 430062, Peoples R China

2.Hubei Acad Agr Sci, Inst Agroprod Proc & Nucl Agr Technol, Wuhan 430064, Hubei Province, Peoples R China

关键词： Caffeic acid;Quantum dots;Fe2+;Turn-on;Fluorescence sensor

期刊名称：TALANTA （ 影响因子：6.057； 五年影响因子：5.386 ）

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收录情况： SCI

摘要： We have developed a label-free fluorescence sensor for caffeic acid (CA) by the use of CdTe:Zn2+ quantum dots (CdTe:Zn2+ QDs) as an output signal. The principle of sensor is based on the fluorescence quenching and binding properties of Fe2+ toward QDs and CA, respectively. To provide a fluorescence turn-on mode for CA detection, Fe2+ is first mixed with QDs solution, leading to a low fluorescence emission. With the addition of CA, the fluorescence of QDs is recovered due to the strong binding interaction between CA and Fe2+. Thus, a QDs-based label-free fluorescence sensor, designed in a simple mix-and-detect format, is established for CA detection. This study demonstrated here not only offers simple, sensitive and non-enzymatic detection method for CA, but also brings to light a new application of QDs in the food analysis. (C) 2015 Elsevier B.V. All rights reserved.

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