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Silicon nanoparticles-based ratiometric fluorescence platform: Real-time visual sensing to ciprofloxacin and Cu2+
Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy ( IF 4.3 ) Pub Date : 2021-02-18 , DOI: 10.1016/j.saa.2021.119599
Xiaoying Yuan , Wendi Lv , Bing Wang , Chenglu Yan , Qiuting Ma , Baozhan Zheng , Juan Du , Dan Xiao

In this work, a silicon nanoparticles (Si NPs)-based ratiometric fluorescence sensing platform was conveniently fabricated by simply mixing fluorescent Si NPs as co-ligands and reference signal with lanthanide metal ion Eu3+ as response signal. The introduction of ciprofloxacin (CIP) remarkably turned on the characteristic fluorescence of Eu3+ at 590 nm and 619 nm through the “antenna effect”. At the same time, the blue emission of Si NPs at 445 nm kept comparatively stable. A good linear relationship between the ratio fluorescence intensity and CIP concentration in the range of 0.211–132.4 μM with a limit of detection (LOD) of 89 nM was obtained. In the presence of Cu2+, the fluorescence emission of Eu3+ was sharply turned off because of the stronger coordination ability of Cu2+ with CIP, which guaranteed the sequential detection of Cu2+. Meanwhile, the distinct fluorescent color change from bright blue to red, then back to blue, enabled naked-eye visual detection of CIP and Cu2+ in the solution phase and on paper-based test strip, and was successfully applied to determine the levels of CIP in complicated food samples with high sensitivity.



中文翻译:

基于硅纳米颗粒的比例荧光平台:实时监测环丙沙星和Cu 2+

在这项工作中,通过简单地将荧光Si NPs作为共配体和参考信号与镧系金属离子Eu 3+作为响应信号混合,可以方便地制造基于硅纳米颗粒(Si NPs)的比率式荧光传感平台。环丙沙星(CIP)的引入通过“天线效应”显着开启了Eu 3+在590 nm和619 nm处的特征荧光。同时,Si NP在445 nm处的蓝光发射保持相对稳定。获得的荧光强度与CIP浓度之比在0.211–132.4μM之间具有良好的线性关系,检出限(LOD)为89 nM。在Cu 2+的存在下,Eu 3+的荧光发射由于Cu 2+与CIP具有更强的配位能力,因此可以将Cu 2+急剧关闭,从而保证了对Cu 2+的顺序检测。同时,明显的荧光颜色从亮蓝色变为红色,然后变为蓝色,从而可以在溶液相和纸基试纸上用肉眼目测CIP和Cu 2+,并成功地用于确定含量复杂食品中CIP的检测具有很高的灵敏度。

更新日期:2021-03-01
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