Portable ratiometric probe based on the use of europium(III) coordination polymers doped with carbon dots for visual fluorometric determination of oxytetracycline,Microchimica Acta

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Portable ratiometric probe based on the use of europium(III) coordination polymers doped with carbon dots for visual fluorometric determination of oxytetracycline
Microchimica Acta ( IF 5.3 ) Pub Date : 2020-01-14 , DOI: 10.1007/s00604-019-4104-3
Lili Chen ₁ , Hui Xu ₁ , Li Wang ₁ , Yong Li ₂ , Xike Tian ₂

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A novel ratiometric fluorescent probe for the determination of oxytetracycline (OTC) was developed. The method is based on the use of adenosine monophosphate/Eu(III) nanoscale coordination polymers doped with carbon dots (CDs) (CD@AMP/Eu NCPs). These were fabricated by self-assembly of Eu 3+ and AMP on the surface of CDs containing large amounts of hydroxyl and carbonyl groups. Under the excitation at 310 nm wavelength, the doped NCPs display strong pink emission of Eu 3+ at 615 nm and blue emission of the CDs at 430 nm on exposure to OTC. The ratio of fluorescence intensity (F 615 /F 430 ) of such NCPs displays excellent linear relationship with OTC concentration ranging from 0.2 to 60 μM and the limit of detection (LOD) is 25 nM (3σ). The doped NCPs were evenly immobilized on common filter paper to prepare a visual ratiometric probe for the determination of OTC. Assisted by a digital camera with an APP color detector, the paper-based test strip was applied for the quantitative determination of OTC with a LOD of 0.5 μM and a wide linear scope of 1–100 μM. The method was applied to the determination of OTC in milk samples. Graphical abstract Schematic representation of the principle for oxytetracycline (OTC) determination using carbon dots (CD)@adenosine monophosphate (AMP)/Europium (Eu 3+ ) paper-based ratiometic probe.

中文翻译：

基于使用掺有碳点的铕 (III) 配位聚合物的便携式比例探针，用于土霉素的视觉荧光测定

开发了一种用于测定土霉素 (OTC) 的新型比率荧光探针。该方法基于使用掺杂有碳点 (CDs) (CD@AMP/Eu NCPs) 的单磷酸腺苷/Eu(III) 纳米级配位聚合物。这些是通过在含有大量羟基和羰基的 CD 表面上自组装 Eu 3+ 和 AMP 来制造的。在 310 nm 波长的激发下，掺杂的 NCP 在暴露于 OTC 时在 615 nm 处显示出强烈的 Eu 3+ 粉红色发射和在 430 nm 处的 CDs 蓝色发射。这种NCPs的荧光强度比（F 615 /F 430 ）与OTC浓度范围从0.2到60 μM显示出极好的线性关系，检测限（LOD）为25 nM（3σ）。将掺杂的 NCPs 均匀地固定在普通滤纸上, 以制备用于测定 OTC 的视觉比例探针。在带有APP颜色检测器的数码相机的辅助下，纸基试纸用于定量测定OTC，LOD为0.5 μM，线性范围为1-100 μM。该方法适用于牛奶样品中OTC的测定。图形摘要使用碳点 (CD)@腺苷单磷酸 (AMP)/铕 (Eu 3+ ) 纸基比例探针测定土霉素 (OTC) 原理的示意图。该方法适用于牛奶样品中OTC的测定。图形摘要使用碳点 (CD)@腺苷单磷酸 (AMP)/铕 (Eu 3+ ) 纸基比例探针测定土霉素 (OTC) 原理的示意图。该方法适用于牛奶样品中OTC的测定。图形摘要使用碳点 (CD)@腺苷单磷酸 (AMP)/铕 (Eu 3+ ) 纸基比例探针测定土霉素 (OTC) 原理的示意图。

更新日期：2020-01-14

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