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Novel synthesis of orange-red emitting copper nanoclusters stabilized by methionine as a fluorescent probe for norfloxacin sensing.
Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy ( IF 4.3 ) Pub Date : 2020-04-01 , DOI: 10.1016/j.saa.2020.118334
Congying Shao 1 , Chunbo Li 1 , Cheng Zhang 1 , Zheng Ni 1 , Xianhu Liu 1 , Yongxiang Wang 1
Affiliation  

In the present work, we report a novel chemical approach for the synthesis of orange-red emitting copper nanoclusters (Cu NCs) using L-methionine as stabilizing agent at room temperature for the first time. The synthetic route is facile, economical and viable. The methionine stabilized copper nanoclusters (Cu NCs/Met) were thoroughly characterized by TEM, FT-IR, XPS, UV-Vis, steady state and transient fluorescence spectroscopy. The results show the synthesized Cu NCs/Met with a fluorescence quantum yield of 4.37% possessed high stability and excellent optical features such as large Stokes shift and long fluorescence lifetime (8.3 μs). Significantly, the fluorescence intensity of Cu NCs/Met could be efficiently quenched by norfloxacin (NOR) pharmaceutical. A fast and cost-effective NOR sensor was proposed employing Cu NCs/Met as the fluorescent nanoprobe, and the quenching mechanisms were attributed to inner filter effect and agglomeration-induced quenching. The developed sensor exhibited a high sensitivity and selectivity towards NOR in a wide linear range from 0.05 to 250 μM with a detection limit as low as 17 nM. Moreover, the practicability of the developed NOR sensor for real sample assay was validated with satisfactory recoveries, indicating this sensing platform with great potential for label-free pharmaceutical detection in complex systems.

中文翻译:

甲硫氨酸稳定的橙红色发射铜纳米簇的新型合成,作为诺氟沙星传感的荧光探针。

在目前的工作中,我们首次报道了一种在室温下使用L-蛋氨酸作为稳定剂合成橙红色发光铜纳米团簇(Cu NCs)的新颖化学方法。合成路线是容易,经济和可行的。通过TEM,FT-IR,XPS,UV-Vis,稳态和瞬态荧光光谱对蛋氨酸稳定的铜纳米簇(Cu NCs / Met)进行了全面表征。结果表明,合成的Cu NCs / Met具有4.37%的荧光量子产率,具有高稳定性和出色的光学特性,例如大的斯托克斯位移和长的荧光寿命(8.3μs)。值得注意的是,诺氟沙星(NOR)药物可有效淬灭Cu NCs / Met的荧光强度。提出了一种以Cu NCs / Met为荧光纳米探针的快速高效的NOR传感器,其猝灭机理归因于内部滤光效应和团聚诱导的猝灭。开发的传感器在0.05至250μM的宽线性范围内对NOR具有高灵敏度和选择性,检测极限低至17 nM。此外,开发的NOR传感器用于真实样品分析的实用性得到了令人满意的回收率的验证,表明该传感平台具有在复杂系统中进行无标记药物检测的巨大潜力。05至250μM,检测限低至17 nM。此外,开发的NOR传感器用于真实样品分析的实用性得到了令人满意的回收率的验证,表明该传感平台具有在复杂系统中进行无标记药物检测的巨大潜力。05至250μM,检测限低至17 nM。此外,开发的NOR传感器用于真实样品分析的实用性得到了令人满意的回收率的验证,表明该传感平台具有在复杂系统中进行无标记药物检测的巨大潜力。
更新日期:2020-04-03
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