Shandong Peninsula Engineering Research Center of Comprehensive Brine Utilization, Weifang University of Science and Technology, Shouguang, 262700 Weifang, China.
Anal Methods. 2021 Jun 24;13(24):2659-2664. doi: 10.1039/d1ay00591j.
Herein, a novel and sensitive fluorescence method for cartap determination is established on the basis of the inner filter effect (IFE) of gold nanoparticles (Au NPs) on the fluorescence of glutathione protected Cu NCs (GSH-Cu NCs). In the presence of Au NPs, the fluorescence of GSH-Cu NCs was strongly quenched by the IFE because the absorption spectra of Au NPs overlap well with the emission spectra of GSH-Cu NCs. Upon addition of cartap, cartap could induce the aggregation of Au NPs whose absorption spectrum does not overlap with the emission spectrum of GSH-Cu NCs. Then, with the increase in cartap concentration, the IFE-decreased fluorescence was gradually recovered, realizing the fluorescence sensing of cartap. Under optimal conditions, the proposed method has a good linear relationship with cartap concentration in the range of 7-100 nM, and the detection limit is 3.34 nM. In addition, satisfactory results were obtained for cartap analysis using tap water and cabbage as real samples, which demonstrated that the method as-developed would have great practical application prospects.
本文基于金纳米粒子（Au NPs）对谷胱甘肽保护的铜纳米团簇（GSH-Cu NCs）荧光的内滤效应（IFE），建立了一种用于 cartap 测定的新颖且灵敏的荧光方法。在 Au NPs 的存在下，由于 Au NPs 的吸收光谱与 GSH-Cu NCs 的发射光谱很好地重叠，因此 GSH-Cu NCs 的荧光被 IFE 强烈猝灭。当加入 cartap 时，cartap 可以诱导 Au NPs 的聚集，其吸收光谱与 GSH-Cu NCs 的发射光谱不重叠。然后，随着 cartap 浓度的增加，IFE 降低的荧光逐渐恢复，实现了对 cartap 的荧光传感。在最佳条件下，该方法在 7-100 nM 的范围内与 cartap 浓度呈良好的线性关系，检测限为 3.34 nM。此外，使用自来水和白菜作为实际样品进行 cartap 分析得到了令人满意的结果，这表明所开发的方法具有很大的实际应用前景。
