基于 D-青霉胺/半胱胺-硫化镉量子点的高选择性圆二色传感器用于铜（II）离子检测。
Highly selective circular dichroism sensor based on d-penicillamine/cysteamine‑cadmium sulfide quantum dots for copper (II) ion detection.
机构信息
Materials Chemistry Research Center, Department of Chemistry and Center of Excellence for Innovation in Chemistry, Faculty of Science, Khon Kaen University, Khon Kaen 40002, Thailand.
Synchrotron Light Research Institute, Nakhon Ratchasima 30000, Thailand.
出版信息
Spectrochim Acta A Mol Biomol Spectrosc. 2019 Mar 15;211:313-321. doi: 10.1016/j.saa.2018.12.027. Epub 2018 Dec 14.
A highly selective circular dichroism sensor based on cysteamine-capped cadmium sulfide quantum dots (Cys-CdS QDs) was successfully developed for the determination of Cu. Basically, the Cys-CdS QDs are not active in circular dichroism spectroscopy. However, the circular dichroism probe (DPA@Cys-CdS QDs) can be simply generated in situ by mixing achiral Cys-CdS QDs with D-penicillamine. The detection principle was based on measuring the circular dichroism signal change upon the addition of Cu. The strong CD signal of the DPA@Cys-CdS QDs dramatically decreased in the presence of Cu, while other cations did not result in any spectral changes. In addition, the degree of the CD signal decrease was linearly proportional to the concentration of Cu in the range of 0.50-2.25 μM (r = 0.9919) with a detection limit of 0.34 μM. Furthermore, the proposed sensor was applied to detect Cu in drinking water samples with %recovery values of 102-114% and %RSD less than 6%.
基于半胱胺修饰的硫化镉量子点（Cys-CdS QDs）的高选择性圆二色传感器成功开发用于测定 Cu。基本上，Cys-CdS QDs 在圆二色光谱中没有活性。然而，通过将非手性 Cys-CdS QDs 与 D-青霉胺混合，可以简单地原位生成圆二色探针（DPA@Cys-CdS QDs）。检测原理基于测量添加 Cu 后圆二色信号的变化。在 Cu 的存在下，DPA@Cys-CdS QDs 的强圆二色信号显著降低，而其他阳离子则不会导致任何光谱变化。此外，CD 信号的降低程度与 0.50-2.25 μM 范围内 Cu 的浓度呈线性比例关系（r=0.9919），检测限为 0.34 μM。此外，该传感器用于测定饮用水样品中的 Cu，回收率值在 102%-114%之间，%RSD 小于 6%。
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