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水相溶性 N-乙酰-L-半胱氨酸修饰的碲化镉量子点用于 Hg(II)检测。

Water-Soluble N-Acetyl-L-cysteine-Capped CdTe Quantum Dots Application for Hg(II) Detection.

机构信息

College of Pharmacy, South-Central University for Nationalities, Wuhan 430074, China.

出版信息

J Anal Methods Chem. 2013;2013:902951. doi: 10.1155/2013/902951. Epub 2013 Jul 9.

DOI:10.1155/2013/902951
PMID:23936732
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC3723248/
Abstract

A simple, rapid, and specific method for Hg(II) detection has been proposed based on the fluorescence change of N-acetyl-L-cysteine-capped CdTe quantum dots (QDs). The presence of Hg(II) ions could quench the fluorescence of QDs at 565 nm and meanwhile produce new peak in 700-860 nm wavelength range. The linear response range is 20-430 nM with the detection limit at 8.0 nM Hg(II). It was found that the position of the new peak was irrelevant to the size of QDs. Furthermore, the mechanism of the quenching of QDs fluorescence by Hg(II) and the appearance of new peak in near-infrared area were also discussed and deduced through ultraviolet absorption spectrum, fluorescence spectrum, and X-ray photoelectron spectrum.

摘要

基于巯基乙酸（N-乙酰-L-半胱氨酸）保护的CdTe 量子点（QDs）的荧光变化，提出了一种简单、快速、特异的汞离子（Hg(II)）检测方法。Hg(II)离子的存在可以猝灭 QDs 在 565nm 处的荧光，同时在 700-860nm 波长范围内产生新的峰。线性响应范围为 20-430nM，检测限为 8.0nM Hg(II)。结果发现，新峰的位置与 QDs 的尺寸无关。此外，还通过紫外吸收光谱、荧光光谱和 X 射线光电子能谱对 Hg(II)猝灭 QDs 荧光和近红外区新峰的出现机制进行了讨论和推断。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5618/3723248/b80022b06222/JAMC2013-902951.006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5618/3723248/56d9a65bcd5c/JAMC2013-902951.001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5618/3723248/46c4b57b6b76/JAMC2013-902951.002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5618/3723248/72c8621854bb/JAMC2013-902951.003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5618/3723248/d45cfc14e0a0/JAMC2013-902951.004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5618/3723248/09f208ee350b/JAMC2013-902951.005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5618/3723248/b80022b06222/JAMC2013-902951.006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5618/3723248/56d9a65bcd5c/JAMC2013-902951.001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5618/3723248/46c4b57b6b76/JAMC2013-902951.002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5618/3723248/72c8621854bb/JAMC2013-902951.003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5618/3723248/d45cfc14e0a0/JAMC2013-902951.004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5618/3723248/09f208ee350b/JAMC2013-902951.005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5618/3723248/b80022b06222/JAMC2013-902951.006.jpg

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