MPA-CdTe quantum dots as “on-off-on” sensitive fluorescence probe to detect ascorbic acid via redox reaction

被引：29
作者：
Ding M. [1 ,2 ,3 ]
Wang K. [1 ,2 ,3 ]
Fang M. [1 ,2 ,3 ]
Zhu W. [1 ,2 ,3 ]
Du L. [1 ,2 ,3 ]
Li C. [1 ,2 ,3 ]
机构：
[1] School of Chemistry and Chemical Engineering, Anhui University, Hefei
[2] AnHui Province Key Laboratory of Chemistry for Inorganic/Organic Hybrid Functionalized Materials, Anhui University, Hefei
[3] Anhui Province Key Laboratory of Environment-friendly Polymer Materials, Anhui University, Hefei
来源：
Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy | 2021年 / 234卷
基金：
中国国家自然科学基金;
关键词：
Ascorbic acid; CdTe quantum dots; Fluorescent probe; Redox reaction;
D O I：
10.1016/j.saa.2020.118249
中图分类号：
学科分类号：
摘要：
Mercaptopropionic acid (MPA) capped CdTe quantum dots (MPA-CdTe QDs) were synthesized in aqueous medium by hydrothermal method, which modified by Fe3+ could be used as a fluorescent probe to detect ascorbic acid (AA). MPA-CdTe QDs fluorescence probe could be used as successive sensor for metal ions and AA with “on-off-on” process. The fluorescence of QDs was quenched after adding Fe3+ to MPA-CdTe QDs. Then, the fluorescence of the Fe3+@MPA-CdTe QDs can be sensitively turned on by AA to give an “on–off–on” fluorescence response according to the oxidation–reduction between Fe3+ and AA. There was a linear relationship between fluorescence intensity quenching value and the concentration of Fe3+ in the range of 2–10 μM since Fe3+ sensitively reacted with CdTe QDs. The linear detection range for AA was 0.1–1 μM with a limit of detection of 6.6 nM. The principle is proved by fluorescence emission spectroscopy, nuclear magnetic resonance spectroscopy. The proposed method is successfully used to detect the AA in human plasma sample. © 2020
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