以枸杞为原料绿色制备碳量子点作为用于检测铁和 l-抗坏血酸的开关型纳米传感器。

Green preparation of carbon quantum dots with wolfberry as on-off-on nanosensors for the detection of Fe and l-ascorbic acid.

作者信息

Gu Lin, Zhang Jingru, Yang Guangxin, Tang Yunyu, Zhang Xuan, Huang Xuanyun, Zhai Wenlei, Fodjo Essy Kouadio, Kong Cong

机构信息

School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai 200090, PR China; East China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Shanghai 200090, PR China.

East China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Shanghai 200090, PR China.

出版信息

Food Chem. 2021 Dec 20;376:131898. doi: 10.1016/j.foodchem.2021.131898.

DOI:10.1016/j.foodchem.2021.131898

PMID:34968914

Abstract

A green and facile hydrothermal synthesis approach is proposed for the preparation of nitrogen-doped carbon quantum dots (N-CQDs) with wolfberry. These N-CQDs were developed as a highly sensitive fluorescent 'on-off-on' switch sensor for the sensing of Fe and l-ascorbic acid (AA). The N-CQDs displayed superior fluorescence characteristics of CQDs with a quantum yield up to 22%. The N-CQDs were demonstrated to selectively react with Fe, leading to fluorescence quenching effect, which was successfully used for the detection of Fe with a limit of detection at 3 μmoL•L. The addition of AA is supposed to repair the surface defects, and result in the fluorescence recovery. Based on this effect, the strategy of 'on-off-on' detection of AA was established with a limit of detection at 1.8 μmoL•L. Furthermore, the practical application of the detection of Fe lake water and AA in medical tablet was demonstrated, promising an effective and efficient 'on-off-on' nanosensor with low-cost, green synthesis for Fe and AA detection.

摘要

提出了一种绿色简便的水热合成方法，用于用枸杞制备氮掺杂碳量子点（N-CQDs）。这些N-CQDs被开发为一种用于检测铁和L-抗坏血酸（AA）的高灵敏度荧光“开-关-开”开关传感器。N-CQDs表现出优异的碳量子点荧光特性，量子产率高达22%。已证明N-CQDs与铁选择性反应，导致荧光猝灭效应，该效应成功用于检测铁，检测限为3 μmoL•L。添加AA被认为可以修复表面缺陷，并导致荧光恢复。基于此效应，建立了AA的“开-关-开”检测策略，检测限为1.8 μmoL•L。此外，还展示了该方法在检测湖水铁和医用片剂中AA的实际应用，有望成为一种低成本、绿色合成的高效“开-关-开”纳米传感器用于铁和AA的检测。