期刊
MICROCHEMICAL JOURNAL
卷 161, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.microc.2020.105798
关键词
Molecularly imprinted polymer; Carbon quantum dot; Fluorescence sensor; Sol-gel polymerization; MC-LR
资金
- National Natural Science Foundation of China [31501554]
- Guangdong Provincial Natural Science Foundation of China [2020A1515010517]
- Guangdong Provincial Science and Technology Planning Project of China [2017A020208059]
A novel fluorescence sensor, MIP@CODs@SiO2, was developed for selective and sensitive detection of MC-LR, showing high sensitivity, stability, and potential for practical applications.
Microcystin-LR (MC-LR) is a virulent hepatotoxin that is pervasive in rivers and lakes. The contamination of water with MC-LR poses a significant threat to human life and the water ecology. Therefore, it is of great interest developing a reliable, quick, and sensitive method for the detection of MC-LR. Herein, a novel type of molecularly imprinted polymer-coated carbon quantum dot (MIP@CODs@SiO2) fluorescence sensor is developed for the selective and sensitive determination of MC-LR. The MIP@CODs@SiO2 fluorescence sensor was fabricated via sol-gel polymerization using L-leucine as the segment template molecule, carbon quantum dots (CQDs) as the signal materials, 3-aminopropyltriethoxysilane as the monomer, and tetraethylorthosilicate as the crosslinker. The specific recognition sites in the polymer layers could selectively adsorb MC-LR molecules, which caused fluorescence-quenching behavior of CQDs via an electron transfer process. Under optimal conditions, the linear response associated with MC-LR was 1-1000 mu g/L with a limit of detection (LOD) of 0.0093 mu g/L. The imprinting factor was 5.0, and the adsorption ability was 3.23 mg/g. The proposed method was proved to efficiently detect MC-LR in real water samples. In addition, the fluorescence sensor proposed in this work shows good stability in a complex matrix, excellent selectivity and sensitivity to MC-LR in real sample analysis, and remarkable potential in practical applications.
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