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Rapid determination of malachite green in water and fish using a fluorescent probe based on CdTe quantum dots coated with molecularly imprinted polymer.

Authors :
Wu, Le
Lin, Zheng-zhong
Zhong, Hui-ping
Chen, Xiao-mei
Huang, Zhi-yong
Source :
Sensors & Actuators B: Chemical. Feb2017, Vol. 239, p69-75. 7p.
Publication Year :
2017

Abstract

A fluorescent probe based on CdTe quantum dots (QDs) coated with molecularly imprinted polymers (MIPs) was fabricated for the determination of malachite green (MG) by the strategy of fluorescence resonance energy transfer (FRET). The MIP-coated QDs were synthesized through precipitation polymerization using acrylamide and ethylene glycol dimethacrylate as monomer and cross-linker, respectively. The optimum molar ratio of MG, monomer and cross-linker was 1:8:40 in 60 mL of acetonitrile, and the polymerization time was 28 h. The MIP-coated QDs, with an average diameter around 290 nm, showed excellent fluorescence emission in 500–700 nm at λ ex 370 nm. The probe exhibited fluorescence quenching response to MG selectively within only 5 min at the concentrations from 0.1 to 20 μmol L −1 . The fluorescent probe was successfully used to detect MG in water and fish samples with a detection limit of 0.059 μmol L −1 (3 σ , n = 9). The spiked recoveries, from 94.8% to 98.1% for water samples, and 98.1% to 106.2% for fish samples, respectively, indicated that the as-prepared MIP-coated QDs could be used as a fluorescent probe to detect MG rapidly in water and fish samples. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
09254005
Volume :
239
Database :
Academic Search Index
Journal :
Sensors & Actuators B: Chemical
Publication Type :
Academic Journal
Accession number :
119559963
Full Text :
https://doi.org/10.1016/j.snb.2016.07.166