Detection of malachite green in fish based on magnetic fluorescent probe of CdTe QDs/nano-Fe3O4@MIPs.
A magnetic fluorescent probe of CdTe QDs/nano-Fe3O4@MIPs was prepared using CdTe QDs and Fe3O4 nanoparticles as co-nucleus and molecularly imprinted polymers (MIPs) as specific recognition sites based on a reverse microemulsion method. With the specific enrichment and magnetic separation properties, the probe of CdTe QDs/nano-Fe3O4@MIPs was used to detect malachite green (MG) in fish samples. The TEM analysis showed that the particles of CdTe QDs/nano-Fe3O4@MIPs were spherical with average diameter around 53nm, and a core-shell structure was well-shaped with several Fe3O4 nanoparticles and CdTe QDs embedded in each of the microsphere. Quick separation of the probes from solutions could be realized with a magnet, indicating the excellent magnetic property of CdTe QDs/nano-Fe3O4@MIPs. The probe exhibited high specific adsorption towards MG and excellent fluorescence emission at λem 598nm. The fluorescence of CdTe QDs/nano-Fe3O4@MIPs could be linearly quenched by MG at the concentrations from 0.025 to 1.5μmolL-1. The detection limit was 0.014μmolL-1. The average recovery of spiked MG in fish samples was 105.2%. The result demonstrated that the as-prepared CdTe QDs/nano-Fe3O4@MIPs could be used as a probe to the detection of trace MG in fish samples.
['Wu|Le|L|', 'Lin|Zheng-Zhong|ZZ|', 'Zeng|Jun|J|', 'Zhong|Hui-Ping|HP|', 'Chen|Xiao-Mei|XM|', 'Huang|Zhi-Yong|ZY|']
D000818:Animals D019187:Cadmium Compounds D004350:Drug Residues D005399:Fishes D005456:Fluorescent Dyes D057230:Limit of Detection D016014:Linear Models D058185:Magnetite Nanoparticles D054802:Molecular Imprinting D045663:Quantum Dots D012394:Rosaniline Dyes D017747:Seafood D013050:Spectrometry, Fluorescence D013691:Tellurium
Malachite green Fish Magnetic fluorescent probe Molecularly imprinted polymers CdTe quantum dots