研究目的
To achieve the highly sensitive detection of propanil in fish and seawater samples using molecularly imprinted quantum dots (MIP-QDs) as the specific recognition element and signal probe of a fluorescence sensor or test strip.
研究成果
MIP-QDs were successfully fabricated and used as the selective optosensing elements for the detection of propanil in fish and seawater samples. The developed fluorescence sensor and artificial test strip may serve as alternative tools for the sensitive screening and field testing of propanil in actual samples.
研究不足
The purification procedure was still important to obtain the excellent accuracy, precision and sensitivity during the propanil determination in fish samples by fluorescence sensor measurement. Further studies are needed to synthesize the MIP-QDs with the excellent antifouling properties to avoid the use of complex cleaning procedure during the fluorescence sensor measurements.
1：Experimental Design and Method Selection:
MIP-QDs were synthesized via reversed-phase microemulsion for propanil detection.
2：Sample Selection and Data Sources:
Fish samples were purchased from a local aquatic supermarket, and seawater samples were collected from Ningbo offshore.
3：List of Experimental Equipment and Materials:
CdSe/ZnS QDs, Triton X-100, TEOS, APTES, propanil, and other reagents were used.
4：Experimental Procedures and Operational Workflow:
The synthesis of MIP-QDs, optimization of parameters, selectivity evaluation, and application in fluorescence sensor and test strip for propanil detection.
5：Data Analysis Methods:
The fluorescence intensities were tested with an F-4600 spectrophotometer, and the Stern–Volmer equation was used to evaluate fluorescence response properties.
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F-4600 spectrophotometer
F-4600
Hitachi
Used to test the fluorescence intensities of the MIP-QDs.
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SEM
S-4800
Hitachi
Used to observe the morphological structure of polymers.
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TEM
H-7650
Hitachi
Used to observe the size distribution of polymers.
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CdSe/ZnS QDs
BEIDA JUBANG
Used as the signal probe in the fluorescence sensor and test strip for the detection of propanil.
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Triton X-100
Sigma-Aldrich
Used in the synthesis of MIP-QDs via reversed-phase microemulsion.
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TEOS
Sigma-Aldrich
Used in the synthesis of MIP-QDs.
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APTES
Sigma-Aldrich
Used as the functional monomer in the synthesis of MIP-QDs.
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UV-3300 spectrophotometer
UV-3300
MAPADA
Used to detect the UV absorption of QDs and propanil.
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XRD
D8 Advance Davinci
Used to analyze the structure of synthesized MIP-QDs and NIP-QDs.
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Zetasizer Nano
Malvern Instruments
Used to measure Zeta potential and DLS particles measurements.
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Fourier transform-infrared spectroscopy
Nicolet, Thermo USA
Used to identify chemical groups present on the surface of the MIP-QDs.
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UVP BioSpectrum imaging system
BioSpectrum 510
UVP
Used to analyze the fluorescence quenching of the fluorescence test strip.
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