Journal
ELECTROPHORESIS
Volume 33, Issue 14, Pages 2192-2196Publisher
WILEY-BLACKWELL
DOI: 10.1002/elps.201200043
Keywords
Cadmium telluride quantum dots; Indirect laser-induced fluorescence; Micellar electrokinetic capillary chromatography; Nicotinyl pesticide residues
Funding
- Specialized Research Fund for the Doctoral Program of Higher Education
- Ministry of Education, China [20093227110010]
- The Science Fund of Jiangsu University [08JDG001]
- Priority Academic Program Development of Jiangsu Higher Education Institutions
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A new assay was developed by use of micellar electrokinetic capillary chromatography with indirect LIF fluorescence for the determination of thiamethoxam, acetamiprid, and imidacloprid residues in vegetables, in which the cadmium telluride quantum dots (QDs) synthesized in aqueous phase were used as fluorescent background substance and their excitation and emission wavelengths matched with LIF detector by engineering their size. The factors that affected the peak height and the resolution were optimized. The running buffer was composed of 4.4 mu M cadmium telluride QDs as fluorescent background substance, 40 mM borate and 60 mM SDS, and its pH was adjusted to 8.0. The separation voltage was 25 kV. Under the optimum conditions, the detection limits were 0.05, 0.01, and 0.009 mg/kg; the linear dynamic ranges were 0.530, 0.130, and 0.130 mg/L; and the average recoveries of spiked samples were 72.0101.2, 74.0106.7, and 77.8105.1% for thiamethoxam, acetamiprid, and imidacloprid, respectively. The assay can meet the requirement of maximum residue limits to these three pesticides in the regulations of European Union and Japan, and has been applied for determining their residues in vegetables.
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