Journal
FOOD CHEMISTRY
Volume 145, Issue -, Pages 41-48Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.foodchem.2013.08.028
Keywords
Sweeping; Micellar electrokinetic capillary chromatography; Triazine herbicide residues; Cereal; Vegetable
Funding
- Specialized Research Fund for the Doctoral Program of Higher Education, Ministry of Education, China [20093227110010]
- Science Fund of Jiangsu University [08JDG001]
- Priority Academic Program Development of Jiangsu Higher Education Institutions
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A new method was developed for the determination of eight triazine herbicide residues in cereal and vegetable samples by on-line sweeping technique in micellar electrokinetic capillary chromatography (MEKC). Some factors affecting analyte enrichment and separation efficiency were examined. The optimum buffer was composed of 25 mM borate, 15 mM phosphate, 40 mM sodium dodecylsulfate (SDS) and 3% (v/v) of 1-propanol at pH 6.5. The separation voltage was 20 kV and the sample was injected at 0.5 psi for 240 s. The detection wavelength was set at 220 nm with the capillary temperature being at 25 degrees C. Under the optimized conditions, the enrichment factors were achieved from 479 to 610. The limits of detection (LODs, S/N = 3) ranged from 0.02 to 0.04 ng/g and the limits of quantification (LOQs) of eight triazine herbicides were all 0.1 ng/g. The average recoveries of spiked samples were 82.8-96.8%. This method has been successfully applied to the determination of the triazine herbicide residues in cereal and vegetable samples. (C) 2013 Elsevier Ltd. All rights reserved.
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