Sensitive determination of herbicides in food samples by nonaqueous CE using pressurized liquid extraction

We have developed a method involving extraction with mixtures of solvents under pressure (pressurized liquid extraction (PLE)) for the determination of triazine herbicides in a series of samples from the food industry. The organic extracts obtained were subjected to a clean-up step with SPE, using O...

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Bibliographic Details
Published in:Electrophoresis 2007-10, Vol.28 (20), p.3606-3616
Main Authors: Carabias-Martínez, Rita, Rodríguez-Gonzalo, Encarnacion, Miranda-Cruz, Edith, Domínguez-Álvarez, Javier, Hernández-Méndez, Jesus
Format: Article
Language:English
Subjects:
Analytic Sample Preparation Methods - standards
Cereal
Chemical Fractionation - methods
Edible Grain - chemistry
Electrophoresis, Capillary - methods
Electrophoresis, Capillary - standards
Food Analysis - methods
Fruit
Hydrophobic and Hydrophilic Interactions
Nonaqueous CE
Pesticide Residues - analysis
Pressure
Pressurized liquid extraction
Sensitivity and Specificity
Soil Pollutants - analysis
Solanum tuberosum - chemistry
Solid Phase Extraction - methods
Solvents - chemistry
Spectrometry, Mass, Electrospray Ionization
Sulfonylurea Compounds - analysis
Tandem Mass Spectrometry
Triazine herbicides
Triazines - chemistry
Triazines - isolation & purification
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Summary:We have developed a method involving extraction with mixtures of solvents under pressure (pressurized liquid extraction (PLE)) for the determination of triazine herbicides in a series of samples from the food industry. The organic extracts obtained were subjected to a clean-up step with SPE, using Oasis MCX® sorbents, after which they were analyzed by NACE. Potato was chosen as a representative matrix of horticultural products since it has a high water content. Spiked potato samples were used to optimize extraction conditions. In order to compare the results obtained with NACE, different studies were also conducted using HPLC. The detection limits in NACE were similar to those found with HPLC and were of the order of 10-15 μg/kg, depending on the analyte. Satisfactory results were obtained on applying the method proposed for the potato matrix (PLE with separation by electrophoresis) to other food matrices such as other tubercles, fruits, vegetables and cereals.
ISSN:0173-0835
1522-2683
DOI:10.1002/elps.200700254