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Optimization of QuEChERS procedure by hydrophobic magnetic nanocomposites for residual OCPs determination coupled with GC-MS

AuthorsHubetska, T. S.; Kobylinska, N. G.; García, José R.
Magnetic nanocomposites
Issue Date2019
CitationXX EuroAnalysis (2019)
AbstractFood safety and environmental protection issues have attracted significant international attention in the recent years. The detection of organochlorine pesticides (OCPs) in food products is of key importance for the health of the consumers. Pesticides are found in food at very low concentrations, the separation and pre-concentration of the target analytes has become one of the most critical steps in the sample preparation technology. The QuEChERS is a type of sample preparation method for screening of pesticides in completely food matrixes. This procedure involves initial extraction with acetonitrile followed by a solid phase extraction with amine-loaded adsorbents in combination with hydrophobic C18 and graphitized carbon black for cleaning-up. In this work the application of magnetite nanoparticles modified with hydrophobic non-ionic surfactant Triton X-100 motives as an excellent clean-up agent is proposed. Hydrophobic groups grafted to the surface of magnetite nanoparticles can effectively remove non-polar components from the food matrix (fat, pigment, etc.) and then the particles can easily be separated from the extract by external magnetic field avoiding additional steps of centrifugation or filtration. The sample preparation method based on QuEChERS implying the use of new magnetic nanocomposite has been applied for the monitoring of various OCPs in food products. Under the found optimal conditions such parameters as sensitivity, precision, recoveries have been evaluated for the target analytes by GC-MS method. The results have shown a good linearity (R2≥ 0.9916), satisfactory average recoveries reaching the values between 89 and 110%, RSD of 2-15 %, except those for the hexane extraction of strawberry, radish and watermelon samples. The OCPs have been detected in strawberry (α- HCH; lindane) and radish (α, β-HCH isomers) samples. The magnetic nanocomposites have provided the lower level of co-extracted interferences (including pigments) in the samples and have displayed a better clean-up performance than C18 or carbon adsorbents. Thus, the developed method demonstrates the improved purification and simultaneous recovery of various OCPs.
DescriptionResumen del póster presentado a la XX Conference EuroAnalysis, celebrada en Estambul (Turquía) del 1 al 5 de septiembre de 2019.
Appears in Collections:(CINN) Comunicaciones congresos
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