Journal
CYTA-JOURNAL OF FOOD
Volume 17, Issue 1, Pages 976-987Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/19476337.2019.1680579
Keywords
QuEChERS; pesticide multi-residues; strawberries; dispersive solid-phase extraction; LC-MS/MS
Categories
Funding
- Korea Food Research Institute - Ministry of Science and ICT [E0187200-02]
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Herein, a QuEChERS (quick, easy, cheap, effective, rugged, and safe) procedure together with liquid chromatography and tandem mass spectrometry was applied to the multi-residue analysis of 203 pesticides in strawberries. To reduce the amount of co-eluents, we compared several dispersive solid-phase extraction cleanup procedures and found that cleanup using octadecylsilane provided the best recoveries. Spiked-sample recoveries of 70-120% with relative standard deviations of <20% were obtained for all tested pesticides except for quinmerac. Matrix-matched calibration curves exhibited good linearities (R-2 > 0.99), and the limits of quantification (LOQs) were lower than the maximum residue limits recommended by the European Commission and Korea Food and Drug Administration. The developed method was applied to real samples, revealing that their pesticide contents exceeded the corresponding LOQs. The obtained results demonstrate that octadecylsilane-based dispersive solid-phase extraction is a rapid and high-throughput cleanup procedure for the multi-residue analysis of pesticides in strawberries. RESUMENEl presente estudio aplico un procedimiento QuEChERS [acronimo en ingles de rapido, facil, barato, efectivo, resistente y seguro] junto con cromatografia liquida y espectrometria de masas en tandem para analizar residuos multiples de 203 pesticidas detectados en fresas. Con el proposito de reducir la cantidad de coeluyentes, se compararon varios procedimientos de limpieza de extraccion en fase solida dispersiva, constatandose que la limpieza con octadecilsilano proporciono las mejores recuperaciones. Asi, se obtuvieron recuperaciones de muestras con picos de 70-120% y desviaciones estandar relativas <20% para todos los pesticidas analizados, excepto quinmerac. Las curvas de calibracion de matriz coincidente exhibieron buenas linealidades (R-2 > 0.99), mientras que los limites de cuantificacion (LOQ) fueron inferiores a los limites maximos de residuos (LMR) recomendados por la Comision Europea y la Administracion de Alimentos y Medicamentos de Corea. El metodo desarrollado se aplico a muestras reales, revelando que los contenidos de pesticidas de estas excedian los LOQ correspondientes. Los resultados obtenidos demuestran que la extraccion dispersiva en fase solida basada en octadecilsilano es un procedimiento de limpieza rapido y de alto rendimiento para analizar residuos multiples de pesticidas en fresas.
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