Determination of multiresidue pesticides in green tea by using a modified QuEChERS extraction and ion-trap gas chromatography/mass spectrometry
| Autor: | Yolanda Fintschenko, Eric Phillips, David Steiniger, Jessie Butler, Guiping Lu |
|---|---|
| Rok vydání: | 2010 |
| Předmět: |
Pharmacology
Residue (complex analysis) Chromatography Pesticide residue Tea Chemistry Solid Phase Extraction Pesticide Residues Pesticide Quechers Gas Chromatography-Mass Spectrometry Analytical Chemistry Limit of Detection Tandem Mass Spectrometry Calibration Environmental Chemistry media_common.cataloged_instance Solid phase extraction Gas chromatography Gas chromatography–mass spectrometry European union Agronomy and Crop Science Food Science media_common |
| Zdroj: | Journal of AOAC International. 93(4) |
| ISSN: | 1060-3271 |
| Popis: | The pesticide residues in exported and imported tea products must not exceed the maximum residue limits (MRLs) regulated by the import countries. Tea is a complex matrix that obfuscates the determination of pesticide residues. Many available methods for multiresidue pesticide analysis of tea are time-consuming and require many cleanup steps. The objective of this study was to develop a simple multiresidue method by using a modified quick, easy, cheap, effective, rugged, and safe (QuEChERS) extraction and ion-trap GC/MS/MS, which can identify, confirm, and quantify pesticides in complex matrixes. A tea product was homogenized with water, and the pesticides were extracted with acetonitrile containing 1 acetic acid. The extract was subjected to centrifugation, initial cleanup with dispersive SPE (dSPE), solvent exchange, and final cleanup with dSPE. Diethyl-d10-parathion and triphenyl phosphate were used as the internal standard and surrogate, respectively. The final extract was injected into an ITQ 700 gas chromatograph/mass spectrometer. Quantitation of individual pesticides was based on matrix-matched calibration curves with a correlation coefficient of >0.9930 for the 22 pesticides selected for the study. The recoveries of the 22 pesticides ranged from 78 to 115, except those for diazinon (130) and malathion (122), with an average RSD of 8.7. The LOD values of all of the pesticides, except for terbufos, were below the MRLs set by the European Union and Japan. |
| Databáze: | OpenAIRE |
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