A simple and efficient multi-residue method based on quechers for pesticides determination in palm oil by liquid chromatography time-of-flight mass spectrometry
In this study, a rapid, specific and sensitive multi-residue method based on acetonitrile extraction followed by dispersive solid-phase extraction (d-SPE) clean-up was implemented and validated for multiclass pesticide residues determination in palm oil for the first time. Liquid-liquid extraction f...
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| Main Authors: | , , , |
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| Format: | Article |
| Published: |
2012
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| Subjects: | |
| Online Access: | http://eprints.um.edu.my/6264/ |
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| Summary: | In this study, a rapid, specific and sensitive multi-residue method based on acetonitrile extraction followed by dispersive solid-phase extraction (d-SPE) clean-up was implemented and validated for multiclass pesticide residues determination in palm oil for the first time. Liquid-liquid extraction followed by low-temperature precipitation procedure was evaluated in order to study the freezing-out clean-up efficiency to obtain high recovery yield and low coextract fat residue in the final extract. For clean-up step, d-SPE was carried out using a combination of anhydrous magnesium sulphate (MgSO4), primary secondary amine, octadecyl (C18) and graphitized carbon black. Recovery study was performed at two concentration levels (10 and 100 ng g -1), yielding recovery rates between 74.52 and 97.1 with relative standard deviation values below 10 (n=6) except diuron. Detection and quantification limits were lower than 5 and 9 ng g -1, respectively. In addition, soft matrix effects (�±20) were observed for most of the studied pesticides except malathion that indicated medium (20-50) matrix effects. The proposed method was successfully applied to the analysis of suspected palm oil samples. |
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