A simple and efficient multi-residue method based on quechers for pesticides determination in palm oil by liquid chromatography time-of-flight mass spectrometry

Sobhanzadeh, E. and Bakar, N.K.A. and Abas, M.R. and Nemati, K. (2012) A simple and efficient multi-residue method based on quechers for pesticides determination in palm oil by liquid chromatography time-of-flight mass spectrometry. Environmental Monitoring and Assessment, 184 (9). pp. 5821-5828. ISSN 01676369

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Abstract

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.

Item Type: Article
Uncontrolled Keywords: d-SPE LC-TOF-MS Multi-residue pesticides Palm oil Concentration levels Detection and quantification limit Dispersive solid phase extraction Graphitized carbon black Liquid-liquid extraction Low temperatures Magnesium sulphates Matrix effects Multi-class Octadecyl Pesticide residue Recovery rate Recovery yield Relative standard deviations Secondary amines Time of flight mass spectrometry Acetonitrile Carbon black Herbicides Liquid chromatography Magnesium Mass spectrometry Recovery Urea Vegetable oils atrazine carbaril carbon dimethoate diuron magnesium sulfate malathion pesticide simazine terbutylazine unclassified drug cleanup concentration (composition) extraction method vegetable oil article controlled study gas chromatography high performance liquid chromatography limit of detection limit of quantitation liquid liquid extraction low temperature separation technique signal noise ratio solid phase extraction Chromatography, Liquid Environmental Pollutants Food Analysis Food Contamination Pesticide Residues Plant Oils
Subjects: Q Science > QD Chemistry
Divisions: Faculty of Science > Dept of Chemistry
Depositing User: miss munirah saadom
Date Deposited: 02 Jul 2013 02:03
Last Modified: 23 Sep 2013 02:29
URI: http://eprints.um.edu.my/id/eprint/6264

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