An improved dispersive solid-phase extraction clean-up method for the gas chromatography-negative chemical ionisation tandem mass spectrometric determination of multiclass pesticide residues in edible oils.
An improved sample preparation using dispersive solid-phase extraction clean-up was proposed for the trace level determination of 35 multiclass pesticide residues (organochlorine, organophosphorus and synthetic pyrethroids) in edible oils. Quantification of the analytes was carried out by gas chromatography-mass spectrometry in negative chemical ionisation mode (GC-NCI-MS/MS). The limit of detection and limit of quantification of residues were in the range of 0.01-1ng/g and 0.05-2ng/g, respectively. The analytes showed recoveries between 62% and 110%, and the matrix effect was observed to be less than 25% for most of the pesticides. Crude edible oil samples showed endosulfan isomers, p,p'-DDD, α-cypermethrin, chlorpyrifos, and diazinon residues in the range of 0.56-2.14ng/g. However, no pesticide residues in the detection range of the method were observed in refined oils.
['Deme|Pragney|P|', 'Azmeera|Tirupathi|T|', 'Prabhavathi Devi|B L A|BL|', 'Jonnalagadda|Padmaja R|PR|', 'Prasad|R B N|RB|', 'Vijaya Sarathi|U V R|UV|']
D005506:Food Contamination D008401:Gas Chromatography-Mass Spectrometry D006843:Hydrocarbons, Chlorinated D009943:Organophosphorus Compounds D010573:Pesticide Residues D010938:Plant Oils D052616:Solid Phase Extraction D053719:Tandem Mass Spectrometry
Dispersive solid-phase extraction Pesticides Edible oils Negative chemical ionisation Gas chromatography Tandem mass spectrometry