Multiresidue analytical method of pesticides in peanut oil using low-temperature cleanup and dispersive solid phase extraction by GC-MS

• Published in: Journal of separation science 2007-08, Vol.30 (13), p.2097-2104
• Main Authors: Li, Li, Zhang, Hongyan, Pan, Canping, Zhou, Zhiqiang, Jiang, Shuren, Liu, Fengmao
• Format: Article
• Language: English
• Subjects: Animals; Biological and medical sciences; Calibration; Cold Temperature; Dispersive solid phase extraction; Fat industries; Food Analysis - methods; Food industries; Fundamental and applied biological sciences. Psychology; Gas Chromatography-Mass Spectrometry - methods; Low temperature cleanup; Peanut Oil; Pesticide residue analysis; Pesticides - analysis; Plant Oils - chemistry; Reproducibility of Results; Sensitivity and Specificity; Solid Phase Extraction - methods; Solvents - chemistry
• ISSN: 1615-9306; 1615-9314
• DOI: 10.1002/jssc.200700052

A method for the determination of 33 pesticides in peanut oil by GC-MS was described. Two extraction procedures based on (i) low-temperature extraction and (ii) liquid-liquid extraction were tested for the optimization of the method. The mixture of anhydrous MgSO₄ with primary secondary amine (PSA) or with PSA and C₁₈ was performed as sorbents in dispersive SPE. Low temperature along with PSA and C₁₈ cleanup gave the best results. Pesticides were identified and quantified by GC-MS in SIM mode. The correlation coefficients, R², in the linear range tests were better than 0.990. The average recoveries for most pesticides (spiked at 0.02, 0.05, 0.2, and 1 mg/kg) ranged from 70 to 110%, the RSD was below 20% in most instances, and LODs varied from 0.5 to 8 μg/kg.