Development and validation of multiresidue method for organophosphorus pesticides in lanolin using gas chromatography–tandem mass spectrometry

Abstract

Lanolin, also known as wool wax, is derived from sheep and has diverse applications in food, cosmetic, textile and lubricant industries. Owing to its direct contact with human, there is a need of studying pesticide residues as contaminants in lanolin. The present study describes a single novel hyphenated gas chromatography-tandem mass spectrometry (GC-MS/MS) technique for the quantification of 14 organophosphorus (OP) pesticides (tecnazene, propetamphos, diazinon, dichlofenthion, chlorpyrifos methyl, fenchlorphos, malathion, chlorpyrifos, pirimiphos ethyl, bromophos ethyl, tetrachlorvinphos, ethion, phosalone, and coumaphos) in lanolin using electrospray ionization (EI) with multiple reaction monitoring (MRM) acquisition mode. The method is simple in terms of sample preparation steps based on matrix solid-phase dispersion (MSPD). The method was found to be linear over the analytical range of 0.05-2.0 μg/g, with acceptable coefficient of determination (r 2 ≥ 0.99) for all the 14 pesticides. The limit of detection (LOD) and limit of quantification (LOQ) of the method were found to be less than 0.05 and 0.1 μg/g, respectively, for all the 14 OP pesticide residues. The precision and accuracy of the method were found to be within the acceptable limits, that is, recoveries in the range of 83.5%-104.1% with less than 12.5% of relative standard deviation for all the pesticides. The multiresidue method for estimating pesticide residues employing GC-MS/MS technique will be useful for OP pesticide levels in large number of lanolin samples.

A MnO2 nanosheet-mediated CRISPR/Cas12a system for the detection of organophosphorus pesticides in environmental water

“…Up to now, several high-precision techniques such as high-performance liquid chromatography (HPLC), 10 gas chromatography (GC), 11 mass spectrometry (MS), 12 and so on, have been exploited to accomplish detection, exhibiting excellent properties. However, the drawbacks of professional and tedious operation, sophisticated instrumentation, and time consumption have limited application under conditions of limited resources.…”

Serum butyrylcholinesterase activity in healthy dogs with and without exposure to diazinon

“…1 As laboratory options for diagnosis, there are direct and indirect methodologies. Direct methodologies seek to identify the toxic agent and/or its metabolites, such as thin layer chromatography (TLC), 5,6 gas chromatography (GC), 7 and high-performance liquid chromatography (HPLC). 5,8 However, these diagnostic methods are costly and, due to specific techniques for extracting the matrix, demand more time and sample preparation.…”