Foods of plant origin - Multimethod for the determination of pesticide residues in vegetable oils by LC-MS/MS (QuOil)

Abstract o-Tolidine plus KI, p-nitrobenzene-diazoniumfluoroborate, bioassay with fungi and enzyme sources, AgNO3 plus UV radiation, and p-dimethyl-aminobenzaldehyde modes of detection have been selected for TLC screening of pesticide residues in extracts of samples of unknown origin. Single solvents were used for the elution. Coefficients of variation of Rf values were studied as a function of Rf and eluants. Indicator compounds were used for controlling the proper conditions of detection. The detectability of 188 pesticide compounds was tested, and the minimum detectable amounts were determined.

Download Full-text

Foods of plant origin. Determination of pesticide residues using LC-MS/MS following methanol extraction and clean-up using diatomaceous earth

10.3403/30160810 ◽

2008 ◽

Keyword(s):

Pesticide Residues ◽

Diatomaceous Earth ◽

Plant Origin ◽

Methanol Extraction ◽

Origin Determination

Download Full-text

Foods of plant origin. Multimethod for the determination of pesticide residues using GC- or LC-based analysis following acetonitrile extraction/partitioning and cleanup by dispersive SPE. Validation data of the modular QuEChERS-method

10.3403/30341730 ◽

2017 ◽

Keyword(s):

Pesticide Residues ◽

Plant Origin ◽

Quechers Method ◽

Validation Data ◽

Dispersive Spe

Download Full-text

Multicolumn Solid-Phase Extraction Cleanup of Organophosphorus and Organochlorine Pesticide Residues in Vegetable Oils and Butterfat

Journal of AOAC International ◽

10.1093/jaoac/78.2.431 ◽

1995 ◽

Vol 78 (2) ◽

pp. 431-436 ◽

Cited By ~ 17

Author(s):

Allesia M Gillespie ◽

Sean L Daly ◽

Dalia M Gilvydis ◽

Felix Schneider ◽

Stephen M Walters

Keyword(s):

Solid Phase Extraction ◽

Vegetable Oils ◽

Pesticide Residues ◽

Diatomaceous Earth ◽

Solid Phase ◽

Electron Capture Detection ◽

Phase Extraction ◽

Lipid Matrix ◽

Photometric Detection

Abstract Diatomaceous earth columns used with reversed and normal solid phase extraction (SPE) cartridges were evaluated for the quantitative determination of a number of organophosphorus (OP) and organochlorine (OC) pesticide residues in edible vegetable oils and butterfat. An oil or fat sample (about 2 g) in hexane was passed through a diatomaceous earth (Extrelut QE) column and a Cis bonded silica (ODS) SPE cartridge, resulting in the separation of the pesticides from about 98% of the lipids. The eluate was split in half, with the first portion concentrated into acetone for the determination of OP pesticides by gas chromatography with flame photometric detection (GC–FPD). The other half was passed through an Alumina-N SPE cartridge for additional cleanup of lipid matrix to determine OC pesticides by GC with electron-capture detection (GC–ECD). Average recoveries from fortified samples were greater than 89% for the pesticides studied.

Download Full-text