Determination of residual pesticides in olive oil by GC–MS and HPLC–MS after extraction by size-exclusion chromatography

Abstract

This work describes the development of a method for analyzing pesticide residues in olive oil by GC-MS and HPLC-MS. Pesticides were separated from the oily matrix by size-exclusion chromatography. After extraction, 20 pesticides were separated and analyzed by GC-MS and 11 others HPLC-MS in electrospray mode. The development of this method enabled us to identify and quantify the pesticides of interest.

Evaluation of the QuEChERS sample preparation approach for the analysis of pesticide residues in olives

“…Mean % recoveries (and %RSDs) obtained with the QuEChERS method for spiked olive samples and analyzed using DSI-GC-MS (n = 6). Recoveries A120% or a70% are italicized (19) lyzed by DSI-GC-MS. The LOQs were lower than the 16Spk goals listed in Table 1.…”

“…Alternatively, SPE employing sorbents such as octadecylsilane (C 18 ), Florisil, alumina, and silica gel have been used [15 -17]. Gel permeation chromatography (GPC), in which molecules are separated according to size, is often applied for cleanup of fatty extracts [12,18,19]. This procedure offers a high degree of automation, but it is a rather slow and expensive sequential sample cleanup technique that uses large amounts of potentially hazardous organic solvents.…”

Determination of trace levels of aquaculture chemotherapeutants in seawater samples by SPME‐GC‐MS/MS

“…Nevertheless, synthetic Pyrs are more toxic (neurotoxic) and persistent than natural pyrethrins; some of the newest Pyrs persist in the environment for months [9,10]. OPPs and Pyrs have been found in varying concentrations in natural and drinking water [9 -14], vegetables [15 -18], sediments [19,20], fish [21,22] and vegetable oils [23,24]. The determination of pesticides in seawater is a difficult task because of the salinity matrix effect [25].…”

Pesticide Residue Analysis in Animal Origin Food: Procedure Proposal and Evaluation for Lipophilic Pesticides

“…[12][13], solid phase micro-extraction [14], matrix solid phase dispersion [15] and supercritical fluid extraction [16]; (ii) clean-up by normal phase liquid chromatography (NPLC) [17] and/or gel permeation chromatography (GPC) [18][19], solid phase extraction (SPE) [20][21], and dispersive solid phase extraction (d-SPE) [22]; (iii) concentration according to analytical technique. In recent years, QuEChERS (Quick, Easy, Cheap, Effective, Rugged and Safe) methodology (used for extraction and clean-up steps) has been applied with success on several non-fatty (< 2 %) food matrices such fruits and vegetables [23][24] and low-fatty (2-20 %) food matrices, such milk, egg and avocado [25].…”