Analysis of pesticide residues in fruit juices by matrix-solid phase dispersion and gas chromatographic determination

Abstract

KeyWordsGas ch ro matog rap hy MSPD Pesticides FruTt iuTces SummaryA rapid muhTresTdue method has been developed far the analysis of pesticdes in fruTt Tuices. The compounds studTed were two insecticides (endosulfan I, endesulfan II and their metabolTte endesulfan sulfate), five fungTddes (chlorothalonTI, vinclazalin, procymTdane, hexacanazole and fenarTmol) and two acaricides (dicafol and tetradifon). The method Ts based on the dispersion of fruit iuioes on the adsorbent, Florisil, placed in small glass columns, and subsequent ex traction of pesticides using a small volume of ethyl acetate. Residue levels were determined by gas chromatography with electron capture detection. The ECD response for all pestiddes was linear in the range of conoentrafions studied, with correlation coefficients higher than 0.99. Re coveries obtained for pesticides in different fruit iuices at various fortification levels were higher than 74%, with relatTve standard devTatTans between ] and ]2%. The detection ITmits ranged from ]ta 5 u.g kg i. The identTtyofthe pesticides was confirmed byGC-MS.

Determination of herbicide residues in juice by matrix solid-phase dispersion and gas chromatography–mass spectrometry

“…The sample preparation is based on a previously published method for the determination of insecticide and fungicide residues in fruit juices [14,15]. Glass columns, with Whatman No.1 filters placed at the bottom end, were filled with 2 g of Florisil.…”

“…The dispersion of solid samples is previously done in a mortar and then the mixture is transferred to the extraction columns [13]. In the case of liquid samples, the dispersion of the matrix in the adsorbent can be done directly in the extraction columns [14,15].…”

Development of a matrix solid-phase dispersion-sonication extraction method for the determination of fungicides residues in ginseng extract

“…The dispersion of solid samples is previously done in a mortar, and then the mixture is transferred to the extraction columns (Kadenczki et al, 1992;Kristenson, Ramos, & Brinkman, 2006). In the case of liquid samples, the dispersion of the matrix in the adsorbent can be done directly in the extraction columns (Tadeo & Sánchez, 2003;Albero, Sánchez, & Tadeo, 2003b). MSPD has many advantages over the traditional techniques, such as the use of smaller amounts of organic solvent, lower solvent cost and reduced toxic organic solvent.…”

Determination of Phenylureas Herbicides in Foodstuffs Based on Matrix Solid-Phase Dispersion Extraction and RP-LC with UV Detection

“…In order to determine trace analytes by UV detection method, a sample preparation technique prior to analysis is needed, the most used sample preparation techniques include SPE [3,5,8,[12][13][14], SPME [6,11], LLE [10], LPME [15,16], and DLLME [17]. However, these techniques possess some defects.…”

“…Phenylurea herbicides (PUHs) are widely used in crops but they will remain in the environment for a long time due to their stable chemical property and reach to toxic levels by bio-accumulation [1]. Determination of PUHs in water and plants by various analytical techniques, such as gas chromatography (GC) [2][3][4], has been reported. However, derivatization is still necessary for thermally unstable PUHs to be determined by GC.…”