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Application of a clean–up procedure using a ternary liquid phase system combined with pre‐concentration by microextraction in the analysis of seven pesticides from soya milk
Author(s) -
Abbaspour Maryam,
Farajzadeh Mir Ali,
Sorouraddin Saeed Mohammad,
Mohebbi Ali
Publication year - 2019
Publication title -
journal of the science of food and agriculture
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.782
H-Index - 142
eISSN - 1097-0010
pISSN - 0022-5142
DOI - 10.1002/jsfa.9639
Subject(s) - chromatography , extraction (chemistry) , chemistry , analyte , acetonitrile , detection limit , solvent , solid phase microextraction , flame ionization detector , pesticide , gas chromatography , gas chromatography–mass spectrometry , mass spectrometry , organic chemistry , agronomy , biology
BACKGROUND A method has been developed based on a three–phase system, followed by dispersive liquid–liquid microextraction for the extraction of seven pesticides from soya milk prior to analysis by gas chromatography‐flame ionization detection. The base of this method is the different extraction capability of the components of soya milk according to each of the phases involved. In this procedure, a homogeneous solution consisting of soya milk and a water–miscible solvent (acetonitrile) is separated into two phases in the presence of Na 2 SO 4 and the analytes are extracted into the produced acetonitrile droplets. The acetonitrile phase is mixed with a pre‐concentration solvent to perform the next microextraction procedure for further enrichment of the analytes. RESULTS Limits of detection and quantification were reached in the ranges of 0.11–0.35 and 0.35–1.20 µg L −1 , respectively. Enrichment factors and extraction recoveries were in the ranges of 562–933 and 56–93%, respectively. Relative standard deviations were ≤7% for intra– (n = 6) and inter–day (n = 5) precisions at two concentrations of 10 and 50 µg L −1 of each analyte. CONCLUSION The proposed method was applied to the analysis of pesticides in soya milk samples at µg L −1 concentrations. © 2019 Society of Chemical Industry