Journal
JOURNAL OF SEPARATION SCIENCE
Volume 43, Issue 6, Pages 1119-1127Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/jssc.201901000
Keywords
acidic pesticides; deep eutectic solvents; derivatization; fruit juice; gas chromatography
Categories
Funding
- Research Council of the Tabriz University of Medical Science
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A stir bar sorptive extraction method coupled with deep eutectic solvent based solidification of floating organic droplets-dispersive liquid-liquid microextraction has been used for the simultaneous derivatization and extraction of some acidic pesticides in tomato samples. In this method, initially the analytes are adsorbed on a coated stir bar from tomato juice filled in a narrow tube. After extraction, the stir bar is removed and a water-miscible deep eutectic solvent is used to elute the analytes. Afterward, a derivatization agent and a water-immiscible deep eutectic solvent (as an extraction solvent) with melting point near to room temperature are added to the obtained eluant at mu L-levels and the obtained mixture is rapidly injected into deionized water. Under the optimum conditions, the introduced method indicated high enhancement (1543-3353) and enrichment (2530-2999) factors, low limits of detection (7-14 ng/L) and quantification (23-47 ng/L), good linearity (r(2) >= 0.9982), and satisfactory repeatabilities (relative standard deviation <= 12% for intra- and inter-day precisions at a concentration of 100 ng/L of each analyte). Finally, the proposed method was applied in analysis of the analytes in tomato samples.
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