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Talanta. 2018 Jan 1;176:565-572. doi: 10.1016/j.talanta.2017.08.074. Epub 2017 Aug 24.

Development of salt and pH-induced solidified floating organic droplets homogeneous liquid-liquid microextraction for extraction of ten pyrethroid insecticides in fresh fruits and fruit juices followed by gas chromatography-mass spectrometry.

Author information

1
Faculty of Traditional Medicine and Faculty of Nutrition, Tabriz University of Medical Sciences, Tabriz, Iran.
2
Department of Analytical Chemistry, Faculty of Chemistry, University of Tabriz, Tabriz, Iran; Engineering Faculty, Near East University, 99138 Nicosia, North Cyprus Mersin 10, Turkey.
3
Faculty of Dentistry,Tabriz University of Medical Sciences, Tabriz, Iran.
4
Food and Drug Laboratories, Tabriz University of Medical Sciences, Tabriz, Iran.
5
Department of Analytical Chemistry, Faculty of Chemistry, University of Tabriz, Tabriz, Iran.
6
Pharmaceutical Analysis Research Center, Tabriz University of Medical Sciences, Tabriz 51664, Iran. Electronic address: mr.afsharmogaddam@yahoo.com.

Abstract

A new microextraction method named salt and pH-induced homogeneous liquid-liquid microextraction has been developed in a home-made extraction device for the extraction and preconcentration of some pyrethroid insecticides from different fruit juice samples prior to gas chromatography-mass spectrometry. In the present work, an extraction device made from two parallel glass tubes with different lengths and diameters was used in the microextraction procedure. In this method, a homogeneous solution of a sample solution and an extraction solvent (pivalic acid) was broken by performing an acid-base reaction and the extraction solvent was produced in whole of the solution. The produced droplets of the extraction solvent went up through the solution and solidified using an ice-bath. They were collected without centrifugation step. Under the optimum conditions, limits of detection and quantification were obtained in the ranges of 0.006-0.038, and 0.023-0.134ngmL-1, respectively. The enrichment factors and extraction recoveries of the selected analytes ranged from 365-460 to 73-92%, respectively. The relative standard deviations were lower than 9% for intra- (n = 6) and inter-day (n = 4) precisions at a concentration of 1ngmL-1 of each analyte. Finally, some fruit juice samples were effectively analyzed by the proposed method.

KEYWORDS:

Homogeneous liquid–liquid microextraction; Mass spectrometry; Pyrethroid pesticides; Solidification of floating organic drop, Gas chromatography

PMID:
28917791
DOI:
10.1016/j.talanta.2017.08.074
[Indexed for MEDLINE]

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