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

作者：Torbati Mohammadali; Farajzadeh Mir Ali; Torbati Mostafa; Nabil Ali Akbar Alizadeh; Mohebbi Ali; Mogaddam Mohammad Reza Afshar^*

来源：Talanta, 2018, 176: 565-572.

DOI：10.1016/j.talanta.2017.08.074

• Pyrethroid pesticides
• Homogeneous liquid-liquid microextraction
• Solidification of floating organic drop, Gas
• chromatography
• Mass spectrometry

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 0.023-0.134 ng mL(-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 1 ng mL(-1) of each analyte. Finally, some fruit juice samples were effectively analyzed by the proposed method.

• 出版日期2018-1-1