Low temperature-induced homogeneous liquid–liquid extraction and ternary deep eutectic solvent-based dispersive liquid–liquid microextraction followed by gas chromatography in the assessment of multiclass pesticide residues in cucumbers

2019 ◽  
Vol 43 (31) ◽  
pp. 12453-12461 ◽  
Author(s):  
Mir Ali Farajzadeh ◽  
Ali Mohebbi ◽  
Vahideh Tofigh Gharamaleki ◽  
Maryam Abbaspour ◽  
Saeed Mohammad Sorouraddin
Keyword(s):  
Gas Chromatography ◽  
Phase Separation ◽  
Low Temperature ◽  
Liquid Nitrogen ◽  
Pesticide Residues ◽  
Deep Eutectic Solvent ◽  
Liquid Extraction ◽  
Liquid Liquid Extraction ◽  
Dispersive Liquid Liquid Microextraction ◽  
Liquid Microextraction

In this work, a new DES and liquid nitrogen are used as a preconcentration solvent in DLLME and a phase separation agent in HLLE, respectively.

scholarly journals Determination of phenolic compounds in industrial wastewaters by gas chromatography after extraction and preconcentration by microextraction procedure

2020 ◽  
Keyword(s):  
Gas Chromatography ◽  
Phenolic Compounds ◽  
Enrichment Factors ◽  
Liquid Extraction ◽  
Fast Method ◽  
Effective Parameters ◽  
Homogeneous Liquid ◽  
Liquid Liquid Extraction ◽  
Dispersive Liquid Liquid Microextraction ◽  
Liquid Microextraction

<p>This paper presents an efficient, simple, and fast method for the derivatization, extraction, and preconcentration of several phenolic compounds (phenol, o–, m– and p–cresol, 4–chlorophenol, and 2–nitrophenol) from wastewater samples and analysis of those samples by gas chromatography–flame ionization detection. In this method, initially the phenolic compounds are derivatized with acetic anhydride in an alkaline pH. In the following, the derivatized analytes are extracted into mL–volume of acetonitrile during homogeneous liquid–liquid extraction and further enrichment of the analytes are accomplished by their extraction into µL–volume of 1,1,2–trichloroethane through dispersive liquid–liquid microextraction step. Effective parameters controlling the performance of the proposed method such as type and volume of derivatization agent and catalyst, type and volume of extraction/disperser solvent in homogeneous liquid–liquid extraction, and type and volume of extraction solvent and salt addition in dispersive liquid–liquid microextraction are optimized. Under optimum conditions linear range of the proposed method was obtained 0.7–4000 µg L–1. Limits of detection and quantification were in the ranges of 0.07–0.20 and 0.23–0.70 µg L–1, respectively. Enrichment factors and extraction recoveries were ranged from 220 to 440 and 44 to 88%, respectively.</p>

Development of homogeneous liquid–liquid extraction combined with dispersive liquid–liquid microextraction based on solidification of floating droplets of a ternary component deep eutectic solvent for the analysis of antibiotic residues in sausage samples prior to ion mobility spectrometry

2020 ◽  
Vol 12 (34) ◽  
pp. 4220-4228
Author(s):  
Ali Saei ◽  
Afshin Javadi ◽  
Mohammad Reza Afshar Mogaddam ◽  
Hamid Mirzaei ◽  
Mahboob Nemati
Keyword(s):  
Ion Mobility ◽  
Deep Eutectic Solvent ◽  
Liquid Extraction ◽  
Penicillin G ◽  
Antibiotic Residues ◽  
Homogeneous Liquid ◽  
Liquid Liquid Extraction ◽  
Dispersive Liquid Liquid Microextraction ◽  
Ternary Component ◽  
Liquid Microextraction

A combination of homogeneous liquid–liquid extraction and dispersive liquid–liquid microextraction based on solidification of a deep eutectic solvent is used for the extraction of 3 widely used antibiotics (oxytetracycline, penicillin G and tilmicosin) from sausage samples.

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