Nano‐structured gemini‐based supramolecular solvent for the microextraction of cyhalothrin and fenvalerate

In this work, a simple method, namely, tandem dispersive liquid-liquid microextraction, with a high sample clean-up is applied for the rapid determination of the antidementia drugs rivastigmine and donepezil in wastewater and human plasma samples. This method, which is based on two consecutive dispersive microextractions, is performed in 7 min. In the method, using a fast back-extraction step, the applicability of the dispersive microextraction methods in complicated matrixes is conveniently improved. This step can be performed in less than 2 min, and very simple tools are required for this purpose. To achieve the best extraction efficiency, optimization of the variables affecting the method was carried out. Under the optimized experimental conditions, the relative standard deviations for the method were in the range of 6.9-8.7%. The calibration curves were obtained in the range of 2-1100 ng/mL with good correlation coefficients, higher than 0.995, and the limits of detection ranged between 0.5 and 1.0 ng/mL.

Section: Introductionmentioning

confidence: 99%

Simple determination of some antidementia drugs in wastewater and human plasma samples by tandem dispersive liquid–liquid microextraction followed by high‐performance liquid chromatography

Mirparizi

Rajabi

Asghari

2018

“…Pyrethroids are one of the broad pesticides that are widely used in agriculture (vegetables, fruit, and grains) and household ornaments as pest control agents . For a long time, the use of pyrethroids, including fenpropathrin , cyhalothrin , and τ‐fluvalinate (FL) has instantly increased resulting from the rapid demand of agricultural products and decoration . Hence, their residual constantly entered into biological systems, and a series of issues caused neurologic disorder of human resulting in loss of consciousness and seizure .…”

Section: Introductionmentioning

confidence: 99%

Synthesis of molecularly imprinted dye‐silica nanocomposites with high selectivity and sensitivity: Fluorescent imprinted sensor for rapid and efficient detection of τ‐fluvalinate in vodka

Wang

Cheng

et al. 2018

An imprinted fluorescent sensor was fabricated based on SiO nanoparticles encapsulated with a molecularly imprinted polymer containing allyl fluorescein. High fluorine cypermethirin as template molecules, methyl methacrylate as functional monomer, and allyl fluorescein as optical materials synthesized a core-shell fluorescent molecular imprinted sensor, which showed a high and rapid sensitivity and selectivity for the detection of τ-fluvalinate. The sensor presented appreciable sensitivity with a limit of 13.251 nM, rapid detection that reached to equilibrium within 3 min, great linear relationship in the relevant concentration range from 0 to 150 nM, and excellent selectivity over structural analogues. In addition, the fluorescent sensor demonstrated desirable regeneration ability (eight cycling operations). The molecularly imprinted polymers ensured specificity, while the fluorescent dyes provided the stabile sensitivity. Finally, an effective application of the sensor was implemented by the detection of τ-fluvalinate in real samples from vodka. The molecularly imprinted fluorescent sensor showed a promising potential in environmental monitoring and food safety.

“…SUPRAS is a term dedicated to water‐immiscible liquids consisting supramolecular assemblies dispersed in a continuous phase. The term SUPRAS is used to discriminate between these solvents and others adopting the self‐assembly point of view process through which they are formed and noncovalent interaction by which molecules are held together in this solvent . SUPRAS are produced from amphiphiles solutions by two clear self‐assembly processes occurring on two scales, molecular and nano.…”

Section: Introductionmentioning

confidence: 99%

“…As a result, extraction is limited to some defined analytes. Recently, our research group introduced a new generation of SUPRAS based on propanol/gemini surfactant to expand the scope of SUPRAS and to handle the problems of the previous SUPRASs .…”

Section: Introductionmentioning

confidence: 99%

Nanostructured gemini‐based supramolecular solvent coupled with ultrasound‐assisted back extraction as a preconcentration step before GC–MS

Feizi

Yamini

Moradi

et al. 2017

Self Cite

Liquid-phase microextraction based on gemini-based supramolecular solvent was successfully applied as a preconcentration step before gas chromatography with mass spectrometry. To eliminate the interferences of gemini surfactant, the analytes were back-extracted into an immiscible organic solvent in the presence of ultrasonic sound waves. Three phthalate esters (di-n-butyl-, butylbenzyl-, bis(2-ethylhexyl)-, and di-n-octyl phthalatic esters) were used as target analytes. The effective parameters on extraction efficiency of the target analytes (i.e., the amount of surfactant and volume of propanol as major components making up the supramolecular solvent, ionic strength, hexane volume, and ultrasound time) were investigated and optimized by a one-variable-at-a-time method. Under the optimum conditions, the preconcentration factors of the analytes were in the range of 95-182. The linear dynamic range of 0.05-200.00 μg/L with a correlation of determination of (R ) ≥ 0.9935 was obtained. The proposed method had an excellent limit of detection (S/N = 3) of 0.01 for di-n-octyl and 0.02 μg/L for butylbenzyl- and di-n-butyl-phthalatic ester. Good relative recoveries in the range of 85.7-105.2% guaranteed the accuracy of the amount of phthalates distinguished in the nonspiked samples.