Polypyrrole/polyamide electrospun‐based sorbent for microextraction in packed syringe of organophosphorous pesticides from aquatic samples

Abstract

A novel method based on microextraction in packed syringe (MEPS) as sample preparation technique coupled off-line with gas chromatography-mass spectrometry was developed using electrospun nanofibers as sorbent. For electrospinning of polypyrrole/polyamide-based nanofiber, a homogeneous solution containing nylon 6, ferric chloride and pyrrole monomer was prepared and then was drawn into a 2.5-mL syringe. By applying a voltage of 13 kV between the needle of the syringe and an aluminum-foil collector, the nanofibers could be formed on the surface of the collector. The prepared sheet was used as the sorbent for MEPS to analyze some selected organophosphorous pesticides. Important parameters influencing the extraction and desorption processes were optimized. Limits of detection were in the range of 0.04-0.1 ng/mL using time scheduled selected ion monitoring mode, and the relative standard deviation (RSD %) values with four replicates were in the range of 3.7-11.8% at a concentration level of 5 ng/mL. The linearity of the method was in the range of 0.5-500 ng/mL for diazinon and fenithrothion and 0.5-200 ng/mL for the rest of the analytes. The developed method was successfully applied to Zayandeh-roud river water samples, whereas the matrix factors were in the range of 0.87-0.98.

Microextraction by packed sorbent (MEPS)

“…Also, the use of polypyrrole or polyamide electrospun-based sorbents in MEPS has created a new approach, which was successfully used for separating pesticides from aquatic samples [47].…”

Electrospun nanofiber sorbents for the pre-concentration of urinary 1-hydroxypyrene

“…This means that the contact time is an important parameter in selecting a suitable sorbent. Sorbent with higher hydrophilic functional groups would be expected to adsorb the analyte faster due to more effective sorbent-analyte interaction resulting from increase in mass transfer (Xu et al 2010a;Xu et al 2010b;Qi et al 2008;Bagheri et al 2012). This suggests that the hydrophilic functional groups like amide and carboxylic groups on some of the sorbents did contribute greatly to the rapid sorption of 1-hydroxypyrene.…”

“…More so, the aromatic rings of the matrix network on SDVB permits the electron-donor interactions between the sorbent and the bonds of the aromatic analyte. This further increases the analyte-sorbent interaction (Bagheri et al 2012;Marce and Borrull 2000) which is a likely reason for its high sorption recovery of slightly over 70% as well. Furthermore, the -OH groups on the surface of the analyte can act as a hydrogen-bonding donor and form hydrogen bonds with organic molecules (Marce and Borrull 2000), indicating that hydrogen bonding interactions could as well be playing a role in the SDB sorption system.…”

Recent Developments and Applications of Microextraction Techniques for the Analysis of Pesticide Residues in Fruits and Vegetables

“…The solid phase is washed with water or with other solvents in the case of water soluble analytes, to remove any interfering materials and the analytes are eluted with a microliter volume of organic solvent. The technique was recently used for the analysis of multiclass pesticides in water samples [131,132], but till today it has not been used for fruits and vegetables analysis. It presents a good and promising microextraction technique for the analysis of a broad range of pesticides in food samples.…”