Direct molecular imprinting technique to synthesize coated electrospun nanofibers for selective solid-phase microextraction of chlorpyrifos
Molecularly imprinted-electrospun nanofibers based on the use of poly(vinyl alcohol) were fabricated and used as a new sorbent for solid-phase microextraction of chlorpyrifos. The molecularly imprinted nanofibers were prepared by electrospinning and direct molecular imprinting of polymeric nanofibers. Poly(vinyl alcohol) was used as the functional and electrospun polymer. Chlorpyrifos was used as a template molecule, and glutaraldehyde as the cross-linker. Detection was performed by ion mobility spectrometry equipped with a secondary electrospray ionization source. The molecularly imprinted fiber has a selectivity and extraction efficiency better than the fiber fabricated using the conventional method of encapsulating MIP particles in electrospun nanofibers. Parameters affecting the extraction efficiency such as ionic strength, stirring rate, extraction time, and temperature were evaluated. The dynamic range of the method was in the range of 0.5–200 μg L−1 with the limit of detection of 0.1 μg L−1. The intra- and inter-day relative standard deviations of the method were 4 and 9%, respectively. The fiber-to-fiber reproducibility for three different fibers is 5%. The spiking recoveries from spiked apple, cucumber, and water samples were in the range of 82–112%.
KeywordsMolecularly imprinted-nanofibers Electrospinning Poly(vinyl alcohol) Ion mobility spectrometry Secondary electrospray ionization Organophosphorus pesticides Well water Agricultural wastewater Fruit samples
The research council of Isfahan University of Technology (IUT) and the Center of Excellence in Sensor and Green Chemistry are acknowledged for financial support of the project.
Compliance with ethical standards
The authors declare that they have no competing interests.
- 4.Xu J, Ouyang G (2017) Solid phase microextraction. Springer, Berlin HeidelbergGoogle Scholar
- 15.Xue X, Lu R, Li Y et al (2018) Molecularly imprinted electrospun nanofibers for adsorption of 2,4-dinitrotoluene in water. Analyst 143:3466–3471Google Scholar
- 24.Farajzadeh MA, Mohebbi A (2018) Development of magnetic dispersive solid phase extraction using toner powder as an efficient and economic sorbent in combination with dispersive liquid–liquid microextraction for extraction of some widely used pesticides in fruit juices. J Chromatogr A 1532:10–19CrossRefGoogle Scholar