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Polyacrylonitrile/MIL-53(Fe) electrospun nanofiber for pipette-tip micro solid phase extraction of nitrazepam and oxazepam followed by HPLC analysis

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Abstract

Nanofibers were prepared from a nanocomposite consisting of polyacrylonitrile and a metal-organic framework of type MIL-53(Fe) by electrospinning. They are shown to be a viable sorbent for pipette-tip solid-phase extraction for the extraction of the benzodiazepine drugs nitrazepam and oxazepam. The nanofibers were characterized by scanning electron microscopy, energy dispersive X-ray spectroscopy, Fourier transform infrared spectroscopy and X-ray diffraction. The effects of sample pH value and volume, composition, and amount of electrospun nanofibers, the number of adsorption cycles and the type and volume of the eluent were optimized. Following extraction the drugs were quantified by HPLC. Under the optimized conditions, response is linear for both drugs in the 5.0–1000 ng mL−1 concentration range. The limits of detection for oxazepam and nitrazepam are 1.5 and 2.5 ng mL−1, respectively, and the relative standard deviations at the levels of 50, 100 and 250 ng mL−1 (for n = 3) are ≤7.6%. The method was successfully applied for determination of drugs in spiked wastewater and biological fluids.

Schematic representation of polyacrylonitrile/MIL-53(Fe) composite nanofiber synthesis by electrospinning, and the use of them as the sorbent in pipette-tip microsolid-phase extraction (PT–μSPE) for the preconcentration of Nitrazepam and Oxazepam before HPLC–DAD analysis.

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Correspondence to Homeira Ebrahimzadeh.

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Amini, S., Ebrahimzadeh, H., Seidi, S. et al. Polyacrylonitrile/MIL-53(Fe) electrospun nanofiber for pipette-tip micro solid phase extraction of nitrazepam and oxazepam followed by HPLC analysis. Microchim Acta 187, 152 (2020). https://doi.org/10.1007/s00604-020-4112-3

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Keywords

  • Composite nanosorbent
  • Miniaturization
  • Metal organic framework
  • Sample preparation
  • Microextraction
  • Benzodiazepines
  • Biological fluid
  • Waste water analysis