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This study identifies ethyl and pentyl radical adducts using 4-POBN spin trapping. Combined HPLC-EPR and HPLC-MS techniques successfully determined these radical adducts.

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Area of Science:

  • Analytical Chemistry
  • Organic Chemistry

Background:

  • Spin trapping is crucial for detecting short-lived radicals.
  • 4-POBN (4-pyridyl-l-oxide-N-tert-butyl-nitrone) is a spin trap used for radical adduct formation.

Purpose of the Study:

  • To determine ethyl and pentyl radical adducts using 4-POBN.
  • To evaluate the efficacy of combined HPLC-EPR and HPLC-MS for radical adduct analysis.

Main Methods:

  • High-Performance Liquid Chromatography (HPLC) coupled with Electron Paramagnetic Resonance (EPR) spectroscopy.
  • HPLC coupled with Electrospray Ionization (ESI)-Mass Spectrometry (MS) and Thermospray Ionization (TSP)-MS.

Main Results:

  • Successful determination of 4-POBN radical adducts of ethyl and pentyl radicals.
  • HPLC-EPR confirmed peak identification under identical chromatographic conditions as HPLC-MS.
  • Both ESI-MS and TSP-MS techniques were capable of detecting the radical adducts.

Conclusions:

  • The combination of HPLC-EPR and HPLC-MS is effective for identifying and quantifying spin-trapped radical adducts.
  • This methodology allows for the characterization of transient radical species in complex mixtures.