title: Combined liquid chromatography/electron paramagnetic resonance spectrometry/electrospray ionization mass spectrometry for radical identification.
abstract: Electron paramagnetic resonance (EPR) spectrometry and mass spectrometry (MS) have been coupled together on-line with liquid chromatography (LC)/UV detection. These combined techniques have been applied to the determination of spin-trapped radical adducts, including phenyl, 2-, 3-, and 4-chlorophenyl, and 2-bromophenyl radicals trapped with alpha-(1-oxo-4-pyridyl)-N-tert-butylnitrone (4-POBN), and phenyl radicals trapped with 2-methyl-2-nitrosopropane (MNP), alpha-phenyl-N-tert-butylnitrone (PBN), and 5,5-dimethyl-1-pyrroline N-oxide (DMPO). Oxidized and reduced forms of the radical adducts were also detected by the on-line LC/EPR/MS system.
authors.affiliation: Laboratory of Molecular Biophysics, National Institute of Environmental Health Sciences, Research Triangle Park, North Carolina 27709.
authors.forename: H
authors.initials: H
authors.lastname: Iwahashi
authors.forename: C E
authors.initials: CE
authors.lastname: Parker
authors.forename: R P
authors.initials: RP
authors.lastname: Mason
authors.forename: K B
authors.initials: KB
authors.lastname: Tomer
mesh_terms: D002853:Chromatography, Liquid; D004578:Electron Spin Resonance Spectroscopy; D005609:Free Radicals / Q000737:chemistry*; D013058:Mass Spectrometry; D013056:Spectrophotometry, Ultraviolet
chemical_list: D005609:Free Radicals