Rapid-scan EPR of immobilized nitroxides

Zhelin Yu, Richard W. Quine, George A. Rinard, Mark Tseitlin, Hanan Elajaili, Velavan Kathirvelu, Laura J. Clouston, Przemysław J. Boratyński, Andrzej Rajca, Richard Stein, Hassane McHaourab, Sandra S. Eaton, Gareth R. Eaton

Research output: Contribution to journalArticlepeer-review

17 Scopus citations


X-band electron paramagnetic resonance spectra of immobilized nitroxides were obtained by rapid scan at 293 K. Scan widths were 155 G with 13.4 kHz scan frequency for 14N-perdeuterated tempone and for T4 lysozyme doubly spin labeled with an iodoacetamide spirocyclohexyl nitroxide and 100 G with 20.9 kHz scan frequency for 15N-perdeuterated tempone. These wide scans were made possible by modifications to our rapid-scan driver, scan coils made of Litz wire, and the placement of highly conducting aluminum plates on the poles of a Bruker 10″ magnet to reduce resistive losses in the magnet pole faces. For the same data acquisition time, the signal-to-noise for the rapid-scan absorption spectra was about an order of magnitude higher than for continuous wave first-derivative spectra recorded with modulation amplitudes that do not broaden the lineshapes.

Original languageEnglish (US)
Pages (from-to)67-71
Number of pages5
JournalJournal of Magnetic Resonance
StatePublished - Oct 2014


  • EPR Sucrose octaacetate glass
  • Immobilized nitroxide
  • Litz wire coils
  • Rapid scan
  • Trehalose glass

ASJC Scopus subject areas

  • Biophysics
  • Biochemistry
  • Nuclear and High Energy Physics
  • Condensed Matter Physics


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