Carbon edge XANES spectroscopy of amino acids and peptides

J. Boese, A. Osanna, C. Jacobsen*, J. Kirz

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

119 Scopus citations

Abstract

Carbon edge X-ray absorption near-edge structures (XANES) of amino acids and small peptides have been investigated for the first time. Because of the heat sensitivity of the samples, gas phase spectroscopy of evaporated samples is difficult. Therefore they were analyzed in solid form as thin films. Quantitative absorption measurements require the region of the sample which is illuminated to be of uniform thickness. For this reason a special sample preparation technique was used, and the spectra were taken using the small spot size of the Stony Brook scanning transmission X-ray microscope, which is operated at the National Synchrotron Light Source at Brookhaven National Laboratory. Carbon K-edge XANES spectra of six amino acid monomers, four dipeptides and one tripeptide were measured and compared. The results show that the peptide spectra can be explained as a sum of the spectra of the monomers they consist of. This indicates that the peptide bond has only a weak effect on the spectra. If this is true in general, it should be possible to predict XANES spectra of proteins from the spectra of the constituent amino acids. This could be used in protein specific imaging using X-ray microscopes.

Original languageEnglish (US)
Pages (from-to)9-15
Number of pages7
JournalJournal of Electron Spectroscopy and Related Phenomena
Volume85
Issue number1-2
DOIs
StatePublished - Jul 1 1997

Keywords

  • Amino acids
  • NEXAFS
  • Peptides
  • X-ray microscopy
  • XANES

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Radiation
  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics
  • Spectroscopy
  • Physical and Theoretical Chemistry

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