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Infrared spectroscopy and theoretical studies on gas-phase protonated leu-enkephalin and its fragments: direct experimental evidence for the mobile proton.
The gas-phase structures of the protonated pentapeptide Leu-enkephalin and its main collision-induced dissociation (CID) product ions, b4 and a4, are investigated by means of infrared multiple-photonExpand
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Spectroscopic and theoretical evidence for oxazolone ring formation in collision-induced dissociation of peptides.
Infrared spectroscopy of the b4+ fragment of Leu-enkephalin demonstrates that the oxazolone ring is formed during collision-induced dissociation of protonated peptides, whereas the linear acyliumExpand
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Effect of peptide fragment size on the propensity of cyclization in collision-induced dissociation: oligoglycine b(2)-b(8).
The chemistry of peptide fragmentation by collision-induced dissociation (CID) is currently being reviewed, as a result of observations that the amino acid sequence of peptide fragments can changeExpand
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Infrared spectroscopy of diamondoid molecules: New insights into the presence of nanodiamonds in the interstellar medium
Although they are relatively different in band shape, infrared features around 3.4-3.5 μm in the emission spectra of HD 97048 and Elias 1 and in the absorption spectra of various dense clouds haveExpand
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Spectroscopic evidence for an oxazolone structure of the b2 fragment ion from protonated tri-alanine
Infrared multiple photon dissociation (IRMPD) spectroscopy is used to identify the structure of the b2+ ion generated from protonated tri-alanine by collision induced dissociation (CID). The IRMPDExpand
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Infrared spectroscopy of cationized lysine and epsilon-N-methyllysine in the gas phase: effects of alkali-metal ion size and proton affinity on zwitterion stability.
The gas-phase structures of protonated and alkali-metal-cationized lysine (Lys) and epsilon-N-methyllysine (Lys(Me)) are investigated using infrared multiple photon dissociation (IRMPD) spectroscopyExpand
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Infrared spectra of isolated protonated polycyclic aromatic hydrocarbon molecules
Gas-phase infrared (IR) spectra of larger protonated polycyclic aromatic hydrocarbon molecules, H+PAH, have been recorded for the first time. The ions are generated by electrospray ionization andExpand
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Gas-phase infrared multiple photon dissociation spectroscopy of mass-selected molecular ions
Abstract In this review, we present an overview of our recent work on the infrared spectroscopy of mass-selected gas-phase molecular ions. The ions are stored and isolated in a quadrupole ion trapExpand
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Reaction products in mass spectrometry elucidated with infrared spectroscopy.
  • N. Polfer, J. Oomens
  • Medicine, Chemistry
  • Physical chemistry chemical physics : PCCP
  • 17 July 2007
Determining the structure and dynamics of large biologically relevant molecules is one of the key challenges facing biology. Although X-ray crystallography (XRD) and nuclear magnetic resonance (NMR)Expand
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Hydrogen bonding and cooperativity in isolated and hydrated sugars: mannose, galactose, glucose, and lactose.
The conformation of phenyl-substituted monosaccharides (mannose, galactose, and glucose) and their singly hydrated complexes has been investigated in the gas phase by means of a combination of massExpand
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