Solid-state near-edge X-ray absorption fine structure spectra of glycine in various charge states

Article Abstract:

The experimental solid-state near-edge X-ray absorption fine structure (NEXAFS) spectra for a series of glycine-related samples of alpha-glycine, beta-glycine, glycinium chloride, glycinium trifluoroacetate and sodium glycinate were compared. An assignment of spectral features for alpha-glycine is proposed on the basis of extended theoretical simulations of polarization-dependent spectra performed within the real-space multiple-scattering formalism.

Spectra, Solid state chemistry, Glycine, X-ray analysis

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NEXAFS spectroscopy of homopolypeptides at all relevant absorption edges: polyisoleucine, polytyrosine, and polyhistidine

Article Abstract:

The calibrated high-resolution low-noise near-edge X-ray absorption fine structure spectra of three homopolypeptides, such as polyisoleucine, polytyrosine and polyhistidine, are compared with the respective spectra of parent amino acids and glycine-derived cyclic dipeptide. The results have helped in improving the procedures of empirical simulation of protein spectra within the building-block approach.

Isoleucine, Tyrosine metabolism

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Surface chemistry of ultrathin films of histidine on gold as probed by high-resolution synchrotron photoemission

Article Abstract:

Various procedures for the vacuum deposition of thin histidine films on polycrystalline Au(111) and their characterization with high-resolution synchrotron-radiation-based photoelectron spectroscopy are reported. Water adsorption on pre-prepared film at 100 K results in protonation of histidine molecules and partial formation of hydroxyl anions.

Usage, Photoelectron spectroscopy, Silver compounds, Chemical properties

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