title: Structural and spectroscopic analysis of hydrogensquarates of glycine-containing tripeptides.
abstract: The hydrogensquarates of glycine-containing tripeptides glycylglycylglycine (H-Gly-Gly-Gly-OH), glycylglycylmethionine (H-Gly-Gly-Met-OH), and methionylglycylglycine (H-Met-Gly-Gly-OH) have been characterized structurally. Quantum chemical ab initio calculations, solid-state linear-dichroic infrared (IR-LD) spectroscopy, 1H and 13C NMR data, ESI-MS, HPLC-MS/MS, TGV, and DSC methods were employed. The structures consist in a positively charged peptide moiety and a negative hydrogensquarate anion (HSq), stabilized by strong intermolecular hydrogen bonds.
authors.affiliation: Sofia University St. Kl. Ohridsky Faculty of Chemistry, Department of Analytical Chemistry, 1164 Sofia, Bulgaria.
authors.forename: Bojidarka B
authors.initials: BB
authors.lastname: Koleva
authors.forename: Tsonko M
authors.initials: TM
authors.lastname: Kolev
authors.forename: Michael
authors.initials: M
authors.lastname: Spiteller
mesh_terms: D002152:Calorimetry, Differential Scanning; D002851:Chromatography, High Pressure Liquid; D005998:Glycine / Q000737:chemistry*; D006860:Hydrogen Bonding; D013058:Mass Spectrometry; D008715:Methionine / Q000737:chemistry; D015394:Molecular Structure; D008970:Molecular Weight; D019906:Nuclear Magnetic Resonance, Biomolecular; D009842:Oligopeptides / Q000737:chemistry*; D011487:Protein Conformation; D011522:Protons; D019032:Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization; D013055:Spectrophotometry, Infrared; D013818:Thermogravimetry
chemical_list: D009842:Oligopeptides; D011522:Protons; D008715:Methionine; D005998:Glycine