title: Aqueous-phase quantitative NMR determination of amino acid enantiomer ratio by 13C-NMR using chiral neodymium shift reagent.
abstract: A neodymium-(S)-PDTA (PDTA = N,N,N',N'-tetrakis[(hydroxycarbonyl)methyl]-1,2-diaminopropane) complex was found exceptionally useful in the quantitative determination of enantiomer ratios of water-soluble natural amino acids by (13)C-NMR. The method is demonstrated on mixtures of L- and D-enantiomers of various amino acids. The interactions of the chiral shift reagent with the amino acid molecules were rationalized by molecular orbital calculations.
authors.affiliation: Department of Chemistry, University of Modena and Reggio Emilia, Via Campi 183, 41100, Modena, Italy.
authors.forename: Nicola
authors.initials: N
authors.lastname: Florini
authors.forename: Francesco
authors.initials: F
authors.lastname: Faglioni
authors.forename: Claudia
authors.initials: C
authors.lastname: Zucchi
authors.forename: Luciano
authors.initials: L
authors.lastname: Caglioti
authors.forename: Gyula
authors.initials: G
authors.lastname: Pályi
mesh_terms: D000596:Amino Acids / Q000032:analysis* / Q000737:chemistry; D007202:Indicators and Reagents / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy / Q000379:methods*; D008958:Models, Molecular; D009354:Neodymium / Q000737:chemistry*; D013237:Stereoisomerism
chemical_list: D000596:Amino Acids; D007202:Indicators and Reagents; D009354:Neodymium