title: A combined 17O RAPT and MQ-MAS NMR study of L-leucine.
abstract: We report the application of rotor-assisted population transfer (RAPT) to measure the quadrupolar coupling constant (C(q)) for spin 5/2 nuclei. Results from numerical simulations are presented on the magnitude of enhancement factor as a function of frequency offsets, i.e. the RAPT profile. Experimental O17 RAPT profile is traced for the amino acid L-leucine. In addition, results from MQ-MAS experiments are incorporated to determine the quadrupolar asymmetry parameter (eta(q)). Unlike previous reports, the O17 NMR parameters for an amino acid, L-leucine, is reported at a relatively low field of 9.4 T.
authors.affiliation: Department of Chemistry, The Ohio State University, 120 W. 18th Avenue, Columbus, OH 43210-1173, USA.
authors.forename: Subramanian
authors.initials: S
authors.lastname: Prasad
authors.forename: Ted M
authors.initials: TM
authors.lastname: Clark
authors.forename: Ramesh
authors.initials: R
authors.lastname: Sharma
authors.forename: Hyung-Tae
authors.initials: HT
authors.lastname: Kwak
authors.forename: Philip J
authors.initials: PJ
authors.lastname: Grandinetti
authors.forename: Herbert
authors.initials: H
authors.lastname: Zimmermann
mesh_terms: D000465:Algorithms; D003198:Computer Simulation; D007930:Leucine / Q000032:analysis* / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy / Q000379:methods*; D008956:Models, Chemical; D010103:Oxygen Isotopes / Q000032:analysis* / Q000737:chemistry*
chemical_list: D010103:Oxygen Isotopes; D007930:Leucine