title: The determination of ionic bonding interactions of N-phenyl glycine and N-(2-hydroxy-3-methacryloxypropyl)-N-phenyl glycine as measured by carbon-13 NMR analysis.
abstract: The purpose of the present investigation was to determine whether high-resolution carbon-13 nuclear magnetic resonance could be utilized for detection of ionic bonding interactions of NPG and NPG-GMA with selected inorganic cations. The C1-carbonyl carbon of NPG and NPG-GMA were labeled with 13C to help magnify the spectral response signal. The labeled monomers were allowed to react with Ca(OH)2 and LiOH. The C-13 carbonyl resonance was observed by solution- and solid-state NMR. The interaction of the cations in solution and on a powered glass support resulted in a downfield chemical shift of about 2-5 ppm, indicating the presence of a chemical interaction between the monomer and the cations. The reaction of the monomers with the solid substrates of hydroxyapatite, and bovine dentin did not result in a significant downfield shift in the carbonyl resonance. The results provide evidence that high-resolution nuclear magnetic resonance can be used for evaluation of chemical bonding interactions of dental adhesives with inorganic ions.
authors.affiliation: School of Dentistry, University of California, Section of Oral Biology, Los Angeles 90024-1668.
authors.forename: L E
authors.initials: LE
authors.lastname: Wolinsky
authors.forename: R W
authors.initials: RW
authors.lastname: Armstrong
authors.forename: R R
authors.initials: RR
authors.lastname: Seghi
mesh_terms: D002247:Carbon Isotopes; D001840:Dental Bonding / Q000379:methods*; D017220:Dentin-Bonding Agents / Q000737:chemistry*; D005998:Glycine / Q000031:analogs & derivatives / Q000737:chemistry; D007474:Ion Exchange; D009682:Magnetic Resonance Spectroscopy; D008689:Methacrylates / Q000737:chemistry; D013501:Surface-Active Agents / Q000737:chemistry*
chemical_list: D002247:Carbon Isotopes; D017220:Dentin-Bonding Agents; D008689:Methacrylates; D013501:Surface-Active Agents; C021316:N-phenylglycine; C008691:NPG-GMA; D005998:Glycine