title: 23Na NMR studies of Na-DNA in the solid state.
abstract: 23Na MAS, CP/MAS and quadrupole nutation NMR spectra and the 23Na spin-lattice relaxation times in Na-DNA with and without competing species (Mg2+, ethidium bromide and [Ru(phen)3]2+) reveal the presence of two sodium sites with different NMR parameters. While in the presence of Mg2+, sodium resides far from the surface of the DNA molecule, ethidium bromide and [Ru(phen)3]2+ displace sodium closer towards the surface.
authors.affiliation: Department of Chemistry, University of Cambridge, UK.
authors.forename: H
authors.initials: H
authors.lastname: He
authors.forename: J
authors.initials: J
authors.lastname: Klinowski
authors.forename: G
authors.initials: G
authors.lastname: Saba
authors.forename: M
authors.initials: M
authors.lastname: Casu
authors.forename: A
authors.initials: A
authors.lastname: Lai
mesh_terms: D000818:Animals; D002417:Cattle; D004247:DNA / Q000737:chemistry*; D004996:Ethidium / Q000737:chemistry; D008274:Magnesium / Q000737:chemistry; D019906:Nuclear Magnetic Resonance, Biomolecular; D009690:Nucleic Acid Conformation; D012964:Sodium / Q000737:chemistry*
chemical_list: D004247:DNA; D012964:Sodium; D004996:Ethidium; D008274:Magnesium