title: High resolution 1H NMR structural studies of sucrose octaacetate in supercritical carbon dioxide.
abstract: High pressure (HP), high resolution (HR), proton nuclear magnetic resonance (1H NMR) spectroscopy has been utilized for the first time to investigate the solution structure of a carbohydrate based system, sucrose octaacetate (SOA), in supercritical CO2. The studies indicate that the average solution state conformation of the alpha-D-Glucopyranosyl ring of SOA in scCO2 medium is consistent with the 4C1 chair form, while the beta-D-fructofuranosyl ring adopts an envelope conformation. The investigations also suggest that scCO2 is a promising medium to study the solution structure and conformation of acetylated sugar systems. Spectral manifestations of a specific interaction between the acetate methyl protons and CO2 molecules are also presented.
authors.affiliation: Department of Chemistry, Kenan and Venable Laboratories, University of North Carolina, Chapel Hill, 27599-3290, USA.
authors.forename: Baby
authors.initials: B
authors.lastname: Chandrika
authors.forename: Laura K
authors.initials: LK
authors.lastname: Schnackenberg
authors.forename: Poovathinthodiyil
authors.initials: P
authors.lastname: Raveendran
authors.forename: Scott L
authors.initials: SL
authors.lastname: Wallen
mesh_terms: D000107:Acetylation; D002245:Carbon Dioxide; D025924:Chromatography, Supercritical Fluid; D006860:Hydrogen Bonding; D009682:Magnetic Resonance Spectroscopy; D008958:Models, Molecular; D008968:Molecular Conformation; D012997:Solvents; D013395:Sucrose / Q000031:analogs & derivatives* / Q000737:chemistry
chemical_list: D012997:Solvents; C026879:sucrose octaacetate; D002245:Carbon Dioxide; D013395:Sucrose