High resolution 1H NMR structural studies of sucrose octaacetate in supercritical carbon dioxide |
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Authors: | Chandrika Baby Schnackenberg Laura K Raveendran Poovathinthodiyil Wallen Scott L |
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Affiliation: | Department of Chemistry, Kenan and Venable Laboratories, University of North Carolina, Chapel Hill, 27599-3290, USA. |
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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. |
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Keywords: | carbohydrates NMR spectroscopy sucrose supercritical fluids |
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