Abstract
Carbonyl carbon resonances have been assigned to specific acetyl substituents in peracetylated derivatives of a variety of di- and tri-saccharides that occur as substructures of N- and O-linked glycoprotein glycans. Assignments were made by correlating shifts of these resonances to previously assigned pyranoid-ring proton and acetyl methyl proton shifts by means of 2D 13C— 1H shifts correlation spectra. It was found that, when the shift assignment data for carbonyl carbon atoms, acetyl methyl protons, and pyranoid-ring protons are plotted in three dimensions, patterns appear that are unique to the different types of residues occurring in a parent structure. It is suggested that these shift data can complement existing 1H- and 13C-n.m.r. methods for determining primary structures of complex carbohydrates.
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