Composition, sequence, and conformation of polymers and oligomers of glucose as revealed by carbon-13 nuclear magnetic resonance

Experimental chemical shift correlation maps from heteronuclear two-dimensional nuclear magnetic resonance spectroscopy. II: Carbon-13 and proton chemical shifts of a-D-glucopyranose oligomers

“…Several assignments have been proposed for maltose (2) and maltotriose (3) (16,19,20), but the experimental results obtained suggest a minor adjustment to the assignment of maltose, and a fairly radical reinterpretation of the 'During the reparation of this paper Heyraud el ,a/. the C-2' and C-5' assignmenis is borne out by the (Biopolymers, 18, 167 (1979)) have published carbon-13 assignments for maltose and maltotriose identical to those derived of the reassigned C-2' here; we thank a referee for drawing this paper to our attention.…”

Detection of Kestoses and Kestose-Related Oligosaccharides in Extracts of Festuca arundinacea, Dactylis glomerata L., and Asparagus officinalis L. Root Cultures and Invertase by 13C and 1H Nuclear Magnetic Resonance Spectroscopy

“…oligosaccharides, these techniques are substantially less sensitive. NMR, however, represents a sensitive technique for examining isomeric mixtures of saccharides such as these, and data have been reported for levans and inulin (15), as well as for a number of other fructofuranosyl containing saccharides (4,9,22,23,27). In a previous paper (1 1), we reported an evaluation of this technique using A. officinalis L. root extracts as the source of the saccharides, and have assigned the anomeric carbon and proton signals for both 1-kestose and neokestose.…”

Structural investigation of water-hyacinth (Eichhornia crassipes) polysaccharides. Part I. Water-soluble polysaccharides

“…The chemical shift of C-1 at 93.80 ppm should be attributed to a-D-galactopyranose residues at the nonreducing ends, and that at 102.3 ppm to (1+4)-linked f3-D-mannopyranose residues, by comparison with previous data (15,16). The chemical shift at 69.81 should be due to the 0-substituted C-6 of f3-(1+4) D-mannose residues, and the peak at 75.52 ppm could be assigned as the C-4 of f3-(1+4) D-mannopyranose residues, as deduced from the data for f3-(1+4)-linked D-glucan (17).…”