Carbon atoms, chemical shifts effect monosaccharide

Experience has indicated that the chemical shifts of the monosaccharides are similar to those of the monosaccharide residues within the polysaccharide, except for substituent effects.37,38 These effects, caused by the attachment of any substituent to a sugar moiety, cause an increase in the chemical shift of the carbon atom directly involved in the linkage this increase is usually accompanied by a decrease of smaller magnitude (or, sometimes, an increase) in the chemical shifts... 

The limited dispersion of internuclear orientations of CH vectors between directly bonded carbon and proton atoms in monosaccharide rings means that additional types of RDCs such as DHh> "D< h, and Dcc are required for proper analysis of RDCs. The demand on the number and accuracy of measured RDCs increases for flexible carbohydrates. Attention must be paid to higher order effects caused by the narrow range of 1H chemical shifts of carbohydrates. 

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