Solid-state 17O NMR in carbohydrates

Solid-state 170 magic-angle spinning nuclear magnetic resonance measurements at 19.5 Tesia were performed on O-17-enriched methyl alpha-D-galactopyranoside (4-O-17), methyl P-D-glucopyranoside (2-O-17), methyl alpha-D-glucopyranoside (4-O-17), methyl (X-D-glucopyranoside (6-O-17), and alpha-D-glucopyranosyl (1 -> 6) alpha-D-glucopyranoside (6- 170). The O-17 quadrupolar coupling constants and asymmetry parameters measured can be predicted with a model based entirely on the first-coordination sphere around oxygen. For the hydroxyl sites observed in the methyl glucosides, the quadrupolar coupling parameters are nearly identical, within 10% as predicted, given their nearly identical first-coordination sphere structures. (c) 2006 Published by Elsevier B.V.