Rm. Keith et al., A C-13 SOLID-STATE NMR-STUDY OF ION-EXCHANGE RESINS DERIVED FROM NATURAL POLYSACCHARIDES, Carbohydrate research, 262(2), 1994, pp. 185-194
Several ion-exchange resins and resin precursor materials formed from
natural polysaccharides have been examined by solid-state NMR spectros
copy. NMR spectra of the dry resin contained broad, featureless bands
due to the polysaccharide backbone of the resin and additional broad b
ands due to attached groups. On addition of water to the resin, the re
sonances for the polysaccharide backbone remained broad, but those due
to the attached groups were considerably sharpened. Many individual r
esonances of the attached groups could thus be assigned, so that chang
es brought about by chemical modification of the polysaccharide during
the production of an ion-exchange resin could be followed.