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Additional resources for Advances in Carbohydrate Chemistry and Biochemistry 47
38 STEPHEN J. '44 The method is eminently suitable for the separation of cyclitols and alditols from each other. Reports of such separations achieved on ion-exchange columns are too numerous to be listed here, but some typical examples are as follows. '~~ The sugars emerge from the column in the order listed here. Three compounds were found to emerge from the chromatographiccolumn much later than expected from their configurationsand from comparison with related compounds. It has been postulated that these compounds V.
Mo, T. J. Brobak, and I. R. , 145 (1985) 13-24. COMPLEXES OF METAL CATIONS WITH CARBOHYDRATES 25 23 A monosaccharide cannot provide more than three oxygen atoms for coordination to a cation, but a molecule containing two monosaccharide units (for example, a disaccharide) can offer a site for four- or five-fold coordination. The sixth example is a disaccharide especially synthesized in order to provide a site for five-fold coordination. In the a-D-allopyranosyl C U - D - ~ ~ ~ O pyranoside molecule, both moieties have an a,e,a sequence, and it was predicted that a cation would coordinateto five oxygen atoms.
Chem. Soc. , 49 ( 1976) 15 17 - 1520. STEPHEN J. ANGYAL 32 Alginate is a polymer consisting of a-L-gulopyranosyluronateand p-Dmannopyranosyluronate subunits; pectate consists of a-D-galactopyranosyluronate units, all (1 +4)-linked. The a-L-guluronate moiety has an a,e,a arrangement of oxygen atoms, rare in natural products. To explain the dramatic changes in the properties of alginic acid on addition of Caz+ions, Smidsrsd and coworkers119and, independently, Angyal,'*O suggested the formation of a complex (25) in which 0-4, 0-5, and 0-6 of a guluronate residue and 0-2 and 0-3 of a contiguous guluronate residue in the polymer chain are coordinated to Ca2+(0-4 of the first residue is 0-1 of the second).