By R. Stuart Tipson and Derek Horton (Eds.)
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Extra info for Advances in Carbohydrate Chemistry and Biochemistry 47
36 STEPHEN J. 1 M solution of lanthanum perchlorate. c. is more suitable for this purpose. Electrophoreticmobility is not strictly proportional to the extent of complex-formation; it depends also on the bulk and shape of the molecule, which influence ionic mobility. In particular, bulky substituents retard the passage of the complex ion through the electrolyte. c. 15 A somewhat similar method has been proposed by Bilisics and P e t r ~ S , ' ~ ~ namely, chromatographicseparation on 0-(carboxymethy1)cellulosepaper in the La3+,Ca2+,and Ba2+forms.
J. , 28 ( 1975) 1541 - 1549. S. J. Angyal and R. Le Fur, Curbohydr. , 126 (1984) 15-26. S. J. Angyal and R. J. Beveridge, Carbohydr. , 65 (1978) 229-234. S. J. Angyal and R. J. Beveridge, Aust. J. , 31 (1978) 115 I - 1 155. ” Thus, Dglycero-L-tulo-heptose (28) and ~-erythro-~-tulo-octose’~~ have been assumed to complex at 0-2,O-3, and 0-4, and also at 0-5,O-6, and 0-7; and methyl a-L-gulofuranoside(29) at 0-1,O-2, and 0-3, and also at 0-4,O-5, and 0-6. The side chain in the former compounds has the threo configuration.
Mills, Curbohydr. Rex, 45 (1975) 73-83. COMPLEXES OF METAL CATIONS WITH CARBOHYDRATES 43 former. Hence, cation complexes of monosaccharides are unlikely to have any biological significance. Complexing is more likely to occur on the surface of polysaccharides, especially on cell walls. It is widely believed that cation- carbohydratecomplexes play a role in the transport of cations through membranes, although details of this process are not known. Neutral polysaccharides may form complexes with cations to a significant extent: change in its optical rotation on addition of cations indicates that dextran does It has been pointed out that, even if a sugar does not form a complex, a polymeric chain of the same sugar may do so, due to cross-linking; this has been well establishedfor acidic p o l y s a ~ c h a r i d e s , ~but ~ ~may * ' ~ ~also be true for neutral ones.
Advances in Carbohydrate Chemistry and Biochemistry 47 by R. Stuart Tipson and Derek Horton (Eds.)