By R. Stuart Tipson and Derek Horton (Eds.)

ISBN-10: 0120072475

ISBN-13: 9780120072477

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Extra info for Advances in Carbohydrate Chemistry and Biochemistry 47

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Pat. 4,024,331 (1977); Chem. , 87 (1977) 184,896. 40 STEPHEN J. 161There are, however, between such predictions and the actual separations, some discrepancieswhich indicate that the retention on the column is also affected by geometric constraints imposed by pore geometries and by the position of the cation in the zeolite. 3. c. of carbohydrates, those containing a cation-exchange resin are probably the most useful. c. columns filled with the calcium form of an ion-exchangeresin are marketed specially for carbohydrate analyses.

They move rapidly and produce more diffuse spots. '33 (128) L. W. Jacques, B. F. Riesco and W. , Curbohydr. , 83 (1980) 21 -32. (129) R. B. Martin, Metal Ions Biol. , 17 (1984) 1-49. (130) M. E. Daman and K. Dill, Curbohydr. Rex, 102 (1982)47-57. (131) K. Luthman, A. Claesson, L. Kenne, and I. Cdregh, Carbohydr. Rex. 170 (1987) 167-179. (132) P. -J. Pen& and A. S. Perlin, Curbohydr. , 168 (1987) 163- 179. (133) M. E. Tate, personal communication. 36 STEPHEN J. 1 M solution of lanthanum perchlorate.

It is possible, therefore, that 0-4 is not involved in the complex-formation of Caz+with D-galacturonic acid, and yet it is involved in that with the polymer chain, together with one or two hydroxyl groups of the adjacent pyranose unit. The strength of complexformation is affected by the length of the polyguluronate chain123; complexformation is, therefore, enhanced by the steric arrangement of the polymer chain. In the widely accepted structure, denoted as the “egg-box” model,124 of calcium alginate and pectate, two buckled polymer chains are close to each other, forming cavities in which the cation is situated, holding the two chains together by chelation.

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Advances in Carbohydrate Chemistry and Biochemistry 47 by R. Stuart Tipson and Derek Horton (Eds.)

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