Abstract
Polysaccharide physical properties may be traced to various levels of molecular organisation. Individual sugar rings in the covalent sequence, or primary structure, are essentially rigid, and chain geometry (secondary structure) is determined by their relative orientations. Chain flexibility is restricted by non-bonded interactions between adjacent residues, thus leading to extended coil dimensions, and high solution viscosity. In the solid state most polysaccharides adopt ordered tertiary structures such as nested ribbons or double helices. These may persist in solution, or as the fundamental structural unit in gels, and frequently show co-operative order-disorder behaviour. Tertiary structures may further associate to build up higher levels of organisation (quaternary structure). Changes in structural organisation may be monitored chiroptically, rheologically, calorimetrically, or by changes in molecular weight or n.m.r. relaxation behaviour, all of which may, in principle, be used as probes for kinetic studies.
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Morris, E.R. (1979). Polysaccharide Conformation and Interactions in Solutions and Gels. In: Gettins, W.J., Wyn-Jones, E. (eds) Techniques and Applications of Fast Reactions in Solution. NATO Advanced Study Institutes Series, vol 50. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-9490-4_52
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DOI: https://doi.org/10.1007/978-94-009-9490-4_52
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