Polyelectrolyte properties of a plant and animal polysaccharide |
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Authors: | Marguerite Rinaudo |
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Institution: | (1) Joseph Fourier University and CERMAV-CNRS, BP 53-38041 Grenoble cedex 9, France |
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Abstract: | The principal properties of polyelectrolytes in aqueous solution are reviewed; experimental data obtained about polysaccharides
in our laboratory identify the main electrostatic interactions which occur between macromolecular chains, between ionic sites
on isolated chains or between counterions and polyelectrolytes. Two examples are described. Hyaluronan, a linear alternated
copolymer type with one anionic site per repeat unit, is very soluble in water, with a persistence length around 8 nm and
a rheological behavior directly related to the molecular weight and polymer concentration in the presence of external monovalent
electrolyte. The second example is that of pectin for which the influence of the charge density is studied. It exhibits an
important ionic selectivity among divalent counterions in dilute solution with a dimer formation followed by aggregation and
gelation. |
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Keywords: | Polyelectrolyte Activity of counterion Intrinsic pK Ionic selectivity Conformation Electrostatic interactions |
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