Abstract
Fifteen fractions of aeromonas gum, a heteropolysaccharide produced by the strain Aeromonas nichidenii, have been studied by static light scattering and viscometry with dimethylsulfoxide containing 0.2 M LiCl at 25°C as the solvent. Data for the z-average radius of gyration and the intrinsic viscosity covering a molecular weight range from 4.5 × 105 to 2 × 106 show the polymer to behave like a semiflexible chain in this solvent, and are analyzed on the basis of the wormlike chain by coarse-graining the heteropolysaccharide molecule. It is shown that these data and those for the particle scattering function are consistently explained by this model with a (mean) persistence length of 10 (± 1) nm and a (mean) linear mass density of 1450 (± 100) nm−1, and that the heteropolysaccharide chain is as stiff as cellulose derivatives.
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