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Physicochemical studies on xylinan (acetan). II. Characterization by static light scattering

✍ Scribed by Gisela Berth; Herbert Dautzenberg; Bjørn E. Christensen; Olav Smidsrød

Publisher
Wiley (John Wiley & Sons)
Year
1998
Tongue
English
Weight
577 KB
Volume
39
Category
Article
ISSN
0006-3525

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✦ Synopsis

Laboratory-made samples of the polysaccharide xylinan, also called acetan, were studied in aqueous solution at various ionic strengths I (0.01 mol/L I I 5 0.30 mol/L). The conditions for clarification (ultracentrijugation/membranejiltration) were studied. The Zimm procedure was used to obtain the average molar mass, the second virial coeficient, and the radius of gyration. The interpretation of the angular dependence of scattered light by fitting with "Master Curves" led to double-stranded wormlike chains with persistence lengths between 90 and 120 nm. The ionic strength had a strong efect on the thermodynamic second virial coeficient, but the overall structure remained unchanged. The ambiguity of the light scattering data was discussed assuming alternatively a two-component system instead of the wormlike chain model for the experimental scattering curves. The two-component system can be ruled out on the basis of model calculations.

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