Physicochemical and chemical characterisation of chitosan in dilute aqueous solution

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2002
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Berth, Gisela
Dautzenberg, Herbert
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BORCHARD, W., ed., A. STRAATMANN, ed.. Analytical Ultracentrifugation VI. Berlin, Heidelberg: Springer Berlin Heidelberg, 2002, pp. 50-57. Progress in Colloid and Polymer Science. 119. ISBN 978-3-540-42489-5. Available under: doi: 10.1007/3-540-44672-9_8
Zusammenfassung

Static and dynamic light scattering as well as analytical ultracentrifugation and viscosity measurements were used to investigate the chain conformation of chitosans in salt-containing solutions (pH 4.5; ionic strength about 0.12 M). The samples of various degrees of acetylation were chemically homogeneous. The molecular-weight dependence of the radius of gyration has given clear evidence for a relatively flexible wormlike chain with a persistence length of about 6 nm irrespective of the degree of acetylation, where excluded-volume effects and the polydispersity of the samples were taken into account. In contrast, the interpretation of the hydrodynamic data via a “whole-body approach” according to the Wales-van Holde ratio suggested a strongly elongated chain conformation. The failure of the latter to properly reflect the chain conformation was ascribed to the high extent of draining. A nearly free-draining case can also account for the high scaling exponent of the relationship between intrinsic viscosity and molecular mass.

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540 Chemie
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Symposium on Analytical Ultracentrifugation, 1. März 2001 - 2. März 2001, Duisburg
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ISO 690BERTH, Gisela, Helmut CÖLFEN, Herbert DAUTZENBERG, 2002. Physicochemical and chemical characterisation of chitosan in dilute aqueous solution. Symposium on Analytical Ultracentrifugation. Duisburg, 1. März 2001 - 2. März 2001. In: BORCHARD, W., ed., A. STRAATMANN, ed.. Analytical Ultracentrifugation VI. Berlin, Heidelberg: Springer Berlin Heidelberg, 2002, pp. 50-57. Progress in Colloid and Polymer Science. 119. ISBN 978-3-540-42489-5. Available under: doi: 10.1007/3-540-44672-9_8
BibTex
@inproceedings{Berth2002Physi-40691,
  year={2002},
  doi={10.1007/3-540-44672-9_8},
  title={Physicochemical and chemical characterisation of chitosan in dilute aqueous solution},
  number={119},
  isbn={978-3-540-42489-5},
  publisher={Springer Berlin Heidelberg},
  address={Berlin, Heidelberg},
  series={Progress in Colloid and Polymer Science},
  booktitle={Analytical Ultracentrifugation VI},
  pages={50--57},
  editor={Borchard, W. and Straatmann, A.},
  author={Berth, Gisela and Cölfen, Helmut and Dautzenberg, Herbert}
}
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