Determination of thermodynamic properties of sodium alginate from bacteria and seaweeds in aqueous solutions

  • A. Straatmann
  • W. Borchard
Conference paper
Part of the Progress in Colloid and Polymer Science book series (PROGCOLLOID, volume 119)


Alginates are biopolymers produced by seaweeds as well as by some bacteria like Pseudomonas aeruginosa or Azotobacter vinelandii. They consist of copolymers containing 1,4-β-d-mannuronate and its 5-epimer α-l-guluronate. Their composition and physical properties depend on the source of the alginate. Different alginates from seaweeds and bacteria have been investigated using analytical ultracentrifugation. The samples were prepared in sodium chloride solution to suppress charge effects of the polymers. From the concentration gradient in equilibrium centrifugation the molar masses and the second virial coefficient are derived. The results obtained by this method are in good agreement with the results of light scattering measurements. The properties of different alginates are compared and discussed.

Key words

Bacterial alginate Sedimentation-diffusion equilibrium Aggregation 


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Copyright information

© Springer-Verlag 2002

Authors and Affiliations

  • A. Straatmann
    • 1
  • W. Borchard
    • 1
  1. 1.Institut für Physikalische und Theoretische Chemie der Gerhard-MercatorUniversität DuisburgDuisburgGermany

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