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Comparison between the physicochemical behaviour of two microbial polysaccharides: RMDP17 and rhamsan

Authors
Journal
International Journal of Biological Macromolecules
0141-8130
Publisher
Elsevier
Publication Date
Volume
26
Issue
1
Identifiers
DOI: 10.1016/s0141-8130(99)00062-8
Keywords
  • Rhamsan
  • Polysaccharides
  • Rmdp17
Disciplines
  • Chemistry

Abstract

Abstract This paper concerns the properties of two ionic polysaccharides with very close chemical structures. pH metric and conductimetric measurements showed that they behave similarly from a polyelectrolytic point of view. From optical rotation and differential scanning calorimetry (DSC) measurements, the two polymers probably adopt a double helical conformation which is destabilised by deacetylation. The main differences concern the stability of this ordered conformation and the ability of these double helices to associate to form gels. The results support a higher thermal stability of the ordered conformation for deacetylated RMDP17 (about 8°C), whereas deacetylated rhamsan has a better ability to form gels.

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