Journal
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
Volume 27, Issue 1, Pages 77-87Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/S0141-8130(99)00119-1
Keywords
polysaccharide; thermal stability; acetyl substituents; conformation; conformational transition; gelation
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This paper describes an original mechanism of evolution of a polysaccharide system occurring during thermal treatments. Under its native conformation, the YAS34 polymer presents a solution character in the dilute and semi-dilute regimes. However, the zero shear rate viscosity indicates existence of interchain interactions which disappear on the deacetylated polymer. Thermal treatments over the temperature of conformational change produce a progressive and irreversible evolution of the physical properties when the polymer is under its sodium salt form. This evolution was related to a modification of the arrangement of acetyl substituents. The heated polysaccharide gives thermoreversible gel which is very elastic. A gelation mechanism is proposed based on formation of helical segments connecting the network. (C) 2000 Elsevier Science B.V. AU rights reserved.
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