A cellulose-like conformation accessible to the xanthan backbone and implications for xanthan synergism

Molecular modelling has been used to show that branching at the 3-position of every second glucose unit in the backbone of the xanthan molecule does not preclude the backbone from adopting a two-fold cellulose-like conformation. A stereochemically acceptable model of this type is defined with a pitc...

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Bibliographic Details
Published in:Carbohydrate polymers 1990, Vol.13 (1), p.57-68
Main Authors: Millane, R.P., Wang, Bowei
Format: Article
Language:English
Subjects:
Applied sciences
Exact sciences and technology
Natural polymers
Physicochemistry of polymers
Starch and polysaccharides
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Summary:Molecular modelling has been used to show that branching at the 3-position of every second glucose unit in the backbone of the xanthan molecule does not preclude the backbone from adopting a two-fold cellulose-like conformation. A stereochemically acceptable model of this type is defined with a pitch of 10·51 Å (slightly longer than that of cellulose). This is a model structure for the conformation of xanthan in cooperative interactions with galactomannans, that has been proposed as the molecular basis for the synergistic (gelling) properties of these two polysaccharides in solution.
ISSN:0144-8617
1879-1344
DOI:10.1016/0144-8617(90)90051-S