Welan gum is an exopolysaccharide used as a rheology modifier in industrial applications such as cement manufacturing.
[1] It is produced by fermentation of sugar by bacteria of the genus Alcaligenes.
The molecule consists of repeating tetrasaccharide units with single branches of L-mannose or L-rhamnose.
[2] In solution, the gum retains viscosity at elevated temperature, and is stable in a wide pH range, in the presence of calcium ion, and with high concentration of glycols.
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