Welan_gum

Welan gum

Welan gum

Chemical compound

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.[3][4][5]

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See also

References

  1. [1]
    US patent 5004506, Allen, Floyd L.; Best, Glen H. & Lindroth, Thomas A., "Welan gum in cement compositions", issued 2 April 1991, assigned to Merck & Co., Inc.
  2. [2]
    Kaur, Varinder; Bera, Manav B.; Panesar, Parmjit S.; Kumar, Harish; Kennedy, J.F. (2014). "Welan gum: Microbial production, characterization, and applications". International Journal of Biological Macromolecules. 65: 454–461. doi:10.1016/j.ijbiomac.2014.01.061. ISSN 0141-8130. PMID 24508918.
  3. [3]
    "CP Kelco Welan Gum". CP Kelco. Retrieved 17 Sep 2010.
  4. [4]
    "Welan gum". Colltec. Retrieved 17 Sep 2010.
  5. [5]
    "Welan gum". Fritz Industries. Retrieved 17 Sep 2010.


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