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'''Welan gum''' is an ] used as a ] modifier in industrial applications such as cement manufacturing.<ref>{{cite patent |country=US|number=5004506|status=patent| title = Welan gum in cement compositions | gdate =2 April 1991 | inventor = Allen, Floyd L. |inventor2=Best, Glen H. |inventor3=Lindroth, Thomas A. | assign1 = Merck & Co., Inc.}}</ref> It is produced by ] of sugar by bacteria of the genus '']''. The molecule consists of repeating tetrasaccharide units with single branches of ] or ].<ref name="KaurBera2014">{{cite journal|last1=Kaur|first1=Varinder|last2=Bera|first2=Manav B.|last3=Panesar|first3=Parmjit S.|last4=Kumar|first4=Harish|last5=Kennedy|first5=J.F.|title=Welan gum: Microbial production, characterization, and applications|journal=International Journal of Biological Macromolecules|volume=65|year=2014|pages=454–461|issn=01418130|doi=10.1016/j.ijbiomac.2014.01.061|pmid=24508918}}</ref> 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.<ref>{{Cite web|url=http://www.cpkelco.com/products-welan-gum.html |title=CP Kelco Welan Gum '''Welan gum''' is an ] used as a ] modifier in industrial applications such as cement manufacturing.<ref>{{cite patent |country=US|number=5004506|status=patent| title = Welan gum in cement compositions | gdate =2 April 1991 | inventor = Allen, Floyd L. |inventor2=Best, Glen H. |inventor3=Lindroth, Thomas A. | assign1 = Merck & Co., Inc.}}</ref> It is produced by ] of sugar by bacteria of the genus '']''. The molecule consists of repeating tetrasaccharide units with single branches of ] or ].<ref name="KaurBera2014">{{cite journal|last1=Kaur|first1=Varinder|last2=Bera|first2=Manav B.|last3=Panesar|first3=Parmjit S.|last4=Kumar|first4=Harish|last5=Kennedy|first5=J.F.|title=Welan gum: Microbial production, characterization, and applications|journal=International Journal of Biological Macromolecules|volume=65|year=2014|pages=454–461|issn=0141-8130|doi=10.1016/j.ijbiomac.2014.01.061|pmid=24508918}}</ref> 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.<ref>{{Cite web|url=http://www.cpkelco.com/products-welan-gum.html |title=CP Kelco Welan Gum
| publisher=CP Kelco |accessdate=17 Sep 2010 }}</ref><ref>{{Cite web|url=http://www.colltec.de/Home_english/Welan_Gum/welan_gum.html |title=Welan gum |publisher=Colltec |accessdate=17 Sep 2010}}</ref><ref>{{Cite web|url=http://www.welangum.com/ |title=Welan gum |publisher=Fritz Industries |accessdate= 17 Sep 2010}}</ref> | publisher=CP Kelco |accessdate=17 Sep 2010 }}</ref><ref>{{Cite web|url=http://www.colltec.de/Home_english/Welan_Gum/welan_gum.html |title=Welan gum |publisher=Colltec |accessdate=17 Sep 2010}}</ref><ref>{{Cite web|url=http://www.welangum.com/ |title=Welan gum |publisher=Fritz Industries |accessdate= 17 Sep 2010}}</ref>


Latest revision as of 11:35, 5 March 2024

Welan gum
Identifiers
CAS Number
ECHA InfoCard 100.118.859 Edit this at Wikidata
EC Number
  • 619-250-2
Properties
Appearance white to cream colored powder
Density 26.25 lbs/ft³ (bulk)
Hazards
NFPA 704 (fire diamond)
NFPA 704 four-colored diamondHealth 1: Exposure would cause irritation but only minor residual injury. E.g. turpentineFlammability 1: Must be pre-heated before ignition can occur. Flash point over 93 °C (200 °F). E.g. canola oilInstability 0: Normally stable, even under fire exposure conditions, and is not reactive with water. E.g. liquid nitrogenSpecial hazards (white): no code
1 1 0
Safety data sheet (SDS)
Except where otherwise noted, data are given for materials in their standard state (at 25 °C , 100 kPa). checkY verify (what is  ?) Infobox references
Chemical compound

Welan gum is an exopolysaccharide used as a rheology modifier in industrial applications such as cement manufacturing. 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. 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.

See also

References

  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. 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. "CP Kelco Welan Gum". CP Kelco. Retrieved 17 Sep 2010.
  4. "Welan gum". Colltec. Retrieved 17 Sep 2010.
  5. "Welan gum". Fritz Industries. Retrieved 17 Sep 2010.

External links


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