Chemistry:Welan gum
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| Identifiers | |
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| EC Number |
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| Properties | |
| Appearance | white to cream colored powder |
| Density | 26.25 lbs/ft³ (bulk) |
| Hazards | |
| Safety data sheet | [1] |
| NFPA 704 (fire diamond) | |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). | |
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| Infobox references | |
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]
See also
References
- ↑ Allen, Floyd L.; Best, Glen H. & Lindroth, Thomas A., "Welan gum in cement compositions", US patent 5004506, issued 2 April 1991, assigned to Merck & Co., Inc.
- ↑ 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 01418130. PMID 24508918.
- ↑ "CP Kelco Welan Gum". CP Kelco. http://www.cpkelco.com/products-welan-gum.html. Retrieved 17 Sep 2010.
- ↑ "Welan gum". Colltec. http://www.colltec.de/Home_english/Welan_Gum/welan_gum.html. Retrieved 17 Sep 2010.
- ↑ "Welan gum". Fritz Industries. http://www.welangum.com/. Retrieved 17 Sep 2010.
External links
- Dea, Ian C M (1989). "Industrial polysaccharides". Pure and Applied Chemistry 61 (7): 1315–1322. doi:10.1351/pac198961071315. http://media.iupac.org/publications/pac/1989/pdf/6107x1315.pdf.
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