Difference between revisions of "Karaya gum"
Jump to navigation
Jump to search
(username removed) |
|||
| (3 intermediate revisions by 3 users not shown) | |||
| Line 1: | Line 1: | ||
== Description == | == Description == | ||
| − | A dried gummy exudate from ''Sterculia urens'' trees native to central and northern India. Karaya gum occurs as tears of variable size and of a somewhat crystalline appearance. The tears are a translucent, pale yellow, with a slightly acetic odor and a mucilaginous, slightly acetic taste. Karaya is a partially acetylated polysaccharide with about 8% acetic groups and 37% uronic acid residues that contains [ | + | A dried gummy exudate from ''Sterculia urens'' trees native to central and northern India. Karaya gum occurs as tears of variable size and of a somewhat crystalline appearance. The tears are a translucent, pale yellow, with a slightly acetic odor and a mucilaginous, slightly acetic taste. Karaya is a partially acetylated polysaccharide with about 8% acetic groups and 37% uronic acid residues that contains [[rhamnose]], [[galactose]], and galacturonic acid. It is acidic to [[litmus]]. Karaya gum is insoluble in alcohol, but swells in water to form a [[gel]]. Gum karaya, which has only been available commercially since 1920, forms an extremely strong adhesive with small amounts of water. It is used as a medical adhesive, dye thickener, textile coating, emulsifier, and paper fiber binder. |
== Synonyms and Related Terms == | == Synonyms and Related Terms == | ||
| − | + | gomme de karaya (Fr.); goma karaya (Esp.); kadaya gum; Indian tragacanth; Indian gum; bassora gum; kuteera gum; sterculia gum; gum hog; gum karaya; katilo; kulo; mucara | |
| − | == | + | ==Physical and Chemical Properties== |
Swells in cold water. Insoluble in ethanol. | Swells in cold water. Insoluble in ethanol. | ||
| Line 17: | Line 17: | ||
|} | |} | ||
| − | == | + | ==Resources and Citations== |
| − | * | + | * Richard S. Lewis, ''Hawley's Condensed Chemical Dictionary'', Van Nostrand Reinhold, New York, 10th ed., 1993 |
| − | * | + | * Matt Roberts, Don Etherington, ''Bookbinding and the Conservation of Books: a Dictionary of Descriptive Terminology'', U.S. Government Printing Office, Washington DC, 1982 |
* ''Van Nostrand's Scientific Encyclopedia'', Douglas M. Considine (ed.), Van Nostrand Reinhold, New York, 1976 | * ''Van Nostrand's Scientific Encyclopedia'', Douglas M. Considine (ed.), Van Nostrand Reinhold, New York, 1976 | ||
| − | * | + | * John S. Mills, Raymond White, ''The Organic Chemistry of Museum Objects'', Butterworth Heineman, London, 2nd ed., 1994 |
* ''The Merck Index'', Martha Windholz (ed.), Merck Research Labs, Rahway NJ, 10th edition, 1983 Comment: entry 5296 | * ''The Merck Index'', Martha Windholz (ed.), Merck Research Labs, Rahway NJ, 10th edition, 1983 Comment: entry 5296 | ||
| − | * ''Encyclopedia Britannica'', http://www.britannica.com Comment: "Gum." | + | * ''Encyclopedia Britannica'', http://www.britannica.com Comment: "Gum." Accessed 2 Sept. 2004. |
| − | * Art and Architecture Thesaurus Online, | + | * Art and Architecture Thesaurus Online, https://www.getty.edu/research/tools/vocabulary/aat/, J. Paul Getty Trust, Los Angeles, 2000 |
[[Category:Materials database]] | [[Category:Materials database]] | ||
Latest revision as of 13:06, 21 September 2022
Description
A dried gummy exudate from Sterculia urens trees native to central and northern India. Karaya gum occurs as tears of variable size and of a somewhat crystalline appearance. The tears are a translucent, pale yellow, with a slightly acetic odor and a mucilaginous, slightly acetic taste. Karaya is a partially acetylated polysaccharide with about 8% acetic groups and 37% uronic acid residues that contains Rhamnose, Galactose, and galacturonic acid. It is acidic to Litmus. Karaya gum is insoluble in alcohol, but swells in water to form a Gel. Gum karaya, which has only been available commercially since 1920, forms an extremely strong adhesive with small amounts of water. It is used as a medical adhesive, dye thickener, textile coating, emulsifier, and paper fiber binder.
Synonyms and Related Terms
gomme de karaya (Fr.); goma karaya (Esp.); kadaya gum; Indian tragacanth; Indian gum; bassora gum; kuteera gum; sterculia gum; gum hog; gum karaya; katilo; kulo; mucara
Physical and Chemical Properties
Swells in cold water. Insoluble in ethanol.
| CAS | 9000-36-6 |
|---|
Resources and Citations
- Richard S. Lewis, Hawley's Condensed Chemical Dictionary, Van Nostrand Reinhold, New York, 10th ed., 1993
- Matt Roberts, Don Etherington, Bookbinding and the Conservation of Books: a Dictionary of Descriptive Terminology, U.S. Government Printing Office, Washington DC, 1982
- Van Nostrand's Scientific Encyclopedia, Douglas M. Considine (ed.), Van Nostrand Reinhold, New York, 1976
- John S. Mills, Raymond White, The Organic Chemistry of Museum Objects, Butterworth Heineman, London, 2nd ed., 1994
- The Merck Index, Martha Windholz (ed.), Merck Research Labs, Rahway NJ, 10th edition, 1983 Comment: entry 5296
- Encyclopedia Britannica, http://www.britannica.com Comment: "Gum." Accessed 2 Sept. 2004.
- Art and Architecture Thesaurus Online, https://www.getty.edu/research/tools/vocabulary/aat/, J. Paul Getty Trust, Los Angeles, 2000