Difference between revisions of "Guar gum"

Latest revision as of 08:45, 23 August 2022

Description

Gum guar is obtained from the seed of the guar plant Cyamopsis tetragonoloba grown commercially in India and the United States. Guar is a yellowish-white powder which is dispersible in hot or cold water. The water-soluble portion (approx. 85% by wt.) is called guaran and consists of polysaccharides of mannose (63%) and galactose (35%) and about 5-7% wt. of protein. While guar gum has been locally used for centuries in India and Pakistan, it has only been marketed commercially in the past 30 years. It has eight times the thickening power of Starch. Aqueous solutions of guar have a neutral pH and may be turn into a gel by the addition of small amounts of Borax. Guar gum is used as dye solution thickeners in textile printing, for texture and stabilization in food products and as a strengthener in paper.

Synonyms and Related Terms

Cyamopsis tetragonoloba; goma guar (Esp.); guar flour; gum guar; gum cyamopsis; guaran; cyamopsis gum; Burtonite V-7; Jaguar; Guarem; Indalca AG

Risks

Nontoxic.
Fisher Scientific: MSDS

Physical and Chemical Properties

Soluble in water (pH of 1.0% solution = 5.5-6.2).
Insoluble in oils, greases, hydrocarbons, ketones, esters.
CAS = 9000-30-0

Resources and Citations

Richard S. Lewis, Hawley's Condensed Chemical Dictionary, Van Nostrand Reinhold, New York, 10th ed., 1993

The Merck Index, Martha Windholz (ed.), Merck Research Labs, Rahway NJ, 10th edition, 1983 Comment: entry 4602

The Dictionary of Paper, American Paper Institute, New York, Fourth Edition, 1980

John S. Mills, Raymond White, The Organic Chemistry of Museum Objects, Butterworth Heineman, London, 2nd ed., 1994

I.W. Cottrell, J.K. Baird, gums chapter

@@ Line 1: / Line 1: @@
 == Description ==
-Gum guar is obtained from the seed of the guar plant ''Cyamopsis tetragonoloba'' grown commercially in India and the United States. Guar is a yellowish-white powder which is dispersible in hot or cold water. The water-soluble portion (approx. 85% by wt.) is called guaran and consists of polysaccharides of mannose (63%) and galactose (35%) and about 5-7% wt. of protein. While guar gum has been locally used for centuries in India and Pakistan, it has only been marketed commercially in the past 30 years. It has eight times the thickening power of [http://cameo.mfa.org/materials/fullrecord.asp?name=starch starch]. Aqueous solutions of guar have a neutral pH and may be turn into a gel by the addition of small amounts of [http://cameo.mfa.org/materials/fullrecord.asp?name=borax borax]. Guar gum is used as dye solution thickeners in textile printing, for texture and stabilization in food products and as a strengthener in paper.
+Gum guar is obtained from the seed of the guar plant ''Cyamopsis tetragonoloba'' grown commercially in India and the United States. Guar is a yellowish-white powder which is dispersible in hot or cold water. The water-soluble portion (approx. 85% by wt.) is called guaran and consists of polysaccharides of mannose (63%) and galactose (35%) and about 5-7% wt. of protein. While guar gum has been locally used for centuries in India and Pakistan, it has only been marketed commercially in the past 30 years. It has eight times the thickening power of [[starch]]. Aqueous solutions of guar have a neutral pH and may be turn into a gel by the addition of small amounts of [[borax]]. Guar gum is used as dye solution thickeners in textile printing, for texture and stabilization in food products and as a strengthener in paper.
 == Synonyms and Related Terms ==
@@ Line 7: / Line 7: @@
 ''Cyamopsis tetragonoloba''; goma guar (Esp.); guar flour; gum guar; gum cyamopsis; guaran; cyamopsis gum; Burtonite V-7; Jaguar; Guarem; Indalca AG
-== Other Properties ==
+== Risks ==
-Soluble in water  (pH of 1.0% solution = 5.5-6.2).
+* Nontoxic.
+* Fisher Scientific: [https://fscimage.fishersci.com/msds/89758.htm MSDS]
-Insoluble in oils, greases, hydrocarbons, ketones, esters.
+== Physical and Chemical Properties ==
-{| class="wikitable"
+* Soluble in water  (pH of 1.0% solution = 5.5-6.2).
-|-
+* Insoluble in oils, greases, hydrocarbons, ketones, esters.
-! scope="row"| CAS
+* CAS = 9000-30-0
-| 9000-30-0
-|}
-== Hazards and Safety ==
+==Resources and Citations==
-Nontoxic.
+* Richard S. Lewis, ''Hawley's Condensed Chemical Dictionary'', Van Nostrand Reinhold, New York, 10th ed., 1993
-Fisher Scientific: [https://fscimage.fishersci.com/msds/89758.htm MSDS]
-== Authority ==
-* Richard S. Lewis, Richard S. Lewis, ''Hawley's Condensed Chemical Dictionary'', Van Nostrand Reinhold, New York, 10th ed., 1993
 * ''The Merck Index'', Martha Windholz (ed.), Merck Research Labs, Rahway NJ, 10th edition, 1983  Comment: entry 4602
@@ Line 33: / Line 26: @@
 * ''The Dictionary of Paper'', American Paper Institute, New York, Fourth Edition, 1980
-* John S. Mills, Raymond White, John S. Mills, Raymond White, ''The Organic Chemistry of Museum Objects'', Butterworth Heineman, London, 2nd ed., 1994
+* John S. Mills, Raymond White, ''The Organic Chemistry of Museum Objects'', Butterworth Heineman, London, 2nd ed., 1994
-* I.W. Cottrell, J.K. Baird, I.W. Cottrell, J.K. Baird, gums chapter
+* I.W. Cottrell, J.K. Baird, gums chapter
 [[Category:Materials database]]