Guaran gum

Guaran gum Leguminous plants Food cosmetics pharmaceutical thickener and stabilizer... 

Guaran gum crosslinked with divinylsulphone yielded gels with good flow properties and chemical stability. The support was used to purify lectins... 

Pectin, algin, carrageenan, guaran gum, locust bean flour, carboxymethylcellulose, modified starches... 

Algin, pectin, propylene glycol alginate, gum arabic, xanthan gum, guaran gum, methylcellulose Gum arabic, gum ghatti, xanthan gum... 

Concentration (%) Gum arabic Tragacanth Carrageenan Sodium alginate Methyl cellulose Locust bean gum Guaran gum... 

Guaran gum consists of a chain of P-D-mannopyranosyl units joined by 1 4 linkages. Every second residue has a side chain, a D-gal-actopyranosyl residue that is bound to the main chain by an a(l 6) linkage (cf. Formula 4.126). 

Guaran gum forms highly viscous solutions (Table 4.21), the viscosity of which is shear rate dependent (Fig. 4.23). 

Guaran gum is used as a thickening agent and a stabilizer in salad dressings and ice creams (application level 0.3%). In addition to the food industry, it is v idely used in paper, cosmetic and pharmaceutical industries. 

The main locust bean polysaccharide is similar to that of guaran gum a linear chain of 1 4 linked P-D-maimopyranosyl units, with a-D-gal-actopyranosyl residues 1 6 joined as side chains. The ratio mannose/galactose is 3 to 6 this indicates that, instead of every second mannose residue, as in guaran gum, only every 4th to 5th is substituted at the C-6 position with a galactose molecule. 

Fig. 2a. Examples of caibohydiate polymers with intemnit and branch position differences (a) cellulose (b) flaxseed gum (c) guaran (d) C-6 hydroxyl ...

Like guaran, and the endosperm polysaccharides of other legumes, locust bean (carob)gum [9000-40-2] is also a galactomaiman. Like guaran, it has a linear backbone of (1 — 4)-1inked P-D-mannopyranosyl units. However, in locust bean gum, approximately one of every 3.9 P-D-mannopyranosyl units, on the average, is substituted with an a-D-galactopyranosyl unit attached at 0-6. 

Cone. Gum arabic °/ /o Tragacanth Carrageenan Sodium alginate Guaran... 

In no case is one of these galactomannans available and used as a pure polysaccharide. Rather they are the ground endosperm of the seeds of the plant from which they are obtained. As a result, the commercial gums also contain fiber, protein, ash, and other constituents. As already indicated, the polysaccharide present in guar gum is called guaran. Chemical names have not been given to the other galactomannans. 

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