STRUCTURE AND PROPERTIES OF GUAR GUM. guar gum a natural hydrophilic hydrocolloid belongs to the galactomannan family of polysaccharides consisting of mannose backbone and galactose side branching. chemically it consist of D-Mannopyranosyl backbone (B-1- 4 glycosidic linkage) along with D-glucopyranosyl side branching (a-1- 6 glycosidic linkage)