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Guar gum: A Potential Natural Hydrophilic Polymer


Table 1. Uses of guar gum

Use

Concentration (%)

Emulsion stabilizer

1

Tablet binder

Up to 10

Thickener for lotions and cream

Up to 2.5

Table 2. Pharmacopeial specifications for gaur gum

Test

USP

Appearance (powder)

White to yellowish-white

Viscosity (1% w/v dispersion)

4860 cps

Density

1.492 g/cm3

Molecular weight

≈ 220 000

pH (1 % w/v solution)

5.5-7.5

Loss on drying

≤ 15.0 %

Acid-insoluble matter

≤ 7.0 %

Arsenic

≤ 3 ppm

Lead

≤ 0.001 %

Heavy metals

≤ 0.002 %

Protein

≤ 10.0 %

Table 3. Compositions of guar gum (Cyamopsis tetragonoloba seeds)

Compositon

Concentration (%)

Soluble fiber

75

Insoluble fiber

7.6

Crude protein

2.16

Total lipid

0.78

Moisture

9.75

Ash

0.5

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