Gum acacia, or Gum Arabic, is a natural substance is used in foods, pharmaceuticals, nutraceuticals, cosmetics & other industries as a thickener, emulsifier, stabilizer, binder as well as a source of dietary fiber, helping with digestion of foods, lowering cholesterol & helping in management of weight. It is also used to stop soil erosion. Acacia gum tears are obtained from the sap of acacia trees, like Senegalia senegal & Vachellia seyal etc.
Gum acacia (G-ACA) is a complex combination of glycoproteins & polysaccharides that mainly have L-arabinose, D-galactose, L-rhamnose and D-glucuronic acid distributed in the approximate molar ratio of 3:3:1:11 respectively. The molecular weight of gum acacia lies between 200,000-600,000 Daltons. Its structure has a branched backbone of 1,3-linked β-D-galactopyranosyl units, with side chains of 1,6-linked α-L-arabinofuranosyl or 4-O-methyl-α-D-glucuronic acid units connected to C-6 of the galactose residues. The glycoprotein part of gum acacia is made up of hydroxyproline, serine, alanine & glycine as the main amino acids.
G-ACA is versatile and multifunctional ingredient that enhances the quality, performance & appeal of various products.
Used as thickener, emulsifier, foam stabilizer, moisture retention agent and/or texturizing agent in manufacture of cheese, frozen dairy desserts, meat & poultry products, flour, icing, centre fillings, soft candies, chewing gums etc. as well as to bind sweeteners & flavors in soft drinks.
Gum acacia is used in the pharmaceutical industry as emulsifying agent, thickener/viscosity-increasing agent, and binder, especially in buccal or lozenge type dosage forms.
The acacia powder hydrates readily in cold water & concentrations of up to 40-50% are easy to handle and control. Unlike most other water-soluble gums of similar molecular weight, acacia gum exhibits very low viscosity in water; a 1% dispersion of Xanthan gum & a 40% solution of gum acacia have similar viscosities of about 3000-5000 cps. Hence, it is necessary to use additional gums or thickeners while formulating oral & topical pharmaceutical formulations.
It is also used in the preparation of buccal tablets (pastilles & lozenges). It is used to stabilise O/W emulsions which are used in tablet coatings.