Gum Tragacanth Iranian Exports. The tragacanth gum exudate varies in quality from long, thin white ribbon to a coarse, yellow-tan ribbon. Powder made from ribbon is white to light yellow in color, odorless, and has an insipid, mucilaginous taste. The flakes vary from yellow tan to brown to give yellowish white to tan powders.
Gum Tragacanth Iranian Exports:
Both ribbon and flake gums are available in a variety of particle sizes and viscosities depending on the end uses.Fruit nectars, consisting of pure fruit puree, artificial fruit juices, sugar, ascorbic acid, and citric acid and about 0.2 – 0.8% of total weight. It has replaced Tragacanth in many pickle and relish sauces where rapid cooling is used.Tragacanth improves the shelf life and reduces syneresis when sued as a cold process stabilizer for meringues. In combination with gum Arabic, Tragacanth produces a superior bakery flavor emulsion.
Tragacanth in Citrus Beverages:
Tragacanth in citrus beverages, Tragacanth acts as a thickening agent to impart proper mouth feel and stability Since the gum has good acid resistance, it has been used in candy cream centers containing natural fruit and acid. It has also been used as a binder in the cold-press process and the extrusion process for making candy cigarettes, and lozenges. Tragacanth swells rapidly in either cold or hot water to a viscous colloidal sol or semi-gel, which acts as a protective colloid and stabilizer. While it is insoluble in alcohol and other organic solvents the gum can tolerate small amounts of alcohol of glycols. Tragacanth solutions are acidic in the pH range of 5–6. It is fairly stable over a wide pH range down to extremely acidic conditions of about pH 2.
Tragacanth is compatible with other plant hydrocolloids as well as carbohydrates, most proteins, and fats. Viscosity is most stable at pH 4 to 8 with very good stability at higher pH as well as down to pH 2. The addition of strong mineral and organic acids cause some drop in viscosity.
However, it is one of the most resistant gums and is chosen for use under highly acidic conditions. Divalent and trivalent cations can cause a viscosity drop. Tragacanth is similar to other plant hydrocolloids that are subject to bacterial attack.
Glycerol or propylene glycol, at 94 ml/liter, serves as excellent preservatives in many emulsions. Benzoic acid or sodium benzoate at less than 0.1% concentration is effective when used below pH 6. A combination 0.17% methyl and 0.03% propyl parahydroxybenzoates is effective at pH 3 – 9.