tragacanth

(redirected from Tragacanth gum)
Also found in: Dictionary, Thesaurus, Medical.

tragacanth

(trăg`əkănth) or

gum tragacanth,

gummy exudation from the leguminous shrub Astragalus gummifer and related pulsepulse,
in botany, common name for members of the Fabaceae (Leguminosae), a large plant family, called also the pea, or legume, family. Numbering about 650 genera and 17,000 species, the family is third largest, after the asters and the orchids.
..... Click the link for more information.
 family plants of SE Europe and W Asia. It is obtained through incisions in the stem of the plant. The gum is produced chiefly in Iran. Tragacanth is almost insoluble in water but swells in it to form a stiff gel. It is used as an emulsifying agent, as a component of pills, hand lotions, and medicinal lubricating jellies, as a demulcent, and as a sizing material. A gum (sometimes called Indian tragacanth) from a plant of the sterculiasterculia
, common name for some members of the Sterculiaceae, a family of herbs, shrubs, and trees of tropical and subtropical regions. The most important members of the family are the cacao, source of cocoa and chocolate, and the cola, the caffeine-rich seeds of which are used
..... Click the link for more information.
 family is sold as a cheaper substitute. See gumgum,
term commonly applied to any of a wide variety of colloidal substances somewhat similar in appearance and general characteristics, exuded by or extracted from plants.
..... Click the link for more information.
.

tragacanth

[′traj·ə‚kanth]
(materials)
The gummy exudate produced by certain Asiatic species of Astragalus ; consists of a soluble portion containing uronic acid and arabinose, and an insoluble portion that absorbs water and swells to make a stiff opalescent mucilage.
References in periodicals archive ?
The Raman spectrum of Arabic gum shows a doublet at around 850 [cm.sup.-1] (882 [cm.sup.-1] and 841 [cm.sup.-1]), whereas tragacanth gum has a singlet (857 [cm.sup.-1]).
It has been also possible to distinguish between Arabic gum and tragacanth gum. Nevertheless, we did not observe any differentiation within drying oils or glues groups.
Neat binder Producer/manufacturer Symbol Proteinaceous binders Rabbit skin glue Zecchi RG Strong glue Zecchi SG Fish glue Zecchi FG Egg white Local market EW Egg yolk Local market EY Whole egg Local market WE Casein Zecchi C Drying oils Linseed oil Zecchi LOZ Linseed oil Maimeri LOM Linseed oil Ferrario LOF Poppy-seed oil Zecchi POZ Poppy-seed oil Talens POT Walnut oil Zecchi WOZ Walnut oil Ferrario WOF Stand-oil Zecchi SOLZ Polysaccharide media Arabic gum Zecchi AG Tragacanth gum Zecchi TG TABLE 2: Main near infrared and Raman bands, characteristic for different classes of binding media, highlighted by PCA applied on combined spectra referred to all neat binders.