Abstract
The gum exudates from four Asiatic Astragalus species, grown for the purpose of assessment in the USA, have been characterized chemically. The present analytical data extend those available previously for eight species, and confirm earlier indications that the gums from different Astragalus species vary widely in their chemical composition, physico-chemical parameters, solubility and amino acid composition. All species have high hydroxyproline and proline contents; some have high histidine and serine contents. In comparison with the lower viscosity exudates, the higher viscosity gums have high galacturonate, xylose, fucose and methoxyl contents and low arabinose and nitrogen contents. The data suggest that California and Arizona are suitable locations for gum tragacanth production.
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