Properties: Occurs in spheroidal tears up to 32 mm in diameter. Also flakes and powder. Solns of gum from Acacia verek are levorotatory; other acacia species are dextrorotatory: Hamy, Bull. Sci. Pharmacol.
35, 421 (1928). Specific gravity: 1.35-1.49 (samples dried at 100° are heavier). Moisture content usually varies from 13-15%. U.S.P. limit 15%. Material containing less than 12% chips easily and produces dust during transportation. Insol in alcohol. Almost completely sol in twice its weight of water. 100 grams of a satd soln contains 37 g at 25°; 38 g at 50°; 40 g at 90°: Taft, Malm, Trans. Kans. Acad. Sci.
32, 49 (1929). Aq soln acid to litmus. Also sol in glycerol and in propylene glycol, but prolonged heating (several days) may be necessary for complete solution (about 5%). Incompat. Precipitates or jellies result upon addition of solns of ferric salts, borax, basic lead acetate (lead subacetate, but not neutral lead acetate), alcohol, sodium silicate, gelatin, ammoniated tincture of guaiac.
Use: As mucilage, excipient for tablets, size, emulsifier, thickener, also in candy, other foods; as colloidal stabilizer. In the manufacture of spray-dried "fixed" flavors¾stable, powdered flavors used in packaged dry-mix products (puddings, desserts, cake mixes) where flavor stability and long shelf life are important.
产品链接: 9000-01-5››