Alginate / alginic acid

English name：Alginic acid from brown algae；Mixed polymer of mannuronic and guluronic acid

Other names: alginic acid;  Prionic acid

CAS No.: 9005-32-7

Molecular formula: (c6h8o6) n

Grade: br

Content (carboxyl group) (calculated on dry basis):19 - 25% (titrimetric analysis)

Infrared spectroscopy: match with the reference substance

Drying loss: <15% (2 g, 105 ° C, 4 hours)

Starch: not blue

Heavy metals: ≤ 0.004%

Arsenic salt: ≤ 0.0003%

Physicochemical properties: white to light yellowish brown, odorless, tasteless powder. A colloidal substance made from seaweed β- Anhydrous D-mannuronic acid polymer. Soluble in alkaline solution, slightly soluble in hot water, very slightly soluble in cold water and organic solvents. Soluble in alkali metal hydroxide. The pH value of 3% aqueous solution is 1.3 ~ 5.5, which can absorb water 200 ~ 300 times its weight. It can be decomposed slowly and its molecular weight becomes smaller when placed under warm conditions. As pharmaceutical excipients, it is used as adhesive, disintegrating agent, thickener and suspending agent of tablets. Melting point: 300 ° C.

Purpose: biochemical research. Emulsifier. Protective colloid

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