Sodium Alginate, Storage : Cool & Dry Place

Synonyms: algin, alginic acid sodium salt
cas number: 9005-38-3, molecular weight: -, chemical formula: (c6h7o6na)n, einecs ec number: ----, fema: 2015,
sodium alginate bp grade
ph eur
action and use: excipient.
Definition
sodium alginate consists mainly of the sodium salt of alginic acid, which is a mixture of polyuronic acids [c6h8o6)n] composed of residues of d-mannuronic acid and l-guluronic acid. Sodium alginate is obtained mainly from algae belonging to the phaeophyceae.
Characters
appearance: white or pale yellowish-brown powder.
Solubility: slowly soluble in water forming a viscous, colloidal solution, practically insoluble in ethanol (96 per cent).
Identification
a. Dissolve 0.2 g with shaking in 20 ml of water. To 5 ml of this solution add 1 ml of calcium chloride solution. A voluminous gelatinous mass is formed.
B. To 10 ml of the solution prepared in identification test a add 1 ml of dilute sulphuric acid. A gelatinous mass is formed.
Tests
solution s: dissolve 0.10 g in water, with constant stirring, dilute to 30 ml with the same solvent and allow to stand for 1 h.
Appearance of solution: the solution is not more opalescent than reference and not more intensely coloured than intensity 6 of the range of reference solutions of the most appropriate colour.
Dilute 1 ml of solution s to 10 ml with water r.
Chlorides: maximum 1.0 per cent.
Calcium: maximum 1.50 per cent.
Heavy metals: maximum 20 ppm.
Loss on drying: maximum 15.0 per cent, d