Aluminum Caprate
Aluminum Palmitate
P-Aminobenzoic acid
Bebzakdegtde
Benzyl Acetoacetate
Benzyl Benzoate
Benzyl Butyrate
Benzyl Cinnamate
Benzyl Formate
Calcium Ascorbate
Calcium Bromate
Calcium Caprate
Calcium Caprylate
Calcium Carbonate
Calcium Citrate
Calcium Diglutamate
Calcium Gluconate
Calcium Lactate
Calcium Myristate
Calcium Palmitate
Calcium Pantothenate
D-Camphor
Carboxymethyl cellulose
Cellulose Acetate
Chlorophyll
Citronellal
DL-Citronellol
Citronellyl Acetates
Citronellyl Butyrate
Diethyl Malate
Diethyl Tartrate
Disodium Citriate
Erythorbic Acid
Ethyl Acetate
Neryl Acetate
Neryl Butyrate
Neryl Formate
Ethyl Vanillin
Ethtyl Vanillin Isobutyrate
Ethyl Vanillin Beta-D-Glucopyranoside
Ethyl Vanillin Propyleneglycol Acetal
Ferric Citrate
Ferrous Ascorbate
Ferrous Citrate
Ferrous Fumarate
Ferrous Lactate
Ferrous Gluconate
Geranyl Formate
Lactalbumin
Lanolin
Lauric Acid
Lauryl Acetate
Lauryl Alcohol
Linalyl Acetate
Linalyl Anthranilate
Linalyl Formate
Magnesium Caprate
Magnesium Caprylate
Magnesium Fumarate
Manganese Citrate
Musk, Ketone
Myristic Acid
Sodium Ascorbate
Sodium Benzoate
Sodium Bicarbonate
Sodium Formate
Sodium Fumarate
Sodium Humate
Sodium Lactate
Sodium Tartrate
Tocopherols
Sorbitol
Salicylic Acid
Potassium Sorbate
Potassium Chloride
Potassium Caseinate
Potassium Carbonate
Potassium Caprylate
Potassium Caprate
Beta-Carotene
Potassium Bromate
Potassium Borate
Potassium Bisulfite

 

Ammonium Alginate

(CAS#: 9005-34-9)

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CAS: 9005-34-9

Definition: Ammonium alginate is the ammonium salt of alginic acid.

Chemical Formula: (C 6 H 11 NO 6 ) n

Structural formula:

Use function: Stabilizer, thickener, gelling agent, emulsifier

Solubility: Dissolves slowly in water forming a viscous solution; insoluble in ethanol, and ether

Specification:

Purity


Loss on drying

Not more than 15% (105กใ, 4h)

Water-insoluble matter

Not more than 2% on the dried basis
See description under TESTS.

Sulfated ash

Not more than 7% on the dried basis

Arsenic

Not more than 3 mg/kg (Method II)

Lead

Not more than 5 mg/kg
Prepare a sample solution as directed for organic compounds in the Limit Test, using 5 m g of lead ion (Pb) in the control

Microbiological criteria

Total plate count: Not more than 5,000 colonies per gram.

Initially prepare a 10 -1 dilution by adding a 50 g sample to 450 ml of Butterfield's phosphate buffered dilution water and homogenizing in a high speed blender.

Yeasts and moulds: Not more than 500 colonies per gram

Coliforms: Negative by test

Salmonella: Negative by test

Test Method:

Precipitate formation with calcium chloride

 


To a 0.5% solution of the sample in sodium hydroxide TS add one-fifth of its volume of a 2.5% solution of calcium chloride. A voluminous, gelatinous precipitate is formed. This test distinguishes ammonium alginate from gum arabic, sodium carboxymethyl cellulose, carrageenan, gelatin, gum ghatti, karaya gum, carob bean gum, methyl cellulose and tragacanth gum.

 

Precipitate formation with ammonium sulphate

 


To a 0.5% solution of the sample in sodium hydroxide TS add one-half of its volume of a saturated solution of ammonium sulfate. No precipitate is formed. This test distinguishes ammonium alginate from agar, sodium carboxymethyl cellulose, carrageenan, de-esterified pectin, gelatin, carob bean gum, methyl cellulose and starch.

 

Test for alginate

Dissolve as completely as possible 0.01 g of the sample by shaking with 0.15 ml of 0.1 N sodium hydroxide and add 1 ml of acid ferric sulfate TS. Within 5 min, a cherry-red colour develops that finally becomes deep purple.

PURITY TESTS


 

Water-insoluble matter

Disperse 2 g of the sample, weighed to the nearest 0.1 mg, in 800 ml of water in a 2,000-ml flask. Neutralize to pH 7 with sodium hydroxide TS and then add 3 ml in excess. Add 40 ml of hydrogen peroxide solution containing 30% by weight H 2 O 2 , cover the flask and boil for 1 h with frequent stirring. Filter while hot through a tared Gooch crucible provided with a glass fibre filter (2.4 cm, No. 934 AH, Reeve Angel & Co., Clifton, N.Y., or equivalent filter). If slow filtration is caused by high viscosity of the sample solution, boil until the viscosity is reduced enough to permit filtration. Wash the crucible thoroughly with hot water, dry the crucible and its contents at 105o for 1 h, cool and weigh. Calculate as percentage of the dry weight.

Test method of assay:

Proceed as directed under Carbon Dioxide Determination by Decarboxylation in the General Methods. Each ml of 0.25 N sodium hydroxide consumed is equivalent to 5.5 mg of carbon dioxide (CO 2 ) or 27.12 mg of ammonium alginate (equivalent weight 217).