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 |
(CAS#: 9005-35-0)
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CAS: 9005-35-0
Definition: Calcium alginate is the ammonium salt of alginic acid.
Chemical Formula: (C 6 H 11 NO 6 ) n
Structural formula:
Structural formula from Phillips, Wedlock and Williams: Gums and Stabilizers for the Food Industry 5 (1990) by permission of Oxford University Press.
The number and sequence of the Mannuronate and Glucuronate residues shown above vary in the naturally occurring alginate. The associated water molecules are not shown.
Assay: Not less than 18.0% and not more than 21.0% of carbon dioxide (CO 2 ), equivalent to not less than 89.6% and not more than 104.5% of calcium alginate (C 6 H 7 Ca 1/2 O 6 ) n on the anhydrous basis.
Description: Occurs as white to yellowish brown filamentous, grainy, granular and powdered forms
Use function: Stabilizer, thickener, gelling agent, emulsifier
Solubility: Insoluble in water and ether; slightly soluble in ethanol; slowly soluble in solutions of sodium polyphosphate, sodium carbonate, and substances that combine with calcium ions.
Specification:
PURITY |
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Loss on drying |
Not more than 15% (105กใ, 4h) |
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Arsenic |
Not more than 3 mg/kg (Method II) |
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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 |
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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:
TESTS |
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IDENTIFICATION TESTS |
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Precipitate formation with calcium chloride |
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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 calcium alginate from gum arabic, sodium carboxymethyl cellulose, carrageenan, gelatin, gum ghatti, karaya gum, carob bean gum, methyl cellulose and tragacanth gum. |
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Precipitate formation with ammonium sulphate |
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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 calcium alginate from agar, sodium carboxymethyl cellulose, carrageenan, de-esterified pectin, gelatin, carob bean gum, methyl cellulose and starch. |
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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. |
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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 27.38 mg of calcium alginate (equivalent weight 219). |