Sodium Ascorbate

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Sodium Ascorbate SODIUM ASCORBATE Prepared at the 17th JECFA (1973), published in FNP 4 (1978) and in FNP 52 (1992). Metals and arsenic specifications revised at the 61st JECFA (2003). A group ADI ‘not specified’ was established for ascorbic acid and its Ca, K and Na salts at the 25th JECFA (1981). SYNONYMS INS No. 301 DEFINITION Chemical names Sodium ascorbate, sodium L-ascorbate, 2,3-didehydro-L-threo-hexono-1,4- lactone sodium enolate; 3-keto-L-gulofurano-lactone sodium enolate C.A.S. number 134-03-2 Chemical formula C6H7O6Na Structural formula Formula weight 198.11 Assay White or almost white, odourless crystalline powder which darkens on exposure to light DESCRIPTION Not less than 99% after drying FUNCTIONAL USES Antioxidant CHARACTERISTICS IDENTIFICATION Solubility (Vol. 4) Freely soluble in water; very slightly soluble in ethanol See description under TESTS Test for ascorbate Passes test Vol. 4) Test for sodium (Vol. 4) Passes test Test a solution of previously ignited sample, acidified with dilute acetic acid TS, filtered if necessary Reducing reaction A solution of the sample will decolourize a solution of 2,6-dichloro- phenolindophenol TS PURITY Loss on drying (Vol. 4) Not more than 0.25% (vacuum desiccator over sulfuric acid, 24 h) pH (Vol. 4) 6.5 - 8.0 (1 in 10 soln) Specific rotation (Vol. 4) [alpha] 25,D: Between +103o and +108o (10% (w/v) aqueous solution) Lead (Vol. 4) Not more than 2 mg/kg Determine using an atomic absorption technique appropriate to the specified level. The selection of sample size and method of sample preparation may be based on the principles of the method described in Volume 4, “Instrumental Methods.” METHOD OF Dissolve about 0.400 g of the dried sample in a mixture of 100 ml of carbon ASSAY dioxide-free water and 25 ml of dilute sulphuric acid TS. Titrate the solution at once with 0.1 N iodine, adding a few drops of starch TS as indicator as the end-point is approached. Each ml of 0.1 N iodine is equivalent to 9.905 mg of C6H7O6Na. .
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