Prepared at the 53rd JECFA (1999) and published in FNP 52 Add 7 (1999), superseding tentative specifications prepared at the 51st JECFA (1998), published in FNP 52 Add 6 (1998). Group ADI "Not specified" for glucono-delta-lactone and gluconates, established at the 51st JECFA in 1998. | |
SYNONYMS |
INS No. 580 |
DEFINITION |
The material of commerce exists as anhydrous, dihydrate or a mixture of both |
Chemical names |
Magnesium di-D-gluconate |
C.A.S. number |
Anhydrous: 3632-91-5 |
Chemical formula |
C12H22MgO14 |
Structural formula |
|
Formula weight |
Anhydrous: 414.60 |
Assay |
Not less than 98.0% and not more than 102.0% on the anhydrous basis |
DESCRIPTION |
White to off white, odourless, fine powder |
FUNCTIONAL USES |
Acidity regulator, firming agent, yeast nutrient, nutrient supplement |
CHARACTERISTICS |
|
IDENTIFICATION |
|
Solubility (FNP 5) |
Soluble in water; sparingly soluble in ethanol |
Test for magnesium (FNP 5) |
Passes test |
Test for gluconate (FNP 5) |
Passes test |
PURITY |
|
Water (FNP 5) |
Between 3.0% and 12.0% (Karl Fischer Method) |
Reducing substances (FNP 5) |
Not more than 1.0% calculated as D-glucose (Method I) |
Lead (FNP 5) |
Not more than 2 mg/kg |
METHOD OF ASSAY |
Dissolve about 0.6 g of the sample, accurately weighed, in 50 ml of water, add 10 ml of ammonia/ammonium chloride buffer solution and 5 drops of eriochrome black TS. Titrate with 0.05 M disodium ethylenediaminetetraacetate to a deep blue colour. Calculate % magnesium gluconate, dihydrate (as is basis) from:
45.07 = equivalence factor for magnesium gluconate, dihydrate |