Prepared at the 53rd JECFA (1999) and published in FNP 52 Add 7 (1999), superseding specifications prepared at the 21st JECFA (1977), published in NMRS 57 (1977) and in FNP 52 (1992). ADI 0-30 mg/kg bw, established at the 21st JECFA in 1977. | |
SYNONYMS |
INS No. 334 |
DEFINITION |
|
Chemical names |
L-Tartaric acid, L-2,3-dihydroxybutanedioic acid, L-2,3-dihydroxysuccinic acid |
C.A.S. number |
87-69-4 |
Chemical formula |
C4H6O6 |
Structural formula |
|
Formula weight |
150.09 |
Assay |
Not less than 99.5% on the dried basis |
DESCRIPTION |
Colourless or translucent crystals, or white, fine to granular, crystalline powder; odourless |
FUNCTIONAL USES |
Synergist for antioxidants, acid, sequestrant, flavouring agent (see "Table of specifications of flavouring agents") |
CHARACTERISTICS |
|
IDENTIFICATION |
|
Solubility (FNP 5) |
Very soluble in water; freely soluble in ethanol |
Specific rotation (FNP 5) |
A 1 in 10 solution is dextrorotatory |
Test for tartrate (FNP 5) |
Passes test |
PURITY |
|
Loss on drying (FNP 5) |
Not more than 0.5% (over P2O5, 3 h) |
Specific rotation (FNP 5) |
[ |
Sulfated ash (FNP 5) |
Not more than 0.1% |
Sulfates (FNP 5) |
Not more than 0.05% |
Oxalate |
Nearly neutralize 10 ml of a 1 in 10 solution of the sample with ammonia TS, and add 10 ml of calcium sulfate TS. No turbidity is produced |
Lead (FNP 5) |
Not more than 2 mg/kg |
METHOD OF ASSAY |
Weigh accurately about 2 g of the dried sample, dissolve in 40 ml of water, add phenolphthalein TS, and titrate with 1 N sodium hydroxide. Each ml of 1 N sodium hydroxide is equivalent to 75.04 mg of C4H6O6. |