| SYNONYMS |
TARTRAZINE*C.I.FOOD YELLOW4 * FD & C YELLOW 5 * ACID YELLOW 23 |
| DEFINITION |
Tartrazine consists essentially of trisodium 5-hydroxy-1-(4-sulfonatophenyl) (4-sulfonatophenylazo)-H-pyrazole-3-carboxylate and subsidary colour matters together with sodium chloride and/or sodium sulfate as the principal uncoloured components.
Tartrazine is described as the sodium salt. The calcium and the potassium are also permitted. |
| CLASS |
Monoazo |
| COLOUR INDEX NO. |
19140 |
| EEC NUMBER |
E-102 |
| EINECS |
217-699-5 |
| CHEMICAL NAMES |
Trisodium-5-hydroxy-1-(4-sulfonatophenyl)-4-(4-sulfonatophenylazo)-H-
pyrazole-3-carboxylate |
| CHEMICAL FORMULA |
C16H9N4Na3O9S2 |
| MOLECULAR WEIGHT |
534.4 |
| ASSAY |
Content not less than 85% total colouring matters, calculated as the sodium salt.
E 1% 1cm 530 at ca 426 nm in aqueous solution. |
| DESCRIPTION |
Light orange powder |
| IDENTIFICATION |
|
a. Spectrometry
b. Yellow solution in water |
Maximum in water at ca 426 nm |
PURITY
Water Insoluble matter |
Not more than 0.2% |
| Subsidiary colouring matters |
Not more than 1.0% |
| Organic compounds other than colouring matters |
[4-hydrazinobenzene sulfonic acid / 4-aminobenzene-1-sulfonic acid / 5-oxo-1-(4-sulfophenyl)-2-pyrazoline-3-carboxylic acid / 4,4'- diazoaminodi(benzene sulfonic acid) / Tetrahydroxysuccinic acid] - Total not more than 0.5%
|
| Unsulfonated primary aromatic amines |
Not more than 0.01% (Calculated as aniline) |
| Ether extractable matter |
Not more than 0.2% under neutral conditions |
| Arsenic |
Not more than 3 mg/kg. |
| Lead |
Not more than 10 mg/kg. |
| Mercury |
Not more than 1 mg/kg. |
| Cadmium |
Not more than 1 mg/kg. |
| Heavy metals (as Pb) |
Not more than 40 mg/kg. |
