TATRAZINE |
| 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. |