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| ALLURA RED |
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| SYNONYMS |
ALLURA RED * C. I. FOOD RED 17 |
| DEFINITION |
Allura Red consists essentially of disodium 2-hydroxy-1-(2-methoxy-5-methyl-4-sulfonato-phenylazo) nephthalene-6-sulfonate and subsidiary colouring matters together with sodium chloride and/or sodium sulfate as the principal uncoloured components.
Allura Red is described as the sodium salt. The calcium and the potassium salt are also permitted. |
| CLASS |
Monoazo |
| COLOUR INDEX NO. |
16035 |
| EEC NUMBER |
E-129 |
| EINECS |
247-368-0 |
| CHEMICAL NAMES |
Disodium 2-hydroxy-1-(2-methoxy-5-methyl-4-sulfonato-phenylazo) nephthalene-6-sulfonate |
CHEMICAL FORMULA
|
C18H14N2Na2O8S2
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| MOLECULAR WEIGHT |
496.42 |
| ASSAY |
Content not less than 85% total colouring matters, calculated as the sodium salt; E 1% 1cm 540 at ca 504 nm in aqueous solution at pH7 |
| DESCRIPTION |
Dark red powder |
| IDENTIFICATION |
|
a. Spectrometry
b. Red solution in water |
Maximum in water at ca 504 nm |
PURITY
Water Insoluble matter |
Not more than 0.2% |
| Subsidiary colouring matters |
Not more than 3.0% |
| Organic compounds other than colouring matters |
[6-hydroxy-2-naphthalene sulfonic acid, sodium salt] - Not more than 0.3%
[4-amino-5-methoxy-2-methylbenezene sulfonic acid] - Not more than 0.2%
[6,6-oxybis (2-naphthalene sulfonic acid) disodium salt] - Not more than 0.1% |
| Unsulfonated primary aromatic amines |
Not more than 0.01% (Calculated as aniline) |
| Ether extractable matter |
From a solution of pH7, not more than 0.2% |
| 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. |
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