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| AMARANTH |
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SYNONYMS
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AMARANTH * C. I. FOOD RED 9 * FD & C RED 2 * ACID RED 27 |
| DEFINITION |
Amaranth consists essentially of trisodium 2-hydroxy-1-(4-sulfonato-1-naphthylazo) naphthalene-3,6-disulfonate and subsidary colouring matters together with sodium chloride and/or sodium sulfate as the principal uncoloured components.
Amaranth is described as the sodium salt. The calcium and the potassium salt are also permitted. |
| CLASS |
Monoazo |
| COLOUR INDEX NO. |
16185 |
EEC NUMBER |
E-123 |
| EINECS |
213-022-2 |
CHEMICAL NAMES
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Trisodium 2-hydroxy-1-(4-sulfonato-1-naphthylazo) naphthalene-3,6-disulfonate |
| CHEMICAL FORMULA |
C20H11N2Na3O10S3 |
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| MOLECULAR WEIGHT |
604.48 |
| ASSAY |
Content not less than 85% total colouring matters, calculated as the sodium salt; E 1% 1cm 440 at ca 520 nm in aqueous solution. |
| DESCRIPTION |
Reddish - brown powder |
IDENTIFICATION
a. Spectrometry
b. Red solution in water |
Maximum in water at ca 520 nm |
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| PURITY |
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| Water Insoluble matter |
Not more than 0.2% |
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| Subsidiary colouring matters |
Not more than 3.0% |
| Organic compounds other than colouring matters |
[4-aminonaphthalene-1-sulfonic acid/3-hydroxynaphthalene-2,7-disulfonic acid / 6-hydroxynaphthalene-2-sulfonic acid / 7-hydroxynaphthalene-1,3-disulfonic acid / 7- hydroxynaphthalene-1,3-6-trisulfonic acid] - Total not more than 0.5% |
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| 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. |
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