| |
| ERYTHROSINE |
SYNONYMS
|
ERYTHROSINE* C. I. FOOD RED 14 * FD & C RED 3 * ACID RED 51 |
| DEFINITION |
Erythrosine consists essentially of disodium 2-(2,4,5,7-tetraiodo-3-oxidooxoxanthen-9-y1) benzoate monohydrate and subsidary colouring matter together
with water,sodium chloride and/or sodium sulfate as the principal uncoloured components. Erythrosine is
described as the sodium salt. The calcium and the potassium salt are also permitted. |
CLASS
|
xanthene |
| COLOUR INDEX NO. |
45430 |
| EEC NUMBER |
E-127 |
| EINECS |
240-474-8 |
| CHEMICAL NAMES |
Disodium 2-(2,4,5,7-tetraiodo-3-oxido-6-oxoxanthen-9-y1) benzoate monohydrate
|
| CHEMICAL FORMULA |
C20H6I4Na2O5H2O |
| MOLECULAR WEIGHT |
897.88 |
ASSAY
|
Content not less than 85% total colouring matters, calculated as the anhydrous sodium salt; E 1% 1cm 1 100 at ca 526 nm in aqueous solution at pH7 |
| DESCRIPTION |
Red powder |
IDENTIFICATION
a. Spectrometry
b. Red solution in water |
Maximum in water at ca 526 nm at pH7. |
PURITY
Inorganic iodides calculated as sodium iodide |
Not more than 0.1% |
| Water Insoluble matter |
Not more than 0.2% |
Subsidiary colouring matters
(exceptfluorescein) |
Not more than 4.0% |
| Organic compounds other than colouring matters |
[Tri-iodoresorcinol] - Not more than 0.2%
[2-(2,4-dihydroxy-3,5-diodobenzoic acid] - Not more than 0.2% |
| Fluorescein |
Not more than 20 mg/kg. |
| Ether extractable matter |
From a solution of pH from 7 through 8, 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. |
| |
