SYNONYMS
|
QUINOLINE YELLOW-WS * C. I. FOOD YELLOW 13 |
| DEFINITION |
Quinoline Yellow-WS is prepared by sulfonating 2-(2-quinolyl) indan-1,3-dione. Quinoline Yellow consists essentially of sodium salt of a mixture of disulfonates (principally), monosulfonates and trisulfonates of the above compound and subsidiary colouring matters together with sodium chloride and/or sodium sulfate as the principal uncoloured components.
Quinoline Yellow-WS is described as the sodium salt. The calcium and the potassium salt are also permitted. |
| CLASS |
Quinophthalone |
| COLOUR INDEX NO. |
47005 |
| EEC NUMBER |
E-104 |
| EINECS |
305-897-5 |
| CHEMICAL NAMES |
The disodium salt of the disulfonates of 2-(2-Quinolyl) indan-1,3-dione (principal component) |
| CHEMICAL FORMULA |
C18H9N Na2O8S2 (principal component) |
| |
|
| MOLECULAR WEIGHT |
477.38 (principal component) |
| ASSAY |
Content not less than 70% total colouring matters, calculated as the sodium salt; E 1% 1cm 865 (principal component) at ca 411 nm in aqueous acetic acid solution. |
| DESCRIPTION |
Yellow powder |
IDENTIFICATION
a. Spectrometry
b. Yellow solution in water |
Maximum in aqueous acitic acid solution of pH5 at ca 411 nm |
PURITY
Water Insoluble matter |
Not more than 0.2% |
| Subsidiary colouring matters |
Not more than 4.0% |
| Organic compounds other than colouring matters |
[2-methylquinoline / 2-methylquinoline-sulfonic acid / Phthalic acid / 2,6-dimethyl quinoline / 2,6-dimethyl quinoline sulfonic acid ] - Total not more than 0.5% |
| 2-(2-Quinoly) indan-1,3-dione |
Not more than 4 mg/ kg |
| 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. |
| |
