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Prepared at the 28th JECFA (1984), published in FNP 31/1 (1984) and in FNP 52 (1992) |
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SYNONYMS |
CI Food Yellow 3, FD&C Yellow No. 6, Crelborange S, CI (1975) No. 15985, INS No. 110 |
DEFINITION |
Consists essentially of disodium 6-hydroxy-5-(4-sulfonatophenylazo)-2-naphthalene-6-sulfonate and subsidiary colouring matters together with sodium chloride and/or sodium sulfate as the principal uncoloured components.
May be converted to the corresponding aluminium lake in which case only the General Specifications for Aluminium Lakes of Colouring Matters apply. |
Chemical names |
Disodium 6-hydroxy-5-(4-sulfonatophenylazo)-2-naphthalene-sulfonate |
C.A.S. number |
2783-94-0 |
Chemical formula |
C16H10N2Na2O7S2 |
Structural formula |  |
Formula weight |
452.38 |
Assay |
Not less than 85% total colouring matters |
DESCRIPTION |
Orange-red powder or granules |
FUNCTIONAL USES |
Colour |
CHARACTERISTICS | |
IDENTIFICATION | |
Solubility |
Soluble in water; sparingly soluble in ethanol |
Identification of colouring matters |
Passes test |
PURITY | |
Loss on drying at 135o together with chloride and sulfate calculated as sodium salts |
Not more than 15% |
Water insoluble matter |
Not more than 0.2% |
Arsenic |
Not more than 3 mg/kg |
Lead |
Not more than 10 mg/kg |
Heavy metals |
Not more than 40 mg/kg Test 0.5 g of the sample as directed in the Limit Test |
Subsidiary colouring matters |
Not more than 5% Not more than 2% shall be colours other than trisodium 2-hydroxy-1-(4-sulfonatophenylazo)naphthalene-3,6-disulfonate Use the following conditions: Developing solvent: No. 4 Height of ascent of solvent front: approximately 17 cm |
Organic componds other than colouring matters |
Not more than 0.5%, sum of 4-amino-1-benzenesulfonic acid, 3-hydroxy-2,7-naphthalenedisulfonic acid, 6-hydroxy-2-naphthalenesulfonic acid, 7-hydroxy-1,3-naphthalenedisulfonic acid, 4,4'-diazoaminodibenzenesulfonic acid, 6,6'-oxydi-2-naphthalenesulfonic acid Use HPLC under the following conditions: HPLC elution gradient: 2 to 100% at 4% per min (linear) followed by elution at 100%. |
Unsulfonated primary aromatic amines |
Not more than 0.01% calculated as aniline |
Ether extractable matter |
Not more than 0.2% |
METHOD OF ASSAY |
Proceed as directed under Total Content by Titration with Titanous Chloride, using the following: Weight of sample: 0.5-0.6 g Buffer: 10 g sodium citrate Weight (D) of colouring matters equivalent to 1.00 ml of 0.1 N TiCl3: 11.31 mg |