Erythrosine, also referred to as Red No. 3, is an organoiodine compound and a derivative of fluorone. This pink dye is commonly used in food coloring. Chemically, it is the disodium salt of 2,4,5,7-tetraiodofluorescein. It has a maximum absorbance at 530 nm in aqueous solutions and is prone to photodegradation.
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IUPAC Name:
2-(6-Hydroxy-2,4,5,7-tetraiodo-3-oxo-xanthen-9-yl)benzoic acid
Identifiers:
- CAS Number: 16423-68-0
- ChEMBL: ChEMBL1332616
- ChemSpider: 3144
- ECHA InfoCard: 100.036.390
- E Number: E127 (Colors)
- PubChem CID: 3259
- UNII: 8TL7LH93FM
- CompTox Dashboard (EPA): DTXSID7044843
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Properties:
- Chemical Formula: C20H6I4Na2O5
- Molar Mass: 879.86 g/mol
- Melting Point: 142–144 °C (288–291 °F; 415–417 K)
- Hazards: NFPA 704 (Fire Diamond)
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