Erythrosine

"Red 3" redirects here. For the techno release called Red Three, see Dave Clarke (DJ).
Erythrosine
Erythrosine
Names
IUPAC name
2-(6-Hydroxy-2,4,5,7-tetraiodo-3-oxo-xanthen-9-yl)benzoic acid
Identifiers
3D model (JSmol)
ChEMBL
ChemSpider
ECHA InfoCard 100.036.390 Edit this at Wikidata
E number E127 (colours)
UNII
  • InChI=1S/C20H8I4O5/c21-11-5-9-17(13(23)15(11)25)28-18-10(6-12(22)16(26)14(18)24)20(9)8-4-2-1-3-7(8)19(27)29-20/h1-6,25-26H checkY
    Key: OALHHIHQOFIMEF-UHFFFAOYSA-N checkY
  • InChI=1/C20H8I4O5/c21-11-5-9-17(13(23)15(11)25)28-18-10(6-12(22)16(26)14(18)24)20(9)8-4-2-1-3-7(8)19(27)29-20/h1-6,25-26H
    Key: OALHHIHQOFIMEF-UHFFFAOYAB
  • [O-]C(=O)C1=CC=CC=C1C1=C2C=C(I)C(=O)C(I)=C2OC2=C1C=C(I)C([O-])=C2I.[Na].[Na]
Properties
C20H6I4Na2O5
Molar mass 879.86 g/mol
Melting point 142 to 144 °C (288 to 291 °F; 415 to 417 K)[1]
Hazards
NFPA 704 (fire diamond)
NFPA 704 four-colored diamondHealth 2: Intense or continued but not chronic exposure could cause temporary incapacitation or possible residual injury. E.g. chloroformFlammability 1: Must be pre-heated before ignition can occur. Flash point over 93 °C (200 °F). E.g. canola oilInstability 0: Normally stable, even under fire exposure conditions, and is not reactive with water. E.g. liquid nitrogenSpecial hazards (white): no code
2
1
0
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
☒N verify (what is checkY☒N ?)

Erythrosine, also known as Red No. 3, is an organoiodine compound, specifically a derivative of fluorone. It is a pink dye which is primarily used for food coloring.[2] It is the disodium salt of 2,4,5,7-tetraiodofluorescein. Its maximum absorbance is at 530 nm[3] in an aqueous solution, and it is subject to photodegradation.

  1. ^ "Erythrosine B product description". The Chemical Book.
  2. ^ Lyday PA (2005). "Iodine and Iodine Compounds". Ullmann's Encyclopedia of Industrial Chemistry. Weinheim: Wiley-VCH.
  3. ^ Lancashire RJ. "Food Color Additives". Department of Chemistry, University of the West Indies. Archived from the original on 28 January 2007. Retrieved 29 January 2007.