Azorubine

"E122" redirects here. For the chemical element, see unbibium.

Azorubine
Names
IUPAC name
disodium 4-hydroxy-2-[(E)-(4-sulfonato-1-naphthyl)diazenyl]naphthalene-1-sulfonate
Other names
  • carmoisine
  • Food Red 3
  • Azorubin S
  • Brillantcarmoisin O
  • Acid Red 14
  • C.I. 14720
Identifiers
3D model (JSmol)
ChEMBL
ChemSpider
ECHA InfoCard 100.020.598 Edit this at Wikidata
EC Number
  • 217-699-5
E number E122 (colours)
KEGG
UNII
  • InChI=1S/C20H14N2O7S2.2Na/c23-20-15-8-4-3-7-14(15)19(31(27,28)29)11-17(20)22-21-16-9-10-18(30(24,25)26)13-6-2-1-5-12(13)16;;/h1-11,23H,(H,24,25,26)(H,27,28,29);;/q;2*+1/p-2/b22-21+;; ☒N
    Key: YSVBPNGJESBVRM-ZPZFBZIMSA-L ☒N
  • InChI=1/C20H14N2O7S2.2Na/c23-20-15-8-4-3-7-14(15)19(31(27,28)29)11-17(20)22-21-16-9-10-18(30(24,25)26)13-6-2-1-5-12(13)16;;/h1-11,23H,(H,24,25,26)(H,27,28,29);;/q;2*+1/p-2/b22-21+;;
    Key: YSVBPNGJESBVRM-DGPRXMBVBS
  • c1ccc2c(c1)c(ccc2S(=O)(=O)[O-])/N=N/c3cc(c4ccccc4c3O)S(=O)(=O)[O-].[Na+].[Na+]
Properties
C20H12N2Na2O7S2
Molar mass 502.44
Appearance red powder
Melting point >300 °C (572 °F)
Soluble (120g/L)
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Azorubine is an azo dye consisting of two naphthalene subunits.[1] It is a red solid. It is mainly used in foods that are heat-treated after fermentation. It has E number E122.[2]

  1. ^ Klaus Hunger; Peter Mischke; Wolfgang Rieper; et al. (2005). "Azo Dyes". Ullmann's Encyclopedia of Industrial Chemistry. Weinheim: Wiley-VCH. doi:10.1002/14356007.a03_245. ISBN 978-3527306732.
  2. ^ Pubchem entry