Indigo carmine

Indigo carmine, or 5,5′-indigodisulfonic acid sodium salt, is an organic salt derived from indigo by aromatic sulfonation, which renders the compound soluble in water. It is approved for use as a food colorant in the United States and European Union to produce a blue color. It has the E number E132, and is named Blue No. 2 by the Federal Food, Drug, and Cosmetic Act. It is also a pH indicator.

Indigo carmine
Names
Preferred IUPAC name
Disodium [2(2′)E]-3,3′-dioxo-1,1′,3,3′-tetrahydro[2,2′-biindolylidene]-5,5′-disulfonate
Other names
  • indigotine
  • 5,5′-indigodisulfonic acid sodium salt
  • Brilliant Indigo
  • 4 G
  • C.I. Acid Blue 74
  • C.I. 73015
  • CI Food Blue 1
  • FD&C Blue 2
  • Sicovit Indigotin 85
  • E132
  • indigotindisulfonate sodium
Identifiers
3D model (JSmol)
ChEBI
ChEMBL
ChemSpider
DrugBank
ECHA InfoCard 100.011.572
E number E132 (colours)
KEGG
PubChem CID
UNII
  • InChI=1S/C16H10N2O8S2.2Na/c19-15-9-5-7(27(21,22)23)1-3-11(9)17-13(15)14-16(20)10-6-8(28(24,25)26)2-4-12(10)18-14;;/h1-6,17-18H,(H,21,22,23)(H,24,25,26);;/q;2*+1/p-2/b14-13+;; Y
    Key: KHLVKKOJDHCJMG-QDBORUFSSA-L Y
  • InChI=1/C16H10N2O8S2.2Na/c19-15-9-5-7(27(21,22)23)1-3-11(9)17-13(15)14-16(20)10-6-8(28(24,25)26)2-4-12(10)18-14;;/h1-6,17-18H,(H,21,22,23)(H,24,25,26);;/q;2*+1/p-2/b14-13+;;
    Key: KHLVKKOJDHCJMG-AKPRSONXBD
SMILES
  • [Na+].[Na+].[O-]S(=O)(=O)c3cc4C(=O)\C(=C2\C(=O)c1cc(ccc1N2)S([O-])(=O)=O)Nc4cc3
Properties
C16H8N2Na2O8S2
Molar mass 466.36 g/mol
Appearance purple solid
Melting point >300 °C (572 °F)
10 g/L (25 °C (77 °F))
Hazards
GHS labelling:
Warning
H302
NFPA 704 (fire diamond)
2
1
0
Pharmacology
V04CH02 (WHO)
Legal status
  • US: ℞-only
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
N verify (what is YN ?)
Infobox references
Indigotindisulfonate sodium
Clinical data
Trade namesBludigo
License data
Identifiers
E numberE132 (colours)
CompTox Dashboard (EPA)
ECHA InfoCard100.011.572
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