Back قرمز النيلة Arabic ایندیقو کرمین AZB Indigo karmin BS Indigokarmín Czech Indigokarmin German Carmín de índigo Spanish Indigo-karmin Basque ایندیگو کرمین Persian Indigokarmiini Finnish Carmin d'indigo French

Indigo carmine

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 Edit this at Wikidata
E number E132 (colours)
KEGG
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+;; checkY
    Key: KHLVKKOJDHCJMG-QDBORUFSSA-L checkY
  • 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
  • [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:
GHS07: Exclamation mark[1]
Warning
H302[1]
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
Pharmacology
V04CH02 (WHO)
Legal status
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 ?)
Indigotindisulfonate sodium
Clinical data
Trade namesBludigo
License data
Identifiers
E numberE132 (colours) Edit this at Wikidata
CompTox Dashboard (EPA)
ECHA InfoCard100.011.572 Edit this at Wikidata

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.[3][4] 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.

  1. ^ a b "Indigo carmine". Sigma Aldrich. Retrieved 15 Feb 2022.
  2. ^ "Bludigo- indigotindisulfonate sodium injection". DailyMed. 7 November 2022. Retrieved 21 January 2023.
  3. ^ Summary of Color Additives for Use in United States in Foods, Drugs, Cosmetics, and Medical Devices, Food and Drug Administration
  4. ^ Current EU approved additives and their E Numbers, Food Standards Agency, 26 November 2010

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