CHEBI:31695 - indigo carmine

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ChEBI Name indigo carmine
ChEBI ID CHEBI:31695
Definition An organic sodium salt resulting from the formal condensation of indigo carmine (acid form) with two equivalents of sodium hydroxide. It is an indicator at pH 11.5-14, changing from blue to yellow.
Stars This entity has been manually annotated by the ChEBI Team.
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Formulae C16H10N2O8S2.2Na
C16H8N2Na2O8S2
Net Charge 0
Average Mass 466.356
Monoisotopic Mass 467.967
InChI 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+;;
InChIKey KHLVKKOJDHCJMG-QDBORUFSSA-L
SMILES C=1(C=CC2=C(C1)C(\C(=C\3/NC=4C=CC(=CC4C3=O)S([O-])(=O)=O)\N2)=O)S([O-])(=O)=O.[Na+].[Na+]
Roles Classification
Biological Role(s): food colouring
A food additive that imparts colour to food. In European countries, E-numbers for permitted food colours are from E 100 to E 199, divided into yellows (E 100-109), oranges (E 110-119), reds (E 120-129), blues and violets (E 130-139), greens (E 140-149), browns and blacks (E 150-159), and others (E 160-199).
Application(s): food colouring
A food additive that imparts colour to food. In European countries, E-numbers for permitted food colours are from E 100 to E 199, divided into yellows (E 100-109), oranges (E 110-119), reds (E 120-129), blues and violets (E 130-139), greens (E 140-149), browns and blacks (E 150-159), and others (E 160-199).
histological dye
A dye used in microscopic or electron microscopic examination of cells and tissues to give contrast and to highlight particular features of interest, such as nuclei and cytoplasm.
two-colour indicator
A colour indicator that possesses a different colour on each side of the transition interval.
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ChEBI Ontology
Outgoing indigo carmine (CHEBI:31695) has part indigo carmine(2−) (CHEBI:90120)
indigo carmine (CHEBI:31695) has role food colouring (CHEBI:77182)
indigo carmine (CHEBI:31695) has role histological dye (CHEBI:77178)
indigo carmine (CHEBI:31695) has role two-colour indicator (CHEBI:50412)
indigo carmine (CHEBI:31695) is a organic sodium salt (CHEBI:38700)
IUPAC Name
disodium (2E)-3-oxo-2-(3-oxo-5-sulfonato-1,3-dihydro-2H-indol-2-ylidene)-2,3-dihydro-1H-indole-5-sulfonate
Synonyms Sources
C.I. Acid Blue 74 ChemIDplus
C.I. Food Blue 1 ChemIDplus
C.I. Food Blue 1, disodium salt ChemIDplus
C.I. Natural Blue 2 ChemIDplus
Disodium 3,3'-dioxo-(delta2,2'-biindoline)-5,5'-disulfonate ChemIDplus
Disodium 5,5'-disulfoindigo ChemIDplus
Disodium 5,5'-indigotin disulfonate ChemIDplus
Disodium indigo-5,5-disulfonate ChemIDplus
E 132 ChemIDplus
FD and C Blue No. 2 ChemIDplus
FD&C Blue No. 2 ChemIDplus
Indigocarmine KEGG DRUG
Indigotin-5,5'-disulfonic acid disodium salt ChemIDplus
Indigotindisulfonate sodium KEGG DRUG
Sodium 5,5'-indigotindisulfonate ChemIDplus
Sodium indigo-5,5'-bisulfonate ChemIDplus
Sodium indigotindisulfonate ChemIDplus
Brand Names Sources
Acid blue 74 ChEBI
C.I. 73015 ChEBI
C.I. 75781 ChEBI
Indigo carmine KEGG DRUG
Natural blue 2 ChEBI
Manual Xrefs Databases
D01563 KEGG DRUG
HMDB0059912 HMDB
Indigo_carmine Wikipedia
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Registry Numbers Types Sources
860-22-0 CAS Registry Number ChemIDplus
905434 Reaxys Registry Number Reaxys
Citations Waiting for Citations Types Sources
24865501 PubMed citation Europe PMC
24922336 PubMed citation Europe PMC
25305623 PubMed citation Europe PMC
25361489 PubMed citation Europe PMC
25650249 PubMed citation Europe PMC
25849647 PubMed citation Europe PMC
25887729 PubMed citation Europe PMC
26058926 PubMed citation Europe PMC
26076807 PubMed citation Europe PMC
26216072 PubMed citation Europe PMC
26404013 PubMed citation Europe PMC
Last Modified
28 October 2015