An indigoid dye and a redox indicator
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Indigo Carmine

Item No. 31525

Product Insert (PDF)Safety Data Sheet (SDS) (PDF)
Technical Information
Formal Name
2-(1,3-dihydro-3-oxo-5-sulfo-2H-indol-2-ylidene)-2,3-dihydro-3-oxo-1H-indole-5-sulfonic acid, disodium salt
CAS Number
860-22-0
Synonyms
  • Acid Blue 74
  • FD and C Blue 2
  • C.I. 73015
  • C.I. 75781
  • indigo disulfonate
  • Indigotine
Molecular Formula
C16H8N2O8S2 • 2Na
Formula Weight
466.4
Purity
≥70%
Formulation (Request formulation change)
A crystalline solid
Solubility(Learn about Variance in Solubility)
DMF: slightly solubleDMSO: 1 mg/mlPBS (pH 7.2): 10 mg/ml
λmax
252, 287, 600 nm
SMILES
O=C1C2=CC(S([O-])(=O)=O)=CC=C2N/C1=C3NC4=CC=C(S([O-])(=O)=O)C=C4C\3=O.[Na+].[Na+]
InChi Code
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-;;
InChi Key
KHLVKKOJDHCJMG-HLBFIJABSA-L
Shipping & Storage Information
Storage
-20°C
Shipping
Room temperature in continental US; may vary elsewhere
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    25 g

    $36

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    50 g

    $68

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    100 g

    $108

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    500 g

    $502

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    Product Description

    Indigo carmine is an indigoid dye and a redox indicator.1,2 Upon reduction, indigo carmine shifts from blue to yellow with absorbance maxima of 610 and 407 nm, respectively.2 Formulations containing indigo carmine have been used as color additives in food and pharmaceutical preparations.

    WARNING This product is not for human or veterinary use.

    References & Product Citations
    Product Description References

    1. Claus, H., Faber, G., and König, H. Redox-mediated decolorization of synthetic dyes by fungal laccases. Appl. Microbiol. Biotechnol. 59(6), 672-678 (2002).

    2. Tratnyek, P.G., Reilkoff, T.E., Lemon, A.W., et al. Visualizing redox chemistry: Probing environmental oxidation-reduction reactions with indicator dyes. Chem. Educator 6(3), 172-179 (2001).