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Allura Red AC

Catalog Number DYE-AFC-0006
CAS Number 25956-17-6
Structure
Description Allura Red AC is a red azo dye commonly used in food. It is usually available as a red sodium salt, but is also available as a calcium and potassium salt. These salts are soluble in water. In solution, its maximum absorbance is about 504 nm.
Synonyms Disodium 6-hydroxy-5-[(2-methoxy-5-methyl-4-sulfophenyl)azo]-2-naphthalenesulfonate, Allura Red, Food Red 17, C.I. 16035, Red 40, E129, 2-Naphthalenesulfonic acid, 6-hydroxy-5-((2-methoxy-5-methyl-4-sulfophenyl)azo)-, disodium salt
IUPAC Name Disodium 7-hydroxy-5-[(2-methoxy-5-methyl-4-sulfonatophenyl)diazenyl]naphthalene-2-sulfonate
Molecular Weight 496.42
Molecular Formula C18H14N2Na2O8S2
Canonical SMILES [Na+].[Na+].COc3cc(c(C)cc3/N=N/c1c2ccc(cc2ccc1O)S([O-])(=O)=O)S([O-])(=O)=O
InChI 1S/C18H16N2O8S2.2Na/c1-10-7-14(16(28-2)9-17(10)30(25,26)27)19-20-18-13-5-4-12(29(22,23)24)8-11(13)3-6-15(18)21;;/h3-9,21H,1-2H3,(H,22,23,24)(H,25,26,27);;/q;2*+1/p-2/b20-19+;;
InChI Key CEZCCHQBSQPRMU-LLIZZRELSA-L
Melting Point > 300 °C (572 °F; 573 K)
Appearance Red powder
Application It is used in some tattoo inks and in many products such as marshmallows, soft drinks, cherry-flavored products, children's medicines, and dairy products.
CI Number C.I. 16035
E Number E129

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