Allura Red AC
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"E129" redirects here. For the train, see E129 series.
Allura Red AC, also known as FD&C Red 40 or E129, is a red azo dye commonly used in food. It was developed in 1971 by the Allied Chemical Corporation, who gave the substance its name.[1][2]
Quick Facts Names, Identifiers ...
Names | |
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Preferred IUPAC name
Disodium 7-hydroxy-5-[(2-methoxy-5-methyl-4-sulfonatophenyl)diazenyl]naphthalene-2-sulfonate | |
Other names
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Identifiers | |
3D model (JSmol) |
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ChEMBL | |
ChemSpider |
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ECHA InfoCard | 100.043.047 |
E number | E129 (colours) |
PubChem CID |
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UNII | |
CompTox Dashboard (EPA) |
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Properties | |
C18H14N2Na2O8S2 | |
Molar mass | 496.42 g·mol−1 |
Appearance | Red powder |
Melting point | > 300 °C (572 °F; 573 K) |
Hazards | |
NFPA 704 (fire diamond) | |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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It is usually supplied as its red sodium salt, but can also be used as the calcium and potassium salts. These salts are soluble in water. In solution, its maximum absorbance lies at about 504 nm.[3]: 921
Allura Red AC is manufactured by coupling diazotized 5-amino-4-methoxy-2-toluenesulfonic acid with 6-hydroxy-2-naphthalene sulfonic acid in an azo coupling reaction.[4]