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FD&C Red No. 40

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FD&C Red No. 40 is a widely used ingredient in cosmetics, personal care, and skincare formulations. Depending on its function, it may serve as a moisturizer, preservative, emulsifier, or active ingredient to enhance the overall effectiveness and performance of a product.

FD&C Red No. 40 (Wikipedia)
"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.

Allura Red AC
Names
Preferred IUPAC name
Disodium 6-hydroxy-5-[(2-methoxy-5-methyl-4-sulfonatophenyl)diazenyl]naphthalene-2-sulfonate
Other names
  • Disodium 6-hydroxy-5-[(2-methoxy-5-methyl-4-sulfophenyl)azo]-2-naphthalenesulfonate
  • Allura Red
  • Food Red 17
  • C.I. 16035
  • FD&C Red 40
  • E129
  • 2-Naphthalenesulfonic acid, 6-hydroxy-5-((2-methoxy-5-methyl-4-sulfophenyl)azo)-, disodium salt
Identifiers
3D model (JSmol)
ChEMBL
ChemSpider
ECHA InfoCard 100.043.047 Edit this at Wikidata
E number E129 (colours)
UNII
  • 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+;; checkY
    Key: CEZCCHQBSQPRMU-LLIZZRELSA-L checkY
  • InChI=1/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+;;
    Key: CEZCCHQBSQPRMU-JGGVBICHBN
  • [Na+].[Na+].COc3cc(c(C)cc3/N=N/c1c2ccc(cc2ccc1O)S([O-])(=O)=O)S([O-])(=O)=O
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)
NFPA 704 four-colored diamondHealth 1: Exposure would cause irritation but only minor residual injury. E.g. turpentineFlammability 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
1
1
0
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.

Allura Red AC is manufactured by azo coupling between diazotized 5-amino-4-methoxy-2-toluenesulfonic acid and 6-hydroxy-2-naphthalene sulfonic acid.

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