Allura Red AC

Title: Allura Red AC
CAS Registry Number: 25956-17-6
CAS Name: 6-Hydroxy-5-[(2-methoxy-5-methyl-4-sulfophenyl)azo]-2-naphthalenesulfonic acid disodium salt
Additional Names: 6-hydroxy-5-[(6-methoxy-4-sulfo-m-tolyl)azo]-2-naphthalenesulfonic acid disodium salt; 1-[(6-methoxy-4-sulfo-m-tolyl)azo]-2-naphthol-6-sulfonic acid disodium salt; FD & C Red No. 40; C.I. 16035; C.I. Food Red 17
Molecular Formula: C18H14N2Na2O8S2
Molecular Weight: 496.42
Percent Composition: C 43.55%, H 2.84%, N 5.64%, Na 9.26%, O 25.78%, S 12.92%
Literature References: Prepn: GB 1164249 C.A. 72, 68195j (1970) corresp to Rast, Steiner, US 3519617 (1969, 1970, both to Allied Chem.).
Properties: Dark red powder. Soly at 25°: water, 22.5%; 50% alcohol, 1.3%.
Use: Color additive in foods, drugs and cosmetics.
Allyl acetate Allyl Alcohol Allyl Bromide Allyl Chloride Allyl Cyanide

Allura Red AC
Allura Red AC Formula V.1.svg
Allura Red AC ball-and-stick.png
CAS number 25956-17-6 YesY
PubChem 6093299
ChemSpider 11588224 YesY
Jmol-3D images Image 1
Molecular formula C18H14N2Na2O8S2
Molar mass 496.42 g mol−1
Appearance red powder
Melting point >300°C
NFPA 704
NFPA 704.svg
 N (verify) (what is: YesY/N?)
Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
Infobox references

Allura Red AC is a red azo dye that goes by several names including: Allura Red, Food Red 17, C.I. 16035, FD&C Red 40, E129,[1][2] 2-naphthalenesulfonic acid, 6-hydroxy-5-((2-methoxy-5-methyl-4-sulfophenyl)azo)-, disodium salt, and disodium 6-hydroxy-5-((2-methoxy-5-methyl-4-sulfophenyl)azo)-2-naphthalenesulfonate. It is used as a food dye and has the E number E129. Allura Red AC was originally introduced in the United States as a replacement for the use of amaranth as a food coloring.[citation needed]

It has the appearance of a dark red powder. It usually comes as a sodium salt, but can also be used as both calcium and potassium salts. It is soluble in water; in solution, its maximum absorbance lies at about 504 nm.[3]p.921 Its melting point is above 300 degrees Celsius.

Allura Red AC is one of many High Production Volume Chemicals.

Red AC was originally manufactured from coal tar, but is now mostly made from petroleum. Despite the popular misconception, Allura Red AC is not derived from any insect, unlike the food colouring carmine, which is derived from the female cochineal insect.

Related dyes include Sunset Yellow FCF, Scarlet GN, tartrazine, and Orange B.