Tartrazine
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"Yellow 5" redirects here. For other uses, see Yellow No. 5.
Tartrazine is a synthetic lemon yellow azo dye primarily used as a food coloring.[1][2][3][4] It is also known as E number E102, C.I. 19140, FD&C Yellow 5, Yellow 5 Lake, Acid Yellow 23, Food Yellow 4, and trisodium 1-(4-sulfonatophenyl)-4-(4-sulfonatophenylazo)-5-pyrazolone-3-carboxylate.[5]
Quick Facts Names, Identifiers ...
Names | |
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IUPAC name
Trisodium 5-hydroxy-1-(4-sulfonatophenyl)-4-[(E)-(4-sulfonatophenyl)diazenyl]-1H-pyrazole-3-carboxylate | |
Other names
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Identifiers | |
3D model (JSmol) |
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ChemSpider |
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ECHA InfoCard | 100.016.091 |
E number | E102 (colours) |
PubChem CID |
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UNII | |
CompTox Dashboard (EPA) |
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Properties | |
C16H9N4Na3O9S2 | |
Molar mass | 534.36 g·mol−1 |
20 g/100 mL | |
Solubility | 18 g/100 mL in glycerol, negligible in ethanol |
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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Tartrazine is a commonly used color all over the world, mainly for yellow, and can also be used with brilliant blue FCF (FD&C Blue 1, E133) or green S (E142) to produce various green shades. It serves as a dye for wool and silks, a colorant in food, drugs and cosmetics and an adsorption-elution indicator for chloride estimations in biochemistry.