Tartrazine

Tartrazine is a synthetic lemon yellow azo dye primarily used as a food coloring. 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.

"Yellow 5" redirects here. For other uses, see Yellow No. 5.
Tartrazine
Names
IUPAC name
Trisodium 5-hydroxy-1-(4-sulfonatophenyl)-4-[(E)-(4-sulfonatophenyl)diazenyl]-1H-pyrazole-3-carboxylate
Other names
FD&C Yellow 5
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.016.091
E number E102 (colours)
UNII
  • InChI=1S/C16H12N4O9S2.3Na/c21-15-13(18-17-9-1-5-11(6-2-9)30(24,25)26)14(16(22)23)19-20(15)10-3-7-12(8-4-10)31(27,28)29;;;/h1-8,21H,(H,22,23)(H,24,25,26)(H,27,28,29);;;/q;3*+1/p-3/b18-17+;;; Y
    Key: YXHBBEQKMVAJOH-GLCFPVLVSA-K Y
  • InChI=1/C16H12N4O9S2.3Na/c21-15-13(18-17-9-1-5-11(6-2-9)30(24,25)26)14(16(22)23)19-20(15)10-3-7-12(8-4-10)31(27,28)29;;;/h1-8,21H,(H,22,23)(H,24,25,26)(H,27,28,29);;;/q;3*+1/p-3/b18-17+;;;
    Key: YXHBBEQKMVAJOH-KAGMCZNHBW
  • [Na+].[Na+].[Na+].[O-]S(=O)(=O)c1ccc(cc1)/N=N/c3c(nn(c2ccc(cc2)S([O-])(=O)=O)c3O)C([O-])=O
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)
2
1
0
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Y verify (what is YN ?)
Infobox references

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.

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