Tartrazine

IUPAC Name

:   Trisodium (4E)-5-oxo-1-(4-sulfonatophenyl)-4-[(4-sulfonatophenyl)hydrazono]-3-pyrazolecarboxylate

Cas Number

:   12225-21-7

HS Code

:   3204.19.82

Formula

:  

C16H9N4Na3O9S2

Basic Information

Appearance Name

:   Yellow Powder

Common Names

:   Yellow Azo Dye, Tartrazine

Packaging

:   1 kg/bag, 5 kg/carton

Category
Coloring Agents
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Technical Document

Brief Overview 

Tartrazine is a bright yellow anionic and hydrophilic powder used as a food coloring. It is a synthetic lemon yellow and yellow azo dye. It can also be used with Brilliant Blue FCF (FD&C Blue 1, E133) or Green S (E142) to produce various green shades. It is famously known by its E number E102.

Manufacturing Process

Tartrazine is manufactured by reacting diazotized 4-aminobenzenesulfonic acid (sulfanilic acid, SA) with 5-oxo-1-(4-sulfophenyl)-2-pyrazoline-3-carboxylic acid (Pyrazolone T, PyT). It can also be obtained by reacting with another compound, such as methyl ester, ethyl ester, or a salt of this carboxylic acid. The resulting compound is purified and isolated as the sodium salt. 

Another method for manufacturing tartrazine is condensing phenylhydrazine-p-sulfonic acid with dioxosuccinic acid or oxalacetic acid derivatives.

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