E 102 TARTRAZINE

Synonyms

CI Food Yellow 4

Definition

Tartrazine is prepared from 4-amino-benzenesulphonic acid, which is diazotized using hydrochloric acid and sodium nitrite. The diazo compound is then coupled with 4,5-dihydro-5-oxo-1-(4sulphophenyl)-1H-pyrazole-3-carboxylic acid or with the methyl ester, the ethyl ester, or a salt of this carboxylic acid. The resulting dye is purified and isolated as the sodium salt. Tartrazine consists essentially of trisodium 5-hydroxy-1-(4-sulfonatophenyl)-4-(4-sulfonatophenylazo)-H-pyrazole-3-carboxylate and subsidiary colouring matters together with sodium chloride and/or sodium sulphate as the principal uncoloured components. Tartrazine is described as the sodium salt. The calcium and the potassium salt are also permitted.

Colour Index No

19140

Einecs

217-699-5

Chemical name

Trisodium-5-hydroxy-1-(4-sulfonatophenyl)-4-(4-sulfonatophenylazo)-H-pyrazole-3-carboxylate

Chemical formula

C 16 H 9 N 4 Na 3 O 9 S 2

Molecular weight

534,37

Assay

Content not less than 85 % total colouring matters calculated as the sodium salt E 1% 1cm 530 at ca. 426 nm in aqueous solution

Description

Light orange powder or granules

Appearance of the aqueous solution

Yellow

Official Journal of the European Union 22.3.2012 EN L 83/9

Identification

Spectrometry: Maximum in water at ca. 426 nm

Purity

Water insoluble matter: Not more than 0,2 %

Subsidiary colouring matters: Not more than 1,0 %

Organic compounds other than colouring matters 4-aminobenzene-1-sulfonic acid, 5-oxo-1-(4-sulfophenyl)-2-pyrazoline-3-carboxylic acid, 4,4′-diazoaminodi(benzene sulfonic acid), Tetrahydroxysuccinic acid — Total not more than 0,5 %

Unsulfonated primary aromatic amines: Not more than 0,01 % (calculated as aniline)

Ether extractable matter: Not more than 0,2 % under neutral conditions

Arsenic: Not more than 3 mg/kg

Lead: Not more than 2 mg/kg

Mercury: Not more than 1 mg/kg

Cadmium: Not more than 1 mg/kg Aluminium lakes of this colour may be used.

Official Journal of the European Union 22.3.2012 EN L 83/10

E 102 柠檬黄

别名

食用黄 4（染料索引号编号）

定义

柠檬黄以 4 - 氨基苯磺酸为原料，经盐酸、亚硝酸钠进行重氮化反应；所得重氮产物再与 4,5 - 二氢 - 5 - 氧代 - 1-(4 - 磺苯基)-1H - 吡唑 - 3 - 羧酸，或该羧酸的甲酯、乙酯、各类盐发生偶合反应。反应生成的染料经提纯后，以钠盐形式析出。 柠檬黄主要成分为 5 - 羟基 - 1-(4 - 磺酸钠苯基)-4-(4 - 磺酸钠苯基偶氮)-1H - 吡唑 - 3 - 羧酸三钠盐，同时含有副色素，氯化钠和 / 或硫酸钠是主要无色杂质。产品标准形态为钠盐，钙盐、钾盐同样允许使用。

染料索引号

19140

EINECS 编号（欧洲现有商业化学物质目录）

217-699-5

化学名称

5 - 羟基 - 1-(4 - 磺酸钠苯基)-4-(4 - 磺酸钠苯基偶氮)-1H - 吡唑 - 3 - 羧酸三钠

分子式

C₁₆H₉N₄Na₃O₉S₂

分子量

534.37

含量要求

以钠盐计，总着色物质含量不低于 85%； 水溶液中比吸光度 E¹%₁cm 为 530，最大吸收波长约 426nm

性状

浅橙色粉末或颗粒

水溶液外观

黄色 《欧盟官方公报》2012 年 3 月 22 日 英文版 L 83/9

鉴别

分光光度法：水溶液最大吸收峰位于约 426nm 处

纯度指标

水不溶物：≤0.2%

副色素：≤1.0%

其他有机杂质：4 - 氨基苯磺酸、5 - 氧代 - 1-(4 - 磺苯基)-2 - 吡唑啉 - 3 - 羧酸、4,4'- 重氮氨基二苯磺酸、四羟基丁二酸，总含量≤0.5%

未磺化伯芳香胺（以苯胺计）：≤0.01%

中性条件下乙醚可萃取物：≤0.2%

砷：≤3 mg/kg

铅：≤2 mg/kg

汞：≤1 mg/kg

镉：≤1 mg/kg 本色素可制备铝色淀使用。 《欧盟官方公报》2012 年 英文版 L 83/10