Quinoline Yellow (8003-22-3)

Quinoline Yellow Chemical Structure

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What is Quinoline Yellow?

Quinoline Yellow belongs to the class of quinophthalone dyes. It is a beta-diketone and an aromatic ketone in addition to being a derivative of quinoline, having E number E104. Mostly, it is employed in the food industry as a coloring agent.

Macsen Laboratories is the leading manufacturer and supplier of Quinoline Yellow with ISO certification.
Name of Product Quinoline Yellow
IUPAC Name 2-quinolin-2-ylindene-1,3-dione
Synonyms Quinophthalone; Solvent yellow 33; 11641 Yellow; Erio Chinoline Yellow 4G; 2-(2-Quinolyl)-1,3-indandione; D&C Yellow No. 11; Amarelo Quinolina; Jaune de quinoléine
CAS No 8003-22-3
Molecular Formula C18H11NO2
Molecular Weight 273.3 g/mol
Color Index No 47000
Pubchem CID 6731
Pubchem SID 475523899


SR. No Criteria Limit/Specification
1 Appearance (form) Solid Powder or Granules
2 Appearance (colour) Bright-greenish Yellow or Canary Yellow
3 Melting Point 241 °C
4 Solubility Soluble in acetone, benzene, toluene and xylene; Slightly soluble in ethyl acetate, linseed oil, mineral oil, paraffin wax and stearic acid
5 Solubility (Color) Yellow to Very Dark Yellow
6 LogP log Kow = 4.10


  • In certain countries like the EU and Australia, Quinoline Yellow is used as a greenish yellow food additive in foods, like sauces, decorations, and coatings. Its usage as a beverage additive is also permitted.
  • Its use in pharmaceuticals and cosmetics is legalized in both Canada and the United States.
  • It is anionic in nature and is also utilized in the dying process for wool and silk.


Q. What is Quinoline Yellow Aluminium Lake?

Quinoline Yellow has the potential to be transformed into it’s equivalent aluminium lake, a pseudo-pigment form, by precipitating it with aluminium hydroxide in the form of an aluminium salt.

Q. What is the difference between Quinoline Yellow SS and Quinoline Yellow WS?

Quinoline Yellow SS is the “spirit-soluble” form of the dye and Quinoline Yellow WS is the “water-soluble” form of the dye.

Q. Is Quinoline Yellow toxic?

Quinoline Yellow has not been linked to any significant kind of long-term toxicity, it is not genotoxic or carcinogenic, and there is no indication that it has any negative impact on reproduction or development.

Q. Why was Quinoline Yellow banned?

A study commissioned by the UK’s Food Standards Agency found that when Quinoline Yellow used in a mixture of other preservatives (as in case of beverages), increased levels of hyperactivity in children, ADHD-like behavior, were observed. Thus, its use was banned by the European regulatory community but was permitted again since 2009.


Food Dyes | An overview of all the dyes currently used in Food

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