IUPAC name
91-53-2 YesY
3D model (Jmol) Interactive image
ChEMBL ChEMBL172064 YesY
ChemSpider 3177 YesY
ECHA InfoCard 100.001.887
E number E324 (antioxidants, ...)
PubChem 3293
UNII 9T1410R4OR YesY
Molar mass 217.31 g·mol−1
Melting point < 25 °C (77 °F; 298 K)
Boiling point 123–125 °C (253–257 °F; 396–398 K) at 2 mmHg
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
N verify (what is YesYN ?)
Infobox references

Ethoxyquin is a quinoline-based antioxidant used as a food preservative in certain countries and a pesticide (under commercial names such as "Stop-Scald") to control scald on pears after harvest.[2] It is commonly used as a preservative in pet foods to prevent the rancidification of fats. Ethoxyquin is also commonly used in spices to prevent color loss due to oxidation of the natural carotenoid pigments.[3]

There has been some speculation that ethoxyquin in pet foods might be responsible for multiple health problems. To date, the U.S. Food and Drug Administration (FDA) has only found a verifiable connection between ethoxyquin and buildup of protoporphyrin IX in the liver, as well as elevations in liver-related enzymes in some animals, but there are no known health consequences from these effects.[4] In 1997, the Center for Veterinary Medicine has asked pet food manufacturers to voluntarily limit ethoxyquin levels to 75 ppm until further evidence is reported.[4] However, most pet foods that contain ethoxyquin have never exceeded this amount.[4]

Ethoxyquin has been shown to be slightly toxic to fish.[5]

Ethoxyquin is not permitted for use in Australian foods nor is it approved for use within the European Union. It is an approved food additive in the United States.

Ethoxyquin is allowed in the fishing industry in Norway as a fat stabilizer and is therefore commonly used in food pellets fed to farmed salmon.[6]

Ethoxyquin is commonly used in pellets fed to chickens on chicken farms.[7]


  1. Merck Index, 11th Edition, 3710
  2. EFSA Ethoxiquin
  3. "R.E.D. FACTS Ethoxyquin" (PDF). United States Environmental Protection Agency. November 2004. EPA-738-F-04-006.
  4. 1 2 3 Pet Food Labels, U.S. Food and Drug Administration
  5. Ethoxyquin at the PAN pesticide database
  6. Lundebye AK, Hove H, Måge A, Bohne VJ, Hamre K. "Levels of synthetic antioxidants (ethoxyquin, butylated hydroxytoluene and butylated hydroxyanisole) in fish feed and commercially farmed fish.". National Institute of Nutrition and Seafood Research, Bergen, Norway. Retrieved 14 August 2014.
  7. Rubel DM, Freeman S (May 1998). "Allergic contact dermatitis to ethoxyquin in a farmer handling chicken feeds". Australasian Journal of Dermatology. 39 (2): 89–91. PMID 9611377.
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