Ethoxyquin (EMQ) is a

quinoline Quinoline is a heterocyclic aromatic organic compound with the chemical formula C9H7N. It is a colorless hygroscopic liquid with a strong odor. Aged samples, especially if exposed to light, become yellow and later brown. Quinoline is only sli ...

-based antioxidant used as a

food preservative Food preservation includes processes that make food more resistant to microorganism growth and slow the oxidation of fats. This slows down the decomposition and rancidification process. Food preservation may also include processes that inhibit ...

in certain countries and originally to control

scald The structured computer-aided logic design (SCALD) software was a computer aided design system developed for building the S-1 computer. It used the Stanford University Drawing System (SUDS), and it was developed by Thomas M. McWilliams and Lawrence ...

on pears after harvest (under commercial names such as "Stop-Scald").EFSA Ethoxiquin
/ref> It is used as a preservative in some pet foods to slow the development of

rancidity Rancidification is the process of complete or incomplete autoxidation or hydrolysis of fats and oils when exposed to air, light, moisture, or bacterial action, producing short-chain aldehydes, ketones and free fatty acids. When these processes o ...

of fats. Ethoxyquin is also used in some spices to prevent color loss due to oxidation of the natural carotenoid pigments.

Regulation

Ethoxyquin was developed by Monsanto in the 1950s. Ethoxyquin was initially registered as a pesticide in 1965 as an antioxidant used as a deterrent of scald in pears through post-harvest indoor application via a drench and/or impregnated wrap. As an antioxidant to control the browning of pears, ethoxyquin is approved in the United States and in the European Union. In the United States, it is approved for use as an animal

feed additive A feed additive is an additive of extra nutrient or drug for livestock. Such additives include vitamins, amino acids, fatty acids, minerals, pharmaceutical, fungal products and steroidal compounds. The additives might impact feed presentation, hygi ...

and is limited as a food additive to use only in the spices chili powder, paprika, and ground chili. Ethoxyquin is not permitted for use as food additive in Australia nor within the European Union. Ethoxyquin is allowed in the fishing industry in Norway and France as a feed stabilizer, so is commonly used in food pellets fed to farmed salmon. Norway made this practice illegal when the EU suspended authorization in 2017 and in accordance with the suspension utilized a transition period which allowed the sale of feed containing ethoxyquin until December 31st 2019, after this date it was illegal to sell feed containing ethoxyquin. Feed containing ethoxyquin had to be used by June 20th 2020. Ethoxyquin is used in pellets fed to chickens on chicken farms. In 2017 the EU suspended authorization for use as a feed additive, with various dates between 2017 and 2019 for final allowance of sale of goods so that alternatives may be phased in.

Safety

Some speculation exists that ethoxyquin in pet foods might be responsible for multiple health problems. To date, the

U.S. Food and Drug Administration The United States Food and Drug Administration (FDA or US FDA) is a federal agency of the Department of Health and Human Services. The FDA is responsible for protecting and promoting public health through the control and supervision of food ...

has only found a verifiable connection between ethoxyquin and buildup of

protoporphyrin IX Protoporphyrin IX is an organic compound, classified as a porphyrin, that plays an important role in living organisms as a precursor to other critical compounds like heme (hemoglobin) and chlorophyll. It is a deeply colored solid that is not solu ...

in the liver, as well as elevations in liver-related enzymes in some animals, but no health consequences from these effects are known. In 1997, the Center for Veterinary Medicine asked pet food manufacturers to voluntarily limit ethoxyquin levels to 75 ppm until further evidence is reported. However, most pet foods that contain ethoxyquin have never exceeded this amount. In 2017, reports from the Swiss Department for regional affairs laboratory, service of consummation and veterinary affairs showed that farmed salmon often exceeded the set limits for ethoxyquin contamination by several orders of magnitude and that health effects of the chemical on the human body were not studied in sufficient detail. In 2013, researchers at the Department of General Genetics, Molecular Biology and Plant Biotechnology, Faculty of Biology and Environmental Protection, University of Łódź, Poland, summarized the health effects of animals and humans exposed to varying levels of ethoxyquin observed in scientific studies. The summary includes: loss of weight, changes in liver, kidney, alimentary duct, urinary bladder and mitochondria, anemia, lethargy, discolored urine, skin, or fur, increase in mortality, detrimental effect on immunity, condition factor of final body weight in relation to body length of fish and inducement of allergies (contact exposure).

2015 EFSA review

A 2015 review by the

European Food Safety Authority The European Food Safety Authority (EFSA) is the agency of the European Union (EU) that provides independent scientific advice and communicates on existing and emerging risks associated with the food chain. EFSA was established in February 2002, ...

indicated that data to assess the safety of ethoxyquin as a feed additive for target animals, or its safety for consumers and the environment are lacking. The agency found one of its metabolites, ethoxyquin quinone imine, to be possibly genotoxic, and ''p''-phenetidine, an impurity that could be present from the manufacturing process, to be possibly mutagenic. In response, feed manufacturers have taken steps to significantly reduce the amount of ''p''-phenetidine in their products.

References

{{reflist Antioxidants Food antioxidants Quinolines Phenol ethers