Ethoxyquin

Ethoxyquin (EMQ) is a quinoline-based antioxidant used as a food preservative in certain countries and originally to control scald on pears after harvest (under commercial names such as 'Stop-Scald'). It is used as a preservative in some pet foods to slow the development of rancidity of fats. Ethoxyquin is also used in some spices to prevent color loss due to oxidation of the natural carotenoid pigments. Ethoxyquin (EMQ) is a quinoline-based antioxidant used as a food preservative in certain countries and originally to control scald on pears after harvest (under commercial names such as 'Stop-Scald'). It is used as a preservative in some pet foods to slow the development of rancidity of fats. Ethoxyquin is also used in some spices to prevent color loss due to oxidation of the natural carotenoid pigments. 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 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. 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. Some speculation exists that ethoxyquin in pet foods might be responsible for multiple health problems. To date, the U.S. Food and Drug Administration 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 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. A 2015 review by the European Food Safety Authority 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.