E321 - Butylhydroxytoluen

Origin

Butylated hydroxytoluene (BHT) is a synthetic antioxidant. It is a derivative of phenol and is structurally related to butylated hydroxyanisole (BHA). BHT is produced industrially through a chemical reaction involving p-cresol and isobutylene.

Usage

BHT is primarily used as an antioxidant food additive. It prevents or slows down the oxidation of fats and oils, thereby preventing rancidity and extending the shelf life of food products. It is commonly found in vegetable oils, shortening, cereals, potato chips, and other processed foods. BHT is also used in animal feed, cosmetics, pharmaceuticals, and industrial products such as rubber and petroleum products. The acceptable daily intake (ADI) for BHT, as established by the World Health Organization (WHO), is 0-0.3 mg/kg body weight per day. However, regulatory limits vary by country and application. In food, the concentration of BHT is typically limited to a maximum level based on the fat content of the food.

Side Effects

While BHT is generally considered safe at permitted levels, some studies have raised concerns about potential health effects. Some animal studies have suggested that high doses of BHT may cause liver and thyroid effects. However, these effects have not been consistently observed in human studies. Some individuals may experience allergic reactions to BHT, although this is rare. There is ongoing debate and research regarding the long-term effects of BHT consumption. Some studies suggest potential carcinogenic effects at very high doses, while others suggest potential anti-carcinogenic properties. More research is needed to fully understand the potential health effects of BHT.

Regulatory Status

BHT is approved for use as a food additive in many countries, including the United States, Canada, and the European Union. However, the permitted levels and specific applications may vary. In the United States, BHT is generally recognized as safe (GRAS) by the Food and Drug Administration (FDA) when used in accordance with good manufacturing practices. In the European Union, BHT is permitted as a food additive under the E number E321, subject to specific conditions and maximum levels.