TBHQ, tertiary butylhydroquinone is an aromatic organic compound which is a type of phenol. It is a derivative of hydroquinone, substituted with a tert-butyl group.
Used in the food and perfumery industry.
- Food preservative: In foods, TBHQ is used as a preservative for unsaturated vegetable oils and many edible animal fats. It does not cause discoloration even in the presence of iron, and does not change flavor or odor of the material to which it is added. It can be combined with other preservatives such as butylated hydroxyanisole (BHA). As a food additive, its E number is E319. It is added to a wide range of foods, with the highest limit (1 gram/kg) permitted for frozen fish and fish products. Its primary advantage is extending storage life.
- In perfumery, it is used as a fixative to lower the evaporation rate and improve stability.
- It is used industrially as a stabilizer to inhibit autopolymerization of organic peroxides.
- It is used as an antioxidant in biodiesel.
- It is also added to varnishes, lacquers, resins, and oil-field additives.
Both the European Food Safety Authority (EFSA) and the United States Food and Drug Administration (FDA) have evaluated TBHQ and determined that it is safe to consume at the concentration allowed in foods. The FDA sets an upper limit of 0.02% of the oil or fat content in foods. At very high doses, it has some negative health effects on lab animals, such as producing precursors to stomach tumors and damage to DNA. A number of studies have shown that prolonged exposure to very high doses of TBHQ may be carcinogenic, especially for stomach tumors
tert-Butylhydroquinone and tertiary butylhydroquinone
Source: Wikipedia, https://en.wikipedia.org/wiki/Tert-Butylhydroquinone