E320 - Butylhydroxyanisol

Origin

Butylated hydroxyanisole (BHA) is a synthetic antioxidant. It is produced by the chemical reaction of 4-methoxyphenol (also known as guaiacol) with isobutylene. It is a white or slightly yellow waxy solid with a faint aromatic odor.

Usage

BHA is primarily used as an antioxidant food additive. It prevents fats and oils in foods from becoming rancid. It is often used in combination with butylated hydroxytoluene (BHT). BHA is found in a wide range of products, including vegetable oils, potato chips, chewing gum, baked goods, processed meats, dry cereals, and food packaging. It is also used in cosmetics, pharmaceuticals, and animal feed. The antioxidant properties of BHA stem from its ability to scavenge free radicals, thereby inhibiting oxidation reactions that lead to spoilage. The typical usage levels in food range from 0.002% to 0.02% based on fat content.

Side Effects

The Joint FAO/WHO Expert Committee on Food Additives (JECFA) has established an Acceptable Daily Intake (ADI) of 0-0.5 mg/kg body weight for BHA. While BHA is generally considered safe at low levels, some studies have raised concerns about its potential carcinogenicity, particularly in rodents. The International Agency for Research on Cancer (IARC) has classified BHA as possibly carcinogenic to humans (Group 2B), based on sufficient evidence of carcinogenicity in experimental animals. However, human studies have been inconclusive. Some individuals may experience allergic reactions to BHA, although this is rare. Symptoms can include skin rashes or gastrointestinal upset.

Regulatory Status

BHA is approved for use as a food additive in many countries, including the United States, Canada, the European Union, and Australia. Regulations vary regarding the specific foods in which it can be used and the maximum permitted levels. In the EU, it is permitted under Directive 95/2/EC. In the United States, it is regulated under 21 CFR 172.110. The FDA allows BHA in food at levels not exceeding 0.02% of the oil or fat content. Regular re-evaluation of safety data is conducted by regulatory bodies to ensure continued safe use.