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E319 (TBHQ): Antioxidant Food Additive Explained

E319 (TBHQ) is a synthetic antioxidant food additive used to protect fats and oils from oxidation, extending the shelf life of many processed foods.

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Things worth knowing about "E319"

E319 (TBHQ) is a synthetic antioxidant food additive used to protect fats and oils from oxidation, extending the shelf life of many processed foods.

What is E319?

E319, commonly known as TBHQ (tertiary butylhydroquinone), is a synthetic food additive belonging to the group of antioxidants. It is used to protect fatty and oily foods from oxidation – a chemical process that causes fats to become rancid and reduces overall food quality. E319 is approved as a food additive in the European Union and is found in a wide range of processed food products.

Uses and Occurrence

E319 is primarily used in foods with a high fat content, where it inhibits the oxidation of fats and oils, thereby extending shelf life. Common food products that may contain E319 include:

Vegetable oils and frying fats
Crisps, crackers, and other snack foods
Ready meals and frozen foods
Nuts and peanut butter
Fast food products
Baked goods and biscuits
Cosmetics and personal care products (outside of the food sector)

Mechanism of Action

As an antioxidant, E319 works by scavenging free radicals that are generated during the oxidation of fats. Free radicals are highly reactive molecules that can trigger a chain reaction leading to the breakdown of fats. TBHQ interrupts this chain reaction, thereby slowing the development of rancidity and the degradation of fat-soluble vitamins in food. It is particularly effective in vegetable oils that are rich in polyunsaturated fatty acids.

Regulatory Approval

In the European Union, E319 is authorized under Regulation (EC) No. 1333/2008 on food additives. The European Food Safety Authority (EFSA) has evaluated the substance and established an acceptable daily intake (ADI) of 0.7 mg per kilogram of body weight per day. The maximum permitted levels in food vary by product category but typically range between 100 and 200 mg/kg of food.

In some countries outside the EU, including Japan and Canada, E319 is not approved or is only permitted under restricted conditions as a food additive.

Safety and Health Considerations

The safety of E319 is regularly reviewed by food safety authorities. When used within the approved maximum levels, E319 is considered safe for human consumption. However, several aspects continue to be discussed:

Allergic reactions: In rare cases, skin reactions and contact dermatitis have been reported in connection with TBHQ, particularly in sensitive individuals.
Animal studies: High-dose animal studies have observed negative effects on the liver and immune system at very high quantities – far exceeding the ADI. Such doses are not achievable through normal dietary intake in humans.
Neurotoxicity debate: Some older studies have discussed potential neurotoxic effects at very high doses. These findings are not considered applicable to normal everyday intake levels.

Both EFSA and the U.S. Food and Drug Administration (FDA) classify E319 as safe when used as intended. In the United States, it holds Generally Recognized As Safe (GRAS) status.

Labelling

Foods containing E319 must declare this additive in the ingredient list – either as E319 or under its chemical name Tertiary Butylhydroquinone or TBHQ. Consumers who wish to avoid food additives can use this information to make informed purchasing decisions.

References

European Food Safety Authority (EFSA): Re-evaluation of tertiary butylhydroquinone (E 319) as a food additive. EFSA Journal, 2020.
Regulation (EC) No. 1333/2008 of the European Parliament and of the Council on food additives.
U.S. Food and Drug Administration (FDA): GRAS Notice for TBHQ. Code of Federal Regulations, Title 21, Section 182.3173.

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