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E309 Delta-Tocopherol – Antioxidant Food Additive

E309 (delta-tocopherol) is a synthetic antioxidant food additive from the vitamin E family, used to protect fats and oils in processed foods from oxidation and rancidity.

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Things worth knowing about "E309"

E309 (delta-tocopherol) is a synthetic antioxidant food additive from the vitamin E family, used to protect fats and oils in processed foods from oxidation and rancidity.

What is E309?

E309 is the EU designation for delta-tocopherol (δ-tocopherol), a synthetically produced antioxidant belonging to the tocopherol group. Tocopherols are chemical compounds structurally related to vitamin E. Delta-tocopherol is one of four naturally occurring tocopherols (alpha, beta, gamma, delta), but has the lowest vitamin E biological activity among them. As a food additive, E309 is used in its synthetic form to protect fats and oils in processed foods from oxidative degradation.

Uses in Food

E309 is used as an antioxidant in the food industry. Its primary function is to prevent the spoilage of fat-containing foods through oxidation, which can lead to rancidity, loss of flavour, and degradation of nutrients. Typical applications include:

Edible oils and margarines
Baked goods and snack products
Baby food and infant formula
Dietary supplements
Processed meat and fish products

Within the European Union, the use of E309 is regulated by Regulation (EC) No 1333/2008 on food additives. Permitted quantities vary by food category and are established by the European Food Safety Authority (EFSA).

Mechanism of Action

Delta-tocopherol acts as a free radical scavenger (antioxidant). It interrupts the chain reaction of lipid peroxidation by neutralising free radicals that form when fats come into contact with oxygen. The tocopherol molecule donates a hydrogen atom to the free radical and is itself converted into a stable, less reactive form. This mechanism significantly extends the shelf life of fatty foods and preserves their sensory quality.

Safety and Health Assessment

The EFSA (European Food Safety Authority) has assessed tocopherols, including delta-tocopherol (E309), as safe when used within approved quantities. As a compound belonging to the vitamin E group, E309 is generally considered well tolerated. However, the following points should be noted:

Vitamin E activity: Delta-tocopherol has only low biological vitamin E potency compared to alpha-tocopherol, making a significant contribution to vitamin E status through food additives unlikely.
High doses: At very high intakes, tocopherols may potentially affect blood clotting and interact with anticoagulant medications (e.g., warfarin).
Synthetic origin: As a synthetic additive, E309 differs slightly in chemical composition from naturally occurring delta-tocopherol.

For the general population, the quantities of E309 consumed through food are considered safe.

Differences from Other Tocopherols (E306–E308)

Several tocopherol-based additives are approved in the EU:

E306 – Tocopherol-rich extracts (natural)
E307 – Alpha-tocopherol (synthetic)
E308 – Gamma-tocopherol (synthetic)
E309 – Delta-tocopherol (synthetic)

Delta-tocopherol (E309) is noted for its particularly high antioxidant effectiveness against lipid oxidation, even though its vitamin E activity is low. Gamma- and delta-tocopherol are generally considered more potent antioxidants in fatty matrices than alpha-tocopherol.

Labelling

Foods containing E309 must declare this additive in the ingredients list either by the name delta-tocopherol or the E-number E309. Consumers wishing to avoid synthetic additives may choose products stabilised with natural antioxidants such as E306 (tocopherol-rich extracts) or rosemary extract.

References

European Food Safety Authority (EFSA): Re-evaluation of tocopherol-rich extracts (E 306), alpha-tocopherol (E 307), gamma-tocopherol (E 308) and delta-tocopherol (E 309) as food additives. EFSA Journal 2015; 13(6):4144.
Regulation (EC) No 1333/2008 of the European Parliament and of the Council of 16 December 2008 on food additives.
Zingg J.-M.: Vitamin E: A Role in Signal Transduction. Annual Review of Nutrition, 2015; 35: 135–173.

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