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E304 Ascorbyl Palmitate – Food Antioxidant

E304 is the food additive ascorbyl palmitate, a fat-soluble antioxidant used to protect foods from oxidative spoilage and extend their shelf life.

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Things worth knowing about "E304"

E304 is the food additive ascorbyl palmitate, a fat-soluble antioxidant used to protect foods from oxidative spoilage and extend their shelf life.

What is E304?

E304 is the European Union designation for ascorbyl palmitate, a synthetically produced, fat-soluble ester formed from ascorbic acid (vitamin C) and palmitic acid (a saturated fatty acid). As an approved food additive, E304 belongs to the category of antioxidants and is used to protect foods from oxidative spoilage and to extend their shelf life.

Origin and Production

Ascorbyl palmitate is produced through the chemical esterification of ascorbic acid with palmitic acid. Although ascorbic acid occurs naturally in fruits and vegetables, the ester used as E304 is industrially synthesized. The resulting product is a white to yellowish powder that dissolves readily in fats and oils but is poorly soluble in water.

Function and Mechanism of Action

Ascorbyl palmitate acts as a free radical scavenger: it neutralizes free radicals generated by oxygen contact in fatty foods, which would otherwise cause rancidity, discoloration, and the degradation of vitamins and flavors. Because E304 is fat-soluble, it can act directly within the lipid phase of a food product — where water-soluble vitamin C (E300) provides insufficient protection.

Prevents oxidative spoilage (rancidity) of fats and oils
Protects fat-soluble vitamins (e.g., vitamins A, D, E) from oxidation
Stabilizes flavors, colors, and nutrients in food products
Extends the shelf life of products

Applications

E304 is used in a wide range of food products, including:

Edible oils, fats, and margarine
Baked goods and snack foods
Baby food and infant formula
Dietary supplements (as an antioxidant for fat-soluble active ingredients)
Cosmetics and pharmaceuticals (outside the food sector)

Safety and Tolerability

E304 is considered safe by the relevant regulatory authorities, including the European Food Safety Authority (EFSA) and the WHO. No Acceptable Daily Intake (ADI) value has been established, as studies have not demonstrated any harmful effects. In the body, ascorbyl palmitate is broken down into ascorbic acid and palmitic acid, both of which are natural components of human metabolism.

Allergic reactions or intolerances to E304 are very rare and have barely been documented to date. Individuals with a known sensitivity to vitamin C derivatives should nonetheless check the ingredient lists of products.

Labeling

In the European Union, E304 must be declared in the ingredient list in accordance with Food Information Regulation (EU) No 1169/2011, either as E304 or under the functional name antioxidant together with the E number.

References

European Food Safety Authority (EFSA): Re-evaluation of ascorbyl palmitate (E304) as a food additive. EFSA Journal, 2016.
World Health Organization (WHO) / FAO: Monographs on food additives - Ascorbyl Palmitate. Joint FAO/WHO Expert Committee on Food Additives (JECFA).
Regulation (EC) No 1333/2008 of the European Parliament and of the Council on food additives.

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