E250 – Sodium Nitrite: Uses, Effects and Health
E250 is the EU food additive sodium nitrite, a preservative used in meat and cured products to inhibit bacterial growth and stabilize color.
Things worth knowing about "E250"
E250 is the EU food additive sodium nitrite, a preservative used in meat and cured products to inhibit bacterial growth and stabilize color.
What is E250?
E250 is the designation for the food additive sodium nitrite (chemical formula: NaNO2). It is an inorganic salt approved for use in the European Union as a preservative and color stabilizer, primarily in the processing of meat and cured food products.
Use in Food Products
E250 is commonly found in the following foods:
- Cured and processed meat products (e.g., ham, salami, bacon, frankfurter sausages)
- Certain fish products
- Some hard cheeses (within permitted limits)
In practice, E250 is frequently used as part of curing salt, a mixture of table salt and sodium nitrite. The maximum permitted levels are defined under EU food additive legislation (Regulation EC No. 1333/2008).
Mechanism of Action
Sodium nitrite exerts its preservative and technological effects through several mechanisms:
- Antimicrobial action: E250 effectively inhibits the growth of dangerous bacteria such as Clostridium botulinum, the organism responsible for the life-threatening illness botulism. It interferes with bacterial metabolic activity and prevents the formation of botulinum toxin.
- Color stabilization: Sodium nitrite reacts with the muscle pigment myoglobin to form nitrosomyoglobin, which gives cured meats their characteristic pink-red color and keeps it stable over time.
- Antioxidant effect: E250 slows down lipid oxidation in meat products, thereby extending shelf life and helping to preserve flavor.
Health Assessment
In its pure form, sodium nitrite is a toxic substance and may only be used in food within strictly regulated low concentrations. Inside the human body, sodium nitrite can – particularly in the acidic environment of the stomach – react with protein breakdown products (amines) to form nitrosamines. Some nitrosamines are considered potentially carcinogenic.
The European Food Safety Authority (EFSA) has conducted several evaluations of the use of nitrites in food. A comprehensive re-evaluation published in 2017 concluded that the dietary intake of nitrites from processed meats represents a small but non-negligible health risk, particularly regarding nitrosamine formation. The Acceptable Daily Intake (ADI) for nitrite is set at 0.07 mg per kg of body weight per day.
The World Health Organization (WHO) and the International Agency for Research on Cancer (IARC) have classified processed meat as a Group 1 carcinogen, with nitrites identified as a contributing factor.
Labeling and Consumer Information
Foods containing E250 must declare it in the ingredient list, either as E250 or as sodium nitrite. Consumers who are health-conscious or at elevated risk – such as pregnant women and children – are advised to limit their consumption of products containing curing salts with sodium nitrite.
Alternatives and Current Developments
Due to ongoing health discussions, there is increasing interest in replacing sodium nitrite with natural alternatives, such as vegetable extracts (e.g., celery or spinach powder) that naturally contain nitrate. However, products marketed as no added nitrites may still contain nitrite as a result of the natural conversion of nitrate in the food itself.
References
- European Food Safety Authority (EFSA): Re-evaluation of potassium nitrite (E 249) and sodium nitrite (E 250) as food additives. EFSA Journal 2017;15(6):4786.
- Regulation (EC) No 1333/2008 of the European Parliament and of the Council of 16 December 2008 on food additives.
- World Health Organization (WHO) / International Agency for Research on Cancer (IARC): IARC Monographs Volume 114 – Consumption of Red Meat and Processed Meat. Lyon, 2015.
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