E261 Potassium Acetate – Food Additive
E261 is the EU food additive potassium acetate, a salt of acetic acid used as a preservative, acidity regulator, and buffering agent in food products.
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E261 is the EU food additive potassium acetate, a salt of acetic acid used as a preservative, acidity regulator, and buffering agent in food products.
What is E261 (Potassium Acetate)?
E261 refers to potassium acetate, the potassium salt of acetic acid. It is an approved food additive in the European Union, used as a preservative, acidity regulator, and buffering agent. In its pure form, potassium acetate is a white, crystalline, hygroscopic powder with a faintly vinegar-like odour.
Chemical Properties
Potassium acetate has the chemical formula CH₃COOK and is produced by neutralising acetic acid with potassium hydroxide or potassium carbonate. It is highly soluble in water and produces an aqueous solution with a pH of approximately 7 to 9. As a potassium salt, it supplies the mineral potassium, which is essential for numerous bodily functions.
Use in Food Products
In the food industry, E261 serves several technological purposes:
- Preservation: Inhibits the growth of bacteria and moulds, thereby extending the shelf life of food products.
- Acidity regulation: Adjusts and stabilises the pH value of food products.
- Buffering: Keeps the acidity within a defined range, which influences both flavour and texture.
- Flavour enhancement: Can round out and enhance the characteristic taste of food products.
Typical applications include baked goods, cheese products, fish products, delicatessen items, ready meals, and condiment sauces.
Safety and Health Assessment
Potassium acetate is considered safe for human consumption by the European Food Safety Authority (EFSA) when used in approved quantities. No specific Acceptable Daily Intake (ADI) value has been established, as the substance is regarded as safe under normal dietary exposure.
Since potassium acetate is a source of potassium, individuals with impaired kidney function or hyperkalaemia (elevated blood potassium levels) should monitor their intake of potassium-rich foods. For healthy individuals, typical dietary exposure poses no known risk.
Labelling and Regulation
Under EU food additive regulation (EC) No 1333/2008, E261 must be declared in the ingredient list of food products either as E261 or as potassium acetate. The maximum permitted use levels vary by food category and are defined in the relevant EU legislation.
E261 Compared to Related Additives
E261 belongs to the acetate group of food additives, which also includes E260 (acetic acid), E262 (sodium acetate), and E263 (calcium acetate). Unlike sodium acetate (E262), potassium acetate contains no sodium, making it particularly suitable for sodium-reduced product formulations. The preserving and buffering properties are broadly similar across all acetates.
References
- European Food Safety Authority (EFSA): Re-evaluation of acetic acid, ammonium acetate, potassium acetate, sodium acetate and sodium diacetate as food additives. EFSA Journal, 2018.
- European Parliament and Council of the EU: Regulation (EC) No 1333/2008 on food additives. Official Journal of the European Union, 2008.
- Joint FAO/WHO Expert Committee on Food Additives (JECFA): Evaluation of certain food additives – potassium acetate. WHO Technical Report Series, Geneva.
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