E249 - Nitrite de potassium

Origin

Potassium nitrite (E249) is an inorganic salt formed by the reaction of potassium ions with nitrite ions. It is synthetically produced. It is used primarily in the curing of meats.

Usage

E249 is used as a curing agent in meat products. Its primary function is to inhibit the growth of *Clostridium botulinum*, the bacterium responsible for botulism, a severe form of food poisoning. It also contributes to the characteristic color and flavor of cured meats. It reacts with myoglobin in the meat to form nitrosomyoglobin, which, upon heating, converts to the pink pigment nitrosoheme, giving cured meats their distinctive color. Additionally, it acts as an antioxidant, preventing rancidity and preserving the flavor of processed meats. The typical usage levels are carefully controlled due to safety concerns related to nitrite conversion to nitrosamines.

Side Effects

The main concern with potassium nitrite is its potential to form nitrosamines, particularly under high-heat cooking conditions or in the presence of certain amines. Nitrosamines are known carcinogens. The acceptable daily intake (ADI) established by the European Food Safety Authority (EFSA) is 0.07 mg/kg body weight per day for nitrite ions from all sources. Overconsumption of nitrite-containing foods can lead to methemoglobinemia, a condition where hemoglobin in the blood is unable to effectively carry oxygen. Infants are particularly susceptible to this condition. Regulations strictly control the amount of nitrite that can be added to food to minimize these risks.

Regulatory Status

Potassium nitrite (E249) is approved for use as a food additive in the European Union (EU) and is subject to strict regulations regarding its use levels and applications. Similarly, it is approved for use in the United States by the Food and Drug Administration (FDA) under specific conditions outlined in the Code of Federal Regulations (CFR). These regulations specify the maximum permissible levels in various meat products and require proper labeling to inform consumers about its presence.