Potassium nitrite
Score impact
-1.10
points/product
Description
E249, potassium nitrite (KNO2), is a food additive in the preservative category, mainly used to preserve meat and meat products. It is an inorganic salt, white or slightly yellowish, highly soluble in water, with a slightly bitter taste.
Industrially, it is obtained by reacting potassium hydroxide with nitrogen oxides or by reducing potassium nitrate. Its main function is to inhibit the growth of pathogenic bacteria such as Clostridium botulinum, which causes botulism, and it also helps fix the characteristic red color of cured meats and enhance their flavor.
Historically, the use of nitrites in meat preservation dates back to ancient times, but its approval as an additive in the European Union was formalized with Directive 95/2/EC, currently regulated by Regulation (EC) 1333/2008. The European Food Safety Authority (EFSA) has evaluated E249 several times, most recently in 2017, establishing an Acceptable Daily Intake (ADI) of 0-0.07 mg/kg body weight per day, expressed as nitrite ion. The World Health Organization (WHO) and the Joint FAO/WHO Expert Committee on Food Additives (JECFA) have also set the same ADI.
The overall safety assessment is that, within the established limits, potassium nitrite is safe for consumers. However, controversy exists due to the possible formation of nitrosamines, carcinogenic compounds, when nitrites react with secondary amines present in food or in the stomach. Therefore, regulations require the addition of antioxidants such as ascorbic acid (E300) to minimize such formation. On the label, it must appear as 'potassium nitrite' or 'E249'.
E249 is mainly used in cured and heat-treated meat products, such as cooked ham, sausages, bacon, chorizo, salami, mortadella, and other cold cuts. It is also used in some fish products and canned meats. According to Regulation (EC) 1333/2008, the maximum authorized amount in the EU is 150 mg/kg of final product (expressed as NaNO2) for most meat products, although in some cases like bacon it can reach 175 mg/kg.
In Spain, it is common to find E249 in brands such as Campofrío, El Pozo, Noel, or Casa Tarradellas. Compared to the US FDA, limits are similar (200 ppm or 200 mg/kg), but the FDA allows its use in smoked fish, while the EU has stricter restrictions. In Japan, the use of nitrites is more limited and only allowed in certain meat products.
Documented adverse effects of E249 are mainly related to the formation of nitrosamines, potentially carcinogenic compounds. Epidemiological studies have associated high consumption of processed meats with nitrites with an increased risk of colorectal cancer, although the evidence is not conclusive due to confounding factors.
The biological mechanism involves the reaction of nitrites with secondary amines in the acidic environment of the stomach, forming nitrosamines. Sensitive populations include infants under 6 months, as their fetal hemoglobin is more susceptible to methemoglobinemia (inability to transport oxygen) caused by nitrites. Therefore, consumption of cured meats is not recommended for infants. Drug interactions: nitrites may potentiate the effect of antihypertensive or vasodilator drugs.
EFSA concludes that, respecting the ADI and conditions of use (with antioxidants), the risk is low. The WHO classifies processed meats as 'probably carcinogenic to humans' (Group 2A), but the additive itself is not considered carcinogenic at authorized doses.
- Potassium nitrite
- Nitrous acid potassium salt
- Potassium nitrite anhydrous
- Potassium curing agent
- Technical potassium nitrite
- Potassium salt of nitrous acid
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