Potassium Nitrite E249
inorganic — Primarily synthetic.
Potassium nitrite
CAS: 7758-09-0
Factual Regulatory Reference
This database provides factual regulatory information compiled from official government sources. It does not constitute medical, nutritional, or safety advice. Regulatory status varies by country and is subject to change. Always refer to your local regulatory authority for the most current information.
What Is Potassium Nitrite?
Potassium nitrite (E249) is a synthetic inorganic salt functionally equivalent to sodium nitrite (E250): both dissociate to the same nitrite ion in solution, providing identical antimicrobial activity against Clostridium botulinum and the same color-fixing effect in cured meats. It is manufactured by reduction of potassium nitrate or by absorbing nitrogen oxides in potassium hydroxide solution, and is used in cured meats such as ham, sausages, and bacon where a lower-sodium formulation is desired. Approved in the EU, USA, Japan, Australia-NZ, and Canada under strict residual limits, EFSA and JECFA share a group ADI of 0.07 mg/kg body weight per day for the nitrite ion across both E249 and E250; as with sodium nitrite, its link to N-nitrosamine formation under high-heat cooking contributed to IARC's 2015 Group 1 classification of processed meat.
? Did You Know?
Beyond food, Potassium Nitrite is also used in medicine, industrial applications. Its versatility makes it one of the most multi-purpose chemical compounds in everyday life.
Regulatory Analysis
Potassium nitrite shares the fundamental regulatory paradox of all meat-curing nitrites: its contribution to IARC's Group 1 classification of processed meat as carcinogenic coexists with its indispensable role in preventing potentially fatal botulism, creating a risk-risk trade-off that no regulatory authority has resolved through prohibition. The distinction between E249 and E250 (sodium nitrite) is pharmacologically negligible since both dissociate to the same nitrite ion, yet they carry separate E numbers and separate regulatory entries -- an artifact of additive classification systems that catalog by chemical identity rather than active moiety. This regulatory architecture obscures the reality that cumulative nitrite exposure from all sources, rather than any single additive, determines the actual risk profile.
Detailed Regulatory Assessment
European Union (EFSA)
Restricted to specific meat products; maximum residual levels 50-150 mg/kg
Official EFSA LinkUnited States (FDA)
Limited to cured meats; maximum 200 ppm
Japan (MHLW)
Strictly regulated for use in meat products
Acceptable Daily Intake (ADI)
International Standard (JECFA)
mg/kg body weight per day
European Standard (EFSA)
Natural Occurrence
This additive is not known to occur naturally in significant quantities.
Manufacturing
Produced by reduction of potassium nitrate or by absorption of nitrogen oxides in potassium hydroxide solution.
Applications Beyond Food
Used as a vasodilator (though sodium nitrite is more common).
Used in dyeing and textile industry.