Potassium propionate

E283 is mainly used in bakery and pastry products (sliced bread, buns, cakes) to prevent mold and extend shelf life. It is also used in dairy products such as processed cheeses and yogurts, as well as in some meat products and sauces.

In the Spanish market, it is commonly found in industrial sliced bread, hamburger buns, packaged pastries, and some processed cheeses. According to EC Regulation 1333/2008, maximum limits vary: in sliced bread up to 3000 mg/kg, in whole wheat bread up to 2000 mg/kg, in processed cheeses up to 3000 mg/kg. In the United States, the FDA considers it GRAS (Generally Recognized as Safe) and allows its use in bakery products up to 0.3% of product weight. In Japan, its use is permitted in bread and cakes with similar limits. There are no significant differences in international regulations.

Documented adverse effects of potassium propionate are rare and mild. In animal studies, very high doses (over 1000 mg/kg/day) have shown gastric irritation and reduced growth, but these levels are far above the ADI. In humans, no significant adverse effects have been reported at authorized use levels. Some individuals may experience mild digestive discomfort if they consume large amounts of foods containing propionates, but there is no evidence of chronic toxicity.

The antimicrobial mechanism of action is based on the ability of undissociated propionic acid to penetrate the cell membrane of microorganisms, acidifying the cytoplasm and inhibiting key enzymes. No particularly sensitive populations have been identified, although people with allergy to calcium propionate (E282) could cross-react, but this is extremely rare. No interactions with medications are known.

EFSA and WHO conclude that potassium propionate is safe at the doses used as a food additive.

• Potassium propionate
• Potassium salt of propionic acid
• Propionic acid potassium salt