Potassium hydrogen carbonate
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Description
E501(II), also known as potassium hydrogen carbonate or potassium bicarbonate, is a food additive classified as a raising agent, acidity regulator and stabilizer. It is an inorganic salt of potassium and carbonic acid, with the formula KHCO₃. It is obtained industrially by reacting potassium carbonate with carbon dioxide in aqueous solution, followed by crystallization and drying.
It is a white crystalline powder, odorless, with a salty and slightly alkaline taste. Its main function is to release carbon dioxide in the presence of acids, producing a leavening effect in doughs and beverages. It also acts as a pH regulator and a source of potassium.
Historically, potassium bicarbonate has been used in the food industry since the early 20th century, and was approved as an additive in the European Union after evaluations by EFSA (European Food Safety Authority) and JECFA (Joint FAO/WHO Expert Committee on Food Additives). EFSA established an Acceptable Daily Intake (ADI) of 3 mg/kg body weight for total potassium from additives, although potassium bicarbonate itself does not have a specific ADI due to its low toxicity. WHO also considers it safe under normal conditions of use.
Regarding the overall safety assessment, E501(II) is considered a safe additive for the general population, with no significant adverse effects at the amounts used. On food product labels, it must appear as "potassium hydrogen carbonate" or "potassium bicarbonate", or with its E number.
It is important to note that its use is regulated by Regulation (EC) No 1333/2008 on food additives, which establishes food categories and maximum permitted levels.
In summary, E501(II) is a widely used, safe and effective food additive that contributes to the texture and stability of numerous products.
E501(II) is mainly used as a raising agent in bakery, pastry and confectionery products, where it reacts with acids (such as citric acid or tartaric acid) to release CO₂ and produce a spongy texture. It is also used as an acidity regulator in beverages, dairy products, jellies and jams, and as a stabilizer in meat and fish products.
In the Spanish market, it is found in cake mixes, cookies, sliced bread, and in carbonated beverages such as sparkling mineral waters or soft drinks. EC Regulation 1333/2008 authorizes its use in various food categories, with limits varying by product: for example, in fine bakery wares (cakes, muffins) up to 20 g/kg, in non-alcoholic beverages up to 2 g/L, and in heat-treated meat products up to 5 g/kg. Compared to the FDA, which also considers it GRAS (Generally Recognized As Safe) without specific limits, the EU sets more detailed limits. In Japan, potassium bicarbonate is permitted as an additive in several similar categories.
It is important to note that its use is restricted in foods for infants and young children, where it is only allowed under certain conditions.
E501(II) is generally safe in the amounts used in foods. Documented adverse effects are rare and mainly associated with excessive potassium intake, which could cause hyperkalemia (high blood potassium levels) in people with kidney failure or those taking medications such as ACE inhibitors or potassium-sparing diuretics. Symptoms of hyperkalemia include muscle weakness, cardiac arrhythmias, and in severe cases, cardiac arrest. However, the amounts of potassium bicarbonate added to foods are small and do not pose a risk to the healthy population.
EFSA concluded that exposure to potassium from additives does not exceed the established ADI for total potassium (3 mg/kg/day) in most population groups. No carcinogenic, mutagenic or teratogenic effects have been described. In people with normal kidney function, excess potassium is eliminated in the urine. No significant interactions with other food additives are known.
In summary, E501(II) is safe under authorized conditions of use, and possible side effects would only be relevant in populations with kidney disease or under certain drug treatments.
- Potassium bicarbonate
- Potassium hydrogen carbonate
- Monopotassium carbonate
- Acid potassium salt of carbonic acid
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