Ammonium Carbonate (E503) – Uses & Safety
Ammonium carbonate is an inorganic compound used as a leavening agent in the food industry and historically as an expectorant in medicine.
Things worth knowing about "Ammonium carbonate"
Ammonium carbonate is an inorganic compound used as a leavening agent in the food industry and historically as an expectorant in medicine.
What is Ammonium Carbonate?
Ammonium carbonate is an inorganic salt with the chemical formula (NH&sub4;)&sub2;CO&sub3;. It consists of ammonium and carbonate ions and appears as a white crystalline powder with a characteristic pungent ammonia odor. In the food industry, ammonium carbonate is listed under the E-number E503 as a leavening agent (raising agent).
Properties and Chemical Behavior
Ammonium carbonate is sensitive to moisture and has low thermal stability. Even at room temperature, the compound slowly begins to decompose. When heated – as occurs during baking – it decomposes completely into the following gaseous products:
- Ammonia (NH&sub3;)
- Carbon dioxide (CO&sub2;)
- Water (H&sub2;O)
These gases escape completely during the baking process, leaving no residues in the finished product. This property makes ammonium carbonate an effective and residue-free leavening agent.
Use in the Food Industry
In food production, ammonium carbonate is traditionally used as a leavening agent, particularly in the manufacture of flat baked goods such as cookies, gingerbread, and crispy biscuits. Unlike baking powder, it is less suitable for voluminous, moist baked goods, as the ammonia released during decomposition can remain in products with a high moisture content, leaving an unpleasant odor.
- Gingerbread and Christmas cookies
- Butter biscuits and crackers
- Savoury baked goods
- Traditional Scandinavian baked goods (known as hjortetakksalt or hartshorn salt)
Medical and Pharmaceutical Use
Historically, ammonium carbonate – also known as hartshorn salt – was used in medicine as an expectorant to help clear mucus from the airways in respiratory conditions. It was also used as smelling salts to treat fainting episodes, as the ammonia vapors released had a stimulating effect on the mucous membranes of the respiratory tract. Today, these medical applications have largely been replaced by modern preparations.
Safety and Health Assessment
When used as intended as a food additive, ammonium carbonate is considered safe (GRAS – Generally Recognized as Safe) according to assessments by the European Food Safety Authority (EFSA) and the U.S. Food and Drug Administration (FDA). Since the compound is completely broken down during the baking process, no harmful residues remain in the finished food. However, in concentrated form or upon inhalation of ammonia vapors, the substance can be irritating to the eyes, skin, and respiratory tract.
Potential Risks from Improper Handling
- Irritation of the respiratory tract upon inhalation of ammonia vapors
- Skin and mucous membrane irritation from direct contact with concentrated solutions
- Safe in processed foods at usual quantities
Regulation in the European Union
In the EU, ammonium carbonate is approved under the food additive code E503i. Its use is permitted in certain food categories, and the EFSA regularly reviews the safety of all approved additives. Labeling requirements on food packaging oblige manufacturers to declare ammonium carbonate as an ingredient, either by name or by its E-number.
References
- European Food Safety Authority (EFSA): Re-evaluation of ammonium carbonates (E 503) as food additives. EFSA Journal, 2018.
- Belitz, H.-D.; Grosch, W.; Schieberle, P.: Food Chemistry. 4th revised and extended edition. Springer, Berlin, 2009.
- European Parliament and Council: Regulation (EC) No 1333/2008 on food additives. Official Journal of the European Union, 2008.
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