E523 — Aluminium ammonium sulfate

E523, known as ammonium alum, is a food additive primarily used as a stabilizing, hardening, and loosening agent. It is commonly utilized in the preparation of candied, crystallized, and glazed fruits and vegetables, as well as in dishes based on eggs and seafood such as fish, molluscs, or crustaceans. 

Chemical Composition

Ammonium alum, also referred to as ammonium aluminum sulfate, has the chemical formula NH₄Al(SO₄)₂. It is typically encountered as the dodecahydrate form, NH₄Al(SO₄)₂·12H₂O. 

Health Considerations

The European Food Safety Authority (EFSA) has evaluated the safety of aluminium sulphates, including ammonium alum, and concluded that they pose no safety concern when used within the current authorized uses and use levels. Aluminium compounds have low bioavailability and low acute toxicity. 

Regulatory Status

Ammonium alum is permitted as a food additive in specific products, such as candied fruits and certain seafood dishes, under regulated conditions. Its use is restricted to these applications to ensure consumer safety. 

Conclusion

Ammonium alum (E523) is a food additive used for its stabilizing and hardening properties in specific food products. When used within the established guidelines, it is considered safe for consumption. As with all food additives, adherence to regulatory standards ensures its safe application in food processing.