E521 – Aluminium sodium sulfate

Description

A white, crystalline powder with astringent taste; used as a firming agent, pH regulator, and leavening agent

Risks

Notes

Aluminium sodium sulfate, commonly known as alum, is a double salt made by combining aluminium sulfate with sodium sulfate. This creates distinctive white crystals that dissolve easily in water. It can be found naturally in some mineral deposits, but the food-grade version is typically produced synthetically under controlled conditions to ensure purity and consistency. As a firming agent, aluminium sodium sulfate helps foods maintain their structure and prevents them from becoming mushy or losing their shape. It's most commonly used in pickling, particularly for making crisp dill pickles and other preserved vegetables. You might also encounter it in some specialty baking applications and in certain processed foods where maintaining texture during storage is important. This additive is synthetic and suitable for both vegetarian and vegan diets, as it contains no animal-derived ingredients. Like other aluminium compounds, it's regulated with specific usage limits, though the amounts used in food are minimal. It doesn't present allergen concerns or conflicts with religious dietary laws. Some health-conscious consumers choose to limit aluminium-containing additives, though current research suggests the levels used in food processing are not harmful.