Aluminium Sulfate (E520)

Type of additive
(Glossary)		Firming Agents
E NumberE520
Chemical FormulaAl2(SO4)3
Also Known AsAluminum sulfate
Aluminium sulphate
Cake alum
Filter alum
Papermaker’s alum
Alunogenite
aluminium salt (3:2)

Purpose and Function

Aluminium sulfate is commonly used as a food additive for its functional properties:

  • Firming Agent: It is used in pickling and preserving to maintain the firmness of fruits and vegetables.
  • Acidity Regulator: Aluminium sulfate can help regulate acidity levels in food products.
  • Clarifying Agent: Often used in water treatment, it can clarify juices and other liquids by promoting coagulation.
  • Improves Texture: It enhances the texture of food products by providing a crispness to pickled foods.

Potential Risks and Side Effects

Aluminium sulfate is generally regarded as safe for consumption. However, some considerations include:

  • Gastrointestinal Issues: Excessive intake may lead to gastrointestinal discomfort, including bloating or gas, particularly for those sensitive to aluminium.
  • Allergic Reactions: Rarely, individuals may experience allergic reactions to aluminium sulfate, particularly those with sensitivities to aluminium compounds.
  • Contaminants: Sourcing from reputable suppliers is essential to minimize the risk of contaminants in food formulations.