E228

E228 is the European food additive code for calcium metabisulfite, a calcium salt of metabisulfite used as a preservative and antioxidant (a sulfiting agent) in food and beverages. In solution it releases sulfur dioxide, which helps inhibit microbial growth and prevent browning and spoilage. The chemical formula is Ca(SO3)2, and it typically appears as a white crystalline powder that dissolves in water.

Common uses include preservation of dried fruits, wines, fruit juices, canned or bottled fruit products, and other foods where sulfites are permitted. It is often used in combination with other sulfites as part of a broader sulfiting strategy to maintain color, freshness, and shelf life.

Regulatory status and labeling: E228 is approved for use in specified foods within the EU under conditions defined by food-safety regulations. Sulfiting agents must be declared on ingredient lists when their total concentration exceeds certain thresholds, commonly 10 mg per kilogram or liter in many product categories, to alert consumers of potential sensitivities.

Safety and health: Some individuals are sulfite-sensitive and may experience adverse reactions, including asthma-like symptoms, hives, stomach upset, or other allergic responses after exposure. Because of these sensitivities, labeling and usage limits are important considerations in food processing. For most consumers, E228 is considered safe when used according to regulatory guidelines.

See also: E numbers, sulfiting agents, calcium metabisulfite.