E221

Sodium sulfite (E221) is a salt of sulfurous acid. It is a white crystalline powder that is soluble in water. It is produced industrially by reacting sulfur dioxide with a solution of sodium carbonate or sodium hydroxide.

Sodium sulfite is used as a preservative and antioxidant in food. It prevents browning in dried fruits and vegetables, and it inhibits the growth of bacteria and mold in some foods. It is commonly found in dried fruits, canned vegetables, and some processed seafood.

Sodium sulfite is an FDA-approved food additive. It is generally recognized as safe (GRAS) when used according to good manufacturing practices. However, some individuals, particularly those with asthma, may be sensitive to sulfites and experience allergic-type reactions. JECFA and EFSA have evaluated sulfites and established acceptable daily intakes. The FDA requires foods containing more than 10 parts per million of sulfites to declare them on the label.