Sodium Metabsulfite

Sodium metabisulfite is a white or slightly yellowish crystalline powder. It is a salt of sulfurous acid, formed by combining sulfur dioxide with a solution of sodium hydroxide or sodium carbonate. It is commonly produced industrially.

Sodium metabisulfite is primarily used as a preservative and antioxidant in foods. It helps prevent spoilage by inhibiting the growth of bacteria and fungi, and it can also prevent browning in dried fruits and vegetables. It is often found in dried fruits, processed potatoes, wine, and some baked goods.

Sodium metabisulfite is generally recognized as safe (GRAS) by the FDA for use as an antimicrobial agent and antioxidant. It can cause allergic reactions in some individuals, particularly those with asthma or sulfite sensitivity. The Joint FAO/WHO Expert Committee on Food Additives (JECFA) has evaluated sodium metabisulfite and established an acceptable daily intake. While generally considered safe at typical consumption levels, high intakes may cause adverse effects in sensitive individuals.