Sodium Metabisulfite As Preservative

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

Sodium metabisulfite is primarily used as a preservative and antioxidant in food products. It helps prevent spoilage by inhibiting the growth of bacteria and fungi, and it also prevents browning in fruits and vegetables. It is often found in dried fruits, wines, and processed potato products.

In the U.S., sodium metabisulfite is generally recognized as safe (GRAS) by the FDA when used according to good manufacturing practices. It can cause allergic reactions in some individuals, particularly those with asthma. The Joint FAO/WHO Expert Committee on Food Additives (JECFA) and the European Food Safety Authority (EFSA) have evaluated sulfites, including sodium metabisulfite, and have established acceptable daily intakes. Evidence on its effects at typical consumption levels is mixed, with some studies suggesting potential sensitivities in certain populations.