Sodium Metabisulphite As Preservative

Sodium metabisulfite is a white or slightly yellowish crystalline powder. It is a salt of sulfurous acid, commonly produced by reacting sulfur dioxide with a solution of sodium carbonate or sodium hydroxide. It is used in various industries, including food preservation and as a reducing agent.

Sodium metabisulfite is primarily used as a preservative in foods, particularly in dried fruits, wines, and processed potatoes. It works by preventing oxidation and inhibiting the growth of microorganisms. It can also be used as a bleaching agent and a dough conditioner in baked goods.

Sodium metabisulfite is permitted for use as a food additive by the FDA. It is generally recognized as safe (GRAS) when used according to good manufacturing practices. It may cause allergic reactions in some individuals, particularly those with asthma or sulfite sensitivity. JECFA has evaluated sodium metabisulfite and established an acceptable daily intake. EFSA has also evaluated sulfites, including sodium metabisulfite, and found them to be safe at current consumption levels for the general population, though they noted potential adverse reactions in sensitive individuals.