Sodium Bisulphite

Sodium bisulfite is a chemical compound that is a salt of sulfurous acid. It is typically produced by reacting sulfur dioxide with a sodium base, such as sodium hydroxide or sodium carbonate. It appears as a white crystalline powder.

Sodium bisulfite is used as a preservative and antioxidant in many 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 commonly found in dried fruits, wines, processed potatoes, and some sauces.

In the United States, sodium bisulfite is generally recognized as safe (GRAS) by the FDA when used according to good manufacturing practices. It is known to trigger asthma attacks in a small percentage of people with asthma who are sensitive to sulfites. The Joint FAO/WHO Expert Committee on Food Additives (JECFA) has evaluated sulfites, including sodium bisulfite, and established acceptable daily intakes. Evidence on other health effects is mixed, and ongoing research continues.