Sulpher Dioxide
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What it is
Sulfur dioxide is a gas that occurs naturally in small amounts in the air. It is made industrially by burning sulfur or by heating metal sulfides. It is commonly used in its salt forms, like sodium sulfite or potassium metabisulfite.
Why it's used
Sulfur dioxide and its salts are used as preservatives in foods. They prevent spoilage by inhibiting the growth of bacteria, yeasts, and molds. They also act as antioxidants, preserving the color and flavor of foods like dried fruits, wines, and processed potatoes.
Health notes
Sulfur dioxide is generally recognized as safe (GRAS) by the FDA when used according to good manufacturing practices. Some individuals, particularly those with asthma, may be sensitive to sulfites and experience allergic-type reactions. The Joint FAO/WHO Expert Committee on Food Additives (JECFA) has evaluated sulfites and established acceptable daily intake levels. Evidence on the health effects of sulfites at typical consumption levels is mixed, with some studies suggesting potential adverse effects in sensitive individuals, while others find them safe for the general population.
Allergen info
Sulfur dioxide is not one of the nine major allergens and does not contain gluten.