Sulphur Dioxide

Sulfur dioxide is a gas that occurs naturally in small amounts in volcanic gases and is produced by the burning of sulfur. It is also made industrially by burning sulfur or by heating metal sulfides. It is a strong-smelling gas that is colorless.

Sulfur dioxide and sulfites are used as preservatives in many foods, especially dried fruits, wines, and processed potatoes. They help prevent spoilage by inhibiting the growth of bacteria, yeasts, and molds. They also act as antioxidants, preventing browning in some foods.

Sulfur dioxide and sulfites are generally recognized as safe (GRAS) by the FDA when used as preservatives. However, some people, particularly those with asthma, may be sensitive to sulfites and can experience allergic-type reactions. JECFA has evaluated sulfites and established an acceptable daily intake. The FDA requires products containing more than 10 parts per million of sulfites to list them on the label.