E220, or sulfur dioxide (SO₂), is a colorless gas with a pungent odor. It is naturally produced by volcanic eruptions and industrial processes but can also be synthesized for use in food. Sulfur dioxide is a key ingredient in the production of sulfites, which are frequently used as preservatives in a variety of food products, including dried fruits, wines, and some packaged foods. The compound is particularly effective at preventing the growth of bacteria, yeasts, and molds, thereby helping to prolong the shelf-life of perishable items.
Residual solvents are organic volatile chemicals that can remain in pharmaceutical products as a result of manufacturing processes. They are not active ingredients, yet their presence can pose significant safety and quality concerns for both consumers and regulatory bodies. Understanding residual solvents is crucial for ensuring drug purity, safety, and efficacy.