The primary use of glacial acetic acid is in the production of various chemicals. It serves as a vital feedstock for the synthesis of acetic anhydride, which is further used in the manufacture of plastics, fibers, and pharmaceuticals. Glacial acetic acid is also integral in producing acetate esters, which are widely used as solvents or in making synthetic flavors and fragrances. In addition, it is involved in the production of peracetic acid, a strong oxidizing agent with applications in disinfection and sterilization.
E920 is a naturally occurring amino acid—specifically L-cysteine—that is vital for numerous biological processes. In the food industry, it is primarily utilized as a dough conditioner, which helps to improve the texture and rise of baked goods. It serves as a reducing agent in bread making, allowing for better fermentation and overall dough performance. E920 can be derived from various sources, including human hair, feathers, and even some animal products, raising ethical concerns, particularly about its use in vegetarian and vegan products.