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The advantages of using sodium metabisulfite in food preservation are manifold. Its ability to act as an effective antioxidant is paramount; it prevents rancidity in fats and oils, which extends the shelf life of various food items. Furthermore, sodium metabisulfite's role in preventing enzymatic browning in fruits and vegetables keeps them looking appealing and fresh.
sodium metabisulfite in food

Potassium sorbate is the potassium salt of sorbic acid, chemical formula CH3CH=CH−CH=CH−CO2K. It is a white salt that is very soluble in water (58.2% at 20 °C). It is primarily used as a food preservative (E number 202).Potassium sorbate is effective in a variety of applications including food, wine, and personal-care products. While sorbic acid occurs naturally in rowan and hippophae berries, virtually all of the world's supply of sorbic acid, from which potassium sorbate is derived, is manufactured synthetically.