Potassium metabisulfite (KMBS), also known as E224, is a white crystalline powder with a pungent sulfurous odor. It is commonly used in the food and beverage industry as a preservative and antioxidant. Here are some key points about its use in food:
Uses in Food Industry
- Preservative: KMBS is widely used to inhibit the growth of bacteria, molds, and yeast in food products. It helps in extending the shelf life of various foods.
- Antioxidant: It prevents oxidative discoloration and rancidity in food products, maintaining the appearance and flavor of the food.
- Wine and Beer Making: It is commonly used in winemaking and brewing to prevent spoilage and oxidation. It helps in maintaining the color and flavor of the beverage and inhibiting unwanted microbial growth.
- Dried Fruits and Vegetables: KMBS is used to preserve the color and prevent browning of dried fruits and vegetables.
- Processed Foods: It is added to various processed foods, such as pickles, jams, and juices, to preserve freshness and extend shelf life.
Safety and Regulations
- Regulatory Status: KMBS is approved for use as a food additive by various regulatory agencies, including the FDA, EFSA, and WHO. However, its usage levels are regulated to ensure safety.
- Allergic Reactions: Some individuals, particularly those with asthma, may experience allergic reactions or sensitivity to sulfites, including potassium metabisulfite. Symptoms can include respiratory issues, skin reactions, and gastrointestinal problems.
- Maximum Permitted Levels: The maximum permitted levels of KMBS in food products vary by country and product type. Manufacturers need to comply with these regulations to ensure consumer safety.
