What is sodium metabisulfite in food

What is sodium metabisulfite in food?

Sodium metabisulfite (metabisulfite) is a common chemical compound in the chemical industry and is widely used in food, beverages and other industrial products. As a food additive, sodium metabisulfite not only has antioxidant effect, but also can be used as a preservative, which plays a vital role in the food industry. There is also some controversy over the use of sodium metabisulfite, particularly the allergic reactions it may trigger. This article will analyze in detail what is sodium metabisulfite in food, its function, scope of use and related health problems.

Definition and chemical characteristics of sodium metabisulfite

sodium metabisulfite is a colorless or white crystalline powder, soluble in water. Chemically, sodium metabisulfite is obtained by heating or reacting sodium sulfite with an acid. Its molecular formula is Na₂ S O₂. As a strong reducing agent, sodium metabisulfite can be used as a reducing agent in many chemical reactions. Its strong oxidizing properties allow it to destroy the cell walls of bacteria and molds, so it is often used as a preservative in the food industry.

Effect of sodium metabisulfite in food

in the food industry, sodium metabisulfite as a food additive, mainly has the following effects:

1. antioxidant effect: sodium metabisulfite can prevent the oxidation and deterioration of oil, vitamin C and other ingredients in food, thus prolonging the shelf life of food. For example, in fruit juices and wines, sodium metabisulfite can effectively prevent oxidation reactions and maintain the freshness of the product.

2. Antiseptic effect: Its antibacterial properties enable it to effectively inhibit the growth of bacteria, molds and other microorganisms, so it is often used in the preservation of dried fruits, canned foods, pickled foods and other foods.

3. Bleaching: Sodium metabisulfite can be used as a bleaching agent under certain conditions and is commonly used in the treatment of fruits and vegetables. By removing excess pigment, improve the appearance of food and make it more attractive.

4. Adjust acidity: sodium metabisulfite acid alkaline strong, it can be used to adjust the acidity of some foods, improve taste and texture.

Scope of use of sodium metabisulfite

sodium metabisulfite is widely used in many food fields. Common uses include:

• fruits and vegetables in dried fruits, grapes, apples and other fruits and vegetables, sodium metabisulfite is used to prevent oxidative discoloration and maintain its appearance.
• Wine and juice sodium metabisulfite is commonly used as an antioxidant to prevent these drinks from becoming sour and discolored.
• frozen food: It helps to keep the freshness of frozen food and extend the shelf life.
• Sweets and pastries sodium metabisulfite is used in some sweets and pastries to preserve and brighten.

Potential health risks of sodium metabisulfite

although the use of sodium metabisulfite in the food industry has its positive side, its safety is still a concern. Long-term or excessive intake of sodium metabisulfite may cause some health problems:

1. allergic reaction some people are allergic to sodium metabisulfite, especially those with asthma. Allergic reactions may include symptoms such as skin redness and shortness of breath.
2. Effect on vitamin B1 sodium metabisulfite may affect the body's absorption of vitamin B1, long-term consumption of foods containing too much sodium metabisulfite may lead to vitamin B1 deficiency.
3. gastrointestinal discomfort excessive intake of sodium metabisulfite may cause gastrointestinal discomfort, such as nausea, vomiting, and abdominal pain.

Use specification and safety limit of sodium metabisulfite

in order to ensure the safety of sodium metabisulfite in food, the World Health Organization (WHO) and the food safety standards of various countries stipulate its use limit. In food labels, sodium metabisulfite is generally labeled as E223, and consumers can understand its content according to the product label. According to different food types, the amount of sodium metabisulfite added is strictly limited, usually not exceeding 0.5% to ensure that it has no significant impact on health.

Summary

as a common food additive, sodium metabisulfite has multiple effects such as anti-oxidation, anti-corrosion and bleaching, and plays an important role in prolonging the shelf life and improving the appearance of food. Its use also needs to follow strict safety standards to avoid potential health risks. When consumers buy food, they can understand the content of sodium metabisulfite according to the product label, so as to make a more informed choice. I hope this article can help you better understand "what is sodium metabisulfite in food", as well as its role and potential impact in food.