Sodium Metabisulfite

Sodium Metabisulfite or Sodium Pyrosulfite is a yellowish disinfectant, antioxidant, and food preservative. The IUPAC names the S2O5²⁻ ion as the disulfite ion. It should not be confused with the HSO3⁻ ion, which is the former name for hydrogen sulfite.

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Sodium Metabisulfite:

Sodium metabisulfite is a widely used food additive, often designated by the code E223 in the European Union's food additive classification system. It is also known as sodium bisulfite or sodium disulfite.

  • Function: Sodium metabisulfite is primarily used as a preservative in the food industry. It acts as an antioxidant and antimicrobial agent to extend the shelf life of food.

Applications:

  • Preservative: It is used in various food products, including dried fruits, fruit juices, wines, canned vegetables, beer, and other products where preserving color and preventing microbiological deterioration are important.
  • Antioxidant Properties: Sodium metabisulfite helps prevent food oxidation, which can alter its color and flavor.
  • Possible Reactions: Some individuals may be sensitive to sodium metabisulfite, leading to allergic reactions in certain people. These reactions are more common in asthmatic individuals.
  • Labeling: When used in food products, sodium metabisulfite must be listed in the ingredient list on the label. In Europe, its E223 code can also be used.
  • Usage Limits: Regulatory authorities set limits on the use of sodium metabisulfite in foods to ensure consumer safety.
  • Alternatives: Due to allergy concerns, some people prefer to avoid foods containing sodium metabisulfite. In such cases, alternatives can be explored.

Data sheet

CAS Number
7681-57-4
HS Code
2832 30 00
Appearance
Powder
Packaging
25kg bag
Name / Reference
Sodium Metabisulfite

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