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.


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.


  • 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
HS Code
2832 30 00
25kg bag
Name / Reference
Sodium Metabisulfite

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