E539 — Sodium Thiosulfate

Sodium thiosulfate (Na₂S₂O₃) is an inorganic compound utilized in various industries, including food processing, where it functions as an antioxidant and preservative. 

Danger Level: 0 — Safe

Purpose in Products

In the food industry, sodium thiosulfate serves several functions:

  • Antioxidant: It helps prevent the oxidation of food products, thereby extending shelf life. 
  • Preservative: Sodium thiosulfate inhibits the growth of spoilage microorganisms, preserving the quality of food items.

Health Considerations

Sodium thiosulfate is considered safe for consumption when used within established limits. The European Food Safety Authority (EFSA) has evaluated its safety and concluded that it poses no health concerns at the current authorized use and use levels. 

Impact on Children

Sodium thiosulfate is safe for children when present in food products at the levels typically used in food processing.

Impact on Taste

Sodium thiosulfate is tasteless and odorless, making it an ideal ingredient for various food products without altering their flavor profiles.

Compatibility with Other Additives

Sodium thiosulfate is compatible with various other food additives, including sugars and other hydrocolloids. Its water-binding properties make it suitable for use in products requiring moisture retention.

Natural Occurrence

Sodium thiosulfate is not naturally occurring in foods but is synthetically produced for use as a food additive.

Alternatives and Substitutes

For those seeking alternatives to E539, options include:

  • Sodium Metabisulfite (E223): Another antioxidant and preservative used in food processing.
  • Ascorbic Acid (Vitamin C) (E300): A natural antioxidant used to preserve food freshness.

Regulation

Sodium thiosulfate is approved for use as a food additive in many countries, including the European Union, where it is designated as E539. Regulatory bodies such as the European Food Safety Authority (EFSA) have evaluated its safety and concluded that it poses no health concerns when used within established limits. 

Conclusion

Sodium thiosulfate (E539) is a versatile and safe food additive used primarily as an antioxidant and preservative. Its unique properties make it valuable in various food products, enhancing texture and stability. While generally safe, individuals with specific sensitivities should exercise caution.