E539 - Thiosulfate de sodium

Origin

Sodium thiosulfate is an inorganic compound with the formula Na₂S₂O₃. It is typically manufactured as a pentahydrate, Na₂S₂O₃·5H₂O. It is produced on a large scale from liquid waste products of sulfur dye and coal processing. Specifically, it arises from scrubbing sulfur dioxide from flue gases and as a byproduct of the manufacture of sodium sulfide and sulfur dyes.

Usage

In food applications, sodium thiosulfate is used as a sequestrant and antioxidant. It helps to prevent discoloration and rancidity in processed foods. It is also used to dechlorinate water used in food processing, removing residual chlorine that could affect the taste or quality of the final product. Furthermore, it is used in the production of photographic film and paper, as well as in various industrial processes such as gold extraction and water treatment.

Side Effects

Sodium thiosulfate is generally recognized as safe (GRAS) by regulatory bodies when used in accordance with good manufacturing practices. There is no established ADI (Acceptable Daily Intake) for sodium thiosulfate as a food additive. However, excessive consumption of sodium salts, including sodium thiosulfate, may contribute to increased sodium intake, which can be a concern for individuals with hypertension or other sodium-sensitive conditions. Allergic reactions are rare but possible. In high doses, it can act as a mild irritant.

Regulatory Status

Sodium thiosulfate is permitted for use as a food additive in many countries, including the United States and the European Union. Regulations specify the conditions under which it can be used and the maximum permitted levels in certain food products. It is also approved for use in water treatment and various industrial applications.