Sodium thiosulfate (Na2S2O3), also spelled sodium thiosulphate, is a colorless crystalline compound that is more familiar as the pentahydrate, Na2S2O3•5H2O, an efflorescent, monoclinic crystalline substance also called sodium hyposulfite or “hypo.”

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The function(s) performed by the food additive when used in cooking.

  • Antioxidant - Protects a food from deterioration caused by oxidation
  • Sequestrant - A substance which controls the availability of a cation

Data according to various sources such as fao, fda, codex. Spot a mistake? Tell us!

Country Status Matched Term
United States
Approved Sodium thiosulfate
European Union
Not Permitted
Australia and New Zealand
Not Permitted
Philippines
Approved Sodium Thiosulphate
Hungary
Not Permitted
Poland
Not Permitted
Portugal
Not Permitted
Austria
Not Permitted
Belgium
Not Permitted
Bulgaria
Not Permitted
Cyprus
Not Permitted
Czech Republic
Not Permitted
Denmark
Not Permitted
Estonia
Not Permitted
Finland
Not Permitted
France
Not Permitted
Germany
Not Permitted
Greece
Not Permitted
Ireland
Not Permitted
Italy
Not Permitted
Latvia
Not Permitted
Lithuania
Not Permitted
Luxembourg
Not Permitted
Malta
Not Permitted
Netherlands
Not Permitted
Romania
Not Permitted
Slovakia
Not Permitted
Slovenia
Not Permitted
Spain
Not Permitted
Sweden
Not Permitted
United Kingdom
Not Permitted
Australia
Not Permitted
New Zealand
Not Permitted

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Synthetic substance - yes

539 - Sodium thiosulfate: Synthetic compound. Used as anti-oxidant, especially to inhibit browning in potato products. Acceptable daily intake (ADI): Up to 0,7 mg/kg bodyweight. Side effects: Thiosulphate is converted into sulphite and has similar side effects, see E221 . Can be used by all religious groups, vegetarians and vegans.

MBM Foods

Synthetic substance - yes

539 - Sodium thiosulfate: Synthetic compound. Used as anti-oxidant, especially to inhibit browning in potato products. Acceptable daily intake (ADI): Up to 0,7 mg/kg bodyweight. Side effects: Thiosulphate is converted into sulphite and has similar side effects, see E221 . Can be used by all religious groups, vegetarians and vegans.

MBM Foods

Sodium thiosulphate
Sodium hyposulfite
Disodium dioxido-oxo-sulfanylidene-?6-sulfane
Sodium oxide sulfide (Na2S2O3)
Sodothiol
Thiosulfuric acid (H2S2O3) sodium salt (1:2)

Collection of sources used to create this food additive summary.

Source
Codex Alimentarius
Food Standards Australia New Zealand
JECFA (Joint FAO/WHO Expert Committee on Food Additives)
UK Food Guide
UK Food Standards Agency
U.S. Food and Drug Administration
Wikipedia

Lists the U.S. CAS (Chemical Abstracts Service) registry number and EINECS (European INventory of Existing Commercial chemical Substances) numbers when known.

  • CAS Number: 7772-98-7
  • EINECS Number: 231-867-5

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