Potassium ascorbate

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Potassium ascorbate
Potassium ascorbate.png
Preferred IUPAC name
Potassium (2R)-2-[(1S)-1,2-dihydroxyethyl]-4-hydroxy-5-oxo-2,5-dihydrofuran-3-olate
Other names
Monopotassium ascorbate; Potassium L-ascorbate
  • 15421-15-5 checkY
3D model (JSmol)
ECHA InfoCard 100.035.832 Edit this at Wikidata
E number E303 (antioxidants, ...)
  • OC1=C([O-])[C@]([C@@H](O)CO)([H])OC1=O.[K+]
Molar mass 214.214 g·mol−1
980 mg/mL[1]
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references

Potassium ascorbate is a compound with formula KC6H7O6. It is the potassium salt of ascorbic acid (vitamin C) and a mineral ascorbate. As a food additive, it has E number E303, INS number 303. Although it is not a permitted food additive in the UK[2] or the USA, it is approved for use in Australia, New Zealand[3] and the EU.


  1. ^ Burdoch, George A. (1997). Encyclopedia of food and color additives. Boca Raton, Florida: CRC Press. p. 207. ISBN 0-8493-9412-0. Retrieved 2012-09-30.
  2. ^ UK Food Standards Agency: "Current EU approved additives and their E Numbers". Retrieved 2011-10-27.
  3. ^ Australia New Zealand Food Standards Code"Standard 1.2.4 - Labelling of ingredients". Retrieved 2011-10-27.