Calcium ascorbate

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Calcium ascorbate
IUPAC name
Calcium (2R)-2-[(1S)-1,2-dihydroxyethyl]-4-hydroxy-5-oxo-2H-furan-3-olate
Other names
Calcium diascorbate; Calcium L-ascorbate; Hemicalcium ascorbate; Calci-C; E 302
3D model (JSmol)
ECHA InfoCard 100.126.521 Edit this at Wikidata
E number E302 (antioxidants, ...)
  • InChI=1S/2C6H8O6.Ca.2H2O/c2*7-1-2(8)5-3(9)4(10)6(11)12-5;;;/h2*2,5,7-8,10-11H,1H2;;2*1H2/q;;+2;;/p-2/t2*2-,5+;;;/m00.../s1 checkY
  • InChI=1/2C6H8O6.Ca.2H2O/c2*7-1-2(8)5-3(9)4(10)6(11)12-5;;;/h2*2,5,7-8,10-11H,1H2;;2*1H2/q;;+2;;/p-2/t2*2-,5+;;;/m00.../s1
  • [Ca+2].O=C1C(\O)=C(\[O-])O[C@@H]1[C@@H](O)CO.O=C1C(\O)=C(\[O-])O[C@@H]1[C@@H](O)CO.O.O
Molar mass 390.310 g·mol−1
About 50 g/100 mL[1]
Solubility Slightly soluble in alcohol; insoluble in ether[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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Calcium ascorbate is a compound with the molecular formula CaC12H14O12. It is the calcium salt of ascorbic acid, one of the mineral ascorbates. It is approximately 10% calcium by mass.

As a food additive, it has the E number E 302. It is approved for use as a food in the EU,[2] USA[3] and Australia and New Zealand.[4]


  1. ^ a b "Reference Tables: Description and Solubility - C". Archived from the original on 2015-01-18. Retrieved 2012-09-28.
  2. ^ UK Food Standards Agency: "Current EU approved additives and their E Numbers". Retrieved 2011-10-27.
  3. ^ US Food and Drug Administration: "Listing of Food Additives Status Part I". Food and Drug Administration. Archived from the original on 2013-03-14. Retrieved 2011-10-27.
  4. ^ Australia New Zealand Food Standards Code"Standard 1.2.4 - Labelling of ingredients". Retrieved 2011-10-27.