Sodium propionate

(Redirected from Sodium propanoate)

Sodium propanoate or sodium propionate is the sodium salt of propionic acid which has the chemical formula Na(C2H5COO). This white crystalline solid is deliquescent in moist air.

Sodium propionate[1]
Preferred IUPAC name
Sodium propanoate
Other names
Sodium propionate
3D model (JSmol)
ECHA InfoCard 100.004.810 Edit this at Wikidata
EC Number
  • 205-290-4
E number E281 (preservatives)
  • InChI=1S/C3H6O2.Na/c1-2-3(4)5;/h2H2,1H3,(H,4,5);/q;+1/p-1 checkY
  • InChI=1/C3H6O2.Na/c1-2-3(4)5;/h2H2,1H3,(H,4,5);/q;+1/p-1
  • [Na+].[O-]C(=O)CC
Molar mass 96.060 g/mol
Appearance Transparent crystals
Odor faint acetic-butyric odor
Melting point 289 °C (552 °F; 562 K)
1 g/ml
Solubility in ethanol 41.7 g/L
S01AX10 (WHO) QA16QA02 (WHO)
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Reactions edit

It is produced by the reaction of propionic acid and sodium carbonate or sodium hydroxide.

Uses edit

It is used as a food preservative and is represented by the food labeling E number E281 in Europe; it is used primarily as a mold inhibitor in bakery products. It is approved for use as a food additive in the EU,[2] USA[3] and Australia and New Zealand[4] (where it is listed by its INS number 281).

Structure edit

Structure of sodium propionate, with methyl groups and H atoms omitted.[5] Color code: red = O, blue = Na.

Anhydrous sodium propionate is a polymeric structure, featuring trigonal prismatic Na+ centers bonded to six oxygen ligands provided by the carboxylates. A layered structure is observed, with the hydrophobic ethyl groups projecting into the layered galleries. With hydrated sodium propionate, some of these Na-carboxylate linkages are displaced by water.

See also edit

References edit

  1. ^ Merck Index, 11th Edition, 8623.
  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 II". Food and Drug Administration. Retrieved 2011-10-27.
  4. ^ Australia New Zealand Food Standards Code"Standard 1.2.4 - Labelling of ingredients". Retrieved 2011-10-27.
  5. ^ Fábry, Jan; Samolová, Erika (2020). "Layered alkali propanoatesM+(C2H5COO)−;M+= Na+, K+, Rb+, Cs+". Acta Crystallographica Section E. 76 (9): 1508–1513. Bibcode:2020AcCrE..76.1508F. doi:10.1107/S2056989020011469. PMC 7472758. PMID 32939309.

External links edit