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Ammonium ferric citrate

Highly soluble organic compound, food ingredient

Highly soluble organic compound, food ingredient

In its crystal structure each moiety of citric acid has lost four protons. The deprotonated hydroxyl group and two of the carboxylate groups ligate to the ferric center, while the third carboxylate group coordinates with the ammonium.

Uses

Ammonium ferric citrate has a range of uses, including:

  • As a food ingredient, it has an INS number 381, and is used as an acidity regulator. Most notably used in the Scottish beverage Irn-Bru.
  • Water purification
  • As a reducing agent of metal salts of low activity like gold and silver
  • With potassium ferricyanide as part of the cyanotype photographic process
  • Used in Kligler's Iron Agar (KIA) test to identify enterobacteriaceae bacteria by observing their metabolism of different sugars, producing hydrogen sulfide
  • In medical imaging, ammonium ferric citrate is used as a contrast medium.
  • As a hematinic

References

References

  1. "KEGG DRUG: Ferric ammonium citrate".
  2. PubChem. "Ammonium ferric citrate".
  3. (1998). "Synthesis, Spectroscopic and Structural Characterization of the First Mononuclear, Water Soluble Iron−Citrate Complex, (NH4)5Fe(C6H4O7)2·2H2O". J. Am. Chem. Soc..
  4. "AMMONIUM FERRIC CITRATE". World Health Organization.
  5. "Ammonium Ferric Citrate Properties, Molecular Formula, Applications – WorldOfChemicals".
  6. (28 November 2018). "Kligler's Iron Agar Test – Procedure, Uses and Interpretation".
  7. {{Merck13th
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