Ammonium ferric citrate
Ammonium ferric citrate has the formula (NH4)5[Fe(C6H4O7)2]. A distinguishing feature of this compound is that it is very soluble in water, in contrast to ferric citrate which is not very soluble.
-citrat_V7.svg.png) Structure of ammonium ferric citrate | |
 Crystal structure of (NH4)5[Fe(C6H4O7)2]·2H2O[1] | |
| Names | |
|---|---|
| IUPAC name
2-Hydroxypropane-1,2,3-tricarboxylate, ammonium iron(3+) salt | |
| Other names
Ferric ammonium citrate Ammonium iron(III) citrate Ammonium ferric citrate Iron ammonium citrate FerriSeltz | |
| Identifiers | |
CAS Number |
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| ChEBI | |
| ChEMBL | |
| ECHA InfoCard | 100.013.351 |
| EC Number |
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| E number | E381 (antioxidants, ...) |
| KEGG | |
PubChem CID |
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| UNII | |
CompTox Dashboard (EPA) |
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InChI
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| Properties | |
Chemical formula |
C6H8O7⋅xFe3+⋅yNH3 |
| Appearance | yellow crystals |
| Pharmacology | |
ATC code |
V08CA07 (WHO) |
| Hazards | |
| Safety data sheet | |
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 | |
In its crystal structure each citric acid moiety 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.[1]
Uses
Ammonium ferric citrate has a range of uses, including:
- As a food additive, where it has the E number E381, 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 iron deeps to determine hydrogen sulfide production in microbial metabolism.
- In medical imaging, ammonium ferric citrate is used as a contrast medium.
- As a hematinic.[3]
See also
- Food additive
- List of food additives
References
- Matzapetakis, M.; Raptopoulou, C. P.; Tsohos, A.; Papaefthymiou, V.; Moon, N.; Salifoglou, A. (1998). "Synthesis, Spectroscopic and Structural Characterization of the First Mononuclear, Water Soluble Iron−Citrate Complex, (NH4)5Fe(C6H4O7)2·2H2O". J. Am. Chem. Soc. 120 (50): 13266–13267. doi:10.1021/ja9807035.
- "KEGG DRUG: Ferric ammonium citrate".
- Budavari, Susan, ed. (2001), The Merck Index: An Encyclopedia of Chemicals, Drugs, and Biologicals (13th ed.), Merck, ISBN 0911910131
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