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2D Structure
Also known as: 1185-57-5, Ammonium iron(iii) citrate, Ferric ammonium citrate, brown, Mfcd00013099, Iron(3+) 2-hydroxypropane-1,2,3-tricarboxylate ammoniate, Ferriseltz (tn)
Molecular Formula
C6H8FeNO7
Molecular Weight
261.98  g/mol
InChI Key
FRHBOQMZUOWXQL-UHFFFAOYSA-K

1 2D Structure

2D Structure

2 Identification
2.1 Computed Descriptors
2.1.1 IUPAC Name
azane;2-hydroxypropane-1,2,3-tricarboxylate;iron(3+)
2.1.2 InChI
InChI=1S/C6H8O7.Fe.H3N/c7-3(8)1-6(13,5(11)12)2-4(9)10;;/h13H,1-2H2,(H,7,8)(H,9,10)(H,11,12);;1H3/q;+3;/p-3
2.1.3 InChI Key
FRHBOQMZUOWXQL-UHFFFAOYSA-K
2.1.4 Canonical SMILES
C(C(=O)[O-])C(CC(=O)[O-])(C(=O)[O-])O.N.[Fe+3]
2.2 Synonyms
2.2.1 Depositor-Supplied Synonyms

1. 1185-57-5

2. Ammonium Iron(iii) Citrate

3. Ferric Ammonium Citrate, Brown

4. Mfcd00013099

5. Iron(3+) 2-hydroxypropane-1,2,3-tricarboxylate Ammoniate

6. Ferriseltz (tn)

7. 1,2,3-propanetricarboxylic Acid, 2-hydroxy-, Ammonium Iron Salt

8. 7050-19-3

9. Ammonium Iron Iii Citrate

10. Ammonium Ferric Citrate;fac

11. Schembl1920826

12. Ammonium-iron(iii) Citrate, Brown

13. Ferric Ammonium Citrate (jan/usp)

14. Akos015918211

15. D01644

16. E75831

17. J-003847

18. Azane;2-hydroxypropane-1,2,3-tricarboxylate;iron(3+)

2.3 Create Date
2005-06-24
3 Chemical and Physical Properties
Molecular Weight 261.98 g/mol
Molecular Formula C6H8FeNO7
Hydrogen Bond Donor Count2
Hydrogen Bond Acceptor Count8
Rotatable Bond Count2
Exact Mass261.965012 g/mol
Monoisotopic Mass261.965012 g/mol
Topological Polar Surface Area142 Ų
Heavy Atom Count15
Formal Charge0
Complexity211
Isotope Atom Count0
Defined Atom Stereocenter Count0
Undefined Atom Stereocenter Count0
Defined Bond Stereocenter Count0
Undefined Bond Stereocenter Count0
Covalently Bonded Unit Count3
4 Drug and Medication Information
4.1 Therapeutic Uses

Source of iron in treating iron-deficiency anemias. It is less constipating than inorg forms of iron. It is free from astringent & irritant properties. However, ferric ion is less well absorbed than ferrous ion, so that its supposed advantages are outweighed by its lesser efficacy, and it is considered to be an obsolete preparation. In the forms presently marketed, a unit dose provides only the recommended daily allowance of iron (15 mg). /former use/

Osol, A. and J.E. Hoover, et al. (eds.). Remington's Pharmaceutical Sciences. 15th ed. Easton, Pennsylvania: Mack Publishing Co., 1975., p. 777


VET: Used in prevention & treatment of anemias. Oral biololgy availabilities in rats and chicks have been reported as 107 and 115% respectively, compared to ferrous sulfate. Counteracts oral poisonous effects of gossypol (in cottonseed meal) in poultry trials. Used in wide variety of oral and parenteral hematinics.

Rossoff, I.S. Handbook of Veterinary Drugs. New York: Springer Publishing Company, 1974., p. 216


Hematinic

O'Neil, M.J. (ed.). The Merck Index - An Encyclopedia of Chemicals, Drugs, and Biologicals. 13th Edition, Whitehouse Station, NJ: Merck and Co., Inc., 2001., p. 90


VET: In iron deficiency anemia.

O'Neil, M.J. (ed.). The Merck Index - An Encyclopedia of Chemicals, Drugs, and Biologicals. 13th Edition, Whitehouse Station, NJ: Merck and Co., Inc., 2001., p. 90


For more Therapeutic Uses (Complete) data for FERRIC AMMONIUM CITRATE (6 total), please visit the HSDB record page.


5 Pharmacology and Biochemistry
5.1 ATC Code

V - Various

V08 - Contrast media

V08C - Magnetic resonance imaging contrast media

V08CA - Paramagnetic contrast media

V08CA07 - Ferric ammonium citrate


5.2 Absorption, Distribution and Excretion

The absorption and endogenous excretion of iron in man was studied by monitoring the fecal excretion of a stable iron isotope (58Fe). The study was carried out for 12 healthy volunteers who were divided into two groups. Group I received 58Fe-labeled ferric ammonium citrate (III) (58FeAC) equivalent to 6 mg of iron as a control, and group II received a combination of 500 mg of vitamin C and 58FeAC. A new formula was used to calculate the 58Fe absorption ratio reflecting the pool of iron in the intestinal cells, and the ratio was compared with that obtained from Janghorbani's formula, which has been used as one of the common methods. As a result, the 58Fe absorption ratio in group II was statistically significantly higher than that of group I (34.4 +/- 6.1% vs. 15.0 +/- 5.5%, M +/- SD) using Janghorbani's formula. The similar absorption ratio (34.1 +/- 6.0% vs. 14.8 +/- 5.5%) was also obtained by our new formula. Our results confirmed the previous findings that the availability of iron is stimulated by the supplementation of vitamin C. Both formulae agreed in the absorption of iron, indicating that the endogenous excretion of iron (caused by the desquamated cells) in the intestine does not disguise the iron absorption.

PMID:1294703 Hashimoto F et al; J Nutr Sci Vitaminol (Tokyo) 38 (5): 435-49 (1992)


The absorption of a commercial brand of small-particle reduced iron was evaluated in 10 normal subjects. For each subject, the hemoglobin incorporation method was used to measure the true absorption of 60 mg of iron from either ferrous sulfate or ferric ammonium citrate. The iron tolerance test (ITT) was also studied for these two compounds and for reduced iron. This procedure consisted of measuring the area under the curve of plasma iron elevations at specified times for 6 hours, or the peak plasma iron, corrected by the plasma iron disappearance rate obtained from measuring plasma iron at specified times for 4 hours after the slow intravenous injection of 0.4 mg of iron as ferric citrate. Only the ITT was used to measure the absorption of 60 mg of reduced iron. Reference dose iron ascorbate absorption was measured in each subject. The absorption of ferric ammonium citrate and reduced iron was expressed as percent of dose and also as absorption percent of that of ferrous sulfate. Mean % geometric "true absorptions" were 39.0 for reference dose, 10.4 for FeSO4 and 2.4 for ferric ammonium citrate. The later was 23% that of FeSO4. By ITT the mean geometric % absorptions were 7.9, 3.7 and 3.2 for FeSO4, ferric ammonium citrate and reduced iron respectively, or 47 and 41% of that of FeSO4. We propose that the true absorption of the commercial brand of reduced iron tested was 20% that of FeSO4 based on the relation between the ITT results of reduced iron and the ITT and true absorption values of ferric ammonium citrate in relation to FeSO4.

PMID:11791474 Gonzalez H et al; Arch Latinoam Nutr 51 (3): 217-24 (2001)


5.3 Mechanism of Action

... Iron loading by 24-hour incubation with 0.36 mmol/L ferric ammonium citrate resulted in a decrease in the activity of nicotinamide adenine dinucleotide (NADH)-cytochrome c oxidoreductase (complex I+III) to 35.3%+/-11.2% of the value in untreated controls; of succinate-cytochrome c oxidoreductase (complex II+III) to 57.4%+/-3.1%; and of succinate dehydrogenase to 63.5%+/-12.6% (p < 0.001 in all cases). The decrease in activity of other mitochondrial enzymes, including NADH-ferricyanide reductase, succinate ubiquinone oxidoreductase (complex II), cytochrome c oxidase (complex IV), and ubiquinol cytochrome c oxidoreductase (complex III), was less impressive and ranged from 71.5%+/-15.8% to 91.5%+/-14.6% of controls. That the observed loss of respiratory enzyme activity was a specific effect of iron toxicity was clearly demonstrated by the complete restoration of enzyme activities by in vitro iron chelation therapy. Sequential treatment with iron and doxorubicin caused a loss of complex I+III and complex II+III activity that was greater than that seen with either agent alone but was only partially correctable by DF treatment. Alterations in cellular adenosine triphosphate measurements paralleled very closely the changes observed in respiratory complex activity.

PMID:9605112 Link G et al; J Lab Clin Med 131 (5): 466-74 (1998)