Chemical Component Summary

Name AMMONIUM ION
Identifiers ammonium
azanium
Formula H4 N
Molecular Weight 18.04 g/mol
Type non-polymer
Isomeric SMILES [NH4+]
InChI InChI=1S/H3N/h1H3/p+1
InChI Key QGZKDVFQNNGYKY-UHFFFAOYSA-O

Chemical Details

Formal Charge 1
Atom Count 5
Chiral Atom Count 0
Chiral Atoms
Bond Count 4
Aromatic Bond Count 0

Drug Info: DrugBank

DrugBank ID DB09326   (Different stereochemistry)
Name Ammonia N-13
Groups approved
Description Ammonia N 13 Injection, USP is a positron emitting radiopharmaceutical that is used for diagnostic purposes in conjunction with positron emission tomography (PET) imaging. The active ingredient, [13N] ammonia, has the molecular formula of 13NH3 with a molecular weight of 16.02. Ammonia N 13 Injection, USP is used for imaging of the myocardium under rest or pharmacologic stress conditions to evaluate myocardial perfusion in patients with suspected or existing coronary artery disease.
Synonyms
  • (13N)Ammonia
  • Ammonia N 13
Brand Names
  • Ammonia N 13
  • Ammonia N 13 N 13
  • Ammonia N-13
  • Ammonian 13 N 13
Indication For diagnostic Positron Emission Tomography (PET) imaging of the myocardium under rest or pharmacologic stress conditions to evaluate myocardial perfusion in patients with suspected or existing coronary artery disease.
Pharmacology Following intravenous injection, ammonia N 13 enters the myocardium through the coronary arteries. The PET technique measures myocardial blood flow based on the assumption of a three-compartmental disposition of intravenous ammonia N 13 in the myocardium. In this model, the value of the rate constant, which represents the delivery of blood to myocardium, and the fraction of ammonia N 13 extracted into the myocardial cells, is a measure of myocardial blood flow. Optimal PET imaging of the myocardium is generally achieved between 10 to 20 minutes after administration.
Mechanism of action Ammonia N 13 Injection is a radiolabeled analog of ammonia that is distributed to all organs of the body after intravenous administration. It is extracted from the blood in the coronary capillaries into the myocardial cells where it is metabolized to glutamine N 13 and retained in the cells. The presence of ammonia N 13 and glutamine N 13 in the myocardium allows for PET imaging of the myocardium.
Route of administration Intravenous
CAS number 34819-78-8
Drug Info/Drug Targets: DrugBank 3.0: a comprehensive resource for 'omics' research on drugs. Knox C, Law V, Jewison T, Liu P, Ly S, Frolkis A, Pon A, Banco K, Mak C, Neveu V, Djoumbou Y, Eisner R, Guo AC, Wishart DS. Nucleic Acids Res. 2011 Jan; 39 (Database issue):D1035-41. | PMID: 21059682