Ferric ion and other polyvalent metal ions (Fe3+)

Ferric ion (Fe3+) and other polyvalent metal ions, such as aluminum (Al3+) and copper (Cu2+), are essential inorganic elements that serve as critical cofactors for enzymes and structural components of proteins (NIH, 2023). While necessary for life, an excess of these ions can lead to significant pathology; for example, free ferric iron catalyzes the formation of hydroxyl radicals via the Fenton reaction, causing oxidative damage to DNA and membranes (StatPearls, 2023). In clinical pharmacology, these ions are targeted by chelating agents—such as deferoxamine, deferasirox, and penicillamine—which bind the metal ions to form stable, water-soluble complexes that can be safely excreted (PubChem, 2024). Additionally, polyvalent ions like magnesium and aluminum are targeted in the gastrointestinal tract by antacids and phosphate binders to manage gastric acidity and hyperphosphatemia, respectively (StatPearls, 2022). Therapeutic management of these ions is vital in treating disorders like hemochromatosis, Wilson's disease, and chronic kidney disease (Mayo Clinic, 2023). However, clinicians must balance the removal of toxic excesses with the risk of depleting essential minerals, which can lead to secondary deficiencies and systemic toxicity (PubMed, 2021).

Other names

Ferric ironTrivalent metal ionsMultivalent cationsPolyvalent cationsTrivalent iron

Chelation of metal ions to form stable, excretable complexes; neutralization of gastric acid; binding of dietary phosphate in the gastrointestinal tract.