Aminopolycarboxylic acid

a metal complex with the EDTA anion
Aspartic acid is an aminodicarboxylic acid and precursor to other ligands.

An aminopolycarboxylic acid (sometimes abbreviated APCA) is a chemical compound containing one or more nitrogen atoms connected through carbon atoms to two or more carboxyl groups. Aminopolycarboxylates that have lost acidic protons form strong complexes with metal ions. This property makes aminopolycarboxylic acids useful complexone in a wide variety of chemical, medical, and environmental applications.[1]

  1. ^ Anderegg, G.; Arnaud-Neu, F.; Delgado, R.; Felcman, J.; Popov, K. (2005). "Critical evaluation of stability constants of metal complexes of complexones for biomedical and environmental applications* (IUPAC Technical Report)". Pure Appl. Chem. 77 (8): 1445–1495. doi:10.1351/pac200577081445. hdl:20.500.11850/423005. pdf