Glutamic acid
Interest in environmental safety has raised concerns about biodegradability of aminopolycarboxylates such as EDTA. These concerns incentivize the investigation of alternative aminopolycarboxylates. Candidate chelating agents include nitrilotriacetic acid (NTA), iminodisuccinic acid (IDS), polyaspartic acid, "S,S"-ethylenediamine-"N","N"′-disuccinic acid (EDDS), methylglycinediacetic acid (MGDA), and -Glutamic acid "N","N"-diacetic acid, tetrasodium salt (GLDA).