EGTA Ethyleneglycol-bis (2-aminoethyl) N,N,N,N,-tetra-acetic acid) Like EDTA a chelator of divalent cations but with a higher affinity for calcium (log Kapp 6.68 at pH 7) than magnesium (log Kapp 1.61 at pH 7). Will also bind other divalent cations. Note: the 'apparent association constant', Kapp, is used because protons compete for binding and the association constant varies according to pH. Thus,
EGTA has log10 at pH 9.
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