Ca2+ affinities of BAPTA chelators—Table 19.7

Chelator	Water-Soluble Salt	Cell-Permeant Ester	K_d for Ca²⁺
BAPTA	B1204, B1212, B1214	B1205, B6769	No Mg²⁺: 160 nM * 1 mM Mg²⁺: 700 nM †
5,5'-Dibromo BAPTA	D1211	NA	No Mg²⁺: 1.6 µM ‡
5,5'-Difluoro BAPTA	NA	D1209	No Mg²⁺: 635 nM § 1 mM Mg²⁺: 705 nM §
5,5'-Dimethyl BAPTA	NA	D1207	No Mg²⁺: 40 nM ‡
* Measured in 10 mM MOPS, 100 mM KCl, pH 7.2 at 22°C. † Measured in 10 mM HEPES, 300 mM KCl, pH 7.0 at 22°C. ‡ Measured in 10 mM MOPS, 100 mM KCl, pH 7.3 at 22°C. § Measured in 10 mM HEPES, 115 mM KCl, 20 mM NaCl, pH 7.05. NA = Not available.

For Research Use Only. Not for use in diagnostic procedures.

Ca²⁺ Affinities of BAPTA Chelators—Table 19.7