• CAT Number: R020566
  • CAS Number: 126150-97-8
  • Molecular Formula: C34H40N2O18
  • Molecular Weight: 764.7
  • Purity: ≥95%
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BAPTA (Item No. <span class=/itemid/>11706</span>) is membrane-<wbr></wbr>impermeable calcium chelator that binds extracellular calcium ions (K<sub>d</sub> = 0.11 μM), with selectivity over magnesium ions or protons. BAPTA and its derivatives can also be used as calcium indicators, since the absorption maximum for BAPTA changes when it is complexed with calcium (absorption maxima free/complexed = 254/274 nm, emission maxima free/complexed = 363/363 nm). BAPTA AM is a cell permeable analog of BAPTA that binds calcium only after the acetoxymethyl group is removed by cytoplasmic esterases. It is commonly used at 10-<wbr></wbr>100 μM to evaluate the role of intracellular calcium in cell signaling. It can also be used in animals. BAPTA AM also inhibits voltage-<wbr></wbr>gated potassium (K<sub>v</sub>) channels, including K<sub>v</sub>1.3, K<sub>v</sub>1.5, and K<sub>v</sub>11.1 (K<sub>i</sub> = 1.45, 1.23, and 1.30 μM, respectively).

Catalog Number R020566
CAS Number 126150-97-8
Molecular Formula


Purity 95%
Storage -20°C

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