• USA Home
  • 196418 - BAPTA, Tetrasodium Salt

196418 Millipore

BAPTA, Tetrasodium Salt

Ca2+ chelator exhibiting a 105-fold greater affinity for Ca2+ .

Synonym: 1,2- bis( o-Aminophenoxy)ethane-N,N,Nʹ,Nʹ-tetraacetic Acid, 4Na, 1,2-bis(o-Aminophenoxy)ethane-N,N,Nʹ,Nʹ-tetraacetic Acid, 4Na, BAPTA, Tetrasodium Salt

  • CAS Number 126824-24-6

  • Empirical Formula (Hill Notation) C22H20N2O10 · 4Na

  • Molecular Weight 564.36

  •  MDL number MFCD00067691



Related Categories Calcium Signaling Research Tools, Cell Biology, Cell Signaling and Neuroscience, Intracellular Calcium Signaling, Metal binding chelators More...
Quality Level   100
form   solid
mfr. no.   Calbiochem®
storage condition   OK to freeze
  protect from light
storage conditions   -20C
color   off-white
solubility   water: 10 mg/mL
shipped in   ambient


General description

Ca2+-chelator exhibiting a 105-fold greater affinity for Ca2+ (110 nM) than for Mg2+. After BAPTA complexes with Ca2+, the UV spectrum shifts from 254 to 279 nm at pH >6.0. Useful for spectrophotometric monitoring of extracellular Ca2+ levels, especially transient phenomena, because of its insensitivity to pH. Has been used for the measurement and control of Ca2+ levels in eggs, chromaffin cells, muscle cells, retinal cells, and pancreatic cells. In conjunction with certain formazan dyes, BAPTA can be used in a colorimetric assay for Mg2+. Has neuroprotective effects in vitro against excitotoxic damage and spontaneous recurrent seizures, such as epilepsy.


1 g in Plastic ampoule


Toxicity: Irritant (B)


Following reconstitution, aliquot, purge with inert gas and freeze (-20°C). To increase stability in solution, store at a high pH (>10). Stock solutions are stable for up to 1 month at -20°C.

Other Notes

DeLorenzo, R.J., et al. 1998. Proc. Natl. Acad. Sci. USA 95, 14482.
Li, L., et al. 1995. J. Cell Physiol. 163, 105.
Tymianski, M., et al. 1994. J. Neurophysiol. 72, 1973.

Legal Information

CALBIOCHEM is a registered trademark of Merck KGaA, Darmstadt, Germany

Safety & Documentation

Safety Information

WGK Germany 
Flash Point(F) 
Not applicable
Flash Point(C) 
Not applicable
Protocols & Articles
Related Products

Technical Service:

Our team of scientists has experience in all areas of research including Life Science, Material Science, Chemical Synthesis, Chromatography, Analytical and many others.

Bulk Ordering & Pricing:

Need larger quantities for your development, manufacturing or research applications?