BAPTA (85233-19-8) is a selective extracellular Ca2+ chelator. It is a widely used calcium sponge for chelating Ca2+ outside of intact cells.1 It’s a useful tool to probe the involvement of extracellular Ca2+ in cellular signaling.2,3 Non-cell-permeable.
1) Munoz et al. (2015), Different Stress-Induced Calcium Signatures Are Reported by Aequorin-Mediated Calcium Measurements in Living Cells of Aspergillus fumigatus; PLoS One, 10(9) e0138008
2) Wozniak et al. (2017), Extracellular Ca2+ is Required for Fertilization in the African Clawed Frog, Xenopus laevis; PLoS One, 12(1) e0170405
3) Didiasova et al. (2015), STIM1/ORAI1-mediated Ca2+ Influx Regulates Enolase-1 Exteriorization; J. Biol. Chem., 290 11983