NP-EGTA - 510 006

1 mg o-nitrophenyl EGTA tetrapotassium salt dissolved in 50 µl H₂O (= 30.5 mM). HPLC analysis
Spin down and store at -20° C. Protect material from light always.

C₂₀H₂₃K₄N₃O₁₂. chemical structure

ε = 5.52 x 10³ M^-1 x cm^-1 at 260 nm in Ca²⁺ free 40 mM HEPES / 100 mM KCl buffer at pH 7.2.