Sodium ion indicator

SBFI AM is a membrane-permeant, fluorescent Na+ indicator dye. It is selective for Na+ over K+ with Kd values of 20 and 120 mM for these ions, respectively. [1]Increasing concentration of Na+ increases the ratio of excitation efficiency at 330-345 nm to that at 370-390 nm with emission collected at 450-550 nm. [1] Therefore, ratio fluorometry and imaging can be performed with the same wavelengths. SBF AM is suitable for single intracellular dye injection and is typically used for high-resolution measurements of Na+ concentration in intact tissue through two-photon confocal imaging.[2]

ING-2 AM is a membrane-permeable fluorescent indicator specifically designed for sodium ions (Na+), exhibiting a binding affinity with a dissociation constant (Kd) of 20 mM. With excitation and emission maxima (λ) at 525 nm and 545 nm respectively, this compound achieves a 20-fold selectivity over potassium ions (K+). It is utilized both in vitro and in situ to monitor real-time sodium influx.

SBFI (tetraammonium), a sodium-sensitive fluorescence indicator and the tetraammonium salt of SBFI, operates effectively at an excitation wavelength of 333 nm and an emission wavelength of 539 nm [1].

SBFI is a membrane-permeant fluorescent Na+ indicator dye, excited at 340 nm with emission collected at 450 nm [1]. It selectively indicates Na+ over K+ with Kd values of 20 mM and 120 mM for these ions, respectively [2].