ION Biosciences IPG-4 TMA+ Salt

Yellow-green fluorescent, potassium (K+) indicator, membrane
 

impermeable. Higher K+ affinity than IPG-1 and IPG-2.
 

ION Potassium Green – 4 (IPG-4) is a yellow-green fluorescent, intracellular potassium (K+) indicator with Ex/Em: 525 nm/545 nm and a high-sensitivity to detect small changes in K+ concentration. IPG-4 has the highest affinity (Kd = 7 mM) among IPG analogues – IPG-2 (Kd = 18 mM) and IPG-1 (Kd = 50 mM).
 

IPG-4 TMA+ salt is a membrane impermeable form of IPG-4 that can be used in lipid membrane-free systems, in liposomes, or can be introduced into cells by electroporation, microinjection or other methods. IPG-4 has been successfully used as a sensor for extracellular K+.