Rhodamine 123 is a popular green fluorescent mitochondrial dye that stains mitochondria in living cells in a membrane potential-dependent fashion. It is widely used in flow cytometry studies involving mitochondrial membrane potential. Please also see Dihydrorhodamine 123 and its HCl salt (10055 and 10056).
λEx/λEm(MeOH) = 505/534 nm
ε (505 nm, MeOH) = 97,000
Orange red solid soluble in DMSO or DMF
Store at 4°C and protect from light, especially in solution