MQAE (N-(Ethoxycarbonylmethyl)-6-methoxyquinolinium bromide) is an improved chloride indicator that has greater sensitivity to chloride (Ksv= 200M-1) than SPQ (Ksv=118 M-1) and higher fluorescence quantum yield. The ester group of MQAE may slowly hydrolyze inside cells, resulting in a change in its fluorescence response.
White solid soluble in water and DMSO
Store at 4°C and protect from light, especially in solution
λEx/λ Em= 350/460nm
ε (344 nm, H2O) = 2,800