Purified mitochondria were analyzed for intactness by using JC-1 dye, which tests the electrochemical proton gradient (ΔΨM) of the inner mitochondrial membrane. The intact purified mitochondria (control) show aggregation of JC-1 dye, whose signal can be measured at Ex/Em = 530/590 nm. Treatment with antimycin C (100 µM), an inhibitor of the electron transport chain, dissipates the mitochondrial membrane potential resulting in reduced fluorescence signal.