To explore the photoinduced electron transfer in DPPC liposomes, the prepared samples of as a broad absorption band between 500 and 700 nm (see Figure ). Under oxidative conditions and upon photoirradiation, the formazan photoproduct Fz accumulates and obstructs the transient absorption measurements as it creates a bleach at the Fz absorption wavelength at 500 nm. The same artifact was also observed in the sample composition of NADH/[1] 2+ /XTT, making it challenging to evaluate the photo excited species in this composition. and XTT and also through the association of the anionic XTT with membrane-bound photosensitizer at the ground state (Figure ). As