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Stern–Volmer plots of quenching by catechin, naringenin and quercetin of the fluorescence of the DPH probe, located in the hydrophobic part of unilamellar liposomal DMPC vesicles. Liposomes (100 µg/mL, PBS, pH 7.4) were labeled with the DPH fluorescent probe at a final concentration of 1 µM, and then the flavonoids were added and incubated at 25 °C for 30 min. Fluorescence intensity values were registered in the absence (F0) and in the presence (F) of the flavonoids.
