[Heterogeneity of phospholipid membranes detected by the fluorescent probe method]

The measurements of fluorescence polarization index within the emission spectra of the fluorescent probes 4-dimethylaminochalcone (DMCh) and 3-methoxybenzantrone (MBA) have indicated that probes are distributed in liposomes prepared from synthetic dipalmitoyl lecithin (DPL) between binding sites of two types. By the method described in the present paper the spectra measured experimentally have been divided into two spectral components. The shape and position of this componential spectra were independent of the probe:lipid concentrations ratio.