NUKLEONIKA 2013, 58(3):439-442



Dariusz Man1, Izabella Pisarek2, Micha³ Braczkowski3

1 Institute of Physics, Opole University, 48 Oleska Str., 45-052 Opole, Poland
2 Department of Land Protection, Opole University, 48 Oleska Str., 45-052 Opole, Poland
3 Division in Sosnowiec, Medical University of Silesia,
6 Wojska Polskiego Str., 41-200 Sosnowiec, Poland

In this paper the changes of membrane fluidity of liposome with additions of humic substances (humic and fulvic acids) were examined. Liposome were done by the sonication of lecithin EYL. Concentrations of humic substances in attitude to EYL varied between 0–10% of weight. The technique of electron spin resonance (ESR) were used for the examination followed by three spin probes with a variety placement of the membrane located. TEMPO probe melted in the hydrophobic membrane and in the aquatic solution which allowed to determine the spectroscopic partition parameter (F), indicating the changes that occur in water-lipid interphase. Probe 5-DOXYL placed directly under the heads of polar lipids and the order parameter measuring by the TII showed the changing of membrane fluidity at surface area. 16-DOXYL probe penetrated the middle of the lipid bilayer membrane and allowed to determine the rotational correlation time #tau# parameter, which gives us information about changing of the liquidity lipid bilayer. Studies showed that the tested humic substances significantly changed the membrane fluidity of liposome. The dynamics of this process depends on both: the fraction of humic substances and its quality and quantity as well as the placement area of the membrane.

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