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EN
Biomembranes, which are the structural and functional basis of the cells of all living organisms, have been an extremely interesting research object for biology and chemistry scientists for years. The multitude of elements constituting the components of natural lipid membranes, however, is associated with interpretation difficulties regarding the nature of the processes taking place in them. A useful research object that is a model of bilamellar biosystems with a significantly simplified composition and at the same time retaining properties that can be a reference point in relation to natural membranes are lipid membranes in the form of one or several component liposomes. It is precisely such systems built of molecules of dipalmitoyl phosphatidylcholine (DPPC) or dipalmitoyl phosphatidylglycerol (DPPG), and analogous systems with the addition of cholesterol (Chol), that were the subject of research in this work. Near-infrared (NIR) vibrational spectroscopy provides a suitable method for the study of the hydrated samples. In most cases it can be alternatively adopted instead of commonly used mid-infrared (MIR) vibrational spectroscopy. This technique was applied for the first time to identify the spectral changes associated with the conformational changes in the hydrophobic region of model lipid bilayers. Trans/gauche isomerization of CH2 groups of lipid hydrocarbon chains is accompanied by characteristic changes in spectral parameters of both νas,s CH2 bands and their first overtones (2νas,s CH2). The heating of all types of analyzed liposomes results in main phase transition (Tm) accompanied by trans to gauche isomerization of CH2 groups of lipid hydrocarbon chains. The NIR-spectroscopy was able to describe in proper way (similar to MIR results) the character of Tm in studied bilayers.
PL
W ostatnich latach można zaobserwować wzrost liczby publikacji związanych z tematyką otrzymywania i charakteryzowania liposomów mających znaleźć lub znajdujących zastosowanie jako nośniki leków w terapiach nowotworów i stanów zapalnych. W celu zwiększania skuteczności nanopęcherzykowych nośników leków niezbędne jest dokładne poznanie ich struktury. Ponadto wprowadzanie modyfikacji do błony liposomu może uczynić je efektywniejszymi partnerami w selektywnym dostarczaniu leku, a przez to zmniejszyć szkodliwe działanie substancji aktywnej na zdrowe tkanki organizmu.
EN
In recent years, the growth in the number of publications about the preparation and characterization of liposomes which are to be used or are being tested as anticancer and anti-inflammatory drug nanocarriers has been widely reported. In order to develop more effective nanovesical drug carriers, their structures need to be scrutinized. Moreover, modifications of the liposomal phospholipid bilayer are supposed to make them more effective partners for selective drug delivery, and thus decrease a harmful impact of an active substance on healthy tissues.
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