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Документ Changes in cell membranes of white blood cells treated with a common food additive E407a(2021) Tkachenko, A. S.; Onishchenko, A.; Posokhov, Ye. O.; Roshal, Alexander; Myasoedov, Valeriy; Nakonechna, OksanaChanges are detected in the spectra of the fluorescent probe bound to rat WBCs treated with the solutions of E407a of various concentrations in comparison with the corresponding spectra of the probe incubated with the untreated leukocytes. The decrease in polarity and protondonor ability is observed in the lipid membranes of leukocytes in the region, where the probe locates.Документ Effects of semi-refined carrageenan (food additive E407a) on cell membranes of leukocytes assessed in vivo and in vitro(2021) Tkachenko, A. S.; Onishchenko, A.; Roshal, Alexander; Nakonechna, O.; Chumachenko, T.; Posokhov, Ye. O.No noticeable changes in the physico-chemical properties were observed in the lipid membranes of leukocytes in the region where the probes locate in response to oral intake of semi-refined carrageenan. Incubation of leukocytes with E407a solutions resulted in a decrease in polarity and proton-donor ability of leukocytes in the area of carbonyl groups of phospholipids and in the area of hydrocarbon chains of phospholipids near the polar region of the bilayer.Документ A study of enterocyte membranes during activation of apoptotic processes in chronic carrageenan-induced gastroenterocolitis(Medical Association of Zenica-Doboj Canton, 2018) Tkachenko, A. S.; Marakushyn, Dmytro; Kalashnyk, Iuliia; Korniyenko, Yevgen; Onishchenko, Anatolii; Gorbach, Tatyana; Nakonechna, Oksana; Posokhov, Ye. O.; Tsygankov, A. V.Aim. To investigate the lipid membranes of rat enterocytes in chronic carrageenan-induced gastroenterocolitis accompanied by the activation of apoptotic processes. Methods. Steady-state fluorescence spectroscopy: a study by fluorescent probes – by ortho-hydroxy derivatives of 2,5-diaryl-1,3-oxazole. Activity of apoptosis signal-regulating kinase 1 and poly (ADP-ribose) polymerase in small intestinal homogenates, blood serum levels of matrix metalloproteinase-2 and caspase-3 and the level of DNA fragmentation in small intestinal homogenates were determined. Results. Biochemical analysis revealed that an activation of apoptotic processes occurred in the intestinal epithelium of rats during chronic carrageenan-induced gastroenterocolitis. The fluorescence probes showed that activation of apoptotic processes in carrageenan-induced gastroenterocolitis was accompanied by changes in polar regions of rat enterocyte membranes, while no changes were revealed in more hydrophobic regions of the membranes. Conclusion. The increase in hydration of membranes was attributed to the activation of the apoptosis of enterocytes. It has been shown that a fluorescent probe (2-(2′-hydroxyphenyl)-5-phenyl-1,3-oxazole) can be used for the detection of apoptosis of enterocytes.