Interaction of cardiotonic drugs (strophantidine acetate, suphan, para-oxybenzoic acid) and ubiquinone with phospholipid bilayers has been studied. Exothermic effect of the reaction followed by an increase in microviscosity and hydrophobicity of the bilayer from cardiolipin, but by a decrease of the microviscosity of the bilayer from lecithin has been estimated. A correlation is observed between changes in the lecithin bilayer fluidity and the heat effect of the interaction at the initial period of time after mixing of reagents.
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