Calorimetric studies of the effect of cis-carotenoids on the thermotropic phase behavior of phosphatidylcholine bilayers |
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| Authors: | Justyna Widomska, Anna Kostecka-Guga&#x a, Dariusz Latowski, Wies&#x aw I. Gruszecki,Kazimierz Strza&#x ka |
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| Affiliation: | aDepartment of Plant Physiology and Biochemistry, Faculty of Biochemistry, Biophysics and Biotechnology, Jagiellonian University, Cracow 30-387, Poland;bBiochemistry Department, University of Agriculture, 31-425 Cracow, Poland;cDepartment of Biochemistry, Institute of Biology, Pedagogical University, 30-084 Cracow, Poland;dDepartment of Biophysics, Institute of Physics, Maria Curie-Skłodowska University, 20-031 Lublin, Poland |
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| Abstract: | Carotenoid geometry is a factor that determines their solubility and orientation in the lipid membrane as well as antioxidant capacities and bioavailability. The effects of the cis-isomers of carotenoids (zeaxanthin and β-carotene) on the thermotropic properties of lipid membranes formed with dimyristoylphosphatidylcholine (DMPC) and dipalmitoylphosphatidylcholine (DPPC) were investigated by means of differential scanning calorimetry. The results were compared with the effects caused by the all-trans-isomer. Both the trans and cis isomers of zeaxanthin shifted the main phase transition temperature to lower values and decreased the cooperativity of the phase transition. The effect of all-trans zeaxanthin on the physical properties of the lipid bilayers has been shown to strongly depend on the hydrocarbon chain length of the membrane. In the case of cis-zeaxanthin this relationship is weaker. |
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| Keywords: | Cis-isomers Carotenoids Zeaxanthin β -Carotene Lipid bilayer |
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