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• W2028438861 abstract "We report here our differential scanning calorimetry measurements investigating the thermotropic phase behaviour of binary dipalmitoylphosphatidylcholine (DPPC)/sterol mixtures containing two saturated sterols with different ring configurations (5β-H and either 3α-OH or 3β-OH). These measurements differ in the proportions of sharp and broad components in the heating endotherms, representing the melting of the sterol-poor and sterol-rich lipid micro-domains of the DPPC bilayer, respectively. Our results suggest that the 5,10-cis ring configuration of both saturated sterols and the ring A conformations have the greatest influence on DPPC bilayer properties, most likely by inducing small increases in the mean area/molecule as compared to cholesterol. However, the C3-OH orientation also influences sterol miscibility, likely due to variations in the strength and number of interfacial H-bonds with changes in molecular area, which in turn probably reflect the depth of the sterol in the DPPC bilayer. This influence of C3-OH orientation is significantly greater than was observed in our earlier study of cholesterol/- and epicholesterol/DPPC mixtures. Overall, our results show that both saturated and unsaturated 3α-ols are less miscible than the corresponding 3β-ols, but that the presence of a Δ(5) double bond can improve the sterol miscibility in the DPPC bilayer at high sterol concentrations." @default.
• W2028438861 created "2016-06-24" @default.
• W2028438861 creator A5004374190 @default.
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• W2028438861 date "2011-01-01" @default.
• W2028438861 modified "2023-09-25" @default.
• W2028438861 title "Sterol chemical configuration and conformation influence the thermotropic phase behaviour of dipalmitoylphosphatidylcholine mixtures containing 5β-cholestan-3β- and -3α-ol" @default.
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• W2028438861 doi "https://doi.org/10.1016/j.chemphyslip.2010.10.005" @default.
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