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- W2068342382 abstract "Abstract Interactions of organic compounds with polar lipid monolayers have been widely studied and fall into two general categories: polar molecules (often electrically charged), which interact primarily with head groups, and non-polar molecules, which interact with tail groups. This study presents results for a typical odorant molecule, cyclohexanone, which is semipolar in the sense that the dipolar functional group (a carbonyl) is part of a small, non-polar hydrocarbon ring. Thermodynamic measurements on monolayers prepared from pure L-α- dipalmitoyllecithin (DPPC) reveal effects from cyclohexanone in the subphase on the ΔG for compression, which exhibits a maximum as a function of temperature, suggesting that interaction of the cyclohexane ring with hydrophobic tail groups dominates below 297 K, while interaction of the carbonyl function with head groups dominates above 297 K. Measurements of the surface dipole moment confirm this inference: when cyclohexanone is in the subphase the surface dipole moment is less than the value of μ for pure DPPC when the temperature is below 297 K. Above 297 K the surface dipole moment in the presence of cyclohexanone has a value greater than or equal to μ for pure DPPC. Variations in orientation of small molecules within lipid assemblies might conceivably contribute to membrane recognition of an odorant." @default.
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- W2068342382 date "1989-11-01" @default.
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- W2068342382 title "Small odorant molecules affect steady state properties of monolayers" @default.
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- W2068342382 doi "https://doi.org/10.1016/0040-6090(89)90048-5" @default.
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