Water Hydrogen-Bonding Network Structure and Dynamics at Phospholipid Multibilayer Surface: Femtosecond Mid-IR Pump–Probe Spectroscopy
| Autor: | Bartosz Błasiak, Kyungwon Kwak, Joonhyung Lim, Minhaeng Cho, Achintya Kundu |
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| Rok vydání: | 2016 |
| Předmět: |
Phase transition
Spectrophotometry Infrared 010304 chemical physics Chemistry Hydrogen bond Lipid Bilayers Analytical chemistry Water Hydrogen Bonding Biological membrane 010402 general chemistry 01 natural sciences 0104 chemical sciences Membrane Chemical physics 0103 physical sciences Femtosecond Water environment General Materials Science Physical and Theoretical Chemistry Spectroscopy Lipid bilayer Phospholipids |
| Zdroj: | The Journal of Physical Chemistry Letters. 7:741-745 |
| ISSN: | 1948-7185 |
| DOI: | 10.1021/acs.jpclett.6b00022 |
| Popis: | The water hydrogen-bonding network at a lipid bilayer surface is crucial to understanding membrane structures and its functional activities. With a phospholipid multibilayer mimicking a biological membrane, we study the temperature dependence of water hydrogen-bonding structure, distribution, and dynamics at a lipid multibilayer surface using femtosecond mid-IR pump-probe spectroscopy. We observe two distinguished vibrational lifetime components. The fast component (0.6 ps) is associated with water interacting with a phosphate part, whereas the slow component (1.9 ps) is with bulk-like choline-associated water. With increasing temperature, the vibrational lifetime of phosphate-associated water remains constant though its relative fraction dramatically increases. The OD stretch vibrational lifetime of choline-bound water slows down in a sigmoidal fashion with respect to temperature, indicating a noticeable change of the water environment upon the phase transition. The water structure and dynamics are thus shown to be in quantitative correlation with the structural change of liquid multibilayer upon the gel-to-liquid crystal phase transition. |
| Databáze: | OpenAIRE |
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