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The Surface Enhanced Raman Spectroscopic Study of the Ordering of Lipid Molecules Deposited on the Silver Electrode

並列摘要


The surface-enhanced Raman scattering from dipalmitoylphosphatidylcholine (DPPC) lipid molecules adsorbed on the silver electrode has been studied. The voltage-dependent Raman intensity reached a maximum at -1.2 Vsce. It was found that the intensity ratio for the vibrational modes at 1105 cm- and 1142 cm^(-1) underwent a transition at an applied voltage beyond -1.05 Vsce. As the observed Raman modes correspond to the trans and gauche structures of the acyl chain in the lipid molecules, it is suggested that DPPC adsorbed on the silver electrode has an order-disorder phase transition induced by the change of the applied voltage. The relative intensities of the Raman modes of the DPPC adsorbed on the electrode and dispersed in water were also compared. The results are discussed in terms of the relative position adsorbed at the silver surface.

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