Electric Field-Induced Changes in Lipids Investigated by Modulated Excitation FTIR Spectroscopy
- Schwarzott, Michael
- Lasch, Peter
- Baurecht, Dieter
- Naumann, Dieter
- Fringeli, Urs Peter
DOIAbstract
AbstractThe effect of electric fields on dry oriented multibilayers of dimyristoylphosphatidylcholine (DMPC) was investigated by transmission Fourier transform infrared electric field modulated excitation (E-ME) spectroscopy. A periodic rectangular electric potential (0–150V, 1.25Hz, 28.4°C±0.2°C) was applied across the sample. To discriminate electric field-induced effects from possible temperature-induced effects resulting from a current flow (<1 pA) across the sample, corresponding temperature-modulated excitation (T-ME) measurements within the temperature uncertainty limits of ±0.2°C at 28.4°C were performed. T-ME induced reversible gauche defects in the hydrocarbon chains, whereas E-ME resulted in reversible compression of dry DMPC bil...
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