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Interactions between Phospholipid Monolayers (DPPC and DMPC) and Anesthetic Isoflurane Observed by Quartz Crystal Oscillator

¹ Department of Materials Science and Engineering, Nagoya Institute of Technology, Nagoya, Japan
² Department of Materials Science and Engineering, Nagoya Institute of Technology, Nagoya, Japan
³ Department of Materials Science and Engineering, Nagoya Institute of Technology, Nagoya, Japan
⁴ Department of Materials Science and Engineering, Nagoya Institute of Technology, Nagoya, Japan
⁵ Department of Materials Science and Engineering, Nagoya Institute of Technology, Nagoya, Japan
⁶ Department of Materials Science and Engineering, Nagoya Institute of Technology, Nagoya, Japan
⁷ Department of Materials Science and Engineering, Nagoya Institute of Technology, Nagoya, Japan
⁸ Department of Materials Science and Engineering, Nagoya Institute of Technology, Nagoya, Japan
⁹ Tohoku Foods Corporation Limited, Sendai, Japan
¹⁰ College of Arts and Sciences, Showa University, Fujiyoshida, Japan
¹¹ Department of Chemistry, Graduate School of Science, Tohoku University, Sendai, Japan

Journal of Biophysical Chemistry·Volume 06 (2015)·Pages 42–53·Published 31 March 2015·DOI10.4236/jbpc.2015.62005

Abstract

The interactions of phospholipid monolayers (dipalmitoyl phosphatidyl choline; DPPC and dimyristoyl phosphatidyl choline; DMPC) with volatile anesthetic isoflurane were investigated using quartz crystal microbalance (QCM) and quartz crystal impedance (QCI) methods. The quartz crystal oscillator was attached horizontally on the surface of DPPC and DMPC monolayer formed on the water surface. Physisorption of isoflurane hydrate at the DPPC monolayer surface was monitored in terms of frequency and resistance change of quartz crystal on addition of anesthetics isoflurane. Both frequency and resistance change showed the elastic nature of DPPC monolayer. Measurement of DMPC monolayer-isoflurane hydrate revealed the expandable nature of DMPC monolayer. Variation of frequency and impedance of DPPC and DMPC monolayer on addition of isoflurane which proved a two-step change has occurred at monolayer surface at isoflurane concentration of ≤8 mM that has been attributed to isoflurane aggregation at monolayer/water interface. Isoflurane hydrates formed in the process have capability to affect the interfacial properties of monolayer such as existence of structured water.

KeywordsPhysisorptionDPPC MonolayerDMPC MonolayerQuartz Crystal OscillatorAnesthetic Isoflurane-Monolayer Interaction

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Interactions between Phospholipid Monolayers (DPPC and DMPC) and Anesthetic Isoflurane Observed by Quartz Crystal Oscillator

Abstract

References (57)