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Morphological Behavior of DPPC-DMPC Two-dimensional Mixed Monolayer on Water Surface by Dropping Method

Author

Listed:
  • Yuta Watanabe

    (Nagoya Institute of Technology, Japan)

  • Daiki Uchida

    (Nagoya Institute of Technology, Japan)

  • Honoka Akatsuka

    (Nagoya Institute of Technology, Japan)

  • Akihiro Yoshino

    (Nagoya Institute of Technology, Japan)

  • Keijiro Taga

    (Nagoya Institute of Technology, Japan)

  • Yasushi Yamamoto

    (Nagoya Institute of Technology, Japan)

  • Zameer Shervani

    (Food & Energy Security Research & Product Center, Japan)

  • Masato Yamamoto

    (Showa University, Japan)

Abstract

We have investigated the morphology of dipalmitoyl phosphatidyl choline (DPPC)-dimyristoyl PC (DMPC) mixed monolayer formed on the water surface by the dropping method using surface tension measurement (STm), Brewster angle microscopy (BAM), and infrared external reflection spectroscopy (IERS). The limiting molecular area (A0) obtained by STm showed that the negative deviation at xDMPC =0.6 when DMPC was added to the DPPC monolayer. BAM images also showed that the condensed rigid monolayer at xDMPC 0.5. Moreover, IER spectra showed that the alkyl chains of both DPPC and DMPC molecules are in trans conformation in mixed monolayer at xDMPC =0.2 whereas gauche conformation existed at xDMPC = 0.8. Above findings have justified the transition of flexible gauche conformation alkyl chains of DMPC molecule into rigid trans conformation by the addition of DPPC molecule at xDMPC 0.6.

Suggested Citation

Handle: RePEc:epw:ejchem:v:3:y:2022:i:1:id:5079
DOI: 10.24018/ejchem.2022.3.1.79
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