Interaction between L-α-Phosphatidylcholine and Water Molecules. III

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  • ABE Masahiko
    Faculty of Science and Technology, Science University of Tokyo Institute of Colloid and Interface Science, Science University of Tokyo
  • GOTO Masaki
    Faculty of Science and Technology, Science University of Tokyo
  • OGINO Keizo
    Faculty of Science and Technology, Science University of Tokyo Institute of Colloid and Interface Science, Science University of Tokyo

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Other Title
  • 疎水鎖長の異なるホスファチジルコリンと水分子の相互作用 (第 3 報)
  • ソスイ サチョウ ノ コトナル ホスファチジルコリン ト ミズ ブンシ ノ ソ
  • The Structures of Interlamella Water and Membrane Microproperties
  • 層間水の構造と二分子膜の微視的性質

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The structural characteristics of water molecules on membrane microproperties of L-α-phosphatidylcholines were investigated by a fluorescence spectrometer. Polarity in the surroundings of the hydrophilic groups of L-α-phosphatidylcholine molecules in gel and concentric lamella phases, using a static fluorescence technique, considerably changed at a water content of about 20 wt%, and microviscosity decreased with increasing water content. Addition of urea to L-α-phosphatidylcholine-water systems changed the polarity and microviscosity in the surroundings of hydrophilic groups at a water content above 20 wt% probably due to change of structural characteristics of interlamella water. The present study suggests that the physicochemical microproperties of L-α-phosphatidylcholine bilayer are related to the structural characteristics of water molecules.

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