リン脂質のスメクチック液晶状態の界面化学的性質　（第１報）　ジミリストイルホスファチジルコリンの液晶二分子膜の定圧熱容量と高次相転移現象

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タイトル別名
  • Surface Chemical Properties of Smectic Liquid Crystal of Phospholipids. I. Specific Heat Capacity in High Order Phase Transition of Dimyristoylphosphatidylcholine Bilayers.
  • リン シシツ ノ スメクチック エキショウ ジョウタイ ノ カイメン カガクテ
  • Specific Heat Capacity in High Order Phase Transition of Dimyristoylphosphatidylcholine Bilayers
  • ジミリストイルポスファチジルコリンの液晶二分子膜の定圧熱容量と高次相転移現象

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Using a heat conduction calorimeter with very high resolution of 5×10-5 J/deg cm3, we measured specific heat capacity, CpL, between 25°C and 35°C of dimyristoylphosphatidylcholine (DMPC) in aqueous dispersions. Anomaly in CpL_, between 28.60°C and 29.50°C was noted; i.e., the curve for CpL against T first decreased and then exhibited an inflection point at 28.96°C before flattening. The inflection point at 28.96°C corresponded to the high order phase transition in DMPC bilayers that could occur through an intermediary phase.<BR>The dynamic properties of CpL indicated T* to be critical for the occurrence of high order transition of the bilayers. The time to reach equilibrium on changing temperature increased dramatically between 28.60°C and 28.96°C, increasing as (T-T) -1, but at T>T*, no dramatic “slowing-down” phenomenon was observed. This “slowing-down” near T* is a general characteristic of critical phenomena in high order transition. Thermodynamic parameters for high order bilayer transition were obtained fromCpLT data over this temperature interval. The value of 3.43 J/mol or 8.73 ×10-3 erg/cm2 of bilayer was found to be enthalpy change, in agreement with other data for interaction energy between neutral bilayers. A possible relationship of membrane bilayer stability with these newly identified dynamic properties of transition is discussed.

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  • 日本油化学会誌

    日本油化学会誌 45 (7), 647-653, 1996

    公益社団法人 日本油化学会

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