Chowdhry B Z, Lipka G, Dalziel A W, Sturtevant J M
Biophys J. 1984 May;45(5):901-4. doi: 10.1016/S0006-3495(84)84236-8.
The phase transition properties of aqueous suspensions of a series of nonhydrated (not heated above room temperature) and hydrated 1,2 diacylphosphatidylethanolamines (PE's) have been examined by high sensitivity differential scanning calorimetry at scan rates of 0.02-1.0 K min-1. At all scan rates nonhydrated PE's show a single asymmetric transition curve of excess heat capacity as a function of temperature. Multilamellar dispersions of hydrated PE's, however, exhibit transitions with fine structure, which can be fitted as the sum of three two-state component transitions, at scan rates of 0.02-0.1 K min-1, but give only a single asymmetric transition at 1.0 K min-1. At all scan rates the transition(s) of hydrated samples occur at lower temperatures than those of nonhydrated samples. One of the component transitions of hydrated PE's may be analogous to the pretransition that occurs in 1,2 diacylphosphatidylcholines.
通过高灵敏度差示扫描量热法，以0.02 - 1.0 K min⁻¹的扫描速率，研究了一系列非水合（未加热至室温以上）和水合的1,2 - 二酰基磷脂酰乙醇胺（PE）水悬浮液的相变特性。在所有扫描速率下，非水合PE均呈现出一条单一的不对称过渡曲线，即过量热容随温度的变化曲线。然而，水合PE的多层分散体在0.02 - 0.1 K min⁻¹的扫描速率下，呈现出具有精细结构的转变，该转变可拟合为三个双态组分转变的总和，但在1.0 K min⁻¹时仅给出一个单一的不对称转变。在所有扫描速率下，水合样品的转变均发生在比非水合样品更低的温度下。水合PE的一个组分转变可能类似于1,2 - 二酰基磷脂酰胆碱中发生的预转变。
