Marsh D, Seddon J M
Biochim Biophys Acta. 1982 Aug 25;690(1):117-23. doi: 10.1016/0005-2736(82)90245-0.
The phase behaviour of distearoyl- and dihexadecylphosphatidylethanolamine at high salt concentration and of dipalmitoylphosphatidylcholine + 66 mol% palmitic acid at pH 4.0 have been studied by high-field 31P-NMR spectroscopy and X-ray diffraction. In saturated NaCl, dihexadecylphosphatidylethanolamine undergoes a reversible transition at 74 degrees C directly from the lamellar gel phase L beta to the inverted hexagonal HII phase. A similar transition is observed at 78.4 degrees C for distearoylphosphatidylethanolamine in saturated NaCl (cooling scan). The single, sharp calorimetric transition at 61 degrees C observed in dipalmitoylphosphatidylcholine + 66 mol% palmitic acid at pH 4.0 also corresponds to a transformation directly from the lamellar gel to the inverted hexagonal phase, without an intervening fluid lamellar phase.
通过高场31P - NMR光谱和X射线衍射研究了在高盐浓度下二硬脂酰磷脂酰乙醇胺和二棕榈酰磷脂酰乙醇胺以及在pH 4.0时二棕榈酰磷脂酰胆碱 + 66 mol% 棕榈酸的相行为。在饱和NaCl中，二棕榈酰磷脂酰乙醇胺在74℃时直接从层状凝胶相Lβ可逆转变为反相六角相HII。在饱和NaCl中，二硬脂酰磷脂酰乙醇胺在78.4℃时（冷却扫描）观察到类似的转变。在pH 4.0时，在二棕榈酰磷脂酰胆碱 + 66 mol% 棕榈酸中观察到的61℃处单一、尖锐的量热转变也对应于直接从层状凝胶相转变为反相六角相，没有中间的流体层状相。
