Charge-induced pretransition in phosphatidylethanolamine multilayers. The occurrence of ripple structures |
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Authors: | Jürgen StÜmpel Karl Harlos Hansj:Org Eibl |
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Affiliation: | Max-Planck-Institut für Biophysikalische Chemie, Ara Fassberg, D-3400 Göttingen F.R.G. |
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Abstract: | The influence of pli and ionic strength on the phase transition behaviour of 1,2-dihexadecylphosphatidylethanolamine was studied calorimetrically. In the range of ionic strength from 0.75 to 1.5 M NaC1 at , where the amino group of the phosphatidylethanolarnine is in the deprotonated state, resulting in one negative charge per lipid molecule, the calorimetric scan shows a pretransition before the main transition. Accompanying freeze-fracture electron microscopic studies on these preparations in the temperature range between the pre- and main transitions show a regular surface, the so-called ripple structure. These are comparable with the structures seen in phosphatidylcholine-water systems af temperatures between the pre- and main transition. |
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Keywords: | Ether-phosphatidylethanolamine Pretransition pH lonic strength Ripple structure Freeze fracture Phase transition 1,2-HH-G-PE 1,2-HH-G-PC phase transition temperature ΔH phase transition enthalpy |
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