Divalent Cation-Induced Phase Transition of Phosphatidylserine Monolayer at the Polarized Oil–Water Interface and Its Influence on the Ion-Transfer Processes

Divalent Cation-Induced Phase Transition of Phosphatidylserine Monolayer at the Polarized Oil–Water Interface and Its Influence on the Ion-Transfer Processes
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极化油水界面处二价阳离子诱导的磷脂酰丝氨酸单层相变及其对离子转移过程的影响

DOI:
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发表时间:
1990
期刊:
影响因子:
--
通讯作者:
M. Senda
M. Senda
中科院分区:
--
文献类型:
--
作者:
T. Kakiuchi;T. Kondo;M. Senda

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在精确控制界面电位降的情况下,通过测量界面的双层电容 Cdl,研究了极化硝基苯-水界面上二棕榈酰磷脂酰丝氨酸(DPPS)单层的相特性。当饱和的DPPS单层与0.1 mol dm−3 LiCl水溶液接触时,Cdl值为9.5 μF cm−2。水相中存在大于 2 mmol dm−3 的 Ca2+ 或 Mg2+ 会导致 Cdl 降低至 1.5 μF cm−2,对应于单层从液体膨胀相到凝聚相的相变。凝聚的 DPPS 单层对于 ΔOWφ=-0.14 和 0.10 V 之间界面上施加的电势的变化是稳定的,其中 ΔOWφ 是水相相对于硝基苯相的电势。离子转移的循环伏安测量表明,液体膨胀状态下的 DPPS 单层降低了 ClO4− 从水溶液到硝酸盐的转移速率。
The phase properties of dipalmitoylphosphatidylserine(DPPS) monolayer at a polarized nitrobenzene–water interface have been studied by measuring the double-layer capacitance of the interface, Cdl, under precise control of the potential drop across the interface. When a saturated DPPS monolayer was in contact with an aqueous 0.1 mol dm−3 LiCl solution, the Cdl took a value of 9.5 μF cm−2. The presence of Ca2+ or Mg2+ at greater than 2 mmol dm−3 in the aqueous phase induced a decrease in Cdl down to 1.5 μF cm−2, corresponding to the phase transition of the monolayer from a liquid-expanded to a condensed phase. The condensed DPPS monolayer was stable against a change in the applied potential across the interface between ΔOWφ=−0.14 and 0.10 V, where ΔOWφ is the potential of the aqueous phase with respect to that in the nitrobenzene phase. Cyclic voltammetric measurements of ion transfer showed that the DPPS monolayer in the liquid-expanded state decreased the rate of ClO4− transfer from the aqueous to the nit...
锂诱导磷脂酰丝氨酸双层的结晶。
DOI: --
发表时间: 1981
期刊: The Journal of biological chemistry
影响因子: --
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