Adsorption to dipalmitoylphosphatidylcholine membranes in gel and fluid state: pentachlorophenolate, dipicrylamine, and tetraphenylborate.

Adsorption to dipalmitoylphosphatidylcholine membranes in gel and fluid state: pentachlorophenolate, dipicrylamine, and tetraphenylborate.
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凝胶和流体状态下对二棕榈酰磷脂酰胆碱膜的吸附:五氯酚盐、二辛胺和四苯硼酸盐。

DOI:
10.1016/s0006-3495(90)82468-1
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发表时间:
1990
影响因子:
3.4
通讯作者:
Wang,SR
Wang,SR
中科院分区:
生物学3区
文献类型:
--
作者:
Smejtek,P;Wang,SR

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我们测量了二棕榈酰磷脂酰胆碱(DPPC)囊泡的电泳迁移率的五氯苯酚(PCP),二苦胺(DPA),和四苯硼酸盐(TPhB)的负电荷离子的水溶液浓度的依赖性。目的是确定脂质的烃链的物理状态如何影响亲脂性离子的吸附。在25和42 ℃下进行研究,以分别确定凝胶和流体状态下DPPC膜的吸附性能。根据Langmuir-Stern-Grahame模型分析zeta-电位等温线,我们获得了缔合常数K、吸附位点面积Ps和线性分配系数β。结果如下:K,(x 10(4)M-1):K(凝胶):五氯苯酚(0.49 +/- 0.28),DPA(25 +/- 10),TPhB(31 +/- 10); K(液体):五氯苯酚(4.5 +/- 0.9),政治部(74 +/- 21),TPhB(59 +/- 14); Ps,(nm 2):Ps(凝胶):五氯苯酚(5.4 +/- 2.3),政治部(5.9 +/- 2),TPhB(5.0 +/- 1.7); Ps(液体):五氯苯酚(4.5 +/- 0.4),政治部(5.2 +/- 0.4),TPhB(4.1 +/- 0.2); β,(x 10(-5)m):β(凝胶):五氯苯酚(0.15 +/- 0.09),二苯丙醇胺(7.1 +/- 0.3),三苯代酚(10 +/- 7); β(液体):五氯苯酚(1.7 +/- 0.3),二苯丙醇胺(24 +/- 7),三苯代酚(24 +/- 6)。有趣的是,发现五氯苯酚,DPA,和TPhB的吸附位面积是非常相似的凝胶和流体膜,而且,该地区是独立的吸附物种的大小和分子结构。使用一个简单的离散电荷模型的吸附位点面积为所有物种是一致的,与8-10的介电常数和0.4-0.6 nm以下的水/电介质界面的离子吸附深度。发现五氯苯酚的Δ Δ G 0 = Δ G 0(凝胶)-Δ G 0(流体)约为DPA和TPhB的两倍。这表明,五氯苯酚将更多地吸附在生物膜的流体和无序区域,而DPA和TPhB的分布预计将相对更均匀。
We measured the dependence of electrophoretic mobility of dipalmitoylphosphatidylcholine (DPPC) vesicles on the aqueous concentration of negatively charged ions of pentachlorophenol (PCP), dipicrylamine (DPA), and tetraphenylborate (TPhB). The objective was to determine how the physical state of hydrocarbon chains of lipids affects adsorption of lipophilic ions. The studies were done at 25 and 42 degrees C to determine adsorption properties of DPPC membrane in the gel and fluid state, respectively. From the analysis of zeta-potential isotherms in terms of Langmuir-Stern-Grahame model we obtained the association constant, K, the area of the adsorption site, Ps, and the linear partition coefficient, beta. Results: K, (x 10(4)M-1): K(gel): PCP (0.49 +/- 0.28), DPA (25 +/- 10), TPhB (31 +/- 10); K(fluid): PCP (4.5 +/- 0.9), DPA (74 +/- 21), TPhB (59 +/- 14); Ps, (nm2): Ps(gel): PCP (5.4 +/- 2.3), DPA (5.9 +/- 2), TPhB (5.0 +/- 1.7); Ps(fluid): PCP (4.5 +/- 0.4), DPA (5.2 +/- 0.4), TPhB (4.1 +/- 0.2); beta, (x 10(-5) m): beta(gel): PCP (0.15 +/- 0.09), DPA (7.1 +/- 0.3), TPhB (10 +/- 7); beta(fluid): PCP (1.7 +/- 0.3), DPA (24 +/- 7), TPhB (24 +/- 6). It was interesting to find that the adsorption site area for PCP, DPA, and TPhB were very similar for both the gel and fluid membranes; also, the areas were independent of the size and molecular structure of the adsorbing species. Using a simple discrete charge model the adsorption site areas for all species were consistent with a dielectric constant of 8–10 and with an ion adsorption depth of 0.4–0.6 nm below the water/dielectric interface. The delta delta G0=delta G0(gel) - delta G0(fluid) was found to be about twice as large for PCP than for DPA and TPhB. This indicates that PCP will be significantly more adsorbed in the fluid and disordered regions of biomembranes, whereas the distribution of DPA and TPhB is expected to be relatively more even.
DOI: --
发表时间: 1979
影响因子: 3.4
作者:
P. Smejtek;M. Paulis
通讯作者: M. Paulis
DOI: 10.1016/s0006-3495(86)83664-5
发表时间: 1986-02-01
影响因子: 3.4
作者:
FLEWELLING, RF;HUBBELL, WL
通讯作者: HUBBELL, WL
物理科学的数据缩减和误差分析
DOI: 10.1080/00224065.1972.11980528
发表时间: 1972
影响因子: 2.5
作者:
Donald L. Bott
通讯作者: Donald L. Bott
膜内的离子排斥。
DOI: 10.1016/s0006-3495(82)84489-5
发表时间: 1982
影响因子: 3.4
作者:
R. Tsien;S. Hladky
通讯作者: S. Hladky
DOI: --
发表时间: 1976
影响因子: 3.4
作者:
P. Smejtek;K. Hsu;W. Perman
通讯作者: W. Perman