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
中科院分区:
文献类型:
--
作者:
Smejtek,P;Wang,SR
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.
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影响因子:
3.4
作者:
P. Smejtek;M. Paulis
通讯作者:
M. Paulis
影响因子:
3.4
作者:
FLEWELLING, RF;HUBBELL, WL
通讯作者:
HUBBELL, WL
影响因子:
2.5
作者:
Donald L. Bott
通讯作者:
Donald L. Bott
影响因子:
3.4
作者:
R. Tsien;S. Hladky
通讯作者:
S. Hladky
影响因子:
3.4
作者:
P. Smejtek;K. Hsu;W. Perman
通讯作者:
W. Perman