Interaction of benzene with bilayers. Thermal and structural studies.

Interaction of benzene with bilayers. Thermal and structural studies.
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苯与双层的相互作用。

DOI:
10.1021/bi00260a031
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发表时间:
1982
期刊:
影响因子:
2.9
通讯作者:
Borovyagin,V
Borovyagin,V
中科院分区:
生物学3区
文献类型:
--
作者:
McDaniel,RV;Simon,SA;McIntosh,TJ;Borovyagin,V

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RV McDaniel,S. A. Simon,* T. J. McIntosh和V. Borovyagin* 摘要:饱和磷脂酰胆碱脂质体的热和结构性质被苯显著改变。加入苯后,脂质体首先溶胀,然后分散成小的多层囊泡。在20 ℃时,这些囊泡在双层的平面上含有条纹或波纹. DSPC-苯脂质体的热行为的主要变化发生在摩尔比为2:1和1:1附近。在2:1摩尔比时,主吸热峰下的面积Δ Hm基本上消失;然而,总吸收热Δ Hm近似等于对照的总吸收热Δ Hm。这是因为当苯的摩尔分数为0.12< x< 0.50时,苯使凝胶相的表观摩尔热容Cp增加到约1.2 kcal/(mol-deg)。我们解释热容量的增加是由于凝胶相中缺陷(或无序)浓度的增加。当苯的摩尔分数在0.5和0.9之间时,转变温度降低了20-30 ℃,
RV McDaniel, S. A. Simon,* T. J. McIntosh, and V. Borovyagin* abstract: The thermal and structural properties of saturated phosphatidylcholine liposomes are significantly altered by benzene. Upon the addition of benzene, the liposomes first swell and then disperse into small multilamellar vesicles. At 20 C these vesicles contain striations or ripples in the plane of the bilayer. Major changes in the thermal behavior of DSPC-benzene liposomes occur near mole ratios of 2: 1 and 1: 1. At a 2: 1 mole ratio, the area under the main endothermic peak, AHm, essentially disappears; however, the total heat absorbed, AH (, remainsapproximately equal to that of the control. This occurs because for benzene mole fractions 0.12< x< 0.50, benzene increases the apparentmolar heat ca-pacity, Cp, of the gel phase to about 1.2 kcal/(mol-deg). We interpret thisincrease in heat capacity to be due to an increase in the concentration of defects (or disorder) in the gel phase. At mole fractions of benzene between 0.5 and 0.9, the transition temperature decreases by 20-30 C, and broad, multiple
单相区域中脂质分散体的比热。
DOI: 10.1016/0005-2736(82)90584-3
发表时间: 1982
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苯与胶束和双层的相互作用
DOI: 10.1021/j100397a048
发表时间: 1982
期刊: The Journal of Physical Chemistry
影响因子: --
作者:
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