Comparison of methods for characterizing nonideal solute self-association by sedimentation equilibrium.

Comparison of methods for characterizing nonideal solute self-association by sedimentation equilibrium.
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通过沉降平衡表征非理想溶质自缔合的方法比较。

DOI:
10.1016/j.bpj.2009.05.028
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发表时间:
2009
影响因子:
3.4
通讯作者:
Scott DJ
Scott DJ
中科院分区:
生物学3区
文献类型:
--
作者:
Scott DJ

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我们详细研究了在非理想条件下描述自缔合的分析超晶格中沉降平衡表达式的解析解。我们发现,那些包含径向依赖的总溶质浓度,结合亚当斯-藤田假设的组成依赖性的活度系数揭示了潜在的缺点,表征这样的系统。在使用NONLIN软件时也存在类似的缺陷,该软件对单体和聚合物的活度系数之间的相互关系采用了相同的假设。这些困难可以克服迭代分析纳入表达式的组成依赖性的活度系数预测排除体积的考虑。因此,建议取代目前的软件包的程序,将严格的热力学非理想性沉淀平衡分布反映溶质自缔合的热力学机械津贴。
We have examined in detail analytical solutions of expressions for sedimentation equilibrium in the analytical ultracentrifuge to describe self-association under nonideal conditions. We find that those containing the radial dependence of total solute concentration that incorporate the Adams-Fujita assumption for composition-dependence of activity coefficients reveal potential shortcomings for characterizing such systems. Similar deficiencies are shown in the use of the NONLIN software incorporating the same assumption about the interrelationship between activity coefficients for monomer and polymer species. These difficulties can be overcome by iterative analyses incorporating expressions for the composition-dependence of activity coefficients predicted by excluded volume considerations. A recommendation is therefore made for the replacement of current software packages by programs that incorporate rigorous statistical-mechanical allowance for thermodynamic nonideality in sedimentation equilibrium distributions reflecting solute self-association.
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发表时间: 1973-01-01
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