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首页> 外文期刊>Journal of Fluids >Phase Separation Behavior and System Properties of Aqueous Two-Phase Systems with Polyethylene Glycol and Different Salts: Experiment and Correlation
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Phase Separation Behavior and System Properties of Aqueous Two-Phase Systems with Polyethylene Glycol and Different Salts: Experiment and Correlation

机译：聚乙二醇和不同盐分的水两相体系的相分离行为和系统性质：实验和相关性

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摘要

The phase separation behaviors of PEG1000/sodium citrate, PEG4000/sodium citrate, PEG1000/ammonium sulfate, and PEG4000/ammonium sulfate aqueous two-phase systems were investigated, respectively. There are two distinct situations for the phase separation rate in the investigated aqueous two-phase systems: one state is top-continuous phase with slow phase separation rate and strong bottom-continuous phase with fast phase separation rate and weak volume ratio dependence. The system properties such as density, viscosity, and interfacial tension between top and bottom phases which have effects on the phase separation rate of aqueous two-phase systems were measured. The property parameter differences between the two phases increased with increasing tie line length and then improved the phase separation rate. Moreover, a modified correlation equation including the phase separation rate, tie line length, and physical properties of the four aqueous two-phase systems has been proposed and successfully tested in the bottom-continuous phase, whose coefficients were estimated through regression analysis. The predicted results of PEG1000/sodium citrate aqueous two-phase systems were verified through the stationary phase retention in the cross-axis countercurrent chromatography.
机译：分别研究了PEG1000 /柠檬酸钠，PEG4000 /柠檬酸钠，PEG1000 /硫酸铵和PEG4000 /硫酸铵水两相体系的相分离行为。在研究的水相两相系统中，存在两种截然不同的相分离率情况：一种状态是顶部连续相，相分离速率慢，而底部连续相强，相分离速率快，体积比依赖性小。测量了对顶部和底部相之间的体系性质如密度，粘度和界面张力的影响，所述体系性质对水性两相体系的相分离速率有影响。随着连接线长度的增加，两相之间的特性参数差异增加，然后提高了相分离率。此外，提出了一种修正的相关方程，包括四个水相两相系统的相分离率，连接线长度和物理性质，并在底部连续相中成功进行了测试，其系数通过回归分析估算。通过在横轴逆流色谱中的固定相保留，验证了PEG1000 /柠檬酸钠水两相系统的预测结果。

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