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arXiv 2007.13502cond-mat.soft
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用座滴法测定相分离蛋白质和polymer液滴的表面张力

Surface tensiometry of phase separated protein and polymer droplets by the sessile drop method

Mahdiye Ijavi, Robert W. Style, Leonidas Emmanouilidis, Anil Kumar, Sandro M. Meier, Alexandre L. Torzynski, Frédéric H. T. Allain, Yves Barral, Michel O. Stein… 展开作者

Mahdiye Ijavi, Robert W. Style, Leonidas Emmanouilidis, Anil Kumar, Sandro M. Meier, Alexandre L. Torzynski, Frédéric H. T. Allain, Yves Barral, Michel O. Steinmetz, Eric R. Dufresne

摘要:

相分离的大分子在许多生物和合成系统中起着重要的作用。这些系统的物理表征可能是具有挑战性的,因为有限的样品体积,特别是对于相分离的蛋白质。在这里,我们证明了一个经典的方法,用于测量液滴的表面张力,基于一个固着液滴的形状的分析,可以有效地缩小这个应用程序。液滴形状和表面张力之间的联系依赖于液滴与其周围环境之间的密度差。这可以通过测量液滴沉降速度在相同设置中用小样品体积来确定。ESI中包含用于从液滴图像中提取毛细管长度的交互式MATLAB脚本。

英文摘要:

Phase separated macromolecules play essential roles in many biological and synthetic systems. Physical characterization of these systems can be challenging because of limited sample volumes, particularly for phase-separated proteins. Here, we demonstrate that a classic method for measuring the surface tension of liquid droplets, based on the analysis of the shape of a sessile droplet, can be effectively scaled down for this application. The connection between droplet shape and surface tension relies on the density difference between the droplet and its surroundings. This can be determined with small sample volumes in the same setup by measuring the droplet sedimentation velocity. An interactive MATLAB script for extracting the capillary length from a droplet image is included in the ESI.

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