A Trace Amount of Surfactants Enables Diffusiophoretic Swimming of Bacteria
A Trace Amount of Surfactants Enables Diffusiophoretic Swimming of Bacteria
复制标题
微量表面活性剂使细菌能够扩散泳动
DOI：
10.1021/acsnano.0c07502
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发表时间：
2020
期刊：
影响因子：
17.1
通讯作者：
Shin, Sangwoo
中科院分区：
文献类型：
--
作者：
Doan, Viet Sang;Saingam, Prakit;Yan, Tao;Shin, Sangwoo
从出生到健康，表面活性剂在我们的生活中发挥着至关重要的作用。由于其重要性，它们对环境的影响是众所周知的。已被广泛研究的方面之一是它们对细菌的影响，特别是对其运动性的影响。在这里，我们发现了一种由表面活性剂触发的替代趋化策略——扩散电泳。我们证明，即使是微量的离子表面活性剂，低至单个 ppm 水平，也可以通过增加细胞的表面电荷来促进细菌扩散泳动。由于扩散电泳是由表面-溶质相互作用驱动的，因此无论细菌类型如何，都会观察到表面活性剂增强的扩散电泳。无论是革兰氏阳性菌还是阴性菌、有鞭毛的还是无鞭毛的，表面活性剂都能使自由悬浮的细菌快速迁移，这表明存在一种普遍被忽视的运动机制。我们还证明了表面活性剂增强的细菌扩散电泳对流动网络中生物膜快速形成的影响，表明了环境和生物医学的影响。
From birth to health, surfactants play an essential role in our lives. Due to the importance, their environmental impacts are well understood. One of the aspects that has been extensively studied is their impact on bacteria, particularly on their motility. Here, we uncover an alternate chemotactic strategy triggered by surfactants—diffusiophoresis. We show that even a trace amount of ionic surfactants, down to a single ppm level, can promote the bacterial diffusiophoresis by boosting the surface charge of the cells. Because diffusiophoresis is driven by the surface–solute interactions, surfactant-enhanced diffusiophoresis is observed regardless of the types of bacteria. Whether Gram-positive or -negative, flagellated or nonflagellated, the surfactants enable fast migration of freely suspended bacteria, suggesting a ubiquitous locomotion mechanism that has been largely overlooked. We also demonstrate the implication of surfactant-enhanced bacterial diffusiophoresis on the rapid formation of biofilms in flow networks, suggesting environmental and biomedical implications.