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Issue 35, 2020

Bacterial motility enhances adhesion to oil droplets

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Abstract

Adhesion of bacteria to liquid–liquid interfaces can play a role in the biodegradation of dispersed hydrocarbons and in biochemical and bioprocess engineering. Whereas thermodynamic factors underpinning adhesion are well studied, the role of bacterial activity on adhesion is less explored. Here, we show that bacterial motility enhances adhesion to surfactant-decorated oil droplets dispersed in artificial sea water. Motile Halomonas titanicae adhered to hexadecane droplets stabilized with dioctyl sodium sulfosuccinate (DOSS) more rapidly and at greater surface densities compared to nonmotile H. titanicae, whose flagellar motion was arrested through addition of a proton uncoupler. Increasing the concentration of DOSS reduced the surface density of both motile and nonmotile bacteria as a result of the reduced interfacial tension.

Graphical abstract: Bacterial motility enhances adhesion to oil droplets

Supplementary files

Article information


Submitted
20 May 2020
Accepted
07 Aug 2020
First published
07 Aug 2020

Soft Matter, 2020,16, 8237-8244
Article type
Paper

Bacterial motility enhances adhesion to oil droplets

N. K. Dewangan and J. C. Conrad, Soft Matter, 2020, 16, 8237 DOI: 10.1039/D0SM00944J

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