In-situ detection based on the biofilm hydrophilicity for environmental biofilm formation.

Abstract:

:A biofilm has a unique structure composed of microorganisms, extracellular polymeric substances (EPSs), etc., and it is layered on a substrate in water. In material science, it is important to detect the biofilm formed on a surface to prevent biofouling. EPSs, the major component of the biofilm, mainly consist of polysaccharides, proteins, nucleic acids, and lipids. Because these biomolecules have a variety of hydrophilicities or hydrophobicities, the substrate covered with the biofilm shows different wettability from the initial state. To detect the biofilm formation, this study employed a liquid-squeezing-based wettability assessment method with a simple wettability index: the liquid-squeezed diameter of a smaller value indicates higher wettability. The method is based on the liquid-squeezing behaviour of a liquid that covers sample surfaces when an air-jet is applied. To form the biofilm, polystyrene surfaces were immersed and incubated in a water-circulated bioreactor that had collected microorganisms in ambient air. After the 14-d incubation, good formation of the biofilm on the surfaces was confirmed by staining with crystal violet. Although the contact angles of captive bubbles on the surfaces with the biofilm were unmeasurable, the liquid-squeezing method could distinguish between hydrophilic and hydrophobic initial surfaces with and without biofilm formation using the diameter of the liquid-squeezed area. The surface wettability is expected to be a promising property for in-situ detection of biofilm formation on a macroscopic scale.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Tanaka N,Kogo T,Hirai N,Ogawa A,Kanematsu H,Takahara J,Awazu A,Fujita N,Haruzono Y,Ichida S,Tanaka Y

doi

10.1038/s41598-019-44167-6

subject

Has Abstract

pub_date

2019-05-30 00:00:00

pages

8070

issue

1

issn

2045-2322

pii

10.1038/s41598-019-44167-6

journal_volume

9

pub_type

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