'Should I stay or should I go?' Bacterial attachment vs biofilm formation on surface-modified membranes

Title
'Should I stay or should I go?' Bacterial attachment vs biofilm formation on surface-modified membranes
Author(s)
이진태모세허저버그[모세허저버그]슬라브프레그[슬라브프레그]로이번스타인[로이번스타인]이진형김용규
Keywords
REVERSE-OSMOSIS MEMBRANES; PSEUDOMONAS-AERUGINOSA; GRAFT-POLYMERIZATION; QCM-D; ADHESION; CELL; DEPOSITION; PROTEIN; GROWTH; PERFORMANCE
Issue Date
201403
Publisher
TAYLOR & FRANCIS LTD
Citation
BIOFOULING, v.30, no.3, pp.367 - 376
Abstract
A number of techniques are used for testing the anti-biofouling activity of surfaces, yet the correlation between different results is often questionable. In this report, the correlation between initial bacterial deposition (fast tests, reported previously) and biofilm growth (much slower tests) was analyzed on a pristine and a surface-modified reverse osmosis membrane ESPA-1. The membrane was modified with grafted hydrophilic polymers bearing negatively charged, positively charged and zwitter-ionic moieties. Using three different bacterial strains it was found that there was no general correlation between the initial bacterial deposition rates and biofilm growth on surfaces, the reasons being different for each modified surface. For the negatively charged surface the slowest deposition due to the charge repulsion was eventually succeeded by the largest biofilm growth, probably due to secretion of extracellular polymeric substances (EPS) that mediated a strong attachment. For the positively charged surface, short-term charge attraction by quaternary amine groups led to the fastest deposition, but could be eventually overridden by their antimicrobial activity, resulting in non-consistent results where in some cases a lower biofilm formation rate was observed. The results indicate that initial deposition rates have to be used and interpreted with great care, when used for assessing the anti-biofouling activity of surfaces. However, for a weakly interacting 'low-fouling' zwitter-ionic surface, the positive correlation between initial cell deposition and biofilm growth, especially under flow, suggests that for this type of coating initial deposition tests may be fairly indicative of anti-biofouling potential.
URI
http://hdl.handle.net/YU.REPOSITORY/32979http://dx.doi.org/10.1080/08927014.2013.876011
ISSN
0892-7014
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공과대학 > 화학공학부 > Articles
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