Flocculation of bacteria by depletion interactions due to rod-shaped cellulose nanocrystals

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DOIResolve DOI: http://doi.org/10.1016/j.cej.2012.05.114
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TypeArticle
Journal titleChemical Engineering Journal
ISSN1385-8947
Volume198-199
Pages476481
SubjectFlocculation; Bacteria; Depletion; Cellulose nanocrystals
AbstractWe report depletion induced flocculation and phase separation of bacteria due to the presence of rod-shaped nanoparticles by using confocal laser microscopy and turbidity measurements. To investigate the depletion effect of rod shaped nanoparticles in bacteria systems, cellulose nanocrystals with length, L = 90 ± 10 nm, diameter, D = 8 ± 1 nm and zeta potential of 51.5 ± 0.8 mV was used. The flocculation of the Gram-negative bacterium Pseudomanas aeruginosa (average length = 1.2 μm, width = 0.2 μm) was tested. The zeta potential of P. aeruginosa suspended in 10 mM NaCl was −29.84 ± 0.6 mV. Bacterial flocculation was observed at the CNC concentration of less than 0.1% due to the depletion effect. We conclude from our results that rod shaped nanoparticles are very effective for the depletion flocculation of colloidal size bacteria and that phase separation of bacteria can occur at very low concentrations of rodlike CNC particles.
Publication date
LanguageEnglish
AffiliationSecurity and Disruptive Technologies; National Research Council Canada
Peer reviewedYes
IdentifierS1385894712007152
NPARC number21268690
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Record identifierace5983d-bfc0-4aba-984f-4bd046458b8d
Record created2013-11-07
Record modified2016-05-09
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