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Tytuł:
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Photocatalytic inactivation of dual- and mono-species biofilms by immobilized TiO 2 .
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Autorzy:
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Pablos C; Department of Chemical and Environmental Technology, ESCET, Universidad Rey Juan Carlos, c/Tulipán s/n, 28933 Móstoles, Madrid, Spain. Electronic address: .
Govaert M; Department of Chemical Engineering, BioTeC+ Chemical and Biochemical Process Technology and Control, KU Leuven, Gebroeders De Smetstraat 1, B-9000 Gent, Belgium.
Angarano V; Department of Chemical Engineering, BioTeC+ Chemical and Biochemical Process Technology and Control, KU Leuven, Gebroeders De Smetstraat 1, B-9000 Gent, Belgium.
Smet C; Department of Chemical Engineering, BioTeC+ Chemical and Biochemical Process Technology and Control, KU Leuven, Gebroeders De Smetstraat 1, B-9000 Gent, Belgium.
Marugán J; Department of Chemical and Environmental Technology, ESCET, Universidad Rey Juan Carlos, c/Tulipán s/n, 28933 Móstoles, Madrid, Spain.
Van Impe JFM; Department of Chemical Engineering, BioTeC+ Chemical and Biochemical Process Technology and Control, KU Leuven, Gebroeders De Smetstraat 1, B-9000 Gent, Belgium. Electronic address: .
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Źródło:
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Journal of photochemistry and photobiology. B, Biology [J Photochem Photobiol B] 2021 Aug; Vol. 221, pp. 112253. Date of Electronic Publication: 2021 Jul 06.
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Typ publikacji:
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Journal Article
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Język:
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English
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Imprint Name(s):
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Original Publication: Lausanne : Elsevier Sequoia, 1987-
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MeSH Terms:
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Ultraviolet Rays*
Biofilms/*drug effects
Titanium/*chemistry
Biofilms/radiation effects ; Catalysis ; Listeria monocytogenes/physiology ; Nanotubes/chemistry ; Salmonella typhimurium/physiology ; Titanium/toxicity
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Contributed Indexing:
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Keywords: Biofilms; Immobilized TiO(2); Listeria; Photocatalysis; Salmonella; TiO(2) nanotubes
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Substance Nomenclature:
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15FIX9V2JP (titanium dioxide)
D1JT611TNE (Titanium)
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Entry Date(s):
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Date Created: 20210716 Date Completed: 20210826 Latest Revision: 20210826
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Update Code:
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20240105
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DOI:
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10.1016/j.jphotobiol.2021.112253
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PMID:
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34271411
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Biofilms formed by different bacterial species are likely to play key roles in photocatalytic resistance. This study aims to evaluate the efficacy of a photocatalytic immobilized nanotube system (TiO 2 -NT) (IS) and suspended nanoparticles (TiO 2 -NP) (SS) against mono- and dual-species biofilms developed by Gram-negative and Gram-positive strains. Two main factors were corroborated to significantly affect the biofilm resistance during photocatalytic inactivation, i.e., the biofilm-growth conditions and biofilm-forming surfaces. Gram-positive bacteria showed great photosensitivity when forming dual-species biofilms in comparison with the Gram-positive bacteria in single communities. When grown onto TiO 2 -NT (IS) surfaces for immobilized photocatalytic systems, mono- and dual-species biofilms did not exhibit differences in photocatalytic inactivation according to kinetic constant values (p > 0.05) but led to a reduction of ca. 3-4 log 10 . However, TiO 2 -NT (IS) surfaces did affect biofilm colonization as the growth of mono-species biofilms of Gram-negative and Gram-positive bacteria is significantly (p ≤ 0.05) favored compared to co-culturing; although, the photocatalytic inactivation rate did not show initial bacterial concentration dependence. The biofilm growth surface (which depends on the photocatalytic configuration) also favored resistance of mono-species biofilms of Gram-positive bacteria compared to that of Gram-negative in immobilized photocatalytic systems, but opposite behavior was confirmed with suspended TiO 2 (p ≤ 0.05). Successful efficacy of immobilized TiO 2 for inactivation of mono- and dual-species biofilms was accomplished, making it feasible to transfer this technology into real scenarios in water treatment and food processing.
(Copyright © 2021 The Authors. Published by Elsevier B.V. All rights reserved.)
