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Interactions of Silver Nanoparticles with Pseudomonas putida Biofilms

Fabrega, Julia and Renshaw, Joanna C and Lead, Jamie R (2009) Interactions of Silver Nanoparticles with Pseudomonas putida Biofilms. Environmental Science and Technology. ISSN 0013-936X

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URL of Published Version: http://pubs.acs.org/doi/abs/10.1021/es901706j

Identification Number/DOI: 10.1021/es901706j CCC

Silver nanoparticles (Ag NPs) may present a risk to the environment due to their expected toxicity and wide exposure. The interactions between Ag NPs and laboratory-grown Pseudomonas putida biofilms were investigated under a range of environmentally relevant conditions (pH 6 and 7.5; presence and absence of Suwannee River fulvic acid (SRFA)) over 4 days. In the absence of SRFA, there was extensive sloughing of the biofilm bacteria into suspension implying NP−bacterial interactions and potential effects on NP transport in the environment. In the presence of SRFA, sloughing of cells into suspension was reduced under some conditions and Ag NPs and their aggregates were observed and quantified on and in the bacterial cells in the biofilm. Viability of the cells in all cases appear unchanged by the presence of Ag NPs. Cell viability was independent of the concentration of NPs in solution, but sloughing rates varied substantially, sometimes in a dose-dependent manner. The results suggest that biofilms are impacted by Ag NPs when SRFA was not present, and that SRFA increases uptake and bioaccumulation of Ag NPs to biofilms, perhaps resulting in longer term effects, which need further investigation.

Type of Work:Article
Date:30 October 2009 (Publication)
School/Faculty:Colleges (2008 onwards) > College of Life & Environmental Sciences
Department:School of Geography, Earth and Environmental Sciences
Subjects:G Geography (General)
GE Environmental Sciences
Institution:University of Birmingham
Copyright Holders:American Chemical Society
ID Code:266
Refereed:YES
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