Biogenic Silver for Disinfection of Water Contaminated with Viruses

Author:

De Gusseme Bart1,Sintubin Liesje1,Baert Leen2,Thibo Ellen1,Hennebel Tom1,Vermeulen Griet1,Uyttendaele Mieke2,Verstraete Willy1,Boon Nico1

Affiliation:

1. Department of Biochemical and Microbiological Technology, Laboratory of Microbial Ecology and Technology (LabMET), Ghent University, Coupure Links 653, B-9000 Ghent, Belgium

2. Department of Food Safety and Food Quality, Laboratory of Food Microbiology and Food Preservation, Ghent University, Coupure Links 653, B-9000 Ghent, Belgium

Abstract

ABSTRACT The presence of enteric viruses in drinking water is a potential health risk. Growing interest has arisen in nanometals for water disinfection, in particular the use of silver-based nanotechnology. In this study, Lactobacillus fermentum served as a reducing agent and bacterial carrier matrix for zerovalent silver nanoparticles, referred to as biogenic Ag 0 . The antiviral action of biogenic Ag 0 was examined in water spiked with an Enterobacter aerogenes -infecting bacteriophage (UZ1). Addition of 5.4 mg liter −1 biogenic Ag 0 caused a 4.0-log decrease of the phage after 1 h, whereas the use of chemically produced silver nanoparticles ( n Ag 0 ) showed no inactivation within the same time frame. A control experiment with 5.4 mg liter −1 ionic Ag + resulted in a similar inactivation after 5 h only. The antiviral properties of biogenic Ag 0 were also demonstrated on the murine norovirus 1 (MNV-1), a model organism for human noroviruses. Biogenic Ag 0 was applied to an electropositive cartridge filter (NanoCeram) to evaluate its capacity for continuous disinfection. Addition of 31.25 mg biogenic Ag 0 m −2 on the filter (135 mg biogenic Ag 0 kg −1 filter medium) caused a 3.8-log decline of the virus. In contrast, only a 1.5-log decrease could be obtained with the original filter. This is the first report to demonstrate the antiviral efficacy of extracellular biogenic Ag 0 and its promising opportunities for continuous water disinfection.

Publisher

American Society for Microbiology

Subject

Ecology,Applied Microbiology and Biotechnology,Food Science,Biotechnology

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