Inhibition of bacterial surface colonization by immobilized silver nanoparticles depends critically on the planktonic bacterial concentration

Journal of Colloid and Interface Science
Stacy M WirthRobert D Tilton

Abstract

Immobilization of antimicrobial silver nanoparticles (AgNPs) on surfaces has been proposed as a method to inhibit biofouling or as a possible route by which incidental releases of AgNPs may interfere with biofilms in the natural environment or in wastewater treatment. This study addresses the ability of planktonic Pseudomonas fluorescens bacteria to colonize surfaces with pre-adsorbed AgNPs. The ability of the AgNP-coated surfaces to inhibit colonization was controlled by the dissolved silver in the system, with a strong dependence on the initial planktonic cell concentration in the suspension, i.e., a strong inoculum effect. This dependence was attributed to a decrease in dissolved silver ion bioavailability and toxicity caused by its binding to cells and/or cell byproducts. Therefore, when the initial cell concentration was high (∼1×10(7)CFU/mL), an excess of silver binding capacity removed most of the free silver and allowed both planktonic growth and surface colonization directly on the AgNP-coated surface. When the initial cell concentration was low (∼1×10(5)CFU/mL), 100% killing of the planktonic cell inoculum occurred and prevented colonization. When an intermediate initial inoculum concentration (∼1×10(6)CFU/mL) was suf...Continue Reading

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Citations

Nov 9, 2016·Journal of Colloid and Interface Science·Can-Hui DengHong-Yu Liu
Dec 21, 2016·Environmental Science & Technology·Alex J Bertuccio, Robert D Tilton
Jun 21, 2017·The Science of the Total Environment·Anastasia TsiolaManolis Tsapakis
Jan 28, 2021·European Journal of Oral Sciences·Maria Jacinta Rosario H Romero, Frank Lippert
May 11, 2020·Colloids and Surfaces. B, Biointerfaces·Markéta HůlkováBlahoslav Maršálek
Jul 6, 2021·JAC-antimicrobial Resistance·Jean-Yves MaillardRose Cooper
May 29, 2018·ACS Applied Materials & Interfaces·Chun Kiat YeoMary B Chan-Park
Apr 6, 2019·ACS Applied Materials & Interfaces·Sara Malekkhaiat HäffnerMartin Malmsten
Jun 27, 2020·ACS Applied Materials & Interfaces·Elisa Parra-OrtizMartin Malmsten

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