Journal ArticleDOI
Negligible Particle-Specific Antibacterial Activity of Silver Nanoparticles
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TLDR
This work suggests that AgNP morphological properties known to affect antimicrobial activity are indirect effectors that primarily influence Ag(+) release, and antibacterial activity could be controlled by modulating Ag(+ release, possibly through manipulation of oxygen availability, particle size, shape, and/or type of coating.Abstract:
For nearly a decade, researchers have debated the mechanisms by which AgNPs exert toxicity to bacteria and other organisms. The most elusive question has been whether the AgNPs exert direct “particle-specific” effects beyond the known antimicrobial activity of released silver ions (Ag+). Here, we infer that Ag+ is the definitive molecular toxicant. We rule out direct particle-specific biological effects by showing the lack of toxicity of AgNPs when synthesized and tested under strictly anaerobic conditions that preclude Ag(0) oxidation and Ag+ release. Furthermore, we demonstrate that the toxicity of various AgNPs (PEG- or PVP- coated, of three different sizes each) accurately follows the dose–response pattern of E. coli exposed to Ag+ (added as AgNO3). Surprisingly, E. coli survival was stimulated by relatively low (sublethal) concentration of all tested AgNPs and AgNO3 (at 3–8 μg/L Ag+, or 12–31% of the minimum lethal concentration (MLC)), suggesting a hormetic response that would be counterproductive t...read more
Citations
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Journal ArticleDOI
Differential Microbicidal Effects of Bimetallic Iron-Copper Nanoparticles on Escherichia coli and MS2 Coliphage
Hyung-Eun Kim,Hye-Jin Lee,Min-Sik Kim,Taewan Kim,Hongshin Lee,Hak-Hyeon Kim,Min Cho,Seok Won Hong,Chang Ha Lee +8 more
TL;DR: It is suggested that E. coli is strongly influenced by the cytotoxicity of Cu(I), while MS2 is inactivated mainly due to the oxidative damages of protein capsid and RNA by Cu(III).
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Antimicrobial Activity of a Colloidal AgNP Suspension Demonstrated In Vitro against Monoculture Biofilms: Toward a Novel Tooth Disinfectant for Treating Dental Caries.
Donald R. Schwass,Karl Lyons,Robert M. Love,Geoffrey R. Tompkins,Carla J. Meledandri,Carla J. Meledandri +5 more
TL;DR: By preventing in vitro biofilm formation for several Streptococcus spp.
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Silver nanoparticle antibacterial efficacy and resistance development in key bacterial species
Journal ArticleDOI
Nanoantennas as Biomarkers for Bacterial Detection
TL;DR: It is demonstrated that a raspberry-shaped nanostructure with a high density of gold nanoparticles acts like an excellent antenna due to its optical properties, which permit sensitive detection and analysis of bacterial cells.
Journal ArticleDOI
Electroenhanced Antimicrobial Coating Based on Conjugated Polymers with Covalently Coupled Silver Nanoparticles Prevents Staphylococcus aureus Biofilm Formation.
TL;DR: It is concluded that this electroenhancement of the bactericidal effect of the coupled AgNPs offers a novel, efficient solution against biofilm colonization of medical implants.
References
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Journal ArticleDOI
The bactericidal effect of silver nanoparticles
Jose Ruben Morones,Jose Luis Elechiguerra,A. Camacho,Katherine B. Holt,Juan B. Kouri,Jose Tapia Ramirez,Miguel Jose Yacaman +6 more
TL;DR: The results indicate that the bactericidal properties of the nanoparticles are size dependent, since the only nanoparticles that present a direct interaction with the bacteria preferentially have a diameter of approximately 1-10 nm.
Journal ArticleDOI
Antimicrobial effects of silver nanoparticles
Jun Sung Kim,Eunye Kuk,Kyeong Nam Yu,Jong-Ho Kim,Sungjin Park,Hu Jang Lee,So Hyun Kim,Young Kyung Park,Yong Ho Park,Cheol Yong Hwang,Yong-Kwon Kim,Yoon-Sik Lee,Dae Hong Jeong,Myung-Haing Cho +13 more
TL;DR: The results suggest that Ag nanoparticles can be used as effective growth inhibitors in various microorganisms, making them applicable to diverse medical devices and antimicrobial control systems.
Journal ArticleDOI
Does the antibacterial activity of silver nanoparticles depend on the shape of the nanoparticle? A study of the Gram-negative bacterium Escherichia coli.
TL;DR: This is the first comparative study on the bactericidal properties of silver nanoparticles of different shapes, and the results demonstrate thatsilver nanoparticles undergo a shape-dependent interaction with the gram-negative organism E. coli.
Journal ArticleDOI
Cytotoxicity and Genotoxicity of Silver Nanoparticles in Human Cells
TL;DR: A possible mechanism of toxicity is proposed which involves disruption of the mitochondrial respiratory chain by Ag-np leading to production of ROS and interruption of ATP synthesis, which in turn cause DNA damage.
Journal ArticleDOI
Silver Colloid Nanoparticles: Synthesis, Characterization, and Their Antibacterial Activity
Aleš Panáček,Libor Kvítek,Robert Prucek,Milan Kolar,Renata Vecerova,N. Pizúrová,Virender K. Sharma,Tat’jana Nevečná,Radek Zboril +8 more
TL;DR: The reduction of [Ag(NH(3))(2)](+) by maltose produced silver particles with a narrow size distribution with an average size of 25 nm, which showed high antimicrobial and bactericidal activity against Gram-positive and Gram-negative bacteria, including highly multiresistant strains such as methicillin-resistant Staphylococcus aureus.
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