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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Effect of Silver Nanoparticles on Soil Denitrification Kinetics
TL;DR: In this paper, the effect of three different silver nanoparticles (35-60 nm, uncoated and coated with 0.3% polyvinylpyrrolidone) at various concentrations (1, 10, or 100 mg/L) on the microbial-facilitated soil denitrification process using native bacteria in a soil (Toccoa sandy loam) environment was observed through an isotherm study.
Journal ArticleDOI
Silver nanoparticle‐decorated multiwalled carbon nanotube/pramipexole nanocomposite: Synthesis, characterization and application as an antibacterial agent
Journal ArticleDOI
Most simple preparation of an inkjet printing of silver nanoparticles on fibrous membrane for water purification: Technological and commercial application
Sang Jin Lee,Dong Nyoung Heo,Min Heo,Mi Hee Noh,Donghyun Lee,Su A Park,Ji-Hoi Moon,Il Keun Kwon +7 more
TL;DR: In this paper, a new approach of antibacterial water-filter generation which utilized inkjet printing to deposit silver nanoparticles onto an electrospun polyurethane fibrous membrane was described.
Journal ArticleDOI
Potential ecotoxicological effects of antimicrobial surface coatings: a literature survey backed up by analysis of market reports
Merilin Rosenberg,Merilin Rosenberg,Krunoslav Ilić,Katre Juganson,Angela Ivask,Merja Ahonen,Ivana Vinković Vrček,Anne Kahru,Anne Kahru +8 more
TL;DR: It can be concluded that silver-based AMCs are by far the most studied and used coatings followed by those based on titanium, copper, zinc, chitosan and quaternary ammonium compounds, while biomedicine pointed to marine industry, construction industry (paints), food industry and textiles as the main fields of application of AMCs.
Journal ArticleDOI
Mechanism of light-dependent biosynthesis of silver nanoparticles mediated by cell extract of Neochloris oleoabundans.
Zeqing Bao,Christopher Q. Lan +1 more
TL;DR: While increasing sonication time increased the percentage of disrupted cells and efficiency of aqueous cell extraction, over-sonication reduced AgNPs production, indicating only photons of high energy levels among the photosynthetic active radiations are capable of exciting the electrons of chlorophylls to a state that is sufficient for Ag+ reduction.
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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