Nonactivated titanium-dioxide nanoparticles promote the growth ofChlamydia trachomatisand decrease the antimicrobial activity of silver nanoparticles

2017 ◽  
Vol 123 (5) ◽  
pp. 1335-1345 ◽  
Author(s):  
A. Bogdanov ◽  
L. Janovák ◽  
I. Lantos ◽  
V. Endrész ◽  
D. Sebők ◽  
...  
Keyword(s):  
Antimicrobial Activity ◽  
Silver Nanoparticles ◽  
Titanium Dioxide ◽  
Titanium Dioxide Nanoparticles

scholarly journals Titanium Dioxide Nanoparticles Elicit Lower Direct Inhibitory Effect on Human Gut Microbiota Than Silver Nanoparticles

2019 ◽  
Vol 172 (2) ◽  
pp. 411-416 ◽  
Author(s):  
Richard T Agans ◽  
Alex Gordon ◽  
Saber Hussain ◽  
Oleg Paliy
Keyword(s):  
Silver Nanoparticles ◽  
Titanium Dioxide ◽  
Gut Microbiota ◽  
Titanium Dioxide Nanoparticles ◽  
Close Association ◽  
Community Diversity ◽  
Bacterial Cells ◽  
Human Gut ◽  
Human Gut Microbiota

Abstract Due to continued technological development, people increasingly come in contact with engineered nanomaterials (ENMs) that are now used in foods and many industrial applications. Many ENMs have historically been shown to possess antimicrobial properties, which has sparked concern for how dietary nanomaterials impact gastrointestinal health via microbial dysbiosis. We employed an in vitro Human Gut Simulator system to examine interactions of dietary nano titanium dioxide (TiO2) with human gut microbiota. Electron microscopy indicated a close association of TiO2 particles with bacterial cells. Addition of TiO2 to microbial communities led to a modest reduction in community density but had no impact on community diversity and evenness. In contrast, administration of known antimicrobial silver nanoparticles (NPs) in a control experiment resulted in a drastic reduction of population density. In both cases, communities recovered once the addition of nanomaterials was ceased. Constrained ordination analysis of community profiles revealed that simulated colonic region was the primary determinant of microbiota composition. Accordingly, predicted community functional capacity and measured production of short-chain fatty acids were not changed significantly upon microbiota exposure to TiO2. We conclude that tested TiO2 NPs have limited direct effect on human gut microbiota.

Impacts of titanium dioxide nanoparticles on transformation of silver nanoparticles in aquatic environments

2018 ◽  
Vol 5 (5) ◽  
pp. 1191-1199 ◽  
Author(s):  
Yinqing Zhang ◽  
Liwen Qiang ◽  
Yuting Yuan ◽  
Wei Wu ◽  
Binbin Sun ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Titanium Dioxide ◽  
Titanium Dioxide Nanoparticles ◽  
Aquatic Environments ◽  
Oxidative Dissolution ◽  
Sunlight Irradiation

Under sunlight irradiation, titanium dioxide nanoparticles could promote the oxidative dissolution of silver nanoparticles in aquatic environments.

Silver and Titanium Nanoparticles Used as Coating on Polyurethane Catheters

2017 ◽  
Vol 47 ◽  
pp. 17-23 ◽  
Author(s):  
S. Heilman ◽  
L.G.A. Silva
Keyword(s):  
Silver Nanoparticles ◽  
Titanium Dioxide ◽  
Inductively Coupled Plasma ◽  
Titanium Dioxide Nanoparticles ◽  
Sol Gel ◽  
Antimicrobial Properties ◽  
Optical Emission ◽  
Venous Catheter ◽  
Emission Spectrometry ◽  
Raman Spectrometry

Silver nanoparticles have been used in the medical area due to their remarkable antimicrobial properties. In this sense titanium dioxide nanoparticles obtained by the sol-gel method were used as coating of catheters for subsequent impregnation of silver nanoparticles with gamma irradiation and electron beam at 25 and 50 kGy. This work aimed to study the use of the silver nanoparticles and titanium dioxide as coating of polyurethane Central Venous Catheter (CVC) for antimicrobial activity. Furthermore the amounts of titanium and silver present in the coated catheters had been evaluated by Inductively Coupled Plasma – Optical Emission Spectrometry (ICP OES). Therefore the Raman spectrometry was used to identify the polymorph of titanium oxide, rutile.

scholarly journals Titanium dioxide/silver nanoparticle bilayers prepared in self-assembly processes

2016 ◽  
Vol 71 (1) ◽  
pp. 29
Author(s):  
Julia Maciejewska ◽  
Magdalena Oćwieja ◽  
Zbigniew Adamczyk ◽  
Elżbieta Bielańska ◽  
Bogna Napruszewska
Keyword(s):  
Silver Nanoparticles ◽  
Titanium Dioxide ◽  
Ionic Strength ◽  
Silver Nanoparticle ◽  
Self Assembly ◽  
Electrostatic Interactions ◽  
Titanium Dioxide Nanoparticles ◽  
Chemical Reduction ◽  
Supporting Layer ◽  
Phosphate Salts

<p>A new method for the preparation of TiO<sub>2</sub>/Ag bilayers via colloid <br /> self-assembly process using well-characterized titanium dioxide and silver suspensions was developed. The titanium dioxide nanoparticles, forming a supporting layer, were 46 nm in diameter, exhibiting an isoelectric point at pH 6.4. The silver nanoparticles, forming an external layer of the diameter of 50 nm were prepared via a chemical reduction method with the presence inorganic phosphate salts. The electrophoretic mobility measurements revealed that the zeta potential of silver nanoparticles was highly negative for a broad range of pH and ionic strengths. By explaining this information, the optimum condition for the silver nanoparticle immobilization on TiO<sub>2</sub> supporting layers were selected. The coverage of the first layer was adjusted by ionic strength of the suspensions and by the deposition time. Afterward, the silver nanoparticle monolayers of controlled coverage were deposited under the diffusion-controlled transport. Their coverage was determined by a direct enumeration of deposited nanoparticles from AFM images and SEM micrographs. The experimental results showed that for extended deposition times, the coverage of silver nanoparticle layers significantly increases with ionic strength. Therefore, it was proven that the formation of bilayers is mainly controlled by electrostatic interactions and that it is feasible to produce uniform TiO<sub>2</sub>/Ag materials of desired coverage and structure.</p>

scholarly journals The synthesis of silver, zinc oxide and titanium dioxide nanoparticles and their antimicrobial activity

2021 ◽  
Vol 2 (8) ◽  
pp. 479-489
Author(s):  
Kate Kotlhao ◽  
Moloko D.T. Madiseng ◽  
Fanyana M. Mtunzi . ◽  
Vusumzi E. Pakade . ◽  
Sekomeng J. Modise . ◽  
...  
Keyword(s):  
Antimicrobial Activity ◽  
Zinc Oxide ◽  
Titanium Dioxide ◽  
Titanium Dioxide Nanoparticles
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