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https://www.readbyqxmd.com/read/28892895/effectivity-of-titanium-oxide-based-nano-particles-on-e-coli-from-clinical-samples
#1
Hima Bindu Mantravadi
INTRODUCTION: Nanoparticles composed of Titanium Oxide (TiO2) are non toxic, durable, stable and have a high refractive index with a lot of scope in biomedical applications. Due to their antibacterial effects, they can be applied to inanimate objects like glass, metal and even biomedical implants. AIM: This study was conducted to assess the antibacterial effect of Titanium Oxide (TiO2) alone or with Silver (Ag) as an additive on Escherichia coli. MATERIALS AND METHODS: Escherichia coli isolates (n=25) sensitive to most of the drugs including first generation cephalosporins, ampicillin and amoxycillin from various samples like pus, urine, sputum and blood were placed onto the glass slides containing TiO2 annealed at 200°C, 400°C, TiO2 with 0...
July 2017: Journal of Clinical and Diagnostic Research: JCDR
https://www.readbyqxmd.com/read/28876014/tracking-the-restructuring-of-oxidized-silver-indium-nanoparticles-under-a-reducing-atmosphere-by-environmental-hrtem
#2
Julien Ramade, Cyril Langlois, Michel Pellarin, Laurent Piccolo, Marie-Ange Lebeault, Thierry Epicier, Mimoun Aouine, Emmanuel Cottancin
Multimetallic nano-alloys display a structure and consequently physicochemical properties evolving in a reactive environment. Following and understanding this evolution is therefore crucial for future applications in gas sensing and heterogeneous catalysis. In view hereof, the structural evolution of oxidized Ag25In75 bimetallic nanoparticles under varying H2 partial pressures (PH2) and substrate temperatures (Ts) has been investigated in real-time through environmental transmission microscopy (E-TEM) while maintaining the atomic resolution...
September 6, 2017: Nanoscale
https://www.readbyqxmd.com/read/28870753/synthesis-of-ag-fe2o3-nanocomposite-based-on-o-carboxymethylchitosan-with-antimicrobial-activity
#3
Carla Albetina Demarchi, Alexandre Bella Cruz, Anna Ślawska-Waniewska, Natalia Nedelko, Piotr Dłużewski, Anna Kaleta, Jerzy Trzciński, Jacir Dal Magro, Jaqueline Scapinello, Clovis Antonio Rodrigues
In this paper, nano-hybrid particles of Ag@Fe2O3 based on O-carboxymethylchitosan were successfully synthesized using different reducing agents (NaBH4, sucrose) and without reducing agent. The smallest silver nanoparticles were those prepared without reducing agent (∼5±3nm). The average size of silver particles prepared with NaBH4 is around 5-15nm, and for samples prepared with sucrose, the average particle size is 10-25nm. The magnetization curves are roughly reversible, indicating that γ-Fe2O3 nanoparticles transit to a superparamagnetic state...
September 8, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28866213/multifunctional-biosynthesized-silver-nanoparticles-exhibiting-excellent-antimicrobial-potential-against-multi-drug-resistant-microbes-along-with-remarkable-anticancerous-properties
#4
Diksha Jha, Prasanna Kumar Thiruveedula, Rajiv Pathak, Bipul Kumar, Hemant K Gautam, Shrish Agnihotri, Ashwani Kumar Sharma, Pradeep Kumar
This study demonstrates the therapeutic potential of silver nanoparticles (AgNPs), which were biosynthesized using the extracts of Citrus maxima plant. Characterization through UV-Vis spectrophotometry, Dynamic Light Scattering (DLS), Fourier Transform Infrared spectroscopy (FTIR), X-ray Diffraction (XRD) and Transmission Electron Microscopy (TEM) confirmed the formation of AgNps in nano-size range. These nanoparticles exhibited enhanced antioxidative activity and showed commendable antimicrobial activity against wide range of microbes including multi-drug resistant bacteria that were later confirmed by TEM...
November 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28866209/the-application-of-silver-nano-particles-on-developing-potential-treatment-for-chronic-rhinosinusitis-antibacterial-action-and-cytotoxicity-effect-on-human-nasal-epithelial-cell-model
#5
Shyuan-Yow Chen, Min-Tsan Huang, Sylvia L F Pender, Muhammad Ruslin, Hsin-Hua Chou, Keng-Liang Ou
Chronic rhinosinusitis (CRS) has raised attentions both in many countries due to its high relapsing rate and the resistance of certain treatments especially antibiotics application on both acute and chronic bacterial rhinosinusitis. The aim of this research is stressing on developing an effective alternative treatment for treating CRS and reducing the use of antibiotics to avoid further resistance forming. The antibacterial functions of silver nano-particles (AgNPs) are well known according to previous reports and studies...
November 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28857546/antibacterial-and-bioactive-coatings-based-on-rf-co-sputtering-of-silver-nanocluster-silica-coatings-on-peek-bioactive-glass-layers-obtained-by-electrophoretic-deposition
#6
Muhammad Atiq Ur Rehman, Sara Ferraris, Wolfgang Goldmann, Sergio Perero, Fatih Erdem Bastan, Qaisar Nawaz, G Gautier di Confiengo, Monica Ferraris, Aldo R Boccaccini
Bioactive and antibacterial coatings on stainless steel substrates were developed and characterized in this study. Silver nanocluster-silica composite coatings of 60-150 nm thickness were deposited using radio frequency (RF) co-sputtering on PEEK/bioactive glass (BG) layers (of 80-90 µm thickness) which had been electrophoretically deposited onto stainless steel. Two sputtering conditions were used by varying the deposition time (15 min and 40 min); the resulting microstructure, composition, adhesion strength, in-vitro bioactivity and antibacterial activity were investigated...
August 31, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28832551/preparation-and-structural-analysis-of-nano-silver-loaded-poly-styrene-co-acrylic-acid-core-shell-nanospheres-with-defined-shape-and-composition
#7
Jin Zhang, Xiaoyu Zhao, Yanfei Wang, Liang Zhu, Libin Yang, Gang Li, Zuoliang Sha
A systematic study for the preparation and structural analysis of poly(styrene-co-acrylic acid) composite nanospheres (PSA) and silver nanoparticles loaded poly(styrene-co-acrylic acid) composite nanospheres (nAg@PSA) is reported. Poly(styrene-co-acrylic acid) nanospheres were synthesized by soap-free emulsion polymerization of styrene (St) and acrylic acid (AA) in water. Ag nanoparticles (Ag-NPs) were well-dispersed on the surfaces of poly(styrene-co-acrylic acid) composite nanospheres by in situ chemical reduction of AgNO₃ using NaBH₄ as a reducing agent in water...
August 23, 2017: Nanomaterials
https://www.readbyqxmd.com/read/28772987/preparation-of-superhydrophobic-film-on-ti-substrate-and-its-anticorrosion-property
#8
Min Zhu, Wenchuan Tang, Luyao Huang, Dawei Zhang, Cuiwei Du, Gaohong Yu, Ming Chen, Thee Chowwanonthapunya
Superhydrophobic films were fabricated on a titanium substrate with or without anodizing by using a self-assembling method. Firstly, the pretreatments of mechanical polishing/anodizing or mechanical polishing only were conducted, respectively. Subsequently, the preparation of polydopamine film layer, deposition of nano-silver particles, and post modification of 1H,1H,2H,2H-perfluorodecanethiol were performed on the surface of the pretreated substrate. The surface morphologies, compositions, wettability, and corrosion resistance of the films were investigated with scanning electron microscopy (SEM), energy-dispersive spectrometry (EDS), water contact angle measurements, and electrochemical tests, respectively...
June 8, 2017: Materials
https://www.readbyqxmd.com/read/28756157/degradation-of-anthropogenic-pollutant-and-organic-dyes-by-biosynthesized-silver-nano-catalyst-from-cicer-arietinum-leaves
#9
Geeta Arya, Nikita Sharma, Jahangir Ahmed, Nidhi Gupta, Ajeet Kumar, Ramesh Chandra, Surendra Nimesh
The work represents the potent catalytic activity of silver nanoparticles synthesized from Cicer arietinum (chickpea) leaf extract (CAL-AgNPs). Here, silver nano-catalysts were used against the anthropogenic pollutants mainly involving nitro-amines and azo dyes. These pollutants are extremely harmful to our environment and causes severe health issues. The CAL-AgNPs have the potential to degrade harmful toxins and their by-products, thereby decreasing the pollutants from the environment. The green synthesis of nano-catalyst includes a simple, cost effective and eco-friendly method using the leaf extract from the plant...
July 22, 2017: Journal of Photochemistry and Photobiology. B, Biology
https://www.readbyqxmd.com/read/28734568/antibacterial-properties-of-nano-silver-coated-peek-prepared-through-magnetron-sputtering
#10
Xiuju Liu, Kang Gan, Hong Liu, Xiaoqing Song, Tianjie Chen, Chenchen Liu
OBJECTVE: We aimed to investigate the cytotoxicity and antibacterial properties of nano-silver-coated polyetheretherketone (PEEK) produced through magnetron sputtering and provide a theoretical basis for its use in clinical applications. METHODS: The surfaces of PEEKs were coated with nano-silver at varying thicknesses (3, 6, 9, and 12nm) through magnetron sputtering technology. The resulting coated PEEK samples were classified into the following groups according to the thickness of the nano-silver coating: PEEK-3 (3nm), PEEK-6 (6nm), PEEK-9 (9nm), PEEK-12 (12nm), and PEEK control group...
July 19, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/28732869/in-situ-formation-of-supramolecular-aggregates-between-chitin-nanofibers-and-silver-nanoparticles
#11
Ruchira N Wijesena, Nadeeka D Tissera, Charith Abeyratne, Osura M Bangamuwa, Natalie Ludowyke, Damayanthi Dahanayake, Sunanda Gunasekara, Nuwan de Silva, Rohini M de Silva, K M Nalin de Silva
Chitin and chitin derivatives have gained significant research interest over the years due to a number of beneficial properties that can be exploited in various application fields. Particularly, interactions between their nanostructures and other nanomaterials are of great interest. In situ photo-reduction of AgCl in chitin nanofiber aqueous dispersions resulted in significant loss of colloidal stability of both chitin nanofibers (CNF) and silver nanoparticles. UV-vis spectroscopy was used to characterize the extinction profiles of in-situ prepared CNF and several silver nanoparticle mixtures over the reaction steps...
October 1, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28728033/deposition-pattern-and-tracer-particle-motion-of-evaporating-multi-component-sessile-droplets
#12
Muhammad Amjad, Yang Yang, Ghulam Raza, Hui Gao, Jun Zhang, Leping Zhou, Xiaoze Du, Dongsheng Wen
The understanding of near-wall motion, evaporation behavior and dry pattern of sessile nanofluid droplets is fundamental to a wide range of applications such as painting, spray drying, thin film coating, fuel injection and inkjet printing. However, a deep insight into the heat transfer, fluid flow, near-wall particle velocity and their effects on the resulting dry patterns is still much needed to take the full advantage of these nano-sized particles in the droplet. This work investigates the effect of direct absorptive silicon/silver (Si/Ag) hybrid nanofluids via two experiments...
November 15, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28723090/transformative-heterointerface-evolution-and-plasmonic-tuning-of-anisotropic-trimetallic-nanoparticles
#13
Mouhong Lin, Gyeong-Hwan Kim, Jae-Ho Kim, Jeong-Wook Oh, Jwa-Min Nam
Multicomponent nanoparticles that incorporate multiple nanocrystal domains into a single particle represent an important class of material with highly tailorable structures and properties. The controlled synthesis of multicomponent NPs with 3 or more components in the desired structure, particularly anisotropic structure, and property is, however, challenging. Here, we developed a polymer and galvanic replacement reaction-based transformative heterointerface evolution (THE) method to form and tune gold-copper-silver multimetallic anisotropic nanoparticles (MAPs) with well-defined configurations, including structural order, particle and junction geometry, giving rise to extraordinarily high tunability in the structural design, synthesis and optical property of trimetallic plasmonic nanoantenna structures...
July 25, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28715175/airborne-nanoparticle-release-and-toxicological-risk-from-metal-oxide-coated-textiles-toward-a-multiscale-safe-by-design-approach
#14
Paride Mantecca, Kaja Kasemets, Archana Deokar, Ilana Perelshtein, Aharon Gedanken, Yeon Kyoung Bahk, Baharh Kianfar, Jing Wang
Nano metal oxides have been proposed as alternatives to silver (Ag) nanoparticles (NPs) for antibacterial coatings. Here, cotton and polyester-cotton fabrics were sonochemically coated with zinc oxide (ZnO) and copper oxide (CuO) NPs. By varying the reaction solvent (water or ethanol), NPs with different sizes and shapes were synthesized. The cytotoxic and pro-inflammatory effects of studied NPs were investigated in vitro in human alveolar epithelial A549 and macrophage-like THP1 cells. To understand the potential respiratory impact of the NPs, the coated textiles were subjected to the abrasion tests, and the released airborne particles were measured...
July 28, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28709896/comparative-study-on-antifungal-activities-of-chitosan-nanoparticles-and-chitosan-silver-nano-composites-against-fusarium-oxysporum-species-complex
#15
S H S Dananjaya, W K C U Erandani, Cheol-Hee Kim, Chamilani Nikapitiya, Jehee Lee, Mahanama De Zoysa
Though the metal nanoparticles (NPs) have been shown favorable results against fungal diseases, erratic environmental toxicity of NPs have raised serious concerns against their applications. Hence, it is vital to modify antifungal compounds into safe substitutes over synthetic chemicals. In this study, antifungal effects of chitosan nanoparticles (CNPs) and chitosan silver nanocomposites (CAgNCs) were compared against Fusarium oxysporum species complex. CNPs and CAgNCs were synthesized, characterized and compared based on the transmission electron microscope, X-ray diffraction, UV-vis absorbance spectra, particle size distribution, zeta potential and thermal stability analysis...
July 11, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28627324/preparation-characterization-and-in-vitro-cytotoxicity-of-chitosan-hydrogels-containing-silver-nanoparticles
#16
Bożena Tyliszczak, Anna Drabczyk, Sonia Kudłacik-Kramarczyk, Agnieszka Sobczak-Kupiec
Hydrogels, chitosan as well as silver nanoparticles become in recent years materials characterized by a great interest. In present paper hydrogel based on chitosan and containing mentioned type of nano-sized particles have been synthesized by means of photopolymerization. Sorption capacity in selected liquids as well as behavior in simulated body fluid (such as Ringer's liquid) have been determined. Particularly attention was paid to the studies on toxicity of the hydrogels in relation to the epidermal cells as well as on their impact on growth of selected strain of bacteria (Escherichia coli)...
June 26, 2017: Journal of Biomaterials Science. Polymer Edition
https://www.readbyqxmd.com/read/28609256/nano-metal-oxides-exposure-and-engineering-control-assessment
#17
Alberto Garcia, Adrienne Eastlake, Jennifer L Topmiller, Christopher Sparks, Kenneth Martinez, Charles L Geraci
In January 2007, the National Institute for Occupational Safety and Health (NIOSH) conducted a field study to evaluate process specific emissions during the production of ENMs. This study was performed using the nanoparticle emission assessment technique (NEAT). During this study, it was determined that ENMs were released during production and cleaning of the process reactor. Airborne concentrations of silver, nickel, and iron were found both in the employee's personal breathing zone and area samples during reactor cleaning...
June 13, 2017: Journal of Occupational and Environmental Hygiene
https://www.readbyqxmd.com/read/28603966/silver-alginate-hydrogel-micro-and-nanocontainers-for-theranostics-synthesis-encapsulation-remote-release-and-detection
#18
Ekaterina Lengert, Mariia Saveleva, Anatolii Abalymov, Vsevolod Atkin, Pieter C Wuytens, Roman Kamyshinsky, Alexander L Vasiliev, Dmitry A Gorin, Gleb B Sukhorukov, Andre G Skirtach, Bogdan Parakhonskiy
We have designed multifunctional silver alginate hydrogel microcontainers referred to as loaded microcapsules with different sizes by assembling them via a template assisted approach using natural, highly porous calcium carbonate cores. Sodium alginate was immobilized into the pores of calcium carbonate particles of different sizes followed by cross-linking via addition of silver ions, which had a dual purpose: on one hand, the were used as a cross-linking agent, albeit in the monovalent form, while on the other hand they have led to formation of silver nanoparticles...
June 23, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28589745/green-synthesis-of-tea-ag-nanocomposite-hydrogels-via-mint-leaf-extraction-for-effective-antibacterial-activity
#19
Tippabattini Jayaramudu, Kokkarachedu Varaprasad, Gownolla Malegowd Raghavendra, E R Sadiku, Konduru Mohana Raju, John Amalraj
In this report, we investigated the swelling behavior and antibacterial property of nanosilver composite hydrogels made from tea with polyacrylamide via a free-radical polymerization and green process technique. This is probably for the first time; tea-based nano silver composite hydrogels were developed. The composite hydrogels comprise embedded nano silver particles in the tea hydrogel matrix via a green process with mint leaf extract. The size of the nano silver particles in the hydrogel matrix was found to be < 10 nm...
June 22, 2017: Journal of Biomaterials Science. Polymer Edition
https://www.readbyqxmd.com/read/28581710/biotransformation-of-silver-released-from-nanoparticle-coated-titanium-implants-revealed-in-regenerating-bone
#20
Hua Geng, Gowsihan Poologasundarampillai, Naomi Todd, Aine Devlin-Mullin, Katie L Moore, Zahra Golrokhi, James B Gilchrist, Eric Jones, Richard J Potter, Chris Sutcliffe, Marie O'Brien, David W L Hukins, Sarah Cartmell, Christopher A Mitchell, Peter D Lee
Antimicrobial silver nanoparticle coatings have attracted interest for reducing prosthetic joint infection. However, few studies report in vivo investigations of the biotransformation of silver nanoparticles within the regenerating tissue and its impact on bone formation. We present a longitudinal investigation of the osseointegration of silver nanoparticle-coated additive manufactured titanium implants in rat tibial defects. Correlative imaging at different time points using nanoscale secondary ion mass spectrometry, transmission electron microscopy (TEM), histomorphometry, and 3D X-ray microcomputed tomography provided quantitative insight from the nano- to macroscales...
June 16, 2017: ACS Applied Materials & Interfaces
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