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https://www.readbyqxmd.com/read/29110458/simultaneous-rayleigh-mie-and-raman-fluorescence-characterization-of-molecularly-functionalized-colloids-by-correlative-single-particle-real-time-imaging-in-suspension
#1
Jörg Wissler, Martin Wehmeyer, Sandra Bäcker, Shirley K Knauer, Sebastian Schlücker
Many applications of nano- and microparticles require molecular functionalization. Assessing the heterogeneity of a colloidal sample in terms of its molecular functionalization is highly desirable, but not accessible by conventional ensemble experiments. Retrieving this information necessitates single-particle experiments which simultaneously detect both functionalized and non-functionalized particles via two separate imaging channels. In this contribution, we present an optical setup for performing correlative single-particle imaging using laser light-sheet illumination: the first detection channel records elastic light scattering (Rayleigh/Mie), while the second channel detects inelastic light scattering (Raman) or fluorescence...
November 7, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/29104980/determining-molecular-orientation-via-single-molecule-sers-in-a-plasmonic-nano-gap
#2
Addison R L Marshall, Jamie Stokes, Francesco N Viscomi, John E Proctor, Johannes Gierschner, Jean-Sebastien G Bouillard, Ali M Adawi
In this work, plasmonic nano-gaps consisting of a silver nanoparticle coupled to an extended silver film have been fully optimized for single molecule Surface-Enhanced Raman Scattering (SERS) spectroscopy. The SERS signal was found to be strongly dependent on the particle size and the molecule orientation with respect to the field inside the nano-gap. Using Finite Difference Time Domain (FDTD) simulations to complement the experimental measurements, the complex interplay between the excitation enhancement and the emission enhancement of the system as a function of particle size were highlighted...
November 16, 2017: Nanoscale
https://www.readbyqxmd.com/read/29055734/development-of-copolymeric-nanoparticles-of-hypocrellin-b-enhanced-phototoxic-effect-and-ocular-distribution
#3
Venkateshwaran Krishnaswami, Chandrasekar Ponnusamy, Senthilkumar Sankareswaran, Muthuselvam Paulsamy, Madi Madiyalakan, Rajaguru Palanisamy, Ruckmani Kandasamy, Subramanian Natesan
In the present work, we have developed a photosensitizer hypocrellin B (HB) and nano silver loaded PLGA-TPGS nanoparticles with improved singlet oxygen production for enhanced photodynamic effect for the efficient treatment of age related macular degeneration. Random copolymer (PLGA-TPGS) synthesized by ring opening and bulk polymerization was characterized by IR, (1)H NMR and TGA analysis. HBS-CP-NPs prepared by nanoprecipitation techniques were spherical shaped 89.6-753.6nm size particles with negative zeta potential...
October 18, 2017: European Journal of Pharmaceutical Sciences
https://www.readbyqxmd.com/read/29050591/benign-development-of-cotton-with-antibacterial-activity-and-metal-sorpability-through-introduction-amino-triazole-moieties-and-agnps-in-cotton-structure-pre-treated-with-periodate
#4
Amina L Mohamed, Ahmed G Hassabo, S Shaarawy, A Hebeish
The research work presented herein was undertaken with a view to develop, characterize and highlight modified cotton fabrics that acquire durable antibacterial activity in concomitant with high metal sorption capacity. The development is based on reacting cotton cellulose previously oxidized by sodium periodate-with 4 amino-1,2,4 triazole in presence and absence of silver nano particles (AgNPs). The idea behind the periodate pretreatment is to convert (via oxidative cleavge) the 2,3-vicinal diol of the anhydroglucose units of cotton into aldehyde groups...
December 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/29026613/a-case-of-generalized-argyria-presenting-with-muscle-weakness
#5
Inha Jung, Eun-Jeong Joo, Byung Seong Suh, Cheol-Bae Ham, Ji-Min Han, You-Gyung Kim, Joon-Sup Yeom, Ju-Yeon Choi, Ji-Hye Park
BACKGROUND: Argyria is a rare irreversible cutaneous pigmentation disorder caused by prolonged exposure to silver. Herein, we report a case of generalized argyria that developed after chronic ingestion of soluble silver-nano particles and presented with muscle weakness. CASE PRESENTATION: A 74-year-old woman visited our emergency room, complaining of fever and mental deterioration. She was diagnosed with acute pyelonephritis and recovered after antibiotic therapy...
2017: Annals of Occupational and Environmental Medicine
https://www.readbyqxmd.com/read/28980932/estimating-the-modulatory-effect-of-cadmium-chloride-on-the-genotoxicity-and-mutagenicity-of-silver-nanoparticles-in-mice
#6
H R H Mohamed
Silver (Ag) nanoparticles (nano-Ag) are widely used because of their distinctive antimicrobial properties, but this widespread use increases Ag release into the environment along with many other pollutants such as heavy metals. Therefore, this study was undertaken to study the modulatory effect of cadmium chloride (CdCl2) on the genotoxicity and mutagenicity of nano-Ag in mice liver, kidney and brain tissues. Co-injections of CdCl2 (1.5 mg/kg) with nano-Ag (20, 41, or 82 mg/kg) resulted in significant elevations in both single and double DNA strand breaks that triggered higher apoptotic DNA damage, as revealed by the more fragmented appearance of genomic DNA and the significant increase in apoptotic fractions...
September 30, 2017: Cellular and Molecular Biology
https://www.readbyqxmd.com/read/28963525/phyto-mediated-metallic-nano-architectures-via-melissa-officinalis-l-synthesis-characterization-and-biological-properties
#7
Irina Fierascu, Milen I Georgiev, Alina Ortan, Radu Claudiu Fierascu, Sorin Marius Avramescu, Daniela Ionescu, Anca Sutan, Alexandru Brinzan, Lia Mara Ditu
The development of methods for obtaining new materials with antimicrobial properties, based on green chemistry principles has been a target of research over the past few years. The present paper describes the phyto-mediated synthesis of metallic nano-architectures (gold and silver) via an ethanolic extract of Melissa officinalis L. (obtained by accelerated solvent extraction). Different analytic methods were applied for the evaluation of the extract composition, as well as for the characterization of the phyto-synthesized materials...
September 29, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28958187/nano-sized-zinc-oxide-and-silver-but-not-titanium-dioxide-induce-innate-and-adaptive-immunity-and-antiviral-response-in-differentiated-thp-1-cells
#8
Wing-Lam Poon, Harri Alenius, Joseph Ndika, Vittorio Fortino, Vesa Kolhinen, Arūnas Meščeriakovas, Mingfu Wang, Dario Greco, Anna Lähde, Jorma Jokiniemi, Jetty Chung-Yung Lee, Hani El-Nezami, Piia Karisola
Nano-sized metal oxides are currently the most manufactured nanomaterials (NMs), and are increasingly used in consumer products. Recent exposure data reveal a genuine potential for adverse health outcomes for a vast array of NMs, however the underlying mechanisms are not fully understood. To elucidate size-related molecular effects, differentiated THP-1 cells were exposed to nano-sized materials (n-TiO2, n-ZnO and n-Ag), or their bulk-sized (b-ZnO and b-TiO2) or ionic (i-Ag) counterparts, and genome-wide gene expression changes were studied at low-toxic concentrations (<15% cytotoxicity)...
September 29, 2017: Nanotoxicology
https://www.readbyqxmd.com/read/28929768/protein-corona-analysis-of-silver-nanoparticles-links-to-their-cellular-effects
#9
Sabine Juling, Alicia Niedzwiecka, Linda Böhmert, Dajana Lichtenstein, Sören Selve, Albert Braeuning, Andreas F Thünemann, Eberhard Krause, Alfonso Lampen
The breadth of applications of nanoparticles and the access to food-associated consumer products containing nanosized materials lead to oral human exposure to such particles. In biological fluids nanoparticles dynamically interact with biomolecules and form a protein corona. Knowledge about the protein corona is of great interest for understanding the molecular effects of particles as well as their fate inside the human body. We used a mass spectrometry-based toxicoproteomics approach to elucidate mechanisms of toxicity of silver nanoparticles and to comprehensively characterize the protein corona formed around silver nanoparticles in Caco-2 human intestinal epithelial cells...
October 6, 2017: Journal of Proteome Research
https://www.readbyqxmd.com/read/28922508/single-oxidative-collision-events-of-silver-nanoparticles-understanding-the-rate-determining-chemistry
#10
Kamonwad Ngamchuea, Richard O D Clark, Stanislav V Sokolov, Neil P Young, Christopher Batchelor-McAuley, Richard G Compton
The oxidative dissolution of citrate-capped silver nanoparticles (AgNPs, ∼50 nm diameter) is investigated herein by two electrochemical techniques: nano-impacts and anodic stripping voltammetry. Nano-impacts or single nanoparticle-electrode collisions allow the detection of individual nanoparticles. The technique offers an advantage over surface-immobilized methods such as anodic stripping voltammetry as it eliminates the effects of particle agglomeration/aggregation. The electrochemical studies are performed in different electrolytes (KNO3 , KCl, KBr and KI) at varied concentrations (≤20 mm)...
September 18, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28892895/effectivity-of-titanium-oxide-based-nano-particles-on-e-coli-from-clinical-samples
#11
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
#12
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 21, 2017: Nanoscale
https://www.readbyqxmd.com/read/28870753/synthesis-of-ag-fe2o3-nanocomposite-based-on-o-carboxymethylchitosan-with-antimicrobial-activity
#13
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
#14
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
#15
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-radio-frequency-co-sputtering-of-silver-nanocluster-silica-coatings-on-peek-bioactive-glass-layers-obtained-by-electrophoretic-deposition
#16
Muhammad Atiq Ur Rehman, Sara Ferraris, Wolfgang H 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 and 40 min); the resulting microstructure, composition, adhesion strength, in vitro bioactivity, and antibacterial activity were investigated...
September 27, 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
#17
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
#18
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
#19
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...
September 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
#20
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
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