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https://www.readbyqxmd.com/read/28822261/revelation-of-susceptibility-differences-due-to-hg-ii-accumulation-in-streptococcus-pyogenes-against-cx-agnps-and-cefixime-by-atomic-force-microscopy
#1
Wasia Rasheed, Muhammad Raza Shah, Samina Perveen, Shakil Ahmed, Sami Uzzaman
Solution based method for the formation of chemically modified silver nanoparticles (CX-AgNPs) using Cefixime as stabilizing and reducing agent was developed. The CX-AgNPs were characterized by AFM, UV-visible, FT-IR and MALDI-TOF MS. Bactericidal efficiency of CX-AgNPs and Cefixime against Streptococcus pyogenes was evaluated. Afterwards, susceptibility differences of Streptococcus pyogenes due to accumulation of Hg(II) against CX-AgNPs and Cefixime were estimated and validated through Atomic force microscopy...
August 16, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/28821110/unraveling-the-reaction-mechanism-of-silver-ions-reduction-by-chitosan-from-so-far-neglected-spectroscopic-features
#2
Ana Patrícia Carapeto, Ana Maria Ferraria, Ana Maria Botelho do Rego
Metallic silver nanoparticles were synthesized in aqueous solution using chitosan, as both reducing and stabilizing agent, and AgNO3 as silver precursor aiming the production of solid ultra-thin films. A systematic characterization of the resulting system as a function of the initial concentrations was performed. The combination of UV-vis absorption - and its quantitative analysis - with X-ray photoelectron spectra, light scattering measurements and atomic force microscopy allowed obtaining a rational picture of silver reduction mechanism through the identification of the nature of the formed reduced/oxidized species...
October 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28820974/a-fast-method-for-the-determination-of-lead-in-honey-samples-using-stabilizer-free-silver-nanoparticles
#3
Dayana Borges Bittar, Tiago Augusto Catelani, Leonardo Pezza, Helena Redigolo Pezza
A sensitive, rapid and robust method based on the use of stabilizer-free silver nanoparticles was developed for lead detection in honey. Silver nanoparticles were synthesized without the presence of any stabilizers using silver nitrate and sodium borohydride as precursors where the latter was applied as reducing agent. The optimization of the experimental variables (AgNO3 and NaBH4) for the formation of the nanoparticles was carried out using varying volumes of these solutions. Spectrophotometric measurements at 393nm showed a linear working range between 0...
August 12, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/28820482/in-situ-synthesis-of-silver-nanoparticles-on-the-polyelectrolyte-coated-sericin-pva-film-for-enhanced-antibacterial-application
#4
Rui Cai, Gang Tao, Huawei He, Pengchao Guo, Meirong Yang, Chaoxiang Ding, Hua Zuo, Lingyan Wang, Ping Zhao, Yejing Wang
To develop silk sericin (SS) as a potential antibacterial biomaterial, a novel composite of polyelectrolyte multilayers (PEMs) coated sericin/poly(vinyl alcohol) (SS/PVA) film modified with silver nanoparticles (AgNPs) has been developed using a layer-by-layer assembly technique and ultraviolet-assisted AgNPs synthesis method. Ag ions were enriched by PEMs via the electrostatic attraction between Ag ions and PEMs, and then reduced to AgNPs in situ with the assistance of ultraviolet irradiation. PEMs facilitated the high-density growth of AgNPs and protected the synthesized AgNPs due to the formation of a 3D matrix, and thus endowed SS/PVA film with highly effective and durable antibacterial activity...
August 18, 2017: Materials
https://www.readbyqxmd.com/read/28819149/single-step-generation-of-metal-plasma-polymer-multicore-shell-nanoparticles-from-the-gas-phase
#5
Pavel Solař, Oleksandr Polonskyi, Ansgar Olbricht, Alexander Hinz, Artem Shelemin, Ondřej Kylián, Andrei Choukourov, Franz Faupel, Hynek Biederman
Nanoparticles composed of multiple silver cores and a plasma polymer shell (multicore@shell) were prepared in a single step with a gas aggregation cluster source operating with Ar/hexamethyldisiloxane mixtures and optionally oxygen. The size distribution of the metal inclusions as well as the chemical composition and the thickness of the shells were found to be controlled by the composition of the working gas mixture. Shell matrices ranging from organosilicon plasma polymer to nearly stoichiometric SiO2 were obtained...
August 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28817767/understanding-how-acoustic-vibrations-modulate-the-optical-response-of-plasmonic-metal-nanoparticles
#6
Aftab Ahmed, Matthew Pelton, Jeffrey R Guest
Measurements of acoustic vibrations in nanoparticles provide a unique opportunity to study mechanical phenomena at nanometer length scales and picosecond time scales. Vibrations in noble-metal nanoparticles have attracted particular attention, because they couple to plasmon resonances in the nanoparticles, leading to strong modulation of optical absorption and scattering. There are three mechanisms that transduce the mechanical oscillations into changes in the plasmon resonance: (1) changes in the nanoparticle geometry, (2) changes in electron density due to changes in the nanoparticle volume, and (3) changes in the interband transition energies due to compression / expansion of the nanoparticle (deformation potential)...
August 17, 2017: ACS Nano
https://www.readbyqxmd.com/read/28817099/sintering-inhibition-of-silver-nanoparticle-films-via-agcl-nanocrystal-formation
#7
Thomas Öhlund, Magnus Hummelgård, Håkan Olin
Electrically conductive films are key components in most printed and flexible electronics applications. For the solution processing of conductive films, inks containing silver nanoparticles (AgNPs) remain important because of their relatively easy processing and generally low resistivity after a sintering procedure. Because the commonly used, moderate sintering temperatures of 150-300 °C are still too high for most low-cost flexible substrates, expanding the knowledge of surface-ink interactions that affect the sintering temperature is desirable...
August 17, 2017: Nanomaterials
https://www.readbyqxmd.com/read/28816315/a-highly-selective-and-sensitive-fluorescent-nanosensor-for-dopamine-based-on-formate-bridged-tb-iii-complex-and-silver-nanoparticles
#8
Huihui Li, Jin Shen, Rongwei Cui, Chongmei Sun, Yanyan Zhao, Xia Wu, Na Li, Bo Tang
Highly selective determination of dopamine (DA) over other catecholamines is an urgent need for the precise diagnosis and therapy of DA related diseases. Herein, a new formate-bridged Tb(iii)-complex and silver nanoparticles (AgNPs) enhanced fluorescent nanosensor was constructed. HCOO(-) acted as a co-ligand of Tb(iii) and also as a linker between the Tb(iii) complex and AgNPs and more readily combined with the primary amine of DA than with epinephrine (EP). The formate-bridged action strengthened AgNPs-based surface enhanced fluorescence of the Tb(3+)-DA complex and improved the selectivity towards DA...
August 17, 2017: Analyst
https://www.readbyqxmd.com/read/28816302/functional-nanonetwork-structured-polymers-and-carbons-with-silver-nanoparticle-yolks-for-antibacterial-application
#9
Yanhuan Lin, Kairong Xiong, Zhitao Lu, Shaohong Liu, Zhaojie Zhang, Yuheng Lu, Ruowen Fu, Dingcai Wu
Functional nanonetwork-structured polymers and carbons with silver nanoparticle yolks (∼20 nm) were successfully fabricated via hypercrosslinking chemistry. Benefiting from the hierarchical porous nanonetwork structure and high surface areas (up to 566 m(2) g(-1)), the as-prepared nanocomposites demonstrated superior long-term antibacterial performances (e.g., 6 days).
August 17, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28816042/rapid-and-reliable-detection-of-alkaline-phosphatase-by-a-hot-spots-amplification-strategy-based-on-well-controlled-assembly-on-single-nanoparticle
#10
Yi Zeng, Jia-Qiang Ren, Shaokai Wang, Jiaming Mai, Bing Qu, Yan Zhang, Ai-Guo Shen, Jiming Hu
The first appeal of clinical assay is always accurate and rapid. For alkaline phosphatase (ALP) monitoring in medical treatment, a rapid, reliable surface-enhanced Raman scattering (SERS) test kit is designed based on a "hot spots" amplification strategy. Consisting of alkyne-tagged Au nanoparticles (NPs), Ag+, and enzyme substrate, the packaged test kit can achieve one-step clinical assay of ALP in human serum within several minutes, while the operation is simple as it directly inputs the sample into the test kit...
August 17, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28815642/nox4-and-nrf2-mediated-oxidative-stress-induced-by-silver-nanoparticles-in-vascular-endothelial-cells
#11
Xia Sun, Yi Yang, Junpeng Shi, Chengcheng Wang, Zhenfeng Yu, Hongwu Zhang
It has been widely reported that silver nanoparticles (AgNPs) induce oxidative stress in various cell lines. However, the mechanism for this effect and its consequences for cellular signaling are poorly understood. In this study, human umbilical vein endothelial cells (HUVECs) were used to assess the toxicity and investigate the associated molecular mechanisms caused by exposure to AgNPs. We demonstrated that AgNP exposure significantly and dose-dependently decreased the cell viability, induced reactive oxygen species (ROS) generation and led to early apoptosis in HUVECs...
August 16, 2017: Journal of Applied Toxicology: JAT
https://www.readbyqxmd.com/read/28815281/quantitative-characterization-of-colloidal-assembly-of-graphene-oxide-silver-nanoparticle-hybrids-using-aerosol-differential-mobility-coupled-mass-analyses
#12
Thai Phuong Nguyen, Wei-Chang Chang, Yen-Chih Lai, Ta-Chih Hsiao, De-Hao Tsai
In this work, we develop an aerosol-based, time-resolved ion mobility-coupled mass characterization method to investigate colloidal assembly of graphene oxide (GO)-silver nanoparticle (AgNP) hybrid nanostructure on a quantitative basis. Transmission electron microscopy (TEM) and zeta potential (ZP) analysis were used to provide visual information and elemental-based particle size distributions, respectively. Results clearly show a successful controlled assembly of GO-AgNP by electrostatic-directed heterogeneous aggregation between GO and bovine serum albumin (BSA)-functionalized AgNP under an acidic environment...
August 16, 2017: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/28815280/overcoming-challenges-in-single-particle-inductively-coupled-plasma-mass-spectrometry-measurement-of-silver-nanoparticles
#13
Jingyu Liu, Karen E Murphy, Michael R Winchester, Vincent A Hackley
Single particle ICP-MS has evolved rapidly as a quantitative method for determining nanoparticle size and number concentration at environmentally relevant exposure levels. Central to the application of spICP-MS is a commonly used, but not rigorously validated, calibration approach based on the measured transport efficiency and the response of ionic standards. In this work, we present a comprehensive and systematic study of the accuracy, precision and robustness of spICP-MS using the rigorously characterized reference material (RM) 8017 (Polyvinylpyrrolidone Coated Nominal 75 nm Silver Nanoparticles), recently issued by the National Institute of Standards and Technology (NIST)...
August 16, 2017: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/28811584/nanopriming-technology-for-enhancing-germination-and-starch-metabolism-of-aged-rice-seeds-using-phytosynthesized-silver-nanoparticles
#14
Wuttipong Mahakham, Ajit K Sarmah, Santi Maensiri, Piyada Theerakulpisut
Application of nanomaterials for agriculture is relatively new as compared to their use in biomedical and industrial sectors. In order to promote sustainable nanoagriculture, biocompatible silver nanoparticles (AgNPs) have been synthesized through green route using kaffir lime leaf extract for use as nanopriming agent for enhancing seed germination of rice aged seeds. Results of various characterization techniques showed the successful formation of AgNPs which were capped with phytochemicals present in the plant extract...
August 15, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28810193/kinetics-and-mechanism-of-antibacterial-activity-and-cytotoxicity-of-ag-rgo-nanocomposite
#15
Marjan Moghayedi, Elaheh K Goharshadi, Kiarash Ghazvini, Hossein Ahmadzadeh, Laleh Ranjbaran, Raheleh Masoudi, Ralf Ludwig
Nowadays, nanomaterials with remarkable antibacterial activity and low cytotoxicity attract much interest in research. By considering the antibacterial activity of Ag and graphene oxide (GO), the Ag-RGO nanocomposite was prepared by a one-pot and facile technique and it was used to evaluate its antibacterial activity and cytotoxicity against Escherichia coli and glioblastoma cancer cells (U87MG), respectively. The antibacterial activity was studied by micro-dilution and colony counting methods to investigate cell viability...
August 4, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28808381/characterization-antibacterial-and-antioxidant-properties-of-silver-nanoparticles-synthesized-from-aqueous-extracts-of-allium-sativum-zingiber-officinale-and-capsicum-frutescens
#16
Gloria Aderonke Otunola, Anthony Jide Afolayan, Emmanuel Olusegun Ajayi, Samuel Wale Odeyemi
BACKGROUND: Herbal drug delivery is limited by poor solubility and bioavailability which can be overcome with suitable nanomaterials that will enhance their pharmacokinetics and performance. OBJECTIVE: This study aimed to analyze the synthesis, characterization, and biological activities of silver nanoparticles (AgNPs) from three spices. MATERIALS AND METHODS: AgNPs were prepared using 0.1 M silver nitrate and aqueous extracts of Allium sativum L...
July 2017: Pharmacognosy Magazine
https://www.readbyqxmd.com/read/28806654/magnetic-separable-chitosan-microcapsules-decorated-with-silver-nanoparticles-for-catalytic-reduction-of-4-nitrophenol
#17
Peng Xu, Xuguang Liang, Nannan Chen, Jingen Tang, Wei Shao, Qinwei Gao, Zhaogang Teng
In the work, we have synthesized silver (Ag) nanoparticles deposited chitosan (CS) microcapsules with magnetic multiple Fe3O4 cores (denoted as Fe3O4/CS-Ag) as efficient catalysts for the reduction of 4-nitrophenol. The Fe3O4/CS-Ag catalysts are prepared by coating hydrophobic Fe3O4 nanoparticles with chitosan via a multiple emulsion-chemical crosslinking method and following in situ deposition of Ag nanoparticles onto the surfaces. The morphology and composition of the Fe3O4/CS-Ag microcapsules are characterized by Fourier transform infrared (FT-IR) spectra, scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX), and X-ray photoelectron spectroscopy...
August 5, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28806422/silver-nanoparticles-as-a-control-agent-against-facades-coated-by-aerial-algae-a-model-study-of-apatococcus-lobatus-green-algae
#18
Paulina Nowicka-Krawczyk, Joanna Żelazna-Wieczorek, Tomasz Koźlecki
Aerial algae are an important biological factor causing the biodegradation of building materials and facades. Conservation procedures aimed at the protection of historic and utility materials must be properly designed to avoid an increase of the degradation rate. The aim of the present study was to investigate the effect of silver nanoparticles (AgNP) synthetized with features contributing to the accessibility and toxicity (spherical shape, small size) on the most frequently occurring species of green algae in aerial biofilms and thus, the most common biodegradation factor-Apatococcus lobatus...
2017: PloS One
https://www.readbyqxmd.com/read/28806056/self-generation-of-reactive-oxygen-species-on-crystalline-agbio3-for-the-oxidative-remediation-of-organic-pollutants
#19
Jianyu Gong, Chung-Seop Lee, Eun-Ju Kim, Jae-Hwan Kim, Woojin Lee, Yoon-Seok Chang
In this study, we synthesized a novel perovskite nanomaterial consisting of AgBiO3 nanoparticles (NPs) via an ion-exchange method for remediation of polluted environments. The AgBiO3 NPs could self-produce significant amounts of reactive oxygen species (ROS) without light illumination or any other additional oxidant due to the controllable release of lattice oxygen from the crystalline AgBiO3, resulting in the formation of ROS somehow. The self-produced (1)O2, O2(•-), and (•)OH were confirmed by electron spin resonance spectroscopy using a spin trap technique...
August 18, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28806052/one-step-nanoscale-electrohydrodynamic-inkjet-three-dimensional-printing-technique-with-spontaneous-joule-heating
#20
Bin Zhang, Baekhoon Seong, Jaehyun Lee, VuDat Nguyen, DaeHyun Cho, Doyoung Byun
A one-step nanoscale electrohydrodynamic (EHD) inkjet three-dimensional (3D)-printing technique that is based on the drop-on-demand (DOD) operation for which an additional post-sintering process is not required is proposed. Both the numerical simulation and the experimental observations proved that nanoscale Joule heating occurs at the interface between the charged silver nanoparticles (Ag-NPs) because of the high electrical contact resistance during the printing process; this is the reason why an additional post-sintering process is not required...
August 14, 2017: ACS Applied Materials & Interfaces
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