keyword
MENU ▼
Read by QxMD icon Read
search

Colloidal silver

keyword
https://www.readbyqxmd.com/read/28646437/cytotoxic-and-genotoxic-effects-of-silver-nanoparticle-carboxymethyl-cellulose-on-allium-cepa
#1
Aline A Becaro, Maria Célia Siqueira, Fernanda C Puti, Marcia Regina de Moura, Daniel S Correa, José Manoel Marconcini, Luiz H C Mattoso, Marcos David Ferreira
Several mutagenic agents may be present in substances released in the environment, which may cause serious environmental impacts. Among these substances, there is a special concern regarding the widespread use of silver nanoparticles (AgNP) in several products due to their widely known bactericidal properties, including in the medical field and the food industry (e.g., active packaging). The assessment of the effects of AgNP released in the environment, having different concentrations, sizes, and being associated or not to other types of materials, including polymers, is therefore essential...
July 2017: Environmental Monitoring and Assessment
https://www.readbyqxmd.com/read/28646435/eco-friendly-synthesis-of-silver-nanoparticles-using-green-algae-caulerpa-serrulata-reaction-optimization-catalytic-and-antibacterial-activities
#2
Eman F Aboelfetoh, Rania A El-Shenody, Mohamed M Ghobara
Stable colloidal silver nanoparticles (AgNPs) were synthesized using Caulerpa serrulata (green marine algae) aqueous extract as an efficient reducing and stabilizing agent. This method is considered to be a sustainable alternate to the more complicated chemical procedures. To achieve the optimization synthesis of AgNPs, several effects such as extract concentration, contact time, pH values, and temperature were examined. The synthesized AgNPs were characterized by UV-Vis spectroscopy, FT-IR, XRD, and HR-TEM...
July 2017: Environmental Monitoring and Assessment
https://www.readbyqxmd.com/read/28634713/characterization-and-in-vitro-antibacterial-activity-of-saponin-conjugated-silver-nanoparticles-against-bacteria-that-cause-burn-wound-infection
#3
Anbarasan Muniyan, Kalaiselvi Ravi, Udayamathi Mohan, Rajasekar Panchamoorthy
Saponins are glycosides, which destabilize the membrane by altering the membrane permeability. Thus, the present study was aimed to fabricate the silver nanoparticles (AgNPs) using fenugreek derived saponin (SN) against multi-drug resistant bacteria. This study has optimized the concentration of SN (240 mg/mL) for the synthesis of an effective AgNPs against the test organism Escherichia coli. The SN reduced AgNPs produced a reddish-brown colour and displayed UV absorption at 416 nm. The bio-reducing efficiency of SN (62...
July 2017: World Journal of Microbiology & Biotechnology
https://www.readbyqxmd.com/read/28633660/a-re-assessment-of-the-safety-of-silver-in-household-water-treatment-rapid-systematic-review-of-mammalian-in-vivo-genotoxicity-studies
#4
REVIEW
Lorna Fewtrell, Batsirai Majuru, Paul R Hunter
BACKGROUND: Despite poor evidence of their effectiveness, colloidal silver and silver nanoparticles are increasingly being promoted for treating potentially contaminated drinking water in low income countries. Recently, however, concerns have been raised about the possible genotoxicity of particulate silver. OBJECTIVES: The goal of this paper was to review the published mammalian in vivo genotoxicity studies using silver micro and nanoparticles. METHODS: SCOPUS and Medline were searched using the following search string: ("DNA damage" OR genotox* OR Cytotox* OR Embryotox*) AND (silver OR AgNP)...
June 20, 2017: Environmental Health: a Global Access Science Source
https://www.readbyqxmd.com/read/28628747/laser-ablation-of-silver-in-liquid-organic-monomer-influence-of-experimental-parameters-on-the-synthesized-silver-nanoparticles-graphite-colloids
#5
Maxime Delmée, Gregory Mertz, Julien Bardon, Adeline Marguier, Lydie Ploux, Vincent Roucoules, David Ruch
During the last decade, synthesizing silver nanoparticles (Ag NPs) by Liquid Phase-Pulsed Laser Ablation (LP-PLA) has attracted a lot of attention. Basically, this technique allows producing various metallic nanoparticles with controlled size, shape, composition or surroundings in several liquids (i.e.: water, ethanol, acetone, toluene,…). Recently, such processes have been studied in liquid organic monomer such as methyl methacrylate (MMA). However, the influence of the laser parameters on the materials synthesised in such reactive liquid and their features were not fully investigated so far...
June 19, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/28603970/microbots-decorated-with-silver-nanoparticles-kill-bacteria-in-aqueous-media
#6
Diana Vilela, Morgan M Stanton, Jemish Parmar, Samuel Sanchez
Water contamination is one of the most persistent problems in public health. The resistance of some pathogens to conventional disinfectants can require the combination of multiple disinfectants or increased disinfectant dosages which may produce harmful by-products. Here, we describe an efficient disinfection and removal method of Escherichia coli (E. coli) from contaminated water by using water self-propelled Janus microbots decorated with silver nanoparticles (AgNPs). The spherical Janus microbot's structure consists of a magnesium (Mg) microparticle as a template that also functions as propulsion source by producing hydrogen bubbles while in contact with water, an inner iron (Fe) magnetic layer for their remote guidance and collection, and an outer AgNP coated gold (Au) layer for bacteria adhesion and bactericidal properties...
June 12, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28598149/taking-the-silver-bullet-colloidal-silver-particles-for-the-topical-treatment-of-biofilm-related-infections
#7
Katharina Richter, Paula Facal, Nicky Thomas, Ilse Vandecandelaere, Mahnaz Ramezanpour, Clare Cooksley, Clive A Prestidge, Tom Coenye, Peter-John Wormald, Sarah Vreugde
BACKGROUND: Biofilms are aggregates of bacteria residing in a self-assembled matrix, which protects these sessile cells against external stress, including antibiotic therapies. In light of emerging multidrug-resistant bacteria alternative strategies to antibiotics are emerging. The present study evaluated the activity of colloidal silver nanoparticles (AgNPs) of different shapes against biofilms formed by Staphylococcus aureus (SA), methicillin-resistant SA (MRSA) and Pseudomonas aeruginosa (PA)...
June 9, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28596004/synthesis-of-dextrin-stabilized-colloidal-silver-nanoparticles-and-their-application-as-modifiers-of-cement-mortar
#8
Emilia Konował, Marta Sybis, Anna Modrzejewska-Sikorska, Grzegorz Milczarek
Various commercial dextrins were used as reducing and stabilizing agents for a novel one-step synthesis of silver nanoparticles from ammonia complexes of silver ions. As a result, stable colloids of silver were formed during the reaction with the particle size being the function of the dextrin type. The obtained colloids were characterized by UV-vis spectrophotometry, size distribution (using Non-Invasive Backscatter optics) and transmission electron microscopy (TEM). The achieved results clearly indicate the possibility of low-cost production of large quantities of colloidal silver nanoparticles using materials derived from renewable sources...
June 6, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28587297/biogenic-synthesis-of-metal-nanoparticles-using-a-biosurfactant-extracted-from-corn-and-their-antimicrobial-properties
#9
Sergio Gómez-Graña, María Perez-Ameneiro, Xanel Vecino, Isabel Pastoriza-Santos, Jorge Perez-Juste, José Manuel Cruz, Ana Belén Moldes
A new and promising biosurfactant extracted from corn steep liquor has been used for the green synthesis of gold and silver nanoparticles (NPs) in a one-step procedure induced by temperature. Most of the biosurfactants proposed in the literature are produced by pathogenic microorganisms; whereas the biosurfactant used in the current work was extracted from a liquid stream, fermented spontaneously by lactic acid bacteria, which are "generally recognized as safe" (GRAS) microorganisms. The reduction of a gold precursor in the presence of a biosurfactant gives rise to a mixture of nanospheres and nanoplates with distinct optical features...
June 6, 2017: Nanomaterials
https://www.readbyqxmd.com/read/28564492/photoinitiated-polymerization-induced-self-assembly-of-glycidyl-methacrylate-for-the-synthesis-of-epoxy-functionalized-block-copolymer-nano-objects
#10
Jianbo Tan, Dongdong Liu, Chundong Huang, Xueliang Li, Jun He, Qin Xu, Li Zhang
Herein, a novel photoinitiated polymerization-induced self-assembly formulation via photoinitiated reversible addition-fragmentation chain transfer dispersion polymerization of glycidyl methacrylate (PGMA) in ethanol-water at room temperature is reported. It is demonstrated that conducting polymerization-induced self-assembly (PISA) at low temperatures is crucial for obtaining colloidal stable PGMA-based diblock copolymer nano-objects. Good control is maintained during the photo-PISA process with a high rate of polymerization...
May 31, 2017: Macromolecular Rapid Communications
https://www.readbyqxmd.com/read/28553474/impact-and-oxidation-of-single-silver-nanoparticles-at-electrode-surfaces-one-shot-versus-multiple-events
#11
Jon Ustarroz, Minkyung Kang, Erin Bullions, Patrick R Unwin
Single nanoparticle (NP) electrochemical impacts is a rapidly expanding field of fundamental electrochemistry, with applications from electrocatalysis to electroanalysis. These studies, which involve monitoring the electrochemical (usually current-time, I-t) response when a NP from solution impacts with a collector electrode, have the scope to provide considerable information on the properties of individual NPs. Taking the widely studied oxidative dissolution of individual silver nanoparticles (Ag NPs) as an important example, we present measurements with unprecedented noise (< 5 pA) and time resolution (time constant 100 μs) that are highly revealing of Ag NP dissolution dynamics...
March 1, 2017: Chemical Science
https://www.readbyqxmd.com/read/28553102/two-dimensional-collagen-graphene-as-colloidal-templates-for-biocompatible-inorganic-nanomaterial-synthesis
#12
Divya Kumari, Lubna Sheikh, Soumya Bhattacharya, Thomas J Webster, Suprabha Nayar
In this study, natural graphite was first converted to collagen-graphene composites and then used as templates for the synthesis of nanoparticles of silver, iron oxide, and hydroxyapatite. X-ray diffraction did not show any diffraction peaks of graphene in the composites after inorganic nucleation, compared to the naked composite which showed (002) and (004) peaks. Scanning electron micrographs showed lateral gluing/docking of these composites, possibly driven by an electrostatic attraction between the positive layers of one stack and negative layers of another, which became distorted after inorganic nucleation...
2017: International Journal of Nanomedicine
https://www.readbyqxmd.com/read/28552424/physicochemical-and-colloidal-aspects-of-food-matrix-effects-on-gastrointestinal-fate-of-ingested-inorganic-nanoparticles
#13
REVIEW
David Julian McClements, Hang Xiao, Philip Demokritou
Inorganic nanoparticles, such as titanium dioxide, silicon dioxide, iron oxide, zinc oxide, or silver nanoparticles, are added to some food products and food packaging materials to obtain specific functional attributes, such as lightening, powder flow, nutrition, or antimicrobial properties. These engineered nanomaterials (ENMs) all have dimensions below 100nm, but may still vary considerably in composition, morphology, charge, surface properties and aggregation state, which effects their gastrointestinal fate and potential toxicity...
May 9, 2017: Advances in Colloid and Interface Science
https://www.readbyqxmd.com/read/28535789/a-multi-target-therapeutic-potential-of-prunus-domestica-gum-stabilized-nanoparticles-exhibited-prospective-anticancer-antibacterial-urease-inhibition-anti-inflammatory-and-analgesic-properties
#14
Nazar Ul Islam, Raza Amin, Muhammad Shahid, Muhammad Amin, Sumera Zaib, Jamshed Iqbal
BACKGROUND: Phytotherapeutics exhibit diverse pharmacological effects that are based on the combined action of a mixture of phytoconstituents. In this study, Prunus domestica gum-loaded, stabilized gold and silver nanoparticles (Au/Ag-NPs) were evaluated for their prospective anticancer, antibacterial, urease-inhibition, anti-inflammatory, and analgesic properties. METHODS: Au/Ag-NPs were biosynthesized and characterized with UV-Vis, FTIR, SEM, EDX, and XRD techniques...
May 23, 2017: BMC Complementary and Alternative Medicine
https://www.readbyqxmd.com/read/28530184/green-synthesis-of-silver-nanoparticles-using-mentha-pulegium-and-investigation-of-their-antibacterial-antifungal-and-anticancer-activity
#15
Ali Hamad Abd Kelkawi, Abolghasem Abbasi Kajani, Abdol-Khalegh Bordbar
A simple and eco-friendly method for efficient synthesis of stable colloidal silver nanoparticles (AgNPs) using Mentha pulegium extracts is described. A series of reactions was conducted using different types and concentrations of plant extract as well as metal ions to optimize the reaction conditions. AgNPs were characterized by using UV-vis spectroscopy, transmission electron microscopy, atomic force microscopy, dynamic light scattering, zetasizer, energy-dispersive X-ray spectroscopy (EDAX) and Fourier transform infrared spectroscopy (FTIR)...
June 2017: IET Nanobiotechnology
https://www.readbyqxmd.com/read/28528626/colloid-particle-formulations-for-antimicrobial-applications
#16
REVIEW
Ahmed F Halbus, Tommy S Horozov, Vesselin N Paunov
Colloidal particles are being extensively studied in various antimicrobial applications due to their small size to volume ratio and ability to exhibit a wide spectrum of antibacterial, antifungal, antialgal and antiviral action. The present review focuses on various nanoparticles (NPs) of inorganic, organic and hybrid materials, and discusses some of the methods for their preparation as well as mechanisms of their antimicrobial action. We consider the antimicrobial applications of metal oxide nanoparticles (ZnO, MgO, CuO, Cu2O, Al2O3, TiO2, CeO2 and Y2O3), metal nanoparticles (NPs), such as copper, silver and gold, metal hydroxide NPs such as Mg(OH)2 as well as hybrid NPs made from biodegradable materials, such as chitosan, lignin and dextran, loaded with other antimicrobial agents...
May 12, 2017: Advances in Colloid and Interface Science
https://www.readbyqxmd.com/read/28511013/reversible-tunable-electric-field-driven-assembly-of-silver-nanocrystal-superlattices
#17
Yixuan Yu, Dian Yu, Christine A Orme
Nanocrystal superlattices are typically fabricated by either solvent evaporation or destabilization methods that require long time periods to generate highly ordered structures. In this paper, we report for the first time the use of electric fields to reversibly drive nanocrystal assembly into superlattices without changing solvent volume or composition, and show that this method only takes 20 min to produce polyhedral colloidal crystals, which would otherwise need days or weeks. This method offers a way to control the lattice constants and degree of preferential orientation for superlattices and can suppress the uniaxial superlattice contraction associated with solvent evaporation...
June 14, 2017: Nano Letters
https://www.readbyqxmd.com/read/28501158/poly-vinyl-alcohol-capped-silver-nanoparticles-for-antioxidant-assay-based-on-seed-mediated-nanoparticle-growth
#18
Saowapak Teerasong, Amornrassamee Jinnarak, Sumonmarn Chaneam, Prapin Wilairat, Duangjai Nacapricha
A simple and rapid method for measurement of total antioxidant capacity (TAC) was developed. In this work, gallic acid was used as the antioxidant standard. Poly(vinyl alcohol) embedded silver nanoparticles (PVA-AgNPs) were employed as a colorimetric sensor. The detection principle was based on the seed-mediated nanoparticle growth technique. The PVA-AgNPs act as a catalyst in the reduction of Ag(+) by gallic acid by providing nucleation seeds. Ag(+) was reduced to Ag° and accumulated on the PVA-AgNP surface, leading to an increase in the size of particles...
August 1, 2017: Talanta
https://www.readbyqxmd.com/read/28493638/chemically-controlled-spatiotemporal-oscillations-of-colloidal-assemblies
#19
Alicia Altemose, María Antonieta Sánchez-Farrán, Wentao Duan, Steve Schulz, Ali Borhan, Vincent H Crespi, Ayusman Sen
We report an autonomous oscillatory micromotor system in which active colloidal particles form clusters, the size of which changes periodically. The system consists of an aqueous suspension of silver orthophosphate microparticles under UV illumination, in the presence of varying concentrations of hydrogen peroxide. The colloid particles first attract each other to form clusters. After a short delay, these clusters abruptly disperse and oscillation begins, alternating between clustering and dispersion of particles...
June 26, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28476988/plants-used-in-folkloric-medicine-of-iran-are-exquisite-bio-resources-in-production-of-silver-nanoparticles
#20
Mohadeseh Hassani Sadi, Gholam Hosein Shahidi Bonjar
This study reports screening of 102 Iranian medicinal plant species belonging to 49 families for the biosynthesis of colloidal silver nanoparticles (AgNPs). Among tested plants, 37 species in 19 plant families are new bio-resources in this regard. Water extracts of macerated plant parts are used in this survey. Six of the bioactive plants are selected for further analysis. They produced amorphous spherical 40-70 nm AgNPs. Biosynthesised colloidal AgNPs are characterised by UV-visible spectroscopy, transmission electron microscopy and scanning electron microscopy...
April 2017: IET Nanobiotechnology
keyword
keyword
77920
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"