Consulta: subjectFacets:"Silver nanoparticles"
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Data/hora: 09/06/2024 02:56:43

Morphometric Alterations Induced by the Toxicity of Variable Sizes of Silver Nanoparticles
Provedor de dados: International Journal of Morphology
Autores: Almansour,Mansour; Jarrar,Qais; Battah,Abdelkader; Jarrar,Bashir.
Silver nanoprticles (SNPs) are invested in medical, industrial and environmental applications. Little if any, is known about the morphometric alterations induced by the toxicity of SNPs. The aim of the present work is to find out the effect of variable size of SNPs on different morphometric parameters. Adult healthy male mice (BAL/C) were subjected to (10 nm, 20 nm, 40 nm 60 nm and 100 nm) SNPs for 35 days. Silver NPs caused non-significant decline on the average weight, significant decline in food consumption, increase in water intake, unilateral blindness, tanning fur color and cholestasis together with a decrease in the relative ratio of the liver, kidney and spleen weight to body weight. Mice subjected to 10 nm and 20 nm were more affected than mice...
Tipo: Journal article
Palavras-chave: Silver nanoparticles; Morphology; Toxicology; Liver; Kidney; Spleen.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022015000200022

Rapid green synthesis of silver nano particles from Ziziphus mauritiana and antibacterial activity against human pathogens
Provedor de dados: Acta Scientiarum: Biological Sciences
Autores: Asha, Sivaji; Thirunavukkarasu, Palaniyandi.
A novel green source Ziziphus mauritiana fresh young leaves was opted to synthesize silver nanoparticles and analyze its antibacterial activity. The bioactive compounds present in the plant extracts reduced silver ions to NPs, indicated by change in color from red to dark brown. In this study, we have successfully synthesized nanoparticles using Z. mauritiana aqueous leaf extract as a reducing agent and the reaction process of synthesized nanoparticles was monitored by UV-Vis spectroscopy. The UV-Vis absorption peak showed maximum adsorption at 420 nm confirmed the silver nanoparticles synthesis. Further characterization was carried out by FTIR and the results recorded a downward shift of absorption the bands between 400 to 4000 cm-1 indicates the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Aqueous extract; Silver nanoparticles; Anti-bacterial activity; Human pathogens.
Ano: 2019
URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/45262

Biologically Synthesized Silver Nanoparticles for Enhancing Tetracycline Activity Against Staphylococcus aureus and Klebsiella pneumoniae
Provedor de dados: Brazilian Archives of Biology and Technology
Autores: Hussein,Elsayed Alsaied Masoud; Mohammad,Ali Al-Hajry; Harraz,Farid Abourageh; Ahsan,Mohd Faisal.
Abstract Phytochemical content of plant extracts can be used effectively to reduce the metal ions to nanoparticles in one-step green synthesis process. In this study, six plant extracts were used for the synthesis of silver nanoparticles (AgNPs). Biologically synthesized AgNPs was characterized using UV-Vis Spectrophotometer, Field Emission Scanning Electron Microscope (FE-SEM), X-ray diffraction (XRD), Energy Dispersive X-ray spectroscopy (EDX) and Fourier Transform Infrared (FTIR) spectroscopy. The individual and combined effects of AgNPs and tetracycline against S. aureus and K. pneumoniae were assessed. Ginger, onion and sidr extracts supported AgNPs formation while arak, garlic and mint extracts failed to convert the silver ions to AgNPs. The present...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Silver nanoparticles; Biosynthesis; Plant extracts; Tetracycline; S. aureus; K. pneumoniae.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132019000100308

Green Synthesis of AgNPs Stabilized with biowaste and their antimicrobial activities
Provedor de dados: Brazilian Journal of Microbiology
Autores: Jasuja,Nakuleshwar Dut; Gupta,Deepak Kumar; Reza,Mohtashim; Joshi,Suresh C.
In the present study, rapid reduction and stabilization of Ag+ ions with different NaOH molar concentration (0.5 mM, 1.0 mM and 1.5 mM) has been carried out in the aqueous solution of silver nitrate by the bio waste peel extract of P.granatum. Generally, chemical methods used for the synthesis of AgNPs are quite toxic, flammable and have adverse effect in medical application but green synthesis is a better option due to eco-friendliness, non-toxicity and safe for human. Stable AgNPs were synthesized by treating 90 mL aqueous solution of 2 mM AgNO3 with the 5 mL plant peels extract (0.4% w/v) at different NaOH concentration (5 mL). The synthesized AgNPs were characterized by UV-Vis spectroscopy, TEM and SEM. Further, antimicrobial activities of AgNPs were...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Silver nanoparticles; Biowaste; Antibacterial activity; MIC; SEM; TEM.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822014000400024

Antibacterial properties of silver nanoparticles synthesized by marine Ochrobactrum sp.
Provedor de dados: Brazilian Journal of Microbiology
Autores: Thomas,Roshmi; Janardhanan,Anju; Varghese,Rintu T.; Soniya,E.V.; Mathew,Jyothis; Radhakrishnan,E.K.
Metal nanoparticle synthesis is an interesting area in nanotechnology due to their remarkable optical, magnetic, electrical, catalytic and biomedical properties, but there needs to develop clean, non-toxic and environmental friendly methods for the synthesis and assembly of nanoparticles. Biological agents in the form of microbes have emerged up as efficient candidates for nanoparticle synthesis due to their extreme versatility to synthesize diverse nanoparticles with varying size and shape. In the present study, an eco favorable method for the biosynthesis of silver nanoparticles using marine bacterial isolate has been attempted. Very interestingly, molecular identification proved it as a strain of Ochrobactrum anhtropi. In addition, the isolate was found...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biosynthesis; Silver nanoparticles; Ochrobactrum anhtropi; Purification; Antibacterial activity.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822014000400012

Determination of cefotaxime, cefoperazone, ceftazidime and cefadroxil using surface plasmon resonance band of silver nanoparticles
Provedor de dados: Brazilian Journal of Pharmaceutical Sciences
Autores: Salem,Hesham; Samir,Ebtihal.
The aim of this work is to evaluate simple, sensitive, effective and validated procedures for the determination of cefotaxime, cefoperazone, ceftazidime and cefadroxil. In this study, the methods based on the ability of the cited drugs to reduce Ag+ ions to silver nanoparticles (Ag-NPs) in the presence of Polyvinyl Pyrrolidone (PVP) as a stabilizing agent producing very intense surface plasmon resonance peak of Ag-NPs (λmax. = 410-430 nm). The plasmon absorbance of the Ag-NPs allows the quantitative spectrophotometric determination of the cited drugs. The calibration curves are linear with concentration ranges of 0.4-3.2, 1-8, 0.5-4.0 and 1.5-9.0 µg/mL for cefotaxime, cefoperazone, ceftazidime and cefadroxil, respectively. Apparent molar absorptivity,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Silver nanoparticles; Cefotaxime; Cefoperazone; Ceftazidime; Cefadroxil.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-82502018000300617

Preparation and characterization of liposomes loaded with silver nanoparticles obtained by green synthesis
Provedor de dados: Brazilian Journal of Pharmaceutical Sciences
Autores: Espinoza,Joel Toribio; Novak,Robson Schimandeiro; Magalhães,Cássia Gonçalves; Budel,Jane Manfron; Justus,Barbara; Gonçalves,Melissa Marques; Boscardin,Patricia Mathias Döll; Farago,Paulo Vitor; Paula,Josiane de Fátima Padiha De.
The objective of this work was to develop and characterize liposomes loaded with silver nanoparticles (LAgNPs) to show improvement in stability characteristics. AgNPs were prepared by the green synthesis method with Aloe vera gel extract and exposure to sunlight. Liposomes were prepared by the modified reverse phase method. Particle size, polydispersity index, zeta potential, as well as the scanning electron microscopy (SEM) morphological aspects of AgNPs and LAgNPs were evaluated. In addition, was used flame atomic absorption spectroscopy to determine the amount of AgNP that was encapsulated in liposomes. The AgNPs presented as amorphous and polydisperse structures, with a mean diameter of 278.46 nm and zeta potential of -18.3 mV. LAgNPs had a mean...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Silver nanoparticles; Aloe vera; Sunlight; Liposomes.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-82502020000100625

In vitro biological activities of silver nanoparticles synthesized from Scedosporium sp. isolated from soil
Provedor de dados: Brazilian Journal of Pharmaceutical Sciences
Autores: Panchangam,Rajeeva Lochana; Upputuri,Ravi Theaj Prakash.
One of the important fields in nanotechnology is the development of an environment friendly method for the synthesis of nanoparticles. Many approaches show that microorganisms are the most reliable tools for biosynthesis of nanoparticles compared to physical and chemical methods. In our study, fungi have been exploited for extracellular production of metal nanoparticles. It was observed that in Scedosporium, silver ions are reduced to silver nanoparticles, which was confirmed by UV-visible spectrophotometry and AFM. Optimization studies showed that as the concentration of AgNO3 used for synthesis increased, particles’ size also increased. Size of the particles at different concentrations of AgNO3 was observed to be 79-107 nm with particles being...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Atomic force microscopy; In vitro cytotoxicity; Scedosporium sp; Silver nanoparticles; UV-visible spectroscopy.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-82502019000100577