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Tytuł:
Preparation of silver core nanoparticles with polysaccharide shell
Autorzy:
Wasiak, I.
Ciach, T.
Powiązania:
https://bibliotekanauki.pl/articles/115937.pdf
Data publikacji:
2012
Wydawca:
Fundacja na Rzecz Młodych Naukowców
Tematy:
silver nanoparticles
dextran
polyaldehydodextran
Opis:
The objective of the present study was to obtain silver core nanoparticles coated with dextran shell. In the described method dextran plays role of reductive and protective agent and also functionalisation ligand. Our research was aimed at nanoparticles synthesis at 37°C. It is the human body temperature, which is safe for temperature-sensitive drugs (proteins). In the presented work the time of reaction, dextran molecular weight and its chemical functionalisation was investigated. Particles were characterized by Nanosight and SEM, their UV–Vis spectroscopic absorption properties were also determined. Nanoparticles with diameter less than 95 nm with relatively narrow size distribution were obtained. Our work demonstrated that it was possible to obtain nanoparticles in 37°C without using any harmful reagents.
Źródło:
Challenges of Modern Technology; 2012, 3, 2; 15-17
2082-2863
2353-4419
Pojawia się w:
Challenges of Modern Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of silver nanoparticles on chicken health after infection with Campylobacter jejuni
Autorzy:
Chwalibog, A.
Vadalasetty, K. P.
Lauridsen, Ch.
Engberg, R. G.
Vadalasetty, R.
Kutwin, M.
Sawosz, E.
Powiązania:
https://bibliotekanauki.pl/articles/285844.pdf
Data publikacji:
2017
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Tematy:
silver nanoparticles
birds
broilers
Źródło:
Engineering of Biomaterials; 2017, 20, no. 143 spec. iss.; 52
1429-7248
Pojawia się w:
Engineering of Biomaterials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Silver nanoparticles as an alternative strategy against bacterial biofilms
Autorzy:
Markowska, Katarzyna
Grudniak, Anna
Wolska, Krystyna
Powiązania:
https://bibliotekanauki.pl/articles/1039436.pdf
Data publikacji:
2013
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
biofilm
antibacterial
silver nanoparticles
Opis:
Biofilms are complex bacterial communities that resist the action of antibiotics and the human immune system. Bacteria within biofilms are the cause of numerous, almost impossible to eradicate, persistent infections. Biofilms can form on many medical devices and implants, and so have an enormous impact on medicine. Due to the lack of effective anti-biofilm antibiotics, novel alternative compounds or strategies are urgently required. This review describes some of the latest approaches in the field of biofilm treatment. New anti-biofilm technologies target different stages in the biofilm formation process. Some act to modify the colonized biomaterials to make them resistant to biofilm formation. One potentially important candidate treatment uses silver nanoparticles that show anti-bacterial and anti-biofilm activity. The biological action of nano-silver is complex and seems to involve a number of pathways. However, there have been few reports on the anti-biofilm activity of silver nanoparticles and the precise mechanism underlying their action remains unresolved. Here, we describe some anti-biofilm approaches employing AgNPs and consider the challenges and problems that need to be addressed in order to make silver nanoparticles a part of an effective anti-biofilm strategy.
Źródło:
Acta Biochimica Polonica; 2013, 60, 4; 523-530
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Nanosilver - does it have only one face?
Autorzy:
Likus, Wirginia
Bajor, Grzegorz
Siemianowicz, Krzysztof
Powiązania:
https://bibliotekanauki.pl/articles/1039429.pdf
Data publikacji:
2013
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
silver nanoparticles
antibacterial activity
toxicology
Opis:
Silver nanoparticles (NPs) have at least one dimension of a particle smaller than 100 nm and contain 20-15,000 silver atoms. Due to its antibacterial activity nanosilver (NS) is used for medical purposes. NS particles can be obtained by various methods. Potentially, the best method of the NS synthesis for medical purposes is based on a brief flow of electric current between two silver electrodes placed in deionized water. It is accepted that the major antibacterial effect of silver is its partial oxidation and releasing silver ions, which interact with thiol groups of peptidoglicans of bacterial cell wall, and proteins of the cell membrane causing cell lysis. Silver ions can also bind to bacterial DNA preventing its replication and stopping synthesis of bacterial proteins. The rise in exposure to silver NPs has spurred interest into their toxicology. NS undergoes a set of biochemical transformations including accelerated oxidative dissolution in gastric acid, binding to thiol groups of serum and tissue proteins, exchange between thiol groups, sulfides and selenides, binding to selenoproroteins and photoreduction in skin to zerovalent metallic silver. Animal studies have shown that exposure to NS may lead to liver and spleen damage. NS can also stimulate an increased secretion of proinflammatory cytokines by monocytes. As a spectrum of NS applications is still growing, the complex evaluation of a safety of its use becomes an important task. This requires an elucidation of not only the influence of NS on human cells and organism, but also its biotransformation in organism and in environment.
Źródło:
Acta Biochimica Polonica; 2013, 60, 4; 495-501
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Biomaterials with antibacterial activity
Autorzy:
Wysocka, K.
Buzalewicz, I.
Wieliczko, A.
Kowal, K.
Stręk, W.
Podbielska, H.
Powiązania:
https://bibliotekanauki.pl/articles/284386.pdf
Data publikacji:
2008
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Tematy:
biomaterials
silver nanoparticles
antibacterial activity
Opis:
The sol-gel derived silica spheres with surfaces modified by silver nanoparticles were used to enhance the photodynamic effect. The silica nanoparticles were prepared by modified Stöber synthesis. The diameter of obtained silica spheres was ca. 100 nm. These silica spheres we used as a carrier for noble nanoparticles. It was shown that Ag-Au nanoparticles have an antibacterial activity against Escherichia coli. This effect depends on the nanoparticles concentration and it is stronger for higher concentrations. Laser irradiation enhances this effect, and starting from certain concentration it is possible to kill Escherichia coli, totally, when using laser light.
Źródło:
Engineering of Biomaterials; 2008, 11, no. 81-84; 119-121
1429-7248
Pojawia się w:
Engineering of Biomaterials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Research on deposition of silver nanoparticles at the cellulose/NaNO3 electrolyte interface
Autorzy:
Janusz, Władysław
Kowalska, Klaudia
Skwarek, Ewa
Powiązania:
https://bibliotekanauki.pl/articles/24085716.pdf
Data publikacji:
2023
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
nanomaterials
silver nanoparticles
cellulose
biocomposites
Opis:
Currently the research on silver nanoparticles is of great demand owing to their antibacterial properties. One of the possibilities is the study of the silver deposition on the cellulose fibers, and more specifically of the silver nanoparticles and cellulose particles. The research was aimed at obtaining silver nanostructures by reducing ions with formaldehyde and then stabilizing them with the Pluronic solution. A suspension system containing cellulose fibers and silver nanoparticles was prepared in the basic electrolyte NaNO3. There were analyzed the following makes: pH of solutions, grain distribution and zeta potential ζ. Ag nanoparticles are largely applied in medicine, pharmacy, cosmetology and textile industry. Great interest in the nanostructures allows for developing knowledge about them, and thus creating the possibility of further improvement of their properties for subsequent applications.
Źródło:
Physicochemical Problems of Mineral Processing; 2023, 59, 4; art. no. 173554
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation on the Role of Nanoparticle on Microbial Nano Interface to Understand Pathogenecity
Autorzy:
Kumar, C. Naveen
Radhakrishnan, B.
Santhanam, Amutha
Powiązania:
https://bibliotekanauki.pl/articles/1031841.pdf
Data publikacji:
2020
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Antimicrobial
Salmonella typhi
Silver nanoparticles
Opis:
Nano-biotechnology represents the intersection of nanotechnology and biotechnology which is an emerging field in creation, productivity and utility of nanoscale structures for advanced biotechnology. Plant and plant extract are considered as green and effective paths in the synthesis of gold and silver nanoparticles. The aim of the present study is to analyze the interaction of silver nanoparticles synthesized from herbal source (Cinnamon zeylanicum) with pathogenic bacteria Salmonella typhi (S. typhi) in order to know the microbe pathogenicity. The micro-nano interface disturbed the growth of microbes. Under the influence of different concentration of nanoparticles (50 µL to 1,000 µL), the microbes exhibited slow growth as compared to control. The viable cell count also decreased as the nanoparticles concentration increased. This shows major difference in the bacterial culture of with and without nano particle. Under normal culture, without nanoparticles intervention, the microbes show lag phase at 0-4 h, the log phase begins and its exponential growth occurs between 4-8 h and after 12 h, stationary phase was attained. There was a slow growth observed when the culture was exposed to silver nanoparticles. This clearly shows the antimicrobial effect of nanoparticles. In this study we used green synthesized nanoparticles, which have shown a good antibacterial efficacy against the pathogenic microorganism Salmonella typhi.
Źródło:
World News of Natural Sciences; 2020, 30, 2; 89-95
2543-5426
Pojawia się w:
World News of Natural Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Nonlinear-optical refraction of silver nanoparticle composites
Autorzy:
Gamernyk, R
Periv, M
Malynych, S
Powiązania:
https://bibliotekanauki.pl/articles/173720.pdf
Data publikacji:
2014
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
silver nanoparticles
nonlinear optics
Z-scan
Opis:
In this paper, the experimental data on nonlinear refraction of silver nanoparticle composites using a standard Z-scan technique are presented. It was found that the colloids of silver nanoparticles of various size possess a defocusing ability. Based on general considerations, one can conclude thermal lens nature of the nonlinear refraction of the colloids. Significantly different magnitudes of the nonlinear refractive index of silver nanoparticles suspended in water and in glycerol can be explained by differences in the specific heat capacity of mentioned fluids. The effective thickness for nonlinear-optical interaction of light with a two-dimensional silver nanoparticle array was estimated.
Źródło:
Optica Applicata; 2014, 44, 3; 389-398
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Green chemistry for the preparation of silver nanoparticles using mint leaf leaves extracts and evaluation of their antimicrobial potential
Autorzy:
Aziz, Wisam J.
Jassim, Haneen A.
Powiązania:
https://bibliotekanauki.pl/articles/1112556.pdf
Data publikacji:
2018
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Green synthesis
Mentha (Mint)
Silver Nanoparticles
Opis:
The aim of this study was to develop a green synthesis of silver nanoparticles using mint plant leaves extracts. The fresh suspension of plant extracts was yellowish-green in color. However, after the addition of AgNO3 within 15min, the suspension showed a change in color to dark brown after 5 hours of incubation at room temperature. The formation of silver nanoparticles was confirmed using UV-Vis spectral analysis and revealed silver surface plasmon resonance band to be in a range around 200-500 nm. The XRD pattern showed the characteristic bragg peaks of (111), (200) and (220) planes of the face center cubic (FCC) silver nanoparticles AgNPS. Under scanning electron microscope (SEM), silver nanoparticles with a mean particle size of 26 nm and a spherical shape were most frequently observed. In testing, the synthesized AgNPs colloidal solution showed better antibacterial activity against both Gram-positive and Gram-negative bacterial strains. The diameter of the inhibition zones of AgNPs at 50 µg/ml concentration against bacterial strains such as Bacillus subtilis and Escherichia coli were 25 mm and 20 mm, respectively.
Źródło:
World News of Natural Sciences; 2018, 18, 2; 163-170
2543-5426
Pojawia się w:
World News of Natural Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Cytotoxicity of hydroxyapatite coatings modified with silver nanoparticles
Autorzy:
Sulej-Chojnacka, J.
Ignatiev, M.
Powiązania:
https://bibliotekanauki.pl/articles/283892.pdf
Data publikacji:
2012
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Tematy:
plasma spraying
hydroxyapatite
silver nanoparticles
cytotoxicity
Opis:
Application of nanosized particles with antibacterial properties is of great interest in the development of new biocompatible products. Due to the excellent antibacterial activity Ag NPs and Ag NPs containing composites are widely used in many bactericidal applications. The objective of the present research is to characterize the cytotoxity properties of plasma sprayed hydroxyapatite coating (HA) modified by sedimentation of Ag NPs on its' surface. The present research was carried out in the frame of European FP7 NANOMINING Project "Development of New Nanocomposites Using Materials from Mining Industry" (NMP4-CP-2011-263942).
Źródło:
Engineering of Biomaterials; 2012, 15, no. 116-117 spec. iss.; 6-7
1429-7248
Pojawia się w:
Engineering of Biomaterials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synthesis and antibacterial properties of Fe3O4-Ag nanostructures
Autorzy:
Pachla, A.
Lendzion-Bieluń, Z.
Moszyński, D.
Markowska-Szczupak, A.
Narkiewicz, U.
Wróbel, R. J.
Guskos, N.
Żołnierkiewicz, G.
Powiązania:
https://bibliotekanauki.pl/articles/778603.pdf
Data publikacji:
2016
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
Fe3O4 nanoparticles
superparamagnetic nanoparticles
silver nanoparticles
Opis:
Superparamagnetic iron oxide nanoparticles were obtained in the polyethylene glycol environment. An effect of precipitation and drying temperatures on the size of the prepared nanoparticles was observed. Superparamagnetic iron oxide Fe3O4 , around of 15 nm, was obtained at a precipitation temperature of 80°C and a drying temperature of 60°C. The presence of functional groups characteristic for a polyethylene glycol surfactant on the surface of nanoparticles was confirmed by FTIR and XPS measurements. Silver nanoparticles were introduced by the impregnation. Fe3O4-Ag nanostructure with bactericidal properties against Escherichia coli species was produced. Interesting magnetic properties of these materials may be helpful to separate the bactericidal agent from the solution.
Źródło:
Polish Journal of Chemical Technology; 2016, 18, 4; 110-116
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Assessment of in situ-Prepared Polyvinylpyrrolidone-Silver Nanocomposite for Antimicrobial Applications
Autorzy:
El Hotaby, W.
Sherif, H.
Hemdan, B.
Khalil, W.
Khalil, S.
Powiązania:
https://bibliotekanauki.pl/articles/1032332.pdf
Data publikacji:
2017-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
silver nanoparticles
polyvinylpyrrolidone
nanocomposite
antimicrobial activity
cytotoxicity
Opis:
Polyvinylpyrrolidone (PVP) is employed in several potential applications, relying of its special chemical and physical properties in addition to its low toxicity and biocompatibility. The aim of this work is to prepare polyvinylpyrrolidone-silver (PVP-Ag) nanocomposite with high inhibiting effect on the microbial growth and low cytotoxicity. In situ prepared small stable spherical silver nanoparticles, with narrow range particle size distribution, were obtained by easy, economical and rapid chemical reduction method. Silver ions were reduced to silver nanoparticles using low amount of sodium borohydride (NaBH₄) as a strong reducing agent. PVP-Ag nanocomposite was prepared using PVP as a stabilizing and capping agent. Formation of the spherical silver nanoparticles with mean particle size 5 nm was confirmed by ultraviolet-visible spectroscopy, high resolution transmission electron microscopy, and dynamic light scattering. The inhibiting growth effect of the nanocomposite toward Gram-positive bacteria (Staphylococcus aureus), Gram-negative bacteria (Pseudomonas aeruginosa), and yeast fungus (Candida albicans) were studied. The cytotoxicity of the nanocomposite against BJ1 normal skin fibroblast cell line was tested. Results of this work presented perfect antimicrobial activity of the PVP-Ag nanocomposite towards bacteria and fungi with low cytotoxicity, which may lead to promising applications in skin wound healing.
Źródło:
Acta Physica Polonica A; 2017, 131, 6; 1554-1560
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of the silver nanoparticles on microbial community in different environments
Autorzy:
Pietrzak, Katarzyna
Gutarowska, Beata
Powiązania:
https://bibliotekanauki.pl/articles/1038896.pdf
Data publikacji:
2015
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
silver nanoparticles
disinfection
microorganisms
sewage
water
soil
Opis:
The aim of this study was to assess the influence of silver nanoparticles (AgNPs) on the number and diversity of microbial community in different environments (soil extract, water, sewage), and to determine whether the environment inhibits or accelerates the influence of AgNPs on moulds. AgNPs (45 ppm) present in the environment decreased bacterial (91%) and fungal (33-85%) numbers, and eliminated some strains, e.g., Alternaria alternata and Cryptococcus laurentii. Based on the biomass growth of Aspergillus niger and Penicillium chrysogenum in a medium with AgNPs and the environmental samples, it was noticed that environment can enhance (soil extract) or inhibit (sewage) antifungal activity of AgNPs.
Źródło:
Acta Biochimica Polonica; 2015, 62, 4; 721-724
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optical Properties of Intraocular Implants Coated with Silver Nanoparticles
Autorzy:
Jeż, Kinga
Gacek, Marcin
Nabiałek, Marcin
Tóth, László
Pike-Biegunski, M.
Powiązania:
https://bibliotekanauki.pl/articles/2049713.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
UV-Vis spectroscopy
intraocular lenses
silver nanoparticles
Opis:
Prolonged exposure to UV radiation, and ever-increasing life expectancy, mean that an increasing proportion of the population suffers from clouding of the intraocular lens. Nowadays, the performance of intraocular implantation procedures is commonplace. Unfortunately, with the increasing number of operations, the number of postoperative complications is also increasing. One way to avoid complications may be to use an intraocular implant that has been immersed in a solution containing silver nanoparticles. As part of the study, four selected intraocular implants – that are available on the ophthalmic market – were tested. In order to investigate the effect of silver particles on the optical properties of the implants, tests were carried out using a UV-VIS spectrophotometer. Two series of implants were tested: before and after immersion in a silver solution. The implants were immersed for a period of 7 days. It was found that the presence of silver particles does not have a negative impact on the translucency of the implants.
Źródło:
Archives of Metallurgy and Materials; 2021, 66, 2; 477-481
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Bio synthesis and characterization of silver nanoparticles using Lagenaria siceraria leaf extract and their antibacterial activity
Autorzy:
Anandh, B.
Muthuvel, A.
Emayavaramban, M.
Powiązania:
https://bibliotekanauki.pl/articles/412277.pdf
Data publikacji:
2014
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
green synthesis
silver nanoparticles
Lagenaria siceraria
antibacteriala activity
Opis:
The present investigation demonstrates the formation of silver nanoparticles by the reduction of the aqueous silver metal ions during exposure to the Lagenaria siceraria leaf extract. The synthesized AgNPs have characterized by UV-visible spectroscopy, X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FT-IR) techniques. AgNPs formation has screened by UV-visible spectroscopy through colour conversion due to surface plasma resonance band at 427 nm. X-ray diffraction (XRD) confirmed that the resulting AgNPs are highly crystalline and the structure is face centered cubic (fcc). FT-IR spectrum indicates the presence of different functional groups present in the biomolecules capping the nanoparticles. Further, inhibitory activity of AgNPs and leaf extract were tested against human pathogens like gram-pastive (Staphylococcus aureus, Bacillus subtilis), gram-negative (Escherichia coli and Pseudomonas aeruginosa). The results indicated that the AgNPs showed moderate inhibitory actions against human pathogens than Lagenaria siceraria leaf extract, demonstrating its antimicrobial value against pathogenic diseases.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2014, 19, 1; 35-45
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synthesis of silver nanoparticles by aqueous extract of Zingiber officinale and their antibacterial activities against selected species
Autorzy:
Hussain, Zawar
Jahangeer, Muhammad
ur Rahman, Shafiq
Ihsan, Tamanna
Sarwar, Abid
Ullah, Najeeb
Aziz, Tariq
Alharbi, Metab
Alshammari, Abdulrahman
Alasmari, Abdullah F.
Powiązania:
https://bibliotekanauki.pl/articles/27315653.pdf
Data publikacji:
2023
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
Nanotechnology
Antibacterial activity
Silver-nanoparticles
green synthesis
Ginger
Opis:
Silver nanoparticles have special plasmonic and antibacterial characteristics that make them efficient in a variety of commercial medical applications. According to recent research, chemically synthesized silver nanoparticles are harmful even in low concentrations. It was crucial to identify appropriate synthesis methods that may have low costs and be nontoxic to the environment. Zingiber officinale (ginger) extracts used to prepare silver nanoparticles were inexpensive and environmentally friendly, and the best physicochemical characteristics were analyzed. Silver nanoparticles were characterized by using UV-visible spectroscopy, Scanning electron microscopy (SEM), and X-ray diffraction (XRD). The surface Plasmon resonance peak at 425 nm was observed using UV-Visible spectroscopy. Scanning electron microscopy observed that the nanoparticles were spherical and ranged in size from 5 to 35 nm. The XRD pattern values of 2θ: 38.2° , 46.3° , and 64.58° are used to determine the planes (111), (200), and (220). The silver nanoparticle’s existence was verified by the face-centered cubic (FCC). Silver nanoparticles were found to have antibacterial efficacy against gram-positive Staphylococcus and gram-negative bacteria such as Pseudomonas aeruginosa, Klebsiella Aerogenes, Salmonella, Staphylococcus and Escherichia coli. The antibacterial activity of silver nanoparticles was observed using the agar well diffusion (AWD) method at three different concentrations (100 μg/ ml, 75 μg/ml, and 50 μg/ml). The zone of inhibition measured against the bacterial strains pseudomonas Aeruginosa, Klebsiella aerogenes, Escherichia coli, Salmonella and Staphylococcus which were (18.4±1.25 mm, 16.9±0.74 mm, 14.8±1.25 mm), (16.8±0.96 mm, 14.6±0.76 mm, 14.0±1.15 mm), (19.7±0.76 mm, 18.2±0.66 mm, 15.4±1.15 mm), (16.6±0.67 mm, 14.2±0.23 mm, 12.8±0.78 mm) and (12±0.68 mm, 10±0.20 mm, 08±0.15 mm). These nanoparticles’ potent antibacterial properties may enable them to be employed as nanomedicines for a variety of gramnegative bacterial illness treatments.
Źródło:
Polish Journal of Chemical Technology; 2023, 25, 3; 23--30
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Otrzymywanie nanocząstek srebra pokrywanych polialdehydo-dekstranem
Preparation of polialdehyde-dextrane coated silver nanopaticles
Autorzy:
Wasiak, I.
Ciach, T.
Powiązania:
https://bibliotekanauki.pl/articles/284558.pdf
Data publikacji:
2011
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Tematy:
nanocząstki srebra
polialdehydo-dekstran
silver nanoparticles
polyaldehyde-dextran
Opis:
Prezentowane badania opisują prace doświadczalne nad nanocząstkami srebra otrzymywanymi poprzez redukcję jonów srebra za pomocą pochodnej dekstranu w roztworze wodnym. W przedstawionej metodzie wykorzystano polialdehydo-dekstran jako czynnik redukujący i ochronny, a także jako ligand umożliwiający funkcjonalizację otrzymanych nanocząstek. Zbadano między innymi wpływ czasu reakcji i masy cząsteczkowej polialdehydo-dekstranu na charakterystyczne parametry nanoczastek. Otrzymane nanocząstki poddano badaniom z zastosowaniem Nanosight i SEM, oraz wykonano analizę widma UV-Vis. Opisaną metodą uzyskano nanocząstki o średnicy mniejszej niż 100 nm o stosunkowo wąskim rozkładzie średnic. Otrzymaną średnicę nanocząstek można kontrolować przez czas reakcji i zastosowane stężenie polialdehydo-dekstranu.
Presented study describes the experimental work on silver nanoparticles production by the reduction of solver ions by dextran derivative in water solution. In the presented method we used polyaldehyde-dextran as a reductive and protective agent and also a functionalisation ligand. The influence of process parameters i.e. the reaction time and molecular weight of polyaldehyde-dextran on the characteristic parameters of nanoparticles was evaluated. Particles were characterized by Nanosight and SEM, their UV–Vis spectroscopic absorption properties were also determined. Nanoparticles with diameter less than 100nm with relatively narrow size distribution were obtained. We found that the diameters of nanoparticles can be control by the reaction time and applied polyaldehyde-dextran concentration.
Źródło:
Engineering of Biomaterials; 2011, 14, no. 106-108; 172-176
1429-7248
Pojawia się w:
Engineering of Biomaterials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Photocatalytic degradation of ampicillin using silver nanoparticles biosynthesised by Pleurotus ostreatus
Autorzy:
Jassal, P.S.
Khajuria, R.
Sharma, R.
Debnath, P.
Verma, S.
Johnson, A.
Kumar, S.
Powiązania:
https://bibliotekanauki.pl/articles/2096973.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
ampicillin
FTIR
photocatalysis
silver nanoparticles (Ag-NPs)
TEM
Opis:
The past few decades have witnessed a tremendous increase in the consumption of antibiotics worldwide. This rampant and unregulated use of antibiotics and their improper disposal has led to the accumulation of these drugs in the environment. This in turn has led to the emergence of antibiotic resistance in microbes and has become one of the most pressing global concerns in medicine, with highly resistant pathogens of many species proving difficult to treat. The aim of the study was to synthesise silver nanoparticles (Ag-NPs) using white rot fungus, Pleurotus ostreatus and assess its potential to carry out photocatalytic degradation of ampicillin. UV–Vis spectroscopy, Fourier transform infrared spectroscopy and transmission electron microscope have been used to characterize biosynthesized Ag-NPs. The photocatalytic degradation of ampicillin in aqueous solution by Ag-NPs was evaluated under natural sunlight. The effect of the operating conditions (contact time, Ag-NP concentration and initial ampicillin concentration) on the photocatalytic degradation was also investigated. The highest ampicillin degradation of 96.5% was observed after exposure of the solution (antibiotic + nanoparticles) for 4 h in sunlight. The maximum degradation was observed at an Ag-NP concentration of 5 ppm at pH 6. To the best of our knowledge, photocatalytic degradation of ampicillin using Ag-NPs synthesised by P. ostreatus has not been reported earlier.
Źródło:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology; 2020, 101, 1; 5-14
0860-7796
Pojawia się w:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Green synthesis, characterization and antibacterial activities of silver nanoparticles from strawberry fruit extract
Autorzy:
Umoren, S. A.
Nzila, A. M.
Sankaran, S.
Solomon, M. M.
Umoren, P. S.
Powiązania:
https://bibliotekanauki.pl/articles/779869.pdf
Data publikacji:
2017
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
strawberry fruit
silver nanoparticles
biosynthesis
characterization
antibacterial activity
Opis:
Silver nanoparticles (AgNPs) have been synthesized in the presence of Strawberry fruit extract (SBFE) at room temperature. The synthesized AgNPs was characterized by UV-vis spectroscopy, SEM, EDS, XRD, TEM and FTIR. The UV-vis spectra of the AgNPs show SPR band at 450 nm. TEM results indicate that AgNPs are spherical in shape and size range between 7–65 nm. Antibacterial activity of the synthesized AgNPs has been assessed against Pseudomonas aeruginosa and Bacillus licheniformis. The results show that AgNPs exhibit inhibitory effect and effect is a function of AgNPs concentration. The antibacterial activity of the prepared AgNPs has been compared with two antibiotics, amoxicillin and ciprofloxacin. It is found that the antibiotics perform better than AgNPs.
Źródło:
Polish Journal of Chemical Technology; 2017, 19, 4; 128-136
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Nonwoven chitosan - preparation and properties
Autorzy:
Wawro, Dariusz
Stęplewski, Włodzimierz
Marcol, Wiesław
Skrzetuska, Ewa
Krucińska, Izabella
Powiązania:
https://bibliotekanauki.pl/articles/1034221.pdf
Data publikacji:
2019
Wydawca:
Sieć Badawcza Łukasiewicz - Polskie Towarzystwo Chitynowe
Tematy:
chitosan staple fibres
mechanical properties
nonwovens
silver nanoparticles
Opis:
This article focuses on preliminary investigations of the manufacture of nonwoven chitosan from a 38-mm chitosan staple fibre and fibres containing silver nanoparticles. The nonwoven chitosan is built of several needle-punched layers of fleece, with a lengthwise arrangement of chitosan fibres. Estimated were mechanical and sorption properties, apparent density, thickness and air permeability of the nonwoven chitosan.
Źródło:
Progress on Chemistry and Application of Chitin and its Derivatives; 2019, 24; 183-191
1896-5644
Pojawia się w:
Progress on Chemistry and Application of Chitin and its Derivatives
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The effect of hydroxyapatite coating with silver nanoparticles on osseointegration of titanium implants
Autorzy:
Sulej-Chojnacka, Joanna
Woźniak, Waldemar
Andrzejewski, Daniel
Powiązania:
https://bibliotekanauki.pl/articles/1844985.pdf
Data publikacji:
2020
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Tematy:
implant
hydroxyapatite
Ti6Al4V
silver nanoparticles
Opis:
During the implantation surgery, an infection associated with the biofilm formation may occur. Both the type of the introduced material as well as the implant osseointegration largely determine the effectiveness of bone defect treatment. The materials research is increasingly focusing on improving the osseointegration process. A bacterial biofilm can form on any surface of the artificial organ that has been introduced into the body or surrounding tissues. A bacterial infection is one of the most serious complications of implantology surgery leading to serious physiological damage. As proved in the literature, a solution that can prevent bacterial infections is to modify the implant surface by applying an antibacterial coating, while maintaining the material biocompatibility. The article presents the tests results of prototype implants with hydroxyapatite coatings obtained via plasma spraying on titanium surfaces. The resulting coatings were enriched with silver nanoparticles, the content of which was about 2%. The animal model are New Zealand rabbits. The implants were placed in the femur of the animal. The amount of released ions and the force of pulling the implants from the bone were determined. The binding strength between the joint surface and the implant was determined by the mechanical blocking and biological binding of growing bone tissue. In addition, the surface structure of the obtained implants was evaluated. It has been shown that the surface modification of the implants affected the obtained stabilization value, as compared to the implants surface coated only with hydroxyapatite.
Źródło:
Engineering of Biomaterials; 2020, 23, 154; 9-15
1429-7248
Pojawia się w:
Engineering of Biomaterials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Antimicrobial efficacy of mixtures of silver nanoparticles and polyhydric alcohols against health-promoting bacteria
Autorzy:
Czernel, G.
Wasko, A.
Gustaw, K.
Kaminski, D.M.
Matwijczuk, A.P.
Nowicka, A.
Matwijczuk, A.S.
Oniszczuk, T.
Arczewska, M.
Karcz, D.
Powiązania:
https://bibliotekanauki.pl/articles/2082604.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:
silver nanoparticles
antimicrobial effect
healthpromoting
bacteria
polyhydric alcohols
packaging
Opis:
In the present study, the effectiveness of a mixture of silver nanoparticles with polyhydric alcohols (glycerol, erythritol, mannitol and xylitol) against six species of healthpromoting bacteria have been examined. Synthesis of silver nanoparticles was carried out using trisodium citrate as the reducing and stabilizing agent. The nanoparticles were characterized by electronic absorption, scanning electron microscopy and powder X-ray diffraction measurements. Electronic absorption spectrum revealed high uniform of synthesized nanoparticles. Practically no aggregation was observed when nanoparticles were mixed with polyhydric alcohols, suggesting weak interaction between ingredients of the mixture. Spherical silver nanoparticles, as depicted by scanning electron microscopy, were found to have diameters in the range of 10 to 30 nm; mean diameter was 18 ± 4 nm. The X-ray diffraction pattern of the prepared samples indicated the face-centred cubic crystalline structure of the metallic silver nanoparticles. In biological study, quite interesting protective effect of polyalcohols on the growth inhibition of health-promoting bacteria by silver nanoparticles was observed. The most substantial protective effect of the tested silver nanoparticles-polyalcohol mixtures was estimated for B. bifidum, L. paraplantarum, and L. phamnosus species.
Źródło:
International Agrophysics; 2019, 33, 4; 473-480
0236-8722
Pojawia się w:
International Agrophysics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The effect of hydroxyapatite coating with silver nanoparticles on osseointegration of titanium implants
Autorzy:
Sulej-Chojnacka, Joanna
Woźniak, Waldemar
Andrzejewski, Daniel
Powiązania:
https://bibliotekanauki.pl/articles/283743.pdf
Data publikacji:
2020
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Tematy:
implant
hydroxyapatite
Ti6Al4V
silver nanoparticles
Opis:
During the implantation surgery, an infection associated with the biofilm formation may occur. Both the type of the introduced material as well as the implant osseointegration largely determine the effectiveness of bone defect treatment. The materials research is increasingly focusing on improving the osseointegration process. A bacterial biofilm can form on any surface of the artificial organ that has been introduced into the body or surrounding tissues. A bacterial infection is one of the most serious complications of implantology surgery leading to serious physiological damage. As proved in the literature, a solution that can prevent bacterial infections is to modify the implant surface by applying an antibacterial coating, while maintaining the material biocompatibility. The article presents the tests results of prototype implants with hydroxyapatite coatings obtained via plasma spraying on titanium surfaces. The resulting coatings were enriched with silver nanoparticles, the content of which was about 2%. The animal model are New Zealand rabbits. The implants were placed in the femur of the animal. The amount of released ions and the force of pulling the implants from the bone were determined. The binding strength between the joint surface and the implant was determined by the mechanical blocking and biological binding of growing bone tissue. In addition, the surface structure of the obtained implants was evaluated. It has been shown that the surface modification of the implants affected the obtained stabilization value, as compared to the implants surface coated only with hydroxyapatite.
Źródło:
Engineering of Biomaterials; 2020, 23, 154; 9-15
1429-7248
Pojawia się w:
Engineering of Biomaterials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Ability of Rhizopus stolonifer MR11 to Biosynthesize Silver Nanoparticles in Response to Various Culture Media Components and Optimization of Process Parameters Required at Each Stage of Biosynthesis
Autorzy:
Khleifat, Khaled
Alqaraleh, Moath
Al-limoun, Muhamad
Alfarrayeh, Ibrahim
Khatib, Rasha
Qaralleh, Haitham
Alsarayreh, Ahmad
Al Qaisi, Yaseen
Hajleh, Maha Abu
Powiązania:
https://bibliotekanauki.pl/articles/2173339.pdf
Data publikacji:
2022
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
nanotechnology
silver nanoparticles
Rhizopus stolonifer MR11
optimization
characterization
Opis:
One of the most important roles for nanotechnology concerns is the development of optimizable experimental protocols for nanomaterials synthesis. The formation of silver nanoparticles (AgNPs) was supported by Rhizopus stolonifer MR11, which was isolated from olive oil mill soil samples. The ability of R. stolonifer MR11 to biosynthesize silver nanoparticles in response to various components of different culture media was tested. Furthermore, the conditions under which the reducing biomass filtrate was obtained, as well as the conditions of the bio-reduction reaction of AgNO3 into AgNPs, were investigated. The fungal biomass filtrate of the strain Rhizopus stolonifer MR11 was capable of converting silver nitrate into AgNPs, as evidenced by the color change of the fungal filtrates. UV-Vis spectrophotometer, TEM, Zeta potential, Zeta sizer, FT-IR, and XRD analyses were used to characterize the AgNPs. TEM analysis revealed that the silver nanoparticles were 1–35 nm in size. R. stolonifer MR11 produced the maximum AgNPs when grown for 18 hours at 36 °C in media with starch and yeast extract as the sole carbon and nitrogen sources, respectively. The reducing biomass filtrate was obtained by incubating 5 g mycelial biomass in deionized water with a pH of 6 for 48 hours at 30 °C. The optimal reduction conditions of the biosynthesis reaction were determined by adding 1.0 mM AgNO3 to a pH 5 buffered mycelial filtrate and incubating it for 72 hours at 33 °C. The current study’s findings highlighted the importance of process parameters at each stage for optimal AgNPs biosynthesis.
Źródło:
Journal of Ecological Engineering; 2022, 23, 8; 89--100
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Nanocząstki w zastosowaniach medycznych – kierunek przyszłości?
Nanoparticles in medical applications – a direction of the future?
Autorzy:
Jung, Anna
Powiązania:
https://bibliotekanauki.pl/articles/1033080.pdf
Data publikacji:
2014
Wydawca:
Medical Communications
Tematy:
grafen
graphene
nanocomposites
nanocząstki
nanocząstki srebra
nanokompozyty
nanoparticles
nanotechnologie
nanotechnologies
silver nanoparticles
Opis:
Methods of producing nanoparticles, called nanotechnologies, have inspired lively interest over the recent years due to the broad possibilities for application of nanoparticles in numerous fields, including electronics, information technology, biotechnology, medicine, pharmacy, cosmetology and others. Nanoparticles are defined as particles which may occur in various shapes and which have at least one dimension smaller than 100 nm. Depending on the process of creation we can differentiate between natural nanoparticles occurring in the environment and designed nanoparticles, which are man-made. Designed nanoparticles are characterised by special physical properties which make them suitable for biomedical applications, among others. An example of such an application is the use of silver nanocomposites, which in a micronised form display a strong bacteriostatic and bactericidal effect. Graphene, the latest achievement of nanotechnology with unique mechanical and physical properties, is another material which raises much interest among researchers. The dynamic development of numerous directions in modern technologies based on nanotechnologies is an indisputable sign of progress. The discovery of the unique properties of nanomaterials opens wide possibilities for numerous applications; however, it also requires comprehensive research to ensure they are safe to use.
Metody wytwarzania nanocząstek, zwane nanotechnologiami, wzbudzają w ostatnich latach żywe zainteresowanie dzięki szerokim możliwościom zastosowania ich produktów w wielu dziedzinach, w tym w elektronice, informatyce, biotechnologii, medycynie, farmacji, kosmetologii i innych. Nanocząstki są definiowane jako cząstki, które mogą występować w różnych kształtach i których przynajmniej jeden z wymiarów jest mniejszy niż 100 nm. W zależności od procesu powstawania wyróżnia się nanocząstki naturalne, występujące w środowisku, oraz nanocząstki projektowane, będące wytworem działalności człowieka. Nanocząstki projektowane cechują szczególne właściwości fizyczne, które między innymi warunkują ich zastosowanie biomedyczne. Przykładem może być zastosowanie nanokompozytów srebra, które w postaci zmikronizowanej wykazują silne działanie bakteriostatyczne i bakteriobójcze. Duże zainteresowanie badaczy wzbudza również grafen, najnowsze dzieło nanotechnologii, posiadający unikalne właściwości mechaniczne i fizyczne. Dynamiczny rozwój wielu kierunków nowoczesnych technologii opartych na nanotechnologiach jest niewątpliwym wyznacznikiem postępu. Odkrycie unikalnych właściwości nanomateriałów otwiera szerokie możliwości wielu zastosowań, ale jednocześnie wymaga kompleksowych badań zapewniających bezpieczeństwo ich użytkowania.
Źródło:
Pediatria i Medycyna Rodzinna; 2014, 10, 2; 104-110
1734-1531
2451-0742
Pojawia się w:
Pediatria i Medycyna Rodzinna
Dostawca treści:
Biblioteka Nauki
Artykuł
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