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https://www.readbyqxmd.com/read/28925873/silver-nanoparticles-with-high-loading-capacity-of-amphotericin-b-characterization-bactericidal-and-antifungal-effects
#1
Victoria Leonhard, Roxana Valeria Alasino, Adrián Muñoz, Dante Miguel Beltramo
The purpose of this study was to evaluate the most appropriate conditions to generate silver nanoparticles (AgNPs) loaded with a potent antimycotic drug like amphotericin B (AmB), characterize the physicochemical properties, and also evaluate the cytotoxic effect and biological activity of these new nanostructures as a potential nanocarrier for hydrophobic drugs. It was determined that the optimal molar ratio between Ag and AmB is 1/1 given the uniformity of size around 1750 nm of the nanoparticles generated as well as their strongly negative ζ potential of -27 mV, a condition that favors repulsions between AgNPs and inhibiting their aggregation...
September 18, 2017: Current Drug Delivery
https://www.readbyqxmd.com/read/28923599/-theranostic-role-of-bile-salt-capped-silver-nanoparticles-gall-stone-pigment-stone-disruption-and-anticancer-activity
#2
Ranju Prasad Mandal, Gunjan Mandal, Sudeshna Sarkar, Arindam Bhattacharyya, Swati De
Silver nanoparticles (AgNPs) have been synthesized in situ in micelles formed by the bile salt sodium deoxycholate (NaDC). The AgNPs exhibit "green" fluorescence. It has been shown in the present study that they can disrupt the components of gall stones/pigment stones. This unique ability of the AgNPs has been observed upon detailed study of the interaction between the endobiotic pigment bilirubin (BR) and bile salt (NaDC). In addition, these AgNPs show significant cytotoxicity towards the breast cancer cells (MCF-7)...
September 5, 2017: Journal of Photochemistry and Photobiology. B, Biology
https://www.readbyqxmd.com/read/28922669/a-critical-commentary-on-the-2017-agnp-consensus-guidelines-for-therapeutic-drug-monitoring-in-neuropsychopharmacology
#3
Jose de Leon
In 2004, 2011, and 2017, the Arbeitsgemeinschaft für Neuropsychopharmakologie und Pharmakopsychiatrie (AGNP), a group of German-speaking psychiatric researchers and psychiatrists, published successive versions of therapeutic drug monitoring (TDM) expert group consensus guidelines. The 2017 version has as a major strength its encyclopedic nature, including 1358 references. The guideline has 3 major sections: 1) theoretical aspects of TDM, 2) drug concentration levels in blood to guide neuropsychopharmacotherapy, and 3) practical aspects of TDM in psychiatry and neurology...
September 18, 2017: Pharmacopsychiatry
https://www.readbyqxmd.com/read/28922597/core-shell-silver-nanoparticles-in-endodontic-disinfection-solutions-enable-long-term-antimicrobial-effect-on-oral-biofilms
#4
Elif Ertem Bekdemir, Beatrice Gutt, Flavia Zuber, Sergio Allegri, Benjamin Le Ouay, Selma Mefti, Kitty Formentin, Francesco Stellacci, Qun Ren
To achieve effective long-term disinfection of the root canals, we synthesized core-shell silver nanoparticles (AgNPs@SiO2) and used them to develop two irrigation solutions containing sodium phytate (SP) and ethylene glycol-bis(β-aminoethyl ether)-N,N,N',N'-tetraacetic acid (EGTA), respectively. Ex vivo studies with instrumented root canals revealed that the developed irrigation solutions can effectively remove the smear layer from the dentinal surfaces. Further in vitro experiments with single and multi-species biofilms demonstrated for the first time that AgNPs@SiO2 based irrigation solutions possess excellent antimicrobial activities for at least 7 days, whereas the bare AgNPs lose the activity almost immediately and do not show any antibacterial activity after 2 days...
September 18, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28922508/single-oxidative-collision-events-of-silver-nanoparticles-understanding-the-rate-determining-chemistry
#5
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) 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/28920592/in-situ-synthesis-of-au-shelled-ag-nanoparticles-on-pdms-for-flexible-long-life-and-broad-spectrum-sensitive-sers-substrates
#6
B Fortuni, T Inose, S Uezono, S Toyouchi, K Umemoto, S Sekine, Y Fujita, M Ricci, G Lu, A Masuhara, J A Hutchison, L Latterini, H Uji-I
A simple and fast one-step fabrication method of silver nanoparticles (AgNPs) on a polydimethylsiloxane (PDMS) film and their improvement as highly sensitive surface enhanced Raman scattering (SERS) substrates via atomically thin Au coatings is demonstrated. The thin Au layer provides oxidation resistivity while maintaining the broad spectral range SERS sensitivity of Ag nanoparticles.
September 18, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28919753/combination-of-graphene-oxide-silver-nanoparticle-nanocomposites-and-cisplatin-enhances-apoptosis-and-autophagy-in-human-cervical-cancer-cells
#7
Yu-Guo Yuan, Sangiliyandi Gurunathan
BACKGROUND: Cisplatin (Cis) is a widely used chemotherapeutic drug for treating a variety of cancers, due to its ability to induce cell death in cancer cells significantly. Recently, graphene and its modified nanocomposites have gained much interest in cancer therapy, due to their unique physicochemical properties. The objective of this study was to investigate the combination effect of Cis and a reduced graphene oxide-silver nanoparticle nanocomposite (rGO-AgNPs) in human cervical cancer (HeLa) cells...
2017: International Journal of Nanomedicine
https://www.readbyqxmd.com/read/28919750/silver-nanoparticles-enhance-the-apoptotic-potential-of-gemcitabine-in-human-ovarian-cancer-cells-combination-therapy-for-effective-cancer-treatment
#8
Yu-Guo Yuan, Qiu-Ling Peng, Sangiliyandi Gurunathan
BACKGROUND: Gemcitabine (GEM) is widely used as an anticancer agent in several types of solid tumors. Silver nanoparticles (AgNPs) possess unique cytotoxic features and can induce apoptosis in a variety of cancer cells. In this study, we investigated whether the combination of GEM and AgNPs can exert synergistic cytotoxic effects in the human ovarian cancer cell line A2780. METHODS: We synthesized AgNPs using resveratrol as a reducing and stabilizing agent. The synthesized nanomaterials were characterized using various analytical techniques...
2017: International Journal of Nanomedicine
https://www.readbyqxmd.com/read/28919741/extracellular-biosynthesis-of-silver-nanoparticles-using-the-cell-free-filtrate-of-nematophagous-fungus-duddingtonia-flagrans
#9
Laryssa Pinheiro Costa Silva, Jairo Pinto Oliveira, Wanderson Juvencio Keijok, André Romero da Silva, Anderson Rocha Aguiar, Marco Cesar Cunegundes Guimarães, Carolina Magri Ferraz, Jackson Victor Araújo, Fernando Luiz Tobias, Fábio Ribeiro Braga
The biosynthesis of metallic nanoparticles (NPs) using biological systems such as fungi has evolved to become an important area of nanobiotechnology. Herein, we report for the first time the extracellular synthesis of highly stable silver NPs (AgNPs) using the nematophagous fungus Duddingtonia flagrans (AC001). The fungal cell-free filtrate was analyzed by the Bradford method and 3,5-dinitrosalicylic acid assay and used to synthesize the AgNPs in the presence of a 1 mM AgNO3 solution. They have been characterized by UV-Vis spectroscopy, X-ray diffraction, transmission electron microscopy, dynamic light scattering, Zeta potential measurements, Fourier-transform infrared, and Raman spectroscopes...
2017: International Journal of Nanomedicine
https://www.readbyqxmd.com/read/28917747/colorimetric-detection-of-ammonia-using-smartphones-based-on-localized-surface-plasmon-resonance-of-silver-nanoparticles
#10
Amirmostafa Amirjani, Davoud Haghshenas Fatmehsari
In this work, a rapid and straightforward method was developed for colorimetric determination of ammonia using smartphones. The mechanisms is based on the manipulation of the surface plasmon band of silver nanoparticles (AgNPs) via the formation of Ag (NH3)2(+) complex. This complex decreases the amount of AgNPs in the solution and consequently, the color intensity of the colloidal system decreases. Not only the variation in color intensity of the solution can be tracked by a UV-vis spectrophotometer, but also a smartphone can be employed to monitor the color intensity variation by RGB analysis...
January 1, 2018: Talanta
https://www.readbyqxmd.com/read/28911618/green-synthesis-of-silver-nanoparticles-using-onion-extract-and-their-application-for-the-preparation-of-a-modified-electrode-for-determination-of-ascorbic-acid
#11
Mohammad A Khalilzadeh, Mina Borzoo
A high-quality method for one-pot biosynthesis of silver nanoparticles (AgNPs) using onion extracts as reductant and stabilizer is reported. The synthesized AgNPs were characterized by ultraviolet-visible spectroscopy (UV-Vis), X-ray powder diffraction (XRD), and transmission electron microscopy (TEM). UV-Vis spectroscopy results showed that the AgNP absorption band was located at a peak of 397 nm in aqueous solution. Both XRD and TEM results confirmed that the AgNPs were mainly spherical with average diameters of 6...
October 2016: Journal of Food and Drug Analysis
https://www.readbyqxmd.com/read/28910830/consensus-guidelines-for-therapeutic-drug-monitoring-in-neuropsychopharmacology-update-2017
#12
C Hiemke, N Bergemann, H W Clement, A Conca, J Deckert, K Domschke, G Eckermann, K Egberts, M Gerlach, C Greiner, G Gründer, E Haen, U Havemann-Reinecke, G Hefner, R Helmer, G Janssen, E Jaquenoud, G Laux, T Messer, R Mössner, M J Müller, M Paulzen, B Pfuhlmann, P Riederer, A Saria, B Schoppek, G Schoretsanitis, M Schwarz, M Silva Gracia, B Stegmann, W Steimer, J C Stingl, M Uhr, S Ulrich, S Unterecker, R Waschgler, G Zernig, G Zurek, P Baumann
Therapeutic drug monitoring (TDM) is the quantification and interpretation of drug concentrations in blood to optimize pharmacotherapy. It considers the interindividual variability of pharmacokinetics and thus enables personalized pharmacotherapy. In psychiatry and neurology, patient populations that may particularly benefit from TDM are children and adolescents, pregnant women, elderly patients, individuals with intellectual disabilities, patients with substance abuse disorders, forensic psychiatric patients or patients with known or suspected pharmacokinetic abnormalities...
September 14, 2017: Pharmacopsychiatry
https://www.readbyqxmd.com/read/28910572/silver-nanoparticles-toxicity-against-airborne-strains-of-staphylococcus-spp
#13
Katarzyna A Wolny-Koładka, Dagmara K Malina
The aim of this study was to explore the toxicity of silver nanoparticles (AgNPs) synthesized by chemical reduction method assessment with regard to airborne strains of Staphylococcus spp. The first step of the experiment was the preparation of silver nanoparticle suspension. The suspension was obtained by a fast and simple chemical method involving the reduction of silver ions through a reducing factor in the presence of the suitable stabilizer required to prevent the aggregation. In the second stage, varied instrumental techniques were used for the analysis and characterization of the obtained nanostructures...
September 14, 2017: Journal of Environmental Science and Health. Part A, Toxic/hazardous Substances & Environmental Engineering
https://www.readbyqxmd.com/read/28898803/cytotoxic-effects-of-commonly-used-nanomaterials-and-microplastics-on-cerebral-and-epithelial-human-cells
#14
Gabriella F Schirinzi, Ignacio Pérez-Pomeda, Josep Sanchís, Cesare Rossini, Marinella Farré, Damià Barceló
Plastic wastes are among the major inputs of detritus into aquatic ecosystems. Also, during recent years the increasing use of new materials such as nanomaterials (NMs) in industrial and household applications has contributed to the complexity of waste mixtures in aquatic systems. The current effects and the synergism and antagonisms of mixtures of microplastics (MPLs), NMs and organic compounds on the environment and in human health have, to date, not been well understood but instead they are a cause for general concern...
September 9, 2017: Environmental Research
https://www.readbyqxmd.com/read/28898784/variable-silver-nanoparticle-toxicity-to-daphnia-in-boreal-lakes
#15
Andrea L Conine, Daniel C Rearick, Marguerite A Xenopoulos, Paul C Frost
Variable sensitivity of organisms to silver nanoparticles (AgNPs) caused by changes in physico-chemical variables in aquatic ecosystems is receiving increasing attention. Variables such as dissolved organic carbon, pH, light, the presence of algae and bacteria, dissolved oxygen and different ions have all been studied individually, but it is still unclear how these variables in combination alter AgNP toxicity in natural ecosystems. Here we examined AgNP toxicity on survival of wild-caught Daphnia using AgNP suspensions placed in water from several different lakes at the IISD-Experimental Lakes Area, which span a gradient of water quality parameters...
September 6, 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/28893613/genotoxic-effects-in-transformed-and-non-transformed-human-breast-cell-lines-after-exposure-to-silver-nanoparticles-in-combination-with-aluminium-chloride-butylparaben-or-di-n-butylphthalate
#16
J Roszak, K Domeradzka-Gajda, A Smok-Pieniążek, A Kozajda, S Spryszyńska, J Grobelny, E Tomaszewska, K Ranoszek-Soliwoda, M Cieślak, D Puchowicz, M Stępnik
In the present study genotoxic effects after combined exposure of human breast cell lines (MCF-10A, MCF-7 and MDB-MB-231) to silver nanoparticles (AgNP, citrate stabilized, 15 and 45nm by STEM, Ag15 and Ag45, respectively) with aluminium chloride, butylparaben, or di-n-butylphthalate were studied. In MCF-10A cells exposed for 24h to Ag15 at the concentration of 23.5μg/mL a statistically significant increase in DNA damage in comet assay (SSB) was observed. In the presence of the test chemicals the genotoxic effect was decreased to a level comparable to control values...
September 8, 2017: Toxicology in Vitro: An International Journal Published in Association with BIBRA
https://www.readbyqxmd.com/read/28892865/size-characterization-of-silver-nanoparticles-after-separation-from-silver-ions-in-environmental-water-using-magnetic-reduced-graphene-oxide
#17
Li Luo, Yuan Yang, Haipu Li, Ru Ding, Qiang Wang, Zhaoguang Yang
This study involved the synthesis of magnetic reduced graphene oxide (M-rGO) using a co-precipitation method and examined its resultant adsorption properties for mixtures containing silver ions and silver nanoparticles (AgNPs). The results indicate that M-rGO preferentially adsorbs silver ions in mixtures containing AgNPs, enabling the size characterization of smaller AgNPs (<60nm) at ultra-trace concentration levels to be more attainable. The sorbents after adsorption could be easily recovered through an external magnet...
September 7, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28891756/evaluation-of-distribution-redox-parameters-and-genotoxicity-in-wistar-rats-co-exposed-to-silver-and-titanium-dioxide-nanoparticles
#18
Airton da Cunha Martins, Lara Ferreira Azevedo, Cecília Cristina de Souza Rocha, Maria Fernanda Hornos Carneiro, Vinicius Paula Venancio, Mara Ribeiro de Almeida, Lusânia Maria Greggi Antunes, Rodrigo de Carvalho Hott, Jairo Lisboa Rodrigues, Abayomi T Ogunjimi, Joseph A Adeyemi, Fernando Barbosa
The increasing production of silver nanoparticles (AgNPs) and titanium dioxide nanoparticles (TiO2NPs) has resulted in their elevated concentrations in the environment. This study was, therefore, aimed at determining the distribution, redox parameters, and genotoxic effects in male Wistar rats that were treated with either AgNP or TiO2NP individually, as well as under a co-exposure scenario. Animals were exposed via oral gavage to either sodium citrate buffer (vehicle), 0.5 mg/kg/day TiO2NP, 0.5 mg/kg/day AgNP or a mixture of TiO2NPs and AgNPs...
September 11, 2017: Journal of Toxicology and Environmental Health. Part A
https://www.readbyqxmd.com/read/28886554/dependence-of-toxicity-of-silver-nanoparticles-on-pseudomonas-putida-biofilm-structure
#19
Pumis Thuptimdang, Tawan Limpiyakorn, Eakalak Khan
Susceptibility of biofilms with different physical structures to silver nanoparticles (AgNPs) was studied. Biofilms of Pseudomonas putida KT2440 were formed in batch conditions under different carbon sources (glucose, glutamic acid, and citrate), glucose concentrations (5 and 50 mM), and incubation temperatures (25 and 30 °C). The biofilms were observed using confocal laser scanning microscopy for their physical characteristics (biomass amount, thickness, biomass volume, surface to volume ratio, and roughness coefficient)...
September 1, 2017: Chemosphere
https://www.readbyqxmd.com/read/28886426/synthesis-characterization-and-evaluation-cytotoxic-activity-of-silver-nanoparticles-synthesized-by-chinese-herbal-cornus-officinalis-via-environment-friendly-approach
#20
Yangqing He, Xing Li, Ju Wang, Qian Yang, Binghua Yao, Yingjuan Zhao, Aiming Zhao, Wenxing Sun, Qian Zhang
Cornus officinalis has been widely used as a precious herb and as the tonic food to improve kidney function in China. Its fruits have been used in many traditional Chinese medicine prescriptions to treat kidney diseases, diabetes, cancer and shock. In this study, a new eco-friendly approach for green synthesis of silver nanoparticles (AgNPs) by using the fruits of Cornus officinalis aqueous extract as a reducing and stabilizing agent. The so-synthesized AgNPs showed quasi-spherical in shape with uniform dispersal and an average mean size of 11...
September 1, 2017: Environmental Toxicology and Pharmacology
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