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https://www.readbyqxmd.com/read/28317763/effect-of-organic-additives-on-silver-release-from-nanosilver-polyethylene-composite-films-to-acidic-food-simulant
#1
Qi-Zhi Su, Qin-Bao Lin, Chao-Fang Chen, Li-Bing Wu, Zhi-Wei Wang
The effects of organic additives (Irgafos 168, Irganox 1076, Tinuvin 622, Chimassorb 944, UV-P, and UV-531) on silver release from nanosilver-polyethylene composite films into an acidic food simulant (3% acetic acid) were investigated using inductively coupled plasma mass spectrometry. The limits of detection and quantification, coefficient of determination, and recoveries of the method used were 3.7ngL(-1), 12.4ngL(-1), 0.999, and 89-113%, respectively. The results indicated that additives can affect silver release via two simultaneous processes: (i) reactions between organic additives and silver that promote silver release from the composite film to the acidic food simulant; and (ii) the promotion or inhibition of silver release by affecting silver oxidation...
August 1, 2017: Food Chemistry
https://www.readbyqxmd.com/read/28258260/antimicrobial-efficacy-of-mixtures-of-nanosilver-and-zinc-oxide-eugenol-against-enterococcus-faecalis
#2
Roza Haghgoo, Motahareh Ahmadvand, Mohammad Nyakan, Mojtaba Jafari
AIM: This study aimed to assess the antimicrobial efficacy of 0, 0.5, 2, and 5 wt% nanosilver in conjunction with zinc oxide eugenol (ZOE) against Enterococcus faecalis. MATERIALS AND METHODS: Nanosilver in 0.5, 2, and 5 wt% concentrations was added to ZOE and the antibacterial activity of the mixtures on E. faecalis was assessed using disk diffusion method, and the results were reported as the diameter of the growth inhibition zone. RESULTS: The diameters of the growth inhibition zones around 0, 0...
March 1, 2017: Journal of Contemporary Dental Practice
https://www.readbyqxmd.com/read/28256467/antibacterial-nanosilver-coated-orthodontic-bands-with-potential-implications-in-dentistry
#3
Rahul Damodaran Prabha, Rajasigamani Kandasamy, U Sajeev Sivaraman, Maya A Nandkumar, Prabha D Nair
BACKGROUND & OBJECTIVES: Fixed orthodontic treatment, an indispensable procedure in orthodontics, necessitates insertion of dental bands. Insertion of band material could also introduce a site of plaque retention. It was hypothesized that band materials with slow-release antimicrobial properties could help in sustained infection control, prevention of dental plaque formation and further associated health risks. Considering the known antimicrobial proprieties of silver, a coating of silver nanoparticle (SNP) onto the stainless steel bands was done and characterized for its beneficial properties in the prevention of plaque accumulation...
October 2016: Indian Journal of Medical Research
https://www.readbyqxmd.com/read/28221765/design-of-macroscopically-ordered-liquid-crystalline-hydrogel-columns-knitted-with-nanosilver-for-topical-applications
#4
Reshma Lali Raveendran, Nishanth Kumar Sasidharan, Sudha J Devaki
The design of liquid crystalline hydrogels knitted with silver nanoparticles in macroscopic ordering is becoming a subject of research interest due to their promising multifunctional applications in biomedical and optoelectronic applications. The present work describes the development of liquid crystalline Schiff-based hydrogel decorated with silver nanoparticles and the demonstration of its antifungal applications. Schiff base was prepared from polyglucanaldehyde and chitosan, and the former was prepared by the oxidation of amylose (polyglucopyranose) isolated from abundantly available unutilized jackfruit seed starch...
March 1, 2017: Bioconjugate Chemistry
https://www.readbyqxmd.com/read/28179931/effect-of-imidazolium-based-silver-nanoparticles-on-root-dentin-roughness-in-comparison-with-three-common-root-canal-irrigants
#5
Melika Farshad, Abbas Abbaszadegan, Yasamin Ghahramani, Akram Jamshidzadeh
INTRODUCTION: The aim of this study was to evaluate the effect of a nanosilver-based irrigant on dentin roughness in comparison with three commonly used root canal irrigation solutions. METHODS AND MATERIALS: Three common irrigants including 5.25% sodium hypochlorite (NaOCl), 17% ethylenediaminetetraacetic acid (EDTA) and 2% chlorhexidine (CHX) and also an imidazolium-based silver nanoparticle solution (ImSNP) (5.7×10 (-8) mol/L), were used. Distilled water was used as control...
2017: Iranian Endodontic Journal
https://www.readbyqxmd.com/read/28149459/sealing-efficacy-of-mineral-trioxide-aggregate-with-and-without-nanosilver-for-root-end-filling-an-in-vitro-bacterial-leakage-study
#6
Mahsa Eskandarinezhad, Naiemeh Shahveghar-Asl, Reza Sharghi, Sajjad Shirazi, Sahar Shakouie, Amin-Salem Milani, Esrafil Balaei
BACKGROUND: Various materials have been added to mineral trioxide aggregate to enhance its properties. This study was aimed to compare the sealing efficacy of MTA with and without nanosilver using bacterial leakage approach. MATERIAL AND METHODS: Seventy canine teeth were prepared and obturated. Then, after apical resection, the root-end cavities were prepared by ultrasonic retrotips. Teeth were randomly divided into 4 groups containing two experimental groups (n=30) and two negative and positive controls (n=5)...
January 2017: Journal of Clinical and Experimental Dentistry
https://www.readbyqxmd.com/read/28110014/nanosilver-as-a-disinfectant-in-dental-unit-waterlines-assessment-of-the-physicochemical-transformations-of-the-agnps
#7
Alireza Gitipour, Souhail R Al-Abed, Stephen W Thiel, Kirk G Scheckel, Thabet Tolaymat
Dental unit water lines (DUWL) are susceptible to biofilm development and bacterial growth leading to water contamination, causing health and ecological effects. This study monitors the interactions between a commonly used nanosilver disinfectant (ASAP-AGX-32, an antimicrobial cleaner for dental units, 0.0032% Ag) and biofilm development in DUWL. To simulate the disinfection scenario, an in-house DUWL model was assembled and biofilm accumulation was allowed. Subsequent to biofilm development, the disinfection process was performed according to the manufacturer's instructions...
January 12, 2017: Chemosphere
https://www.readbyqxmd.com/read/28109747/silver-nanoparticles-induce-hormesis-in-a549-human-epithelial-cells
#8
Mireille M J P E Sthijns, Waluree Thongkam, Catrin Albrecht, Bryan Hellack, Aalt Bast, Guido R M M Haenen, Roel P F Schins
Despite the gaps in our knowledge on the toxicity of silver nanoparticles (AgNPs), the application of these materials is fast expanding, from medicine, to food as well as the use in consumer products. It has been reported that prolonged exposure might make cells more resistant to AgNPs. This prompted us to investigate if AgNPs may give rise to a hormetic response. Two types of AgNPs were used, i.e. colloidal AgNPs and an AgNP powder. For both types of nanosilver it was found that a low dose pretreatment of A549 human epithelial cells with AgNPs induced protection against a toxic dose of AgNPs and acrolein...
January 18, 2017: Toxicology in Vitro: An International Journal Published in Association with BIBRA
https://www.readbyqxmd.com/read/28061858/cytotoxic-effects-of-nanosilver-are-highly-dependent-on-the-chloride-concentration-and-the-presence-of-organic-compounds-in-the-cell-culture-media
#9
Jean-Pierre Kaiser, Matthias Roesslein, Liliane Diener, Adrian Wichser, Bernd Nowack, Peter Wick
BACKGROUND: Nanosilver shows great promise for use in industrial, consumer or medical products because of its antimicrobial properties. However, the underlying mechanisms of the effects of silver nanoparticles on human cells are still controversial. Therefore, in the present study the influence of the chloride concentration and different serum content of culture media on the cytotoxic effects of nanosilver was systematically evaluated. RESULTS: Our results show that nanosilver toxicity was strongly affected by the composition of the culture media...
January 6, 2017: Journal of Nanobiotechnology
https://www.readbyqxmd.com/read/28042861/comparison-of-hydrogels-based-on-commercial-chitosan-and-beetosan-%C3%A2-containing-nanosilver
#10
Bożena Tyliszczak, Anna Drabczyk, Sonia Kudłacik
Two series of hydrogels on the basis of commercial chitosan and chitosan derived from naturally expired honeybees are presented in this article. Sorption capacity and behavior of both kind of materials in simulated body fluids such as Ringer's liquid or artificial saliva have been determined and compared. Presence of functional groups in synthesized materials have been determined by means of FT-IR spectroscopy. Structure and homogeneity of their surface have been defined using Scanning Electron Microscopy. Based on the conducted research, it can be stated that both chitosan and Beetosan(®) hydrogels have very similar characteristics...
December 31, 2016: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/27993063/formation-of-nanosilver-from-silver-sulfide-nanoparticles-in-natural-waters-by-photoinduced-fe-ii-iii-redox-cycling
#11
Lingxiangyu Li, Qunfang Zhou, Fanglan Geng, Yawei Wang, Guibin Jiang
Nanosilver (nAg) has been repeatedly demonstrated to end up as silver sulfide nanoparticles (Ag2SNPs), but little is known about the potential transformations of Ag2SNPs in natural environments that are very important for comprehensive assessments of nAg risks to human and environmental health. Here we show that Ag2SNPs can release tiny amounts of silver ion via cation exchange reactions between Ag(I) and Fe(III) in the dark, while in the light dramatic dissolution of Ag2SNP occurs, which is mainly attributed to the Ag2SNP oxidation by the hydroxyl radical formed during the reduction of Fe(III) to Fe(II) in water under sunlit conditions...
December 20, 2016: Environmental Science & Technology
https://www.readbyqxmd.com/read/27859556/effect-of-nanosilver-on-cortisol-release-and-morphometrics-in-rainbow-trout-oncorhynchus-mykiss
#12
Laura Murray, Michael D Rennie, Eva C Enders, Kerri Pleskach, Jonathan D Martin
Nanosilver (nAg) is a nanoparticle commonly incorporated into consumer products for its antimicrobial properties that has been detected in aquatic environments. Toxic effects of nAg on fish have been observed and may induce a stress response in fish in the form of increased blood plasma cortisol. In this study, effects of nAg exposure on Rainbow Trout (Oncorhynchus mykiss) were investigated over a 28 d period using blood plasma cortisol concentrations as an indicator of stress. Several morphometric measures (growth, Fulton's condition factor, and hepatosomatic index or HSI) were also taken during the experiment to investigate potential whole-body effects of exposure, and concentrations of nAg in fish muscle tissue were measured...
November 17, 2016: Environmental Toxicology and Chemistry
https://www.readbyqxmd.com/read/27834732/oxidant-generation-dna-damage-and-cytotoxicity-by-a-panel-of-engineered-nanomaterials-in-three-different-human-epithelial-cell-lines
#13
Waluree Thongkam, Kirsten Gerloff, Damien van Berlo, Catrin Albrecht, Roel P F Schins
Due to the steeply increased use of nanomaterials (NMs) for commercial and industrial applications, toxicological assessment of their potential harmful effects is urgently needed. In this study, we compared the DNA-damaging properties and concurrent cytotoxicity of a panel of 10 engineered NMs in three different cell lines in relation to their intrinsic oxidant generating properties. The human epithelial cell lines A549, HK-2 and HepG2 were chosen to represent relevant target organs for NMs in the lung, kidney and liver...
January 2017: Mutagenesis
https://www.readbyqxmd.com/read/27825359/use-of-a-modified-greenscreen-tool-to-conduct-a-screening-level-comparative-hazard-assessment-of-conventional-silver-and-two-forms-of-nanosilver
#14
Jennifer Sass, Lauren Heine, Nina Hwang
BACKGROUND: Increased concern for potential health and environmental impacts of chemicals, including nanomaterials, in consumer products is driving demand for greater transparency regarding potential risks. Chemical hazard assessment is a powerful tool to inform product design, development and procurement and has been integrated into alternative assessment frameworks. The extent to which assessment methods originally designed for conventionally-sized materials can be used for nanomaterials, which have size-dependent physical and chemical properties, have not been well established...
November 8, 2016: Environmental Health: a Global Access Science Source
https://www.readbyqxmd.com/read/27800593/biocompatibility-of-nanosilver-coated-orthodontic-brackets-an-in-vivo-study
#15
Gamze Metin-Gürsoy, Lale Taner, Emre Barış
BACKGROUND: Nanosilver particles of which antibacterial and antifungal properties have been shown in various in vitro and in vivo studies are used in many medical and dental fields for the prevention of infection. In this study, it is intended to evaluate the biocompatibility of nanosilver-coated brackets. METHODS: Nanosilver coating process was applied to the standard orthodontic brackets by a physical vapor deposition system. Brackets were coated with nanosilver particles of 1 μ thickness...
December 2016: Progress in Orthodontics
https://www.readbyqxmd.com/read/27747311/antimicrobial-effects-of-silver-nanoparticles-stabilized-in-solution-by-sodium-alginate
#16
Anatoliy Kubyshkin, Denis Chegodar, Andrew Katsev, Armen Petrosyan, Yuri Krivorutchenko, Olga Postnikova
BACKGROUND/PURPOSE: To investigate the effect of nanosilver particles in solution stabilized in a matrix of sodium alginate on the growth and development of pathogenic bacteria such as Staphylococcus aureus, Enterococcus faecalis, Escherichia coli, Proteus vulgaris, Enterobacter cloacae, the antibiotic-resistant strain of Pseudomonas aeruginosa, the yeast-like fungus Candida albicans, and the luminescent bacteria Photobacterium leiognathi Sh1. METHODS: Isolates of pathogenic bacteria obtained from bronchoalveolar and peritoneal lavage samples from Wistar rats with experimental pneumonia and peritonitis were tested for their susceptibility to silver nanoparticles in solution with an alginate stabilizer...
2016: Biochemistry & Molecular Biology Journal
https://www.readbyqxmd.com/read/27721039/-gold-nanoparticles-composite-folic-acid-conjugated-graphene-oxide-nanohybrids-for-targeted-chemo-thermal-cancer-ablation-in-vitro-screening-and-in-vivo-studies
#17
Gaurav Chauhan, Vianni Chopra, Amit Tyagi, Goutam Rath, Rakesh K Sharma, Amit K Goyal
Nano-graphene oxide (GO) nanometal composite (specifically nanogold and nanosilver) have shown to be a promising material for anticancer therapeutics. Owing to their high drug loading capacity, photothermal and synergizing effects, it is very important to exploit them for targeted chemo-thermal cancer therapeutics. In this work, gold nanoparticles (AuNPs) were selected as the composite metal, folic acid (FA) was taken as GO surface functionalization moiety for active tumor targeting of model anticancer drug Doxorubicin (Dox)...
January 1, 2017: European Journal of Pharmaceutical Sciences
https://www.readbyqxmd.com/read/27704758/additively-manufactured-macroporous-titanium-with-silver-releasing-micro-nanoporous-surface-for-multipurpose-infection-control-and-bone-repair-%C3%A2-a-proof-of-concept
#18
Zhaojun Jia, Peng Xiu, Pan Xiong, Wenhao Zhou, Yan Cheng, Shicheng Wei, Yufeng Zheng, Tingfei Xi, Hong Cai, Zhongjun Liu, Cai-Mei Wang, Wei-Ping Zhang, Zhi-Jiang Li
Restoring large-scale bone defects, where osteogenesis is slow while infections lurk, with biomaterials represents a formidable challenge in orthopedic clinics. Here, we propose a scaffold-based multipurpose anti-infection and bone repairing strategy to meet such restorative needs. To do this, personalized multifunctional titanium meshes were produced through an advanced additive manufacturing process and dual "TiO2‒poly(dopamine)/Ag (nano)" post modifications, yielding macroporous constructs with micro/nanoporous walls and nanosilver bullets immobilized/embedded therein...
October 5, 2016: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/27699838/biomarkers-of-exposure-to-nanosilver-and-silver-accumulation-in-yellow-perch-perca-flavescens
#19
Jonathan D Martin, Tash-Lynn L Colson, Valerie S Langlois, Chris D Metcalfe
There is a risk of exposure of aquatic organisms to nanosilver (AgNP) from discharges of municipal and industrial wastewater. In the present study, yellow perch (Perca flavescens) were exposed in static-renewal experiments conducted over 96 h and 10 d to environmentally relevant concentrations (i.e. 1 and 100 µg/L) of AgNP and Ag(+) . The greatest accumulation of total silver (tAg) occurred in the liver of P. flavescens and there was >10-fold more accumulation in the treatments with Ag(+) relative to the AgNP treatments...
October 4, 2016: Environmental Toxicology and Chemistry
https://www.readbyqxmd.com/read/27693238/synthesis-and-characterization-of-nanosilver-silicone-hydrogel-composites-for-inhibition-of-bacteria-growth
#20
F M Helaly, S M El-Sawy, A I Hashem, A A Khattab, R M Mourad
PURPOSE: Nanosilver-silicone hydrogel (NAgSiH) composites for contact lenses were synthesized to asses the antimicrobial effects. METHODS: Silicone hydrogel (SiH) films were synthesized followed by impregnation in silver nitrate solutions (10, 20, 30, 40, 60, 80ppm) and in-situ chemical reduction of silver ions using sodium borohydride (NaBH4). The silver nano particles (AgNPS) were identified by UV-vis absorption spectroscopy, Energy-dispersive X-ray spectroscopy (EDX) mapping and EDX spectrum...
February 2017: Contact Lens & Anterior Eye: the Journal of the British Contact Lens Association
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