Search

The study was to evaluate the biological activity and agar extraction from nano synthesized red seaweed Gelidiella acerosa. The algae were Collected from the coastal areas of Rameswaram, TamilNadu. Seaweed was subjected to pre-treatment process with Alkaline pre-treatment. The aqueous extraction of Gelidiella acerosa were extracted by decoction method and Synthesis of AgNO3 was carried out. Silver nano synthesized aqueous extract was observed for the biological activities such as Anti-bacterial. Antibacterial activity of the nanosynthesised seaweed extract was checked for gram-positive and gram-negative bacteria. The Pseudomonas aeruginosa and Bacillus subtilis bacteria contains a good of zones of inhibition. Furthermore, characterization studies such as UV–spectrometry analysis, FT-IR analysis, Zeta potential and AFM.

Ochradenus arabicus is a significant therapeutic plant which grows in desert zones of Saudi Arabia. It has antimicrobial, anticancer, cancer prevention, antidiabetic, allopathic and pabulum properties. The present study evaluated the biosynthesis of silver nanoparticles (AgNPs) utilizing the leaf concentrate of plant O. arabicus having novel ethnomedicinal potential. The incorporated AgNPs were visualized utilizing UV-Visible spectroscopy, X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR) and transmission electron microscopy (TEM). The antimicrobial impact of AgNPs delivering O. arabicus was considered utilizing distinctive pathogenic microorganisms, for example, Escherichia coli, Staphylococcus aureus, Pseudomonas aeruginosa and Streptococcus mutans. From the plate dispersion results, the incorporated silver nanoparticles demonstrated potent antibacterial properties and high antimicrobial action contrasted with the ionic silver. Supplemental data for this article is available online at https://doi.org/10.1080/13102818.2021.1961609 .

Recently there have been many attempts for the biosynthesis of silver or gold nano particles from plant (root, leaves, stem etc.) extracts. In the present article, we have shown, for the first time, that low dilution China or Cina (Homeopathic medicines both of strength theta) can also dissociate AgNO3 producing Ag nanoparticles. We have stabilized these Ag nanoparticles in some bioactive polymers (like polyvinyl alcohol ,PVA) and studied their electrical and dielectric properties. Enhancement of conductivity and dielectric constants of these Ag stabilized polymer nanocomposite films compared to those of the corresponding pure polymer films indicated the presence of Ag nanoparticles in the films.

Aim and objective To compare the arresting caries effectiveness of two different silver nanoparticle (AgNP) concentrations of nano-silver fluoride (NSF), namely 400 and 600 ppm. The hypothesis is that in posterior primary teeth with occlusal and approximal active dentin carious lesions, NSF 600's effectiveness will be higher than that of the NSF 400 solution over a 6-month follow-up period. Materials and methods This was a double-blind randomized clinical trial (RCT) conducted in the city of Recife, Brazil. A total of 337 children aged 5-7 years who attended the University of Pernambuco Dental School's clinics were examined. A single-blinded investigator conducted the examinations and treatment of the children. After baseline examination and recording of the dmft index, children were allocated to one of two study groups (NSF 600-intervention and NSF 400-positive control). In both groups, each tooth received two drops of NSF and treatments were performed only once in 6 months. The follow-up examinations were visual and tactile, performed in 30, 90, and 180 days to determine the activity of caries. The carious lesions that were not arrested in 30 days were recorded and referred for restorative treatment. Results The NSF 600 showed higher rate of success in arresting caries (72.7%, p = 0.025) compared with NSF 400 (56.5%). Conclusion The higher rate of success of NSF 600 can be explained by the higher concentration of AgNPs. Clinical significance Nano-silver fluoride has emerged as an excellent alternative to silver diamine fluoride (SDF), as it adds a high antibacterial effect to better esthetic results. Treatment is simple, non-invasive, and incurs low cost. It is ideal for use in community-based programs to increase the access to dental care without staining teeth black like other silver products. How to cite this article Arnaud M, Junior PCM, Lima MGS, et al. Nano-silver Fluoride at Higher Concentration for Caries Arrest in Primary Molars: A Randomized Controlled Trial. Int J Clin Pediatr Dent 2021;14(2):207-211.

In this world, every revolution is entirely based on the intelligence of human being and improvement in comfortable life with scientific approach. The part of human body plays a vital role in emergent the wonder in nature. Recently, Titanium plays major role in all the leading industries and it has been extensively used in aerospace industry, defence, industrial process, automotive industry, agriculture machinery and medical applications The main objective of this experimental investigation is to overcome the limitation of Titanium used for medical applications by forming nano material coating with silver nano materials in chitosan on titanium surface by electro deposition method. Coating of different nano materials plays crucial role in the various applications required for finding the strength and microstructure of titanium sheet. The output responses are characterized by Fourier Transform Infrared Spectroscopy (FTIR), Cyclic Voltammetry, Scanning Electron Microscope (SEM) and Energy Dispersive X-ray Spectroscopy (EDX). It was reported that, advanced nano biomaterial structures recommended for medical implantation for further investigation.

Colloidal silver nano particles are prepared by biosynthesis using medicinal plants like Ocimum Sanctum and AdhaThodaVasica. Soft gamma ray irradiation is done on the samples. Transmission electron microscopic image of before irradiated silver nano colloid shows the agglomeration of spherical nano clusters while the irradiation results in the reduction of particle size with well defined grains. Selected area electron diffraction studies can explain both the polycrystalline pattern of silver nano colloids. Further, the crystal structure is identified as Face Centered Cubic pattern. The formation and stability of silver nano particles in the colloidal solutions are monitored using uv–visible absorption spectra. Gamma irradiation does not change the band gap value of nano silver. Here the plant extracts served not only as reducing agents but also a good stabilizing agent, which prevents the aggregation of silver nano particles. Gamma ray irradiation helps a better confined morphology for silver nano particle without affecting the structural parameters and optical band gap values.

Nowadays, treatment to the infected wounds caused by bacterial even multi-resistant bacterial strains and subsequently complete skin regeneration remain a critical clinical challenge. Herein, a novel multi-functional platform (Alg/1.0Ag@CMC-PAMAM/PRP) was prepared as wound dressings by mixing platelet rich plasma (PRP) with the sodium alginate (Alg) based dressing containing nano silver (Ag)-doped carboxymethyl chitosan grafted polyamideamine (Ag@CMC-PAMAM) cationic polymers. The present dressings exhibited high swelling, suitable water vapor transmission rate (WVTR), and good mechanical properties and degradability, as well as sustained release of PRP. Besides, the component of Ag@CMC-PAMAM nanoparticles endow them with excellent antibacterial performance, while the incorporation of PRP promotes the effect of anti-inflammatory and angiogenesis by up-regulating relative activity factor expression of TGF-β1, CD31 and α-SMA and down-regulating the inflammatory-relative genes including TNF-α, IL-6 and IL-1β, all of which promote the closure of wound and produce a superior healing effect to the commercial Aquacel Ag group. This work indicates that the prepared Alg/1.0Ag@CMC-PAMAM/PRP wound dressing is a promising biomaterial with synergistic effect of antibacterial property and wound healing.

Hydroxyapatite-Silver (HAp/AgNPS) coating on 2507 duplex stainless steel (DSS) by electrophoretic deposition (EPD) process was done to improve corrosion and antibacterial resistance of 2507 DSS. The uncoated and coated 2507 DSS substrates were submerged in the physiological solution (Ringer) at 37 °C in this research. The ideal EPD parameters for good 2507 DSS coating were 20 V and 3 min, with homogeneous layer free of cracks, and low porosity. The corrosion results showed that all 2507 DSS coated samples had a lesser corrosion current density than the 2507 DSS uncoated sample and thus better corrosion resistance, while antibacterial results indicate that AgNPS play an effective role in destroying and inhibiting bacteria.

The current work focusses on the silver nanoparticles (Ag-NPs) that are conveniently green synthesized by Mangifera indica gum powder extract. The absorbance is measured by UV–Vis spectrophotometer at a wavelength of 455 nm that represents the Surface Plasmon Resonance of Ag-NPs. Fourier Transform-Infra Red (FT-IR) spectroscopy confirms the functional groups and reaction mechanisms involved in the green synthesis of Ag-NPs. The elemental analysis of Ag-NPs is carried out by Energy dispersive X-ray (EDAX) spectrum and its surface morphology was studied by High resolution transmission electron microscopy (HR-TEM). The average size of Ag-NPs is found to be around 19 nm in diameter. The crystalline nature of the Ag-NPs is investigated by X-ray diffraction (XRD) and Selected area diffraction (SAED). The Ag-NPs shows better antioxidant activity against free radicals such as 2,2-diphenyl-1-picrylhydrazyl (DPPH) and superoxide anion. Ag-NPs effect on reduction mild steel corrosion is examined using non electrochemical methods. It is proved from experimental tests that the inhibition efficiency increases with increased concentrations of Ag-NPs. The photocatalytic activity of the prepared Ag-NPs under visible light irradiation is assessed by the degradation of methylene blue (MB) dye.

A study was conducted to find out the effect of nano silver particles (NSPs) on vase life of gerbera cut flower at Post harvest laboratory, College of Horticulture, Dr. YSRHU, Anantharajupeta. The treatment T11- Nano silver @ 10 ppm + sucrose @ 2% is found be significantly superior over other treatments and control. It recorded maximum cumulative water uptake (96.60 g), transpirational loss of water (95.06 g), water balance (1.54 g), fresh weight of flower (15.77 g), vase life (19.77 days) and the lowest bacterial count in vase solution (1.03 X 106 CFU ml-1) was observed at the end of the vase life in 10 ppm nano silver whereas the flowers held in distilled water (control) recorded minimum water uptake (21.93 g), transpirational loss of water (28.23 g), water balance (-6.30 g), fresh weight of flower (10.80 g), vase life (19.77 days) and highest bacterial count (9.18 X 106 CFU ml-1).

Preparation of nano sized silver particles was performed by using flower extract of Aerva javanica (AJ). Conversion of Ag+ ions to nanoscaled Ago was carried out in 90 min reaction by green approach. Antiviral potential of nanosilver (NS) was evaluated against Avian Influenza Virus (AIV) strain H9N2, in 9-11 days old chicken embryonated eggs. Synthesized particles were also screened against four methicillin-resistant Staphylococcus aureus (MRSA) strains by well diffusion method. Formation of spherical particles was confirmed by SPR band at 428 nm. XRD analysis confirmed face centred cubic crystal structure of particles with average particle size of 15 nm as calculated by Debye–Scherrer’s formula. Remarkable anti AIV activity was observed from NS particles with IC50 value 50 ?g/ml and this value is 200 times greater control drug i.e., Amantadine. Synthesized particles were also screened against four methicillin-resistant Staphylococcus aureus (MRSA) strains by well diffusion method. Significantly high antiviral and antibacterial activities were observed from nanosilver particles against AIV H9N2 and all four MRSA strains.Keywords

Botrytis cinerea is a necrotrophic pathogen that significantly reduced the postharvest quality and longevity of cut roses. The aim of this study was to examine the effects of nano silver, sodium hypochlorite (NaOCl), and salicylic acid on B. cinerea infection in cut rose flowers. Cut ‘Revival’ roses were treated with nano silver, NaOCl, salicylic acid, and distilled water, and simultaneously held in the solutions. Subsequently, the cut flowers were sprayed with B. cinerea solution and held under export conditions for 4 days. The results showed that nano silver was the most effective treatment in suppressing B. cinerea growth in cut roses during vase life. Nano silver effectively extended the vase life of cut roses by 2.3 days, compared with non-treated flowers. The addition of nano silver also enhanced water uptake and sustained the water balance and fresh weight of the cut rose flowers. Our results indicated that nano silver is an effective treatment solution to inhibit B. cinerea infection and improve postharvest quality and longevity of cut rose flowers for export.

Colloidal Silver in European Union is food additive. The aim of the study is to show the common effects of colloidal nano silver and electromagnetic fields. The influence on colloidal nano silver with concentration of 30 ppm was studied using the method of Drossinakis in electromagnetic waves in the range of ν=20 -70 Hz. The research was performed with the methods for spectral analyses Nonequilibrium energy spectrum (NES) and Differential nonequilibrium energy spectrum (DNES). The study was performed with research of parameters of pH and oxidation reduction potential (ORP). The control sample is the sample with colloidal nano silver. The sample was taken after the influence with electromagnetic fields on the sample with colloidal nano silver. The effect of electromagnetic fields is connected with increasing of the effects of colloidal nano silver. There are proofs with differences between samples and control sample with parameters of NES, DNES, pH, ORP.

In this study, we demonstrate the in-situ synthesis of a functional hybrid material of calcium alginate (CaAlg)/nano-silver phosphate (nano-Ag3PO4). The morphology of nano Ag3PO4 was in spherical shape with a diameter of 10–60 nm, and uniformly distributed in the continuous phase of CaAlg. The limiting oxygen index (LOI) of the hybrid material reached 61.4%, which was about 53.0% higher than that of CaAlg. In addition, its heat release rate, total heat release and smoke emission were much lower than those of CaAlg. The thermogravimetric analysis coupled with Fourier transform infrared analysis and pyrolysis-gas chromatography–mass spectrometry results indicate that the synthesized material released less flammable gas, compared to CaAlg, and the thermal mechanism of CaAlg/Ag3PO4 was proposed based on the data. Furthermore, the antibacterial rate of the hybrid material against common pathogens was >97%. This study prefigures the promising application of the marine polysaccharide functional materials in the field of the fire protection and epidemic prevention.

Somatic embryo is a developmental method for mass multiplication of valuable medicinal plants. In this study, leaf explants of Ngoc Linh ginseng were disinfected with nano silver at different concentrations and exposure times to eliminate infectious agents and induce embryogenic callus for the production of somatic embryos. The results show that the lowest contamination rate (20.00%) was observed when leaf explants were treated with 0.5 g/L nano silver for 15 minutes while the highest embryogenic callus induction rate (72.22%) and fresh weight (0.77 g) was determined at 0.2 g/L nano silver for 20 minutes. High frequency of somatic embryogenesis formation and germination were occurred on MS medium supplemented 1.0 mg/L 2,4-D; 0.5 mg/L NAA; 0.2 mg/L Kin and 1.6 mg/L nanosilver. After 8 weeks of culture, the number somatic embryos derived from nano silver treated-leaves was increased 2 times than non-treated explants. Addition of 1.0 mg/L NAA and 1.2 mg/L nano silver was showed the highest shoot and root length, root number, fresh and dry weight of plantlets. This research showed that pre-treatment and supplement of nano silver in culture medium is potentially useful for improving embryogenesis frequency, and plantlet formation of Ngoc Linh ginseng cultured in vitro.

Na2O-BaO-Borate glasses were synthesized with silver nano-particles of varying silver concentrations by the method of melt-quenching. Their densities of the glasses and hence molar volumes were computed. The existence of the silver nano-particles was depicted by characteristic band in the absorption spectra of UV- Visible studies known as plasmon band. Further the matrix also showed a small amount of nanostructures of the host which imparts the nonlinear behaviour. They were further visualized by the Scanning and Transmission electron microscopy. Optical band gap and Urbach energies were found. The band gap values change exactly in the opposite manner of density with silver doping. The wide luminescence band in the visible region formed for the excitation of plasmon band may be utilized for the luminescence enhancement of luminescent material like rare earth ions. The very significant result perceived from this is that the glass as such with silver nano-particles showed broad emission in the, green & blue portions of electromagnetic spectrum in the close vicinity of white light with the variation of silver content which can be utilized for the enrichment of the emission of lanthanide ions in the visible section of electro-magnetic spectrum.

Objective: In this study, bleached jute yarn was treated with methyl methacrylate and then in situ synthesis of silver nanoparticles were performed. Experimental: Experimental data showed a decrease in tensile strength of treated yarns from 0.91 to 0.78 g/dtex. Afterwards, treated samples were dyed with 1:1 and 1:2 pre-metallised dyes. Results: Methyl methacrylate treated jute yarns exhibited higher color strength (12.55%) and fastness properties as compared to untreated samples. Conclusion: Methyl methacrylate treated and nano-coated jute yarns showed much better color strength (23.96%) and higher color fastness properties towards light and washing.

Recently, the discharge of effluent containing dyes and other chemicals into river, lakes, and land has become a serious problem which increases the pollution level drastically. The dyes in the effluent are very difficult to be removed by conventional water treatment methods. Thus, there is a great need for more advanced methods that are cost-effective and more efficient. In this study, silver nano particles (AgNps) were synthesized by green method using extracts of onion (O), tomato (T), acacia catechu (C) alone, and mixed COT extracts. The reduction and formation of AgNps and its ions have been characterized by using several techniques, Ultra visible spectroscopy (UV–vis), X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM)-energy dispersive X-ray spectrometer (EDX), Fourier transmission infrared spectroscopy (FTIR), and dynamic light scattering (DLS). These techniques revealed that the particle sizes of synthesized AgNps in all the extracts were ranged in between 5 and 100 nm with a crystalline nature. The synthesized AgNps were used as catalysts for the degradation of three different types of dyes, methyl orange (MO), methyl red (MR), and congo red (CR) in the liquid state. The excellent catalytic application of all the synthesized AgNps on the degradation of the studied dyes was confirmed via UV–visible results by studying the reduction in the absorbance maxima value within a very short interval of time. COT synthesized products were found to achieve the best performance for all dyes degradation among all products.

NaBaPO4:Eu2+,Er3+ phosphors and Ag nano-particles (NPs) were prepared by the solid-state reaction and chemical reduction method, respectively. The fluorescence spectra and decay curves demonstrate the effective energy transfer from Eu2+ to Er3+ and the existence of three-photon quantum-cutting through two-step cross-relaxation of Er3+. The quantum-cutting emission is peaked at 1534 nm with a broad excitation band centered at 352 nm. Plasmon-enhanced quantum-cutting of NaBaPO4:Eu2+,Er3+ phosphors was realized by decorating Ag NPs. The largest enhancement factor is 1.395. It is hopeful to improve the photovoltaic conversion efficiency of Ge solar cells by using this phosphor.

Two levels Plackett-Burman experimental design was employed to screen the main factors that significantly affect the synthesis of bioactive silver nanoparticles. Scenedesmus obliquus ethanol extract, Scenedesmus obliquus dried algal powder and Spirulina platensis aqueous extract were the most favorable reducing and capping agents. Also the high pH value (10), rpm (150), high concentration of AgNO3 (4 mM) and dark conditions had the highest significant influence on biosynthesis of active nanoparticles. Characterizations of the formed AgNPs were approved by UV–Visible Spectroscopy, Transmission Electron Microscopy and Fourier Transform Infrared spectroscopy. The nanoparticles were varied in sizes and shape that ranged between 2.83 and 27.17nm, depending on the organism used and the method of biosynthesis. Valuable inhibitory effects were showed by all bio-synthesized nanoparticles against four tested Gram- positive and Gram- negative bacteria, except that formed by Spirulina platensis powder. Moreover, the nanoparticles exhibited wide range of antifungal activities. AgNPs prepared from ethanol extract of Spirulina platensis was the most active against HepG2 and MCF-7 cell lines, with IC50values 62.1 and 56.2 ug/mL, respectively. The obtained results, indicated the advantages of AgNPs from microalgae and possible industrial applications as a source of antifungal, antibacterial, and antitumor formulation.

Many studies in literature showed the effectiveness of silver diamine fluoride (SDF) and Nano silver fluoride (NSF) as preventive agents. However, there is little evidence regarding the retention properties of fissure sealant (FS) when applied on a surface previously treated with these preventive agents. Objective: To evaluate and compare the effect of fissure pre-treatment with SDF versus NSF on the microleakage of FS in permanent teeth. Methods: This experimental in vitro study was performed on 45 extracted human premolars, teeth were randomly assigned into three groups according to the type of fissure treatment: Group I: Control group (sealant only), Group II: SDF group (pre-treatment before sealant), and Group III: NSF group (pre-treatment before sealant). Teeth were thermos-cycled and then immersed in 2% methylene blue solution for 24 hours, teeth were then sectioned mesio-distally in the middle of the fissure, and examined under the stereomicroscope for dye penetration. Results: There was no statistical significant difference in the microleakage scores between the three groups (p=0.247). Conclusion: Pretreatment of the pits and fissure with SDF or NSF prior to sealant application did not affect the micro-leakage of the FS.

Nasosinusitis (NA) is a severe inflammatory disease. In recent years, NA’s morbidity and its threat to patients is becoming increasingly serious. Clinically, it is considered that NA recurrence and refractoriness is due to eosinophil (EO) proliferation. Nanotechnology improvement and application is a breakthrough in diagnosing and treating clinical diseases. Among which, nano-silver (NNS) technology is consistent with effective NA treatment, but there is no reliable research demonstrating this. In this study, inflammatory factors, EO chemokines, and epidermal growth factors (EGF) in NNS-treated NA mice were analyzed to determine whether NNS had a potential therapeutic effect on NA. The results showed the clinical NA symptom score in mice decreased (P κB and eotaxin in the maxillary sinus mucosa were inhibited (P P

Humans are exposed to nuclear radiations every day, and these radiations are both natural and artificial. When the body tissues are exposed to nuclear radiation, free radicals are formed, which are responsible for cancer development. In this research, silver nanoparticles were synthesized by electrical explosion wire method. Nanoparticles were added to deionized water that contained free radicals before and after exposure to gamma rays. The obtained results indicate that the silver nanoparticles have antioxidant potential through possessing free radical scavenging activity, as they can donate electron to free radicals and become neutralize. Then, these nanoparticles were injected to mice before and after their irradiation with gamma ray. The liver and kidney of the mice were shown to be unaffected by gamma irradiation.

Green synthesis of silver nano-particles (AgNPs) from silver nitrate was carried out using purple-colored rice leaves' extracts containing higher phenols, anthocyanins, and flavonoids. The efficacy of synthesized AgNPs was tested against rice diseases and investigation was carried out to check negative effect of AgNPs on soil microbes. Substantial reduction of total anthocyanins, total phenols, and total flavonoids was observed in reaction mixture during AgNP formation indicating the role of secondary metabolites on AgNP formation and stabilization. Scanning electron microscopy coupled with energy-dispersive spectroscopic images and FTIR spectral analysis of AgNPs confirmed the presence of elemental silver encapped by biomolecules. The optimized reaction parameters for synthesis of AgNPs from silver nitrate were (a) 48 h of incubation, (b) 9:1 (v/v) 1 mM AgNO3:plant extract, and (c) room temperature at 20-30 °C. Zeta potential and hydrodynamic particle sizes of synthesized AgNPs were ranged between - 16.61 to - 29.45 mV and 36-107 nm, respectively, at different time of incubation. AgNPs could control effectively Rhizoctonia solani and Xanthomonas oryzae pv. Oryzae and Helminthosporium oryzae. AgNPs at higher concentration could cause negative effect on microbial biomass carbon and soil enzymes for distant future. But the negative effects of AgNP solution (10% of 1 mM AgNPs) were comparable to commercial fungicide, carbendazim. The synthesized AgNPs with desirable characters were effective against a number of disease-causing pathogens in rice, and it can be recommended as broad-spectrum pesticide.

Soldering using common lead-free solder alloys is still one of the main die attach technology, in particular for applications in power electronics where high temperatures have to be met. However, some newly developed attach technologies promise to offer more interesting features in terms of both mechanical and thermal properties. Among these new methods, sintering of nano-silver particles allows to obtain a high thermal conductivity needed in the assemblies of electronic or optical components, as well as a relatively low elastic modulus for better stress accommodation and enhanced thermo-mechanical reliability. The sintering processing parameters, mainly the bonding pressure, the sintering temperature profile, and the sintering atmosphere, are known to have a critical effect on the properties of the sintered layer, such as its mechanical strength and electrical/thermal performances.In this study, copper substrates are fabricated and assembled by sintering using a nano-silver paste. The objective is to obtain a bonding joint with high mechanical flexbility, capable of addressing the thermomechanical stresses for systems operating under high temperatures. The measured mechanical properties of the sintered material show on the one hand low elastic modulus of the joint which is appropriate for strong difference in thermal expansion between components, and on the other hand sufficient mechanical strength for the assembly. Microstructure analyses reveal a highly porous silver network structure of the joint, with submicrometric silver grains and large micrometric porosities homogeneously distributed.

B2O3–ZnO–Na2O–Li2O (BZNL) based glasses containing silver nano particles (Ag NPs) were prepared by melt-quenching technique. Four reducing agents such as Bi2O3, As2O3, Sb2O3, SnO were separately used to reduce Ag+ ions into Ago atoms in the form of nano particles. The glasses were characterized by XRD, FTIR, DSC, Optical absorption and Raman spectroscopy. The amorphous nature of the prepared glasses was confirmed through XRD and SEM measurements. The EDS spectra showed that all the added elements were present in the respective glasses. The vibrational features of various functional groups like stretching vibrations of B–O linkages in BO4 tetrahedral, asymmetric stretching vibrations of B–O bond in BO3 trigonal units and vibrations of Zn–O bonds from ZnO4 groups were identified by FTIR and Raman spectroscopy. From optical absorption studies it was observed that all prepared samples except SnO did not show characteristic surface plasmon resonance (SPR) band of Ag. Therefore, all the samples were heat treated at 500oC in accordance with DSC thermogram to form Ag nano particles. The formation of Ag nanoparticles was confirmed by optical absorption spectra. The doping of SnO to BZNL-Ag glass system could assist the growth of silver nano particles was showed by a sharp peak in optical absorption spectra at 410 nm as SPR band.

Introduction: Nanotechnology is a field of research and innovation concerned with building 'things' - generally, materials and devices on the scale of atoms and molecules. It is a booming field of this 21st century. The role of nano technology is becoming very crucial in nearly every aspect of life ranging from cosmetics to advanced bio technological approaches. In recent years, silver nanoparticles have gained considerable attention in the field of medicine. The green synthesis of nanoparticles eliminates the generation and use of hazardous substances and thus sustains non toxicity. Chlorogenic acids are phenolic compounds formed by the esterification of cinnamic acids. They exhibit various pharmacological Properties. Our study deals with the green synthesis of Chlorogenic acid mediated silver nanoparticles and assessment of their anti inflammatory and antioxidant properties. Aim: The present study aims at assessing the antioxidant and anti inflammatory property of chlorogenic acid mediated silver nanoparticle and investigating the efficacy of Chlorogenic acid mediated Silver nanoparticle. Materials and Methods: The methodology includes Green synthesis of Chlorogenic acid mediated Silver nano particle synthesis followed by tests for Anti inflammation and Anti oxidation. Results: Both the Anti inflammatory and Anti oxidation activity of the chlorogenic acid mediated silver nanoparticle had shown a proportionate increase in activity with increasing concentration of the compound. Conclusion: Chlorogenic acid mediated silver nanoparticles have shown significant anti inflammatory and anti oxidation activity and they are considered as potent anti inflammatory and antioxidant agents.

In this investigation, silver nano-particles (AgNPs) were coated on the surface of the Eichhornia crassipes fiber (ECF) by single-step hydrothermal method. The coating of AgNPs on the external laye...

Silver is an antimicrobial agent well known since antiquity. With the emergence of multiresistant bacteria, it has come back into the focus of research, and ionic as well as nano-sized silver have been studied in vitro and in vivo. The results are controversial, silver being discussed as the "silver bullet" or a "wolf in sheep's clothing". A thorough search of literature from chemistry, materials and environmental science, biology and medicine led to this Review which summarizes the potential use of silver and its compounds in medicine, ongoing processes of dissolution and the different methods by which this usefulness can be evaluated. It also highlights the therapeutic window of silver, mechanistic interactions of silver and biological media as well as best practices for handling silver in a biomedical environment. This Review reflects the current knowhow and observations, and may thus give hints and guidelines to understand and interpret the observed effects.

Today, it is aimed to produce high quality products and reduce energy consumption in metal cutting processes. For this purpose, it is necessary to use cutting fluids with high tribological performance in metal cutting processes. With the use of these fluids, the lubrication and cooling functions required in metal removal processes will be provided effectively. In addition, minimal and effective use of fluids will reduce processing costs and energy consumption. In this study, tribological performances of cutting fluids consisted of nano-silver and boric acid were investigated comprehensively in the milling process of AA7075-T6 material. First, colloidal suspensions were prepared in ethylene glycol medium using nano-silver as a cooling and surface film-forming agent and boric acid as a lubricating agent. Secondly, milling experiments were performed according to semi factorial design method. Surface roughness (Ra) and cutting forces were considered as performance criteria. Visual and elemental analyses of chips were performed via scanning electron microscopy (SEM) and energy-dispersive X-ray (EDX) spectroscopy. Tool wear and build-up-edge (BUE) formation was examined by optical microscope. According to the results, the cutting fluid prepared with nano-silver (nAg) and boric acid (BA) in a medium of ethylene glycol (EG) decreased surface roughness by 14.59% more than the nAg and EG mixture and by 5.27% more than the BA and EG mixture. In addition, cutting forces of EG + BA + nAg was observed 0.846% and 0.115% lower than the EG + nAg and EG + BA, respectively. In terms of tool wear and chip morphology, EG + BA + nAg cutting fluid showed better results than other cutting fluids.

Silver nano particles (AgNPs) were green synthesized using Adansonia digitata leaf extract. The synthesized silver nano particles were characterized in terms of synthesis, size, shape, morphology and capping functionalities by UV-Visible Spectroscopy, Scanning Electron Microscopy (SEM) and Fourier Transform Infrared Spectroscopy (FTIR). Antimicrobial activity of the synthesized silver nano particles was investigated by well diffusion method. The antibacterial activity of the nano particle was studied against Staphylococcus aureus, Escherichia coli, Bacillus subtilis, Pseudomonas aeurigunosa, Salmonella typhi and Klebsiella pneumonae while the antifungal activity was studied against Candida albicans, Aspergillus niger, Penicillum notatum and Rhizopus stolomifer. The synthesized AgNPs was active against all the studied microorganisms. Staphylococcus aureus was the most susceptible bacterium (inhibition zones ranging from 12.00 to 28.00 mm, MIC: 30 µl, MBC: 50 µl) while Aspergillus niger was the most susceptible fungi (inhibition zones ranging from 10.00 to 18.00 mm, MIC: 90 µl, MFC: 120 µl. In conclusion the synthesized silver nanoparticles was found to have antimicrobial activity against the pathogenic bacteria and fungi tested and hence has a great potential in biomedical application for the treatment of microbial infections.

Current trends in the science and medicine is the advent of nano technology. This technology had been in application in the traditional systems of medicine like Ayurveda and Siddha. They adopt this techonology by preparing the nano particles of heavy metals like mercury, gold, silver etc. and use those formulations effectively in curing diseases. Out of the metals that are available to use in medicine, Silver stands as a important and safest yet potent metal that is made as nano particles. It is evident from history that silver is being used as nano particle. It prevents infections and kills microbes and helps store food like milk, wine and vinegar for longer periods. Apart from the electronic and technological application of the nano particles, the pharmaceutical and medical application of the same had been under development. This research will focus on the comparision of the ficus plants like; Ficus religiosa, Ficus benghalensis, Ficus microcarpa, Ficus hispida, Ficus trigona and Ficus citrifolia extracts on the synthesis of the silver nano particles and their antibacterial property.

Objective This study investigated the effect of silver diammine fluoride (SDF), nano-silver (AgNPs) and nano-silver/potassium fluoride (AgNPs/KF) on the morphology of dentin collagen and color staining on the dentin. Also, we investigated the anti-caries properties in terms of anti-bacterial effects and potentiality of dentin remineralization at collagen level. Methods Dentin specimens obtained from bovine tooth roots were finished with #2000 SiC and sonicated for 5 min. Specimens were divided into two main groups: sound and demineralized dentin. Each group was subdivided into five subgroups according to treatment solution: control (no treatment), SDF, nano-silver (AgNPs), AgNPs/KF and KF. Specimens were analyzed using transmission electron microscope (TEM), spectrophotometer, scanning electron microscope (SEM) and antibacterial test. Repeated Measures ANOVA was used for statistical analysis of color change while one-way ANOVA was used for CFU analysis. Results Regarding color change, SDF showed the highest values while the other groups exhibited insignificant changes. SDF showed alteration in the collagen fibrils while the other groups showed normal intact fibrils. Regarding antibacterial activity, SDF and AgNPs/KF showed the greatest antibacterial effect. Significance SDF altered the dentin collagen morphology and inferior ethetics, but still providing intrafibrillar remineralization. Nano-silver fluoride preparations (AgNPs/KF) can be an alternative material for SDF as it can preserve the dentin collagen, showing no color change overtime, and provide a high anti-caries property including intrafibrillar remineralization with a significant anti-bacterial effect.

Nano silver/polyvinyl alcohol hydrogel nanocomposites have been prepared using gamma irradiation technique. Gamma irradiation serves as a crosslinking agent for the polyvinyl alcohol hydrogels and also acts as a reducing agent for reduction of Ag+ ions to zero valent Ag0 within the polyvinyl alcohol crosslinked network. The microstructural characteristics of the prepared composites were studied using powder X-ray diffraction, ultraviolet–visible spectroscopy, Fourier-transform infrared spectroscopy and field emission scanning electron microscopy analysis. The data obtained by these characterizations indicate the homogeneous distribution of silver nanoparticles on the polyvinyl alcohol network. The swelling properties and mechanical parameters of the silver/polyvinyl alcohol hydrogel nanocomposites tend to show improvements, making them a better material for wound care applications. The silver/polyvinyl alcohol hydrogel nanocomposites have shown good antibacterial potential against both Gram-positive and Gram-negative bacteria and shown nil or minimal cytotoxic effect on human melanoma (SK-MEL-2) and mouse melanoma (B16-F1) cell lines. Overall, it was concluded that under optimized condition, silver/polyvinyl alcohol hydrogel nanocomposites synthesized using gamma irradiation technique are excellent candidates for wound dressing application.

Pomegranate (Punica granatum L.) is one of the most favorite fruits which consumed fresh or processed into juice due to its nutritional quality. Fresh cut pomegranate arils have become popular for their ease of eating, highest value, unique properties and health benefits. This study was conducted during the two successive seasons 2017 and 2018. Data revealed all packaging materials in combination with gelatin recorded high score of visual quality along the storage period, after 18 days at 5 ± 1 °C compared with the control. Coating arils in alginate at 3% with Packing in silver nano bag was the effective MPA bags in maintaining taste, aroma and overall acceptability. Also, it recorded the higher value of anthocyanin, vitamin C and antioxidant activity whereas decreased pectinase activity. On the other hand, coating arils in alginate at 3% with packing in Xtend bag (XT) was prefer ablein maintained brightness score and produced lower loss in weight % and oxygen levels inside the package. It could be concluded that coating arils of Wonderful pomegranate in alginate solution 3% then stored in silver nano bag (SN) technology was more effective method to extend storage life of fresh cut pomegranate aril during cold storage.

The nanotechnology had been gaining importance in all the fields like technology, medicine even in robotics. The scientists are focusing on that type of synthesis wherein the advantages overcomes the disadvantages of the production and the plants have been probed as better alternatives in this field. The emerging technology of using plants as precursors or aiding in the production of nanotechnology is viewed as , low toxicity and better in approaching the preparation of . That is why of silver had been in usage considering its antibacterial potency to kill any kind of bacteria. Silver particles had been the best choices for physicians to treat wounds. Hibiscus Rosa plant leaves are found to have abundant so they can be used to reduce the silver ions into . The formed were less toxic as they were synthesized in a natural process. These when tested for antibacterial activity against three species of bacteria, the results were as expected. The produced silver particles showed a significant ZOI compared to the standard drug.

Nanoparticles have their demand in various fields of science and technology and their applications extend even in medical and pharmaceutical arena. They have been used as preservatives, diagnosing aids and potent antibacterial agents. But their production is a serious matter of concern when it comes to cost, efficacy and toxicity issues. Overcoming these limitations green synthesis has taken its advantage for their commercial and large scale synthesis. This research will focus on the preparation of nano particles of silver with the help of purified leaf extract from Lannea coromandelica and evaluation of the same using UV-Vis Spectrophotometry. The nanoparticles exhibited surface plasmon resonance at 420nm in UV spectroscopy. Futhermore, nanoparticles have been evaluated for their antibacterial activity on Putida vulgaris, Staphylococcus aureus, and Bacillus subtillis. The results proved the eco friendly synthesized silver nanoparticles have a good antibacterial and can be used effectively in therapies targeting infections and infectious wounds.

Nanoparticles have been in raising demand in many fields of science and biotechnology and extends its applications in biomedical and pharmaceutical areas. Out of all the metals silver leads the way in this technology in view of its practical applications. They are used to preserve, diagnose many diseases and mainly used in external applications on the body emphasizing their antimicrobial and healing abilities. On the other hand, the synthesis of nano particles has been a very serious concern due to its huge cost of production, toxicity and dosing issues. Bio synthesis or green synthesis using herbals and microbes to synthesize nano particles showed a path to overcome the above hurdles and make the synthesis of silver nanoparticles more commercial and can be adopted on large scale. In this research silver nano particles were synthesized using purified extracts of leaves of Lannea coromandelica and were confirmed using UV spectroscopy. The produced nanoparticles exhibited surface plasmon resonance at 420nm in UV spectroscopy. They were investigated for their wound healing activity in excision wound model in wistar albino rats for a 16 day study. These nano particles were found to be very successful and showed wound healing property. Thus produced nano particles showed similar activity competent enough with that of the standard, Betanidine. These silver nano particles can be used efficiently in therapies that target infections and wounds that are provoked and delayed healing due to infections.

Polyurethane is a medical material, which has excellent physical properties and high mechanical compatibility. At present, one of the most effective application methods for antibacterial bacterial biofilm is to combine polyurethane with nano-silver, so that the polyurethane material itself has bactericidal performance and finally plays a good antibacterial effect. From August 2011 to January 2014, 75 patients with crush injury or avulsion injury who had difficulty healing were randomly divided into 5 groups. Results: Comparison of colony count results of different concentrations of nano-silver polyurethane; comparison of colony count results of two groups in vitro; comparison of anticoagulant degree and determination of whole blood coagulation time; comparison of coagulation routine examination results of two groups; comparison of epithelial growth factor levels at different time after treatment; comparison of tumor necrosis factor- a levels at different time after treatment between two groups; comparison of change times, visual analogue score of pain during treatment and hospitalization time of two groups; comparison of white blood cell count of two groups of polyurethane patients within 1 week; comparison of clinical efficacy between two groups. Conclusion: The medical material containing nano-silver polyurethane is a good bacteriostatic biomaterial, which can inhibit common iatrogenic pathogens in vitro. The application of 5% nano-silver polyurethane medical material to open wound, especially in patients with avulsion and crush injury in orthopaedics, can inhibit the growth of common hospital pathogenic bacteria. can significantly reduce the level of tumor necrosis factor- a in the wound, reduce the local inflammatory response, and can significantly improve the clinical effect of the treatment of complex wounds, which is worthy of clinical promotion.

Herein, we declare on the biosynthesis of synthesised silver nanoparticles utilizing the aqueous extract of Origanum Marjoranaby reducing 1 mM silver nitrate at room temperature. AgNPs were characterized by using some common techniques such as an ultra violet spectrophotometer, Fourier transforms infrared spectroscopy, X-ray diffraction, and transmission electron microscopy. Morphologically, AgNPs demonstrated a spherical shape with an average particle size distribution of 63– 85 nm. FT-IR studies showed the presence of bioactive useful bunches such as phenolic compounds, amines, and aromatic rings are found to be the capping, stabilizing specialists and required for the reduction of silver ions of AgNPs. The measurement of toxicity of AgNPs and the plant extract of O. marjoranaagainst Earias insulanawas also discussed. After the treatment of synthesized nanoparticles for two successive seasons, general reduction percentages on the infestation of the green boll caused by E. insulana larvae in the second season was more by 60.4% than the first season which was 44.73%. Synthesized AgNPs treatment was considered more effective than plant extract for controlling E. insulana. General reduction percentages in the infestation of the green boll caused by E. insulana larvae in the first season associated with the treatments with AgNPs and plant extract were 44.73 and 37.53% while the second season record 60.4 and 51.82%; respectively.