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Silver AND Nanoparticles

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https://read.qxmd.com/read/30776484/biosynthesis-of-silver-nanoparticle-using-extract-of-zea-mays-corn-flour-and-investigation-of-its-cytotoxicity-effect-and-radical-scavenging-potential
#1
T Rajkumar, Andras Sapi, Gitishree Das, Trishna Debnath, AbuZar Ansari, Jayanta Kumar Patra
Silver nanoparticles (AgNPs) possesses a number of exceptional pharmaceutical properties and applications as compared with other types of metallic nanoparticles. Currently, AgNPs was biosynthesized using an aqueous extract of Zea mays L. (corn flour) powder. Further, the effect of concentration of reagents, extract, temperature and time of synthesis was also studied along with the cytotoxicity and radical scavenging potential. UV-vis spectra of AgNPs gave a surface plasmon resonance at ~420 nm. The absorption peak became sharp with the increase in time...
January 17, 2019: Journal of Photochemistry and Photobiology. B, Biology
https://read.qxmd.com/read/30776442/cellulose-nanofibril-silver-nanoparticle-composite-as-an-active-food-packaging-system-and-its-toxicity-to-human-colon-cells
#2
Zhilong Yu, Wei Wang, Fanbin Kong, Mengshi Lin, Azlin Mustapha
Cellulose nanofibrils (CNFs) and silver nanoparticles (AgNPs) are nano-sized fillers widely used for enhancing the active functions of food packaging materials. However, nanomaterials may pose unexpected toxic effects on humans. Thus, the objective of this work was to develop a novel CNF/AgNP composite and investigate its properties and cytotoxicity. The CNF/AgNP composite was prepared via a reduction method using NaBH4 . The AgNPs embedded in the composite showed an average size of 10.72 ± 4.96 nm and a surface plasmon resonance (SPR) absorption peak at 397 nm...
February 15, 2019: International Journal of Biological Macromolecules
https://read.qxmd.com/read/30776221/conserved-microbial-toxicity-responses-for-acute-and-chronic-silver-nanoparticle-treatments-in-wetland-mesocosms
#3
Christopher S Ward, Jin-Fen Pan, Benjamin P Colman, Zhao Wang, Carley A Gwin, Tiffany C Williams, Abby Ardis, Claudia K Gunsch, Dana E Hunt
Most studies of bacterial exposure to environmental contaminants focuse on acute treatments; yet, the impacts of single, high-dose exposures on microbial communities may not readily be extended to the more likely scenario of chronic, low-dose contaminant exposures. Here, in a year-long, wetland mesocosm experiment, we compared microbial community responses to pulse (single 450 mg dose of silver) and chronic (weekly 8.7 mg doses of silver for one year) silver nanoparticle (Ag0NP) treatments, as well as a chronic treatment of "aged" sulfidized silver nanoparticles (Ag2S NPs)...
February 18, 2019: Environmental Science & Technology
https://read.qxmd.com/read/30775181/synthesis-of-silver-nanoparticles-using-a-modified-tollens-method-in-conjunction-with-phytochemicals-and-assessment-of-their-antimicrobial-activity
#4
Muna A AbuDalo, Ismaeel R Al-Mheidat, Alham W Al-Shurafat, Colleen Grinham, Vinka Oyanedel-Craver
Background: Silver nanoparticles (AgNPs) have attracted great attention due to their outstanding electrical, optical, magnetic, catalytic, and antimicrobial properties. However, there is a need for alternative production methods that use less toxic precursors and reduce their undesirable by-products. Phyto-extracts from the leaves of olive and rosemary plants can be used as reducing agents and (in conjunction with Tollens' reagent) can even enhance AgNP antimicrobial activity. Methods: Conditions for the proposed hybrid synthesis method were optimized for olive leaf extracts (OLEs) and rosemary leaf extracts (RLEs)...
2019: PeerJ
https://read.qxmd.com/read/30773089/adaptive-tolerance-to-multigenerational-silver-nanoparticle-nm300k-exposure-by-the-nematode-caenorhabditis-elegans-is-associated-with-increased-sensitivity-to-agno-3
#5
Lisa M Rossbach, Erica Maremonti, Dag M Eide, Deborah H Oughton, Dag A Brede
Toxic effects of silver nanoparticles (Ag NPs) are, in most cases, measured within a single generation, while information regarding multigenerational exposure remains scarce. The current study assessed changes in toxic response (reproduction, fertility, and development) towards Ag NPs (NM300K; uncoated, 16.7 ± 6.5 nm) compared to AgNO3 over six generations, following chronic exposure of the model organism Caenorhabditis elegans. This revealed that AgNO3 exposure was associated with no changes in susceptibility to Ag...
February 18, 2019: Nanotoxicology
https://read.qxmd.com/read/30771972/silver-nanoparticles-assessment-in-moisturizing-creams-by-ultrasound-assisted-extraction-followed-by-sp-icp-ms
#6
Iria Rujido-Santos, Lucía Naveiro-Seijo, Paloma Herbello-Hermelo, María Del Carmen Barciela-Alonso, Pilar Bermejo-Barrera, Antonio Moreda-Piñeiro
Advances on nanometrology require reliable sample pre-treatment methods for extracting/isolating nanomaterials from complex samples. The current development deals with a discontinuous ultrasonication (60% amplitude, 15 cycles of ultrasound treatment for 59 s plus relaxing stage for 59 s, 20 mL of methanol) method for a fast and quantitative extraction of silver nanoparticles (Ag NPs) from moisturizing creams. Possibilities offered by modern inductively coupled plasma mass spectrometry (ICP-MS) which allow 'single particle' assessment (sp-ICP-MS) have been used for Ag NPs assessment (Ag NPs concentration and Ag size distribution)...
May 15, 2019: Talanta
https://read.qxmd.com/read/30771922/peak-bordering-for-ultrafast-single-particle-analysis-using-icp-ms
#7
Antonín Kaňa, Martin Loula, Richard Koplík, Magda Vosmanská, Oto Mestek
The characterisation of inorganic nanoparticles (NPs) by single particle inductively coupled plasma mass spectroscopy is possible only if the spectrometer is capable of measurement with high time-signal resolution. The latest generation of spectrometers allow for measurements with dwell times (dt) shorter than the 100 μs gold standard, i.e. as low as 10 μs. The statistical behaviours of signals obtained with dt values of 10, 20, 50, and 100 μs were tested for 40, 60, and 100 nm silver NPs. Very low measured signals (units of counts) led to the occurrence of zero signal values inside the peaks corresponding to individual NPs...
May 15, 2019: Talanta
https://read.qxmd.com/read/30771917/ultrasensitive-analysis-of-kanamycin-residue-in-milk-by-sers-based-aptasensor
#8
Yingfen Jiang, Da-Wen Sun, Hongbin Pu, Qingyi Wei
An ultrasensitive method for the kanamycin (KANA) detection in milk sample using surface-enhanced Raman spectroscopy-based aptasensor was employed in the current study. Double strand DNA binding bimetallic gold@silver nanoparticles were developed as a sensing platform. Probe DNAs were first embedded on the surface of gold nanoparticles by the end-modified thiol, and after silver shell encapsulating, KANA aptamer DNAs with the Raman reporter Cy3 were then hybridized with probe DNAs by complementary base pairing...
May 15, 2019: Talanta
https://read.qxmd.com/read/30771638/distinguishing-characteristics-and-usability-of-graphene-oxide-based-on-different-sources-of-graphite-feedstock
#9
Ebrahim Mahmoudi, Wei Lun Ang, Ching Yin Ng, Law Yong Ng, Abdul Wahab Mohammad, Abdelbaki Benamor
Graphene oxide (GO) has gained popularity in scientific research and industry due to its superior properties, which can be controlled by the synthesis method and graphite feedstock. Despite the availability of different graphite sources, most of the reported studies used natural graphite flake (NGF) as a source of oxidation for GO synthesis. The effect of various alternative graphite feedstocks on the GO properties has not been investigated systematically. This study investigated the influence of graphite feedstock (natural and synthetic) on the characteristics and properties of GO via modified Hummer's method...
February 7, 2019: Journal of Colloid and Interface Science
https://read.qxmd.com/read/30771632/ultrafast-microfluidic-synthesis-of-hierarchical-triangular-silver-core-silica-shell-nanoplatelet-toward-enhanced-cellular-internalization
#10
Nanjing Hao, Yuan Nie, Zhe Xu, John X J Zhang
Microfluidic reactors represent a new frontier in the rational design and controllable synthesis of functional micro-/nanomaterials. Herein, we develop a continuous and ultrafast flow synthesis method to obtain triangular silver (tAg) nanoplatelet using a short range two-loop spiral-shaped laminar flow microfluidic reactor, with one inlet flow containing AgNO3 , trisodium citrate, and H2 O2 and the other NaBH4 . The effect of the reactant concentration and flow rate on the structural changes of tAg is examined...
February 7, 2019: Journal of Colloid and Interface Science
https://read.qxmd.com/read/30771097/sers-based-chip-for-discrimination-of-formaldehyde-and-acetaldehyde-in-aqueous-solution-using-silver-reduction
#11
Huazhen Duan, Wei Deng, Zhenfei Gan, Dan Li, Dawei Li
A method is described for surface-enhanced Raman scattering (SERS) discrimination of formaldehyde (FA) and acetaldehyde (AA) in aqueous sample solutions. It is based on the use of a paper strip containing 4-aminothiophenol (Atp)-modified reduced graphene oxide (rGO)/[Ag(NH3 )2 ]+ (rGO/[Ag(NH3 )2 ]+ /Atp). The addition of FA or AA induces the conversion of [Ag(NH3 )2 ]+ complex to silver nanoparticles (AgNPs) because of aldehyde-induced silver reduction reaction. The AgNPs possess strong SERS activity. The average interparticle gaps between the AgNPs can be fine-tuned by controlling the experimental conditions, this leading to the formation of optimized SERS hot spots...
February 15, 2019: Mikrochimica Acta
https://read.qxmd.com/read/30771014/determination-of-the-activity-of-uracil-dna-glycosylase-by-using-two-tailed-reverse-transcription-pcr-and-gold-nanoparticle-mediated-silver-nanocluster-fluorescence-a-new-method-for-gene-therapy-related-enzyme-detection
#12
Kai Zhang, Wanting Huang, Yue Huang, Ke Wang, Xue Zhu, Minhao Xie
The authors present a fluorometric method for ultrasensitive determination of the activity of uracil-DNA glycosylase (UDG). It is based on the use of two-tailed reverse transcription-quantitative polymerase chain reaction (RT-qPCR) and an entropy-driven reaction. The assay involves the following steps: (1) UDG-driven uracil excision repair, (2) two-tailed RT-qPCR-mediated amplification, (3) RNA polymerase-aided amplification, and (4) DNA-modified silver nanoclusters (AgNCs) as a transducer to produce a fluorescent signal...
February 15, 2019: Mikrochimica Acta
https://read.qxmd.com/read/30769865/proteomic-analysis-of-the-effect-of-inorganic-and-organic-chemicals-on-silver-nanoparticles-in-wheat
#13
Hafiz Muhammad Jhanzab, Abdul Razzaq, Yamin Bibi, Farhat Yasmeen, Hisateru Yamaguchi, Keisuke Hitachi, Kunihiro Tsuchida, Setsuko Komatsu
Production and utilization of nanoparticles (NPs) are increasing due to their positive and stimulating effects on biological systems. Silver (Ag) NPs improve seed germination, photosynthetic efficiency, plant growth, and antimicrobial activities. In this study, the effects of chemo-blended Ag NPs on wheat were investigated using the gel-free/label-free proteomic technique. Morphological analysis revealed that chemo-blended Ag NPs resulted in the increase of shoot length, shoot fresh weight, root length, and root fresh weight...
February 14, 2019: International Journal of Molecular Sciences
https://read.qxmd.com/read/30769830/complementarity-of-matrix-and-nanostructure-assisted-laser-desorption-ionization-approaches
#14
REVIEW
Pawel Pomastowski, Boguslaw Buszewski
In recent years, matrix-assisted laser desorption/ionization (MALDI) has become the main tool for the study of biological macromolecules, such as protein nano-machines, especially in the determination of their molecular masses, structure, and post-translational modifications. A key role in the classical process of desorption and ionization of the sample is played by a matrix, usually a low-molecular weight weak organic acid. Unfortunately, the interpretation of mass spectra in the mass range of below m/z 500 is difficult, and hence the analysis of low molecular weight compounds in a matrix-assisted system is an analytical challenge...
February 14, 2019: Nanomaterials
https://read.qxmd.com/read/30769790/evolution-mechanism-of-photonically-sintered-nano-silver-conductive-patterns
#15
Fanbo Meng, Jin Huang
Flash sintering is the most promising sintering method because of its high speed and large area of effect. However, current flash sintering processes exhibit poor stability and the conductive pattern surface is highly susceptible to damage during this process. Therefore, a sintering parameter prediction system must be established to optimize sintering parameters for manufacturing. In this study, a photon-sintered nano-silver particle model is proposed for studying the sintering characteristics of metal nanoparticles...
February 14, 2019: Nanomaterials
https://read.qxmd.com/read/30769763/non-toxic-and-ultra-small-biosilver-nanoclusters-trigger-apoptotic-cell-death-in-fluconazole-resistant-candida-albicans-via-ras-signaling
#16
Braj Raj Singh, Vijai Kumar Gupta, Farah Deeba, Rajesh Bajpai, Vivek Pandey, Alim H Naqvi, Dalip Kumar Upreti, Nicholas Gathergood, Yueming Jiang, Hesham A El Enshasy, Essam Nageh Sholkamy, Ashraf A Mostafa, Abd El-Latif Hesham, Brahma N Singh
Silver-based nanostructures are suitable for many biomedical applications, but to be useful therapeutic agents, the high toxicity of these nanomaterials must be eliminated. Here, we biosynthesize nontoxic and ultra-small silver nanoclusters (rsAg@NCs) using metabolites of usnioid lichen (a symbiotic association of algae and fungi) that exhibit excellent antimicrobial activity against fluconazole (FCZ)-resistant Candida albicans that is many times higher than chemically synthesized silver nanoparticles (AgNPs) and FCZ...
January 29, 2019: Biomolecules
https://read.qxmd.com/read/30769154/ir-raman-and-sers-analysis-of-amikacin-combined-with-dft-based-calculations
#17
Cristina Balan, Lucian-Cristian Pop, Monica Baia
Amikacin, a molecule formed by two glucosamine rings linked by α-linkages through a central deoxystreptamine, is an antibiotic often used in clinical treatments, with a special attention in the pediatric cases, due to the physiological activity of their renal system. In spite of its extensive use, no detailed information about the vibrational features of the molecule is available in the literature. Thus, in this study we performed a comprehensive vibrational investigation of amikacin from both an experimental and theoretical point of view...
February 6, 2019: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://read.qxmd.com/read/30769027/comparative-study-between-two-red-algae-for-biosynthesis-silver-nanoparticles-capping-by-sds-insights-of-characterization-and-antibacterial-activity
#18
Ragaa A Hamouda, Mahmoud Abd El-Mongy, Kamel F Eid
Biosynthesis silver nanoparticles (AgNPs) have received a lot of attention as a Cytotoxic and antimicrobial activity against pathogenic bacteria. This study was carried out to evaluate the potential ability of red marine algae Corallina elongata and Gelidium amansii to biosynthesis AgNPs capping with Sodium Dodecyl Sulfate (SDS) and to determine its antibacterial efficacy. Characterization of capping AgNPs were determined by Ultra violet-Visible spectroscopy, Transmission electron microscope (TEM), Scanning electron microscopy (SEM), Fourier transforms infrared spectroscopy (FTIR), Energy dispersive X-ray spectroscopy (EDX), Zeta potential and sizer...
February 12, 2019: Microbial Pathogenesis
https://read.qxmd.com/read/30769019/in-vitro-anthelmintic-effect-of-biologically-synthesized-silver-nanoparticles-on-liver-amphistome-gigantocotyle-explanatum
#19
Abdur Rehman, Rizwan Ullah, Imran Uddin, Iram Zia, Lubna Rehman, S M A Abidi
In order to ensure global food security a rationale approach is required to control all those factors which directly or indirectly affect the food productivity. The neglected helminthic diseases alone are responsible for huge economic losses to the agrarian stakeholders. The problem is further compounded by the emerging drug resistance in flukes against the commonly used anthelmintics like triclabendazole. Therefore, the search for alternatives including the nano-based approaches has become a necessity to develop future control strategies...
February 12, 2019: Experimental Parasitology
https://read.qxmd.com/read/30765004/fabrication-of-silver-doped-bi-sb-%C3%A2-te%C3%A2-thermoelectric-film-prepared-from-ag-nanoparticles-bi-sb-te-pastes
#20
Young Min Cho, Gu Hyun Gwon, Soo Hyung Kim, Dong Won Kim, Jungho Choe, Kyung Tae Kim
Film-type thermoelectric generator (TEG) utilizing Bi-Te based paste has been highly considered as advanced power sources for the wearable electronic devices due to its light, thin and flexible characteristics when producing electricity from certain thermal resources such as human body heat. However, the application of the film-typed TEG has been often limited due to its low TE conversion efficiency caused by low electrical conductivity resulting from severe porosity. Thus, it is crucial to increase electrical properties via densification of the TE film...
July 1, 2019: Journal of Nanoscience and Nanotechnology
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