21,481 results match your criteria silver nanoparticles


Effect of Silver Nanoparticles and L-Carnitine Supplement on Mixed Vaginitis Caused by Candida albicans/ Staphylococcus aureus in Mouse Models: An Experimental Study.

Curr Microbiol 2021 Sep 20. Epub 2021 Sep 20.

Department of Biology, Faculty of Sciences, Razi University, Kermanshah, Iran.

The evolution of antimicrobial-resistant pathogens is a global health and development threat. Nanomedicine is rapidly becoming the main driving force behind ongoing changes in antimicrobial studies. Among nanoparticles, silver (AgNPs) have attracted attention due to their versatile properties. Read More

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September 2021

Supramolecular Chirality from Hierarchical Self-Assembly of Atomically Precise Silver Nanoclusters Induced by Secondary Metal Coordination.

ACS Nano 2021 Sep 20. Epub 2021 Sep 20.

Key Laboratory of Colloid and Interface Chemistry, Ministry of Education, School of Chemistry and Chemical Engineering, Shandong University, Ji'nan 250100, People's Republic of China.

Chiral assembly of metal nanoparticles (NPs) into complex superstructures has been widely studied, but their formation mechanisms still remain mysterious due to the lack of precise structural information from the metal-organic interface to metallic kernel. As "molecular models" of metal NPs, atomically precise metal nanoclusters (NCs) used in the assembly of a macroscale superstructure will provide details of microscopic structure for deep understanding of such highly sophisticated assemblies; however, chiral superstructures have not been realized starting from achiral metal NCs with atomic precision. Herein, we report the supramolecular assembly of a water-soluble silver NC ((NH)[Ag(mba)], Hmba = 2-mercaptobenzoic acid, abbreviated as Ag-NCs hereafter) into chiral hydrogels induced by the coordination of secondary metal ions. Read More

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September 2021

New solutions for combatting implant bacterial infection based on silver nano-dispersed and gallium incorporated phosphate bioactive glass sputtered films: A preliminary study.

Bioact Mater 2022 Feb 17;8:325-340. Epub 2021 Jun 17.

Advanced Materials Research Group, Faculty of Engineering, University of Nottingham, Nottingham, NG7 2RD, UK.

Ag/Ga were incorporated into resorbable orthopaedic phosphate bioactive glasses (PBG, containing P, Ca, Mg, Na, and Fe) thin films to demonstrate their potential to limit growth of and in post-operative prosthetic implantation. Dual target consecutive co-sputtering was uniquely employed to produce a 46 nm Ag:PBG composite observed by high resolution TEM to consist of uniformly dispersed ~5 nm metallic Ag nano-particles in a glass matrix. Ga was integrated into a phosphate glass preform target which was magnetron sputtered to film thicknesses of ~400 or 1400 nm. Read More

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February 2022

Insights into the interaction of microplastic with silver nanoparticles in natural surface water.

Sci Total Environ 2021 Sep 14;805:150315. Epub 2021 Sep 14.

School of Chemistry and Material Sciences, Ludong University, Yantai 264025, China. Electronic address:

The combined pollution induced by microplastics (MPs) and other pollutants, such as nanomaterials, has received increasing attention. The interaction between MPs and silver nanoparticles (AgNPs) may affect both their behaviors in natural environments, however, knowledge on these effects remains limited. In this study, AgNPs and three common MPs, polypropylene (PP), polyethylene (PE), and polystyrene (PS), were co-exposed to natural freshwater and brackish water to investigate the interaction between MPs and AgNPs in natural surface water. Read More

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September 2021

Optimization of hyphenated asymmetric flow field-flow fractionation for the analysis of silver nanoparticles in aqueous solutions.

Anal Bioanal Chem 2021 Sep 19. Epub 2021 Sep 19.

Chemical Oceanography, Marine Biogeochemistry, GEOMAR Helmholtz Centre for Ocean Research Kiel, Kiel, Germany.

The extensive use of silver nanoparticles (AgNPs) in consumer products, medicine, and industry leads to their release into the environment. Thus, a characterization of the concentration, size, fate, and toxicity of AgNPs under environmental conditions is required. In this study, we present the characterization and optimization of an asymmetric flow field-flow fractionation (AF4) system coupled with UV/Vis spectrophotometer and dynamic light scattering (DLS) detector as a powerful tool for the size separation and multi-parameter characterization of AgNPs in complex matrices. Read More

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September 2021

Trapping analytes into dynamic hot spots using Tyramine-medicated crosslinking chemistry for designing versatile sensor.

J Colloid Interface Sci 2021 Sep 8;607(Pt 1):782-790. Epub 2021 Sep 8.

Department of Chemistry, Institute for Molecular Science and Fusion Technology, Kangwon National University Chuncheon 24341, Republic of Korea; Kangwon Radiation Convergence Research Support Center, Kangwon National University, Chuncheon 24341, Republic of Korea. Electronic address:

Hypothesis: Due to the intrinsic nature of the surface-enhanced Raman scattering (SERS), the detection of molecules with weak binding affinities toward metal substrates is critical for development of a universal SERS sensing platform. We hypothesized the physical trapping of small pesticide molecules for active hot spot generation using tyramine-mediated crosslinking chemistry and silver nanoparticles (Ag NPs) enhances SERS detection sensitivity.

Experiments: Tyramine-mediated crosslinking chemistry for sensor application was validated by ultraviolet-visible absorption spectroscopy, scanning electron microscopy, dynamic light scattering, and Raman spectroscopy. Read More

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September 2021

Bioavailability and toxicity of silver nanoparticles: Determination based on toxicokinetic-toxicodynamic processes.

Water Res 2021 Aug 27;204:117603. Epub 2021 Aug 27.

Shenzhen International Graduate School, Tsinghua University, Shenzhen 518055, PR China.

Determining the bioavailability and toxicity mechanism of silver nanoparticles (AgNPs) is challenging as Ag is continuously released by external or internal AgNP dissolution in the actual exposure system (regardless of the laboratory or the natural environment). Here a novel pulsed-gradient Ag (AgNO) exposure was conducted with zebrafish (Danio rerio) larvae to simulate dissolved gradient concentrations of Ag from polyvinylpyrrolidone (PVP)-coated AgNPs. The accumulation and toxicity of the pulsed-gradient Ag (AgNO) and, in the meantime, the released Ag from PVP-AgNPs were predicted using a toxicokinetic-toxicodynamic (TK-TD) model with obtained Ag parameters. Read More

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Preparation of sodium hyaluronate/dopamine/AgNPs hydrogel based on the natural eutetic solvent as an antibaterial wound dressing.

Int J Biol Macromol 2021 Sep 15;191:60-70. Epub 2021 Sep 15.

College of Chemistry & Pharmacy and Life Science, Northwest A&F University, Yangling, Shaanxi 712100, PR China. Electronic address:

Baesd on previous researches, the natural deep eutectic solvent (DES) has enormous potential to be used in the fabrication of hydrogel wound dressing due to its outstanding properties including cytocompatibility, degradability and solubility. In order to further improve the antibaterial capacity of hydrogel, in the present study sodium hyaluronate (SH) and the natural DES were utilized to develop a novel hydrogel wound dressing by dopamine (DA) coated SH with in situ reduction of silver nanoparticles ([email protected]). Furthermore, during the preparation process, we discovered for the first time that the DES can be used to fill the freeze-dried DASH to prepare a hydrogel (DES-DASH), which was promising to utilized in the fabrication of other hydrogels. Read More

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September 2021

pH-Responsive Smart Wettability Surface with Dual Bactericidal and Releasing Properties.

ACS Appl Mater Interfaces 2021 Sep 17. Epub 2021 Sep 17.

School of Food and Biological Engineering, Jiangsu University, Zhenjiang 212013, Jiangsu, P. R. China.

Biomaterial-associated infections caused by pathogenic bacteria have important implications on human health. This study presents the design and preparation of a smart surface with pH-responsive wettability. The smart surface exhibited synergistic antibacterial function, with high liquid repellency against bacterial adhesion and highly effective bactericidal activity. Read More

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September 2021

Effect of silver nanoparticles on the antibacterial activity of Levofloxacin against methicillin-resistant Staphylococcus aureus.

Authors:
M J Saadh

Eur Rev Med Pharmacol Sci 2021 Sep;25(17):5507-5510

Faculty of Pharmacy, Middle East University, Amman, Jordan.

Objective: The paper presents the antibacterial activity of silver nanoparticles (AgNPs) when conjugated with Levofloxacin. The AgNPs used in this study were synthesized from silver nitrate using sodium borohydride as a reducing agent.

Materials And Methods: Levofloxacin activity was determined by minimum inhibitory concentrations (MICs) and also the erythrocyte hemolytic assay determined the capability of conjugation to cause hemolysis in human erythrocyte. Read More

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September 2021

Preparation, characterization, and antibacterial properties of hybrid nanofibrous scaffolds for cutaneous tissue engineering.

Hum Cell 2021 Sep 17. Epub 2021 Sep 17.

Stem Cell Research Center, Tabriz University of Medical Sciences, Tabriz, Iran.

Since polymeric nanofibrous scaffolds have been widely used in tissue regeneration, the risk of bacterial infections should not be neglected. In the present work, poly-caprolactone-silk fibroin-soluble eggshell membrane-silver nanoparticles (PCL-SF-SESM-AgNPs) and caprolactone-silk fibroin-soluble eggshell membrane-chitosan (PCL-SF-SESM-CS) scaffolds were fabricated via the electrospinning method for cutaneous regeneration. The composition, morphology, hydrophilicity, and mechanical features of prepared scaffolds were evaluated using Fourier transform infrared (FT-IR), scanning electron microscope (SEM), tensile, and water contact angle tests. Read More

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September 2021

Comparative Analysis of Machine Learning Algorithms on Surface Enhanced Raman Spectra of Clinical Species.

Front Microbiol 2021 31;12:696921. Epub 2021 Aug 31.

Department of Bioinformatics, School of Medical Informatics and Engineering, Xuzhou Medical University, Xuzhou, China.

Raman spectroscopy (RS) is a widely used analytical technique based on the detection of molecular vibrations in a defined system, which generates Raman spectra that contain unique and highly resolved fingerprints of the system. However, the low intensity of normal Raman scattering effect greatly hinders its application. Recently, the newly emerged surface enhanced Raman spectroscopy (SERS) technique overcomes the problem by mixing metal nanoparticles such as gold and silver with samples, which greatly enhances signal intensity of Raman effects by orders of magnitudes when compared with regular RS. Read More

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Genotoxicity of physical silver nanoparticles, produced by the HVAD method, for Chinchilla lanigera genome.

Sci Rep 2021 Sep 16;11(1):18473. Epub 2021 Sep 16.

Department of Animals Reproduction, Anatomy and Genomics, University of Agriculture in Krakow, Mickiewicza Av. 24/28, 30-059, Kraków, Poland.

Each year, growing demand for silver nanoparticles (AgNP) contributes to the search for alternative methods of their production. Stable AgNP with antibacterial properties, low toxicity to the environment and living organisms are especially valued. In the study presented here, an attempt was made to assess the toxicity of two AgNP solutions produced using the HVAD method to the Chinchilla lanigera genome. Read More

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September 2021

Controlled metallization of ion-exchanged glasses by thermal poling.

J Phys Condens Matter 2021 Sep 16. Epub 2021 Sep 16.

Laboratory of Multifunctional Glassy Materials, Peter the Great St Petersburg Polytechnic University, Polytechnicheskaja 29, St. Petersburg, 195251 Russia, Sankt-Peterburg, Sankt-Peterburg, 195251, RUSSIAN FEDERATION.

We present studies of the formation of silver nanoparticles (NPs) in silver-sodium ion-exchanged glasses by a combination of thermal poling and nanosecond pulsed laser irradiation at 355 nm. In poling, silver ions drift deeper into the glass and become separated from the glass surface by a poled layer depleted in cations. Performed measurements have indicated poling-induced broadening of silver ions depth distribution. Read More

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September 2021

Determination of the yield, mass and structure of silver patches on colloidal silica using multiwavelength analytical ultracentrifugation.

J Colloid Interface Sci 2021 Aug 27;607(Pt 1):698-710. Epub 2021 Aug 27.

Institute of Particle Technology, Friedrich-Alexander University Erlangen-Nürnberg, Cauerstrasse 4, Erlangen 91058, Germany.

Anisotropic nanoparticles offer considerable promise for applications but also present significant challenges in terms of their characterization. Recent developments in the electroless deposition of silver patches directly onto colloidal silica particles have opened up a simple and scalable synthesis method for patchy particles with tunable optical properties. Due to the reliance on patch nucleation and growth, however, the resulting coatings are distributed in coverage and thickness and some core particles remain uncoated. Read More

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Silver nanoparticles boost charge-extraction efficiency in microbial fuel cells.

Science 2021 09 16;373(6561):1336-1340. Epub 2021 Sep 16.

Department of Materials Science and Engineering, University of California, Los Angeles, Los Angeles, CA 90095, USA.

[Figure: see text]. Read More

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September 2021

Dual Functions of a [email protected] Nanocomposite Desalination Membrane with an Enhanced Antifouling Property and Fouling Detection Via Surface-Enhanced Raman Spectroscopy.

ACS Appl Mater Interfaces 2021 Sep 16. Epub 2021 Sep 16.

CSIRO Manufacturing, Private Bag 10, Clayton South, Melbourne 3169, Victoria, Australia.

Membrane fouling has remained a major challenge limiting the wide application of membrane technology because it reduces the efficiency and shortens the lifespan of the membrane, thus increasing the operation cost. Herein we report a novel dual-function nanocomposite membrane incorporating silver-coated gold nanoparticles ([email protected]) into a sulfosuccinic acid (SSA) cross-linked poly(vinyl alcohol) (PVA) membrane for a pervaporation desalination. Compared with the control PVA membrane and PVA/SSA membrane, the [email protected]/PVA/SSA membrane demonstrated a higher water flux and better salt rejection as well as an enhanced antifouling property. Read More

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September 2021

Utilization of Localized Surface Plasmon Resonance of Silver Nanoparticles for the Spectrofluorimetric Estimation of Oxymetazoline in Dosage Forms: Application to Aqueous Humor.

J Fluoresc 2021 Sep 15. Epub 2021 Sep 15.

Department of Pharmaceutical Analytical Chemistry, Faculty of Pharmacy, Mansoura University, Mansoura, 35516, Egypt.

A simple, novel, cost-effective and highly sensitive spectrofluorimetric method was developed for estimation of the nasal decongestant oxymetazoline (OMZ) whether per se or in its pharmaceutical preparations using colloidal silver nanoparticles (AgNPs). The method is based on the high catalytic potential activity of AgNPs on the fluorescence intensity of OMZ leading to 12-fold increase in its fluorescence intensity. The response was linear over the range of 20. Read More

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September 2021

Photocatalytic redox on the surface of colloidal silver nanoparticles revealed by second harmonic generation and two-photon luminescence.

Phys Chem Chem Phys 2021 Sep 15;23(35):19752-19759. Epub 2021 Sep 15.

Shenzhen Key Laboratory of Flexible Printed Electronics Technology, also School of Science, Harbin Institute of Technology (Shenzhen), University Town, Shenzhen 518055, Guangdong, China.

The redox of silver on the surface of Ag nanoparticles (AgNPs) has received extensive attention because of its significant impact on the biological, physical and chemical properties of AgNPs and their applications. Here we demonstrate that the surface redox reaction of AgNPs in colloids may be investigated by the second harmonic generation (SHG) and two-photon luminescence (TPL) emission from the AgNPs. It was revealed that the oxidation of silver on the surface of AgNPs was accelerated upon femtosecond laser excitation, accompanied by a decrease in the SHG and TPL emissions from the AgNPs. Read More

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September 2021

Importance of exposure route in determining nanosilver impacts on a stream detrital processing chain.

Environ Pollut 2021 Sep 3;290:118088. Epub 2021 Sep 3.

Department of Experimental Limnology, Leibniz Institute of Freshwater Ecology and Inland Fisheries (IGB), Zur alten Fischerhütte 2, 16775, Stechlin, Germany; Department of Ecology, Berlin Institute of Ecology (TU Berlin), Ernst-Reuter-Platz 1, 10587, Berlin, Germany.

The commercial use and spread of silver nanoparticles (AgNPs) in freshwaters have greatly increased over the last decade. Both AgNPs and ionic silver (Ag) released from nanoparticles are toxic to organisms and compromise ecosystem processes such as leaf litter decomposition. Yet little is known about how AgNPs affect multitrophic systems of interacting species. Read More

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September 2021

Fabrication of a honeycomb-like bimetallic SERS substrate for the detection of triphenyltin chloride.

Analyst 2021 Sep 15. Epub 2021 Sep 15.

Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing 400714, P. R. China.

Triphenyltin chloride (TPhT) is an organotin compound that causes intensive toxicological risk to the environment and humans. A detection method with high sensitivity and stability is therefore desired to better detect TPhT. In this study, a novel SERS substrate was prepared by sputtering an ultra-thin Au layer on a honeycomb-like silver nanoarray fabricated the nanosphere lithography method. Read More

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September 2021

Plant response to silver nanoparticles: a critical review.

Crit Rev Biotechnol 2021 Sep 14:1-18. Epub 2021 Sep 14.

Wolaita Sodo University, Wolaita, Ethiopia.

Although several metal ions/metal nanoparticles (NPs) are toxic to both plants and animals, some of them are used as nutrients and growth promoters. Plants exposed to silver nanoparticles (Ag-NPs) have shown both beneficial and harmful effects. All concentrations of Ag-NPs are not effective for a given plant because any excess can block the passage of essential nutrients. Read More

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September 2021

Biosynthesis of silver nanoparticles by Nocardiopsis sp.-MW279108 and its antimicrobial activity.

J Basic Microbiol 2021 Sep 14. Epub 2021 Sep 14.

Department of Biology, College of Science, Taif University, Taif, Saudi Arabia.

The utilization of microorganisms like bacteria in the biological synthesis of silver nanoparticles (AgNPs) has attracted widespread attention due to their ability to synthesize different shape sizes, states, and morphology nanoparticles. In the current study, the green synthesis of AgNPs by Nocardiopsis sp. 16S ribosomal RNA analysis was used to characterize the Nocardiopsis sp. Read More

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September 2021

Resistance and Resilience of Fish Gut Microbiota to Silver Nanoparticles.

mSystems 2021 Sep 14:e0063021. Epub 2021 Sep 14.

Environmental Microbiomics Research Center, School of Environmental Science and Engineering, Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Sun Yat-sen Universitygrid.12981.33, Guangzhou, China.

Understanding mechanisms governing the resistance and resilience of microbial communities is essential for predicting their ecological responses to environmental disturbances. Although we have a good understanding of such issues for soil and lake ecosystems, how ecological resistance and resilience regulate the microbiota in the fish gut ecosystem remains unclear. Using the zebrafish model, we clarified the potential mechanisms governing the gut microbiota after exposure to silver nanoparticles (AgNPs). Read More

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September 2021

Highly conductive electronics circuits from aerosol jet printed silver inks.

Sci Rep 2021 Sep 13;11(1):18141. Epub 2021 Sep 13.

Micro- and Nanotechnology Division, Institute of Metrology and Biomedical Engineering, Faculty of Mechatronics, Warsaw University of Technology, 8 sw. A. Boboli st., 02-525, Warsaw, Poland.

Recently, low-cost electronics printed on lightweight, flexible and 3D shaped substrates are gaining importance in the markets of wearables and smart packaging. However, printed electronics do not meet the electrical performance of subtractive techniques because the resistivity of metallic printed patterns is still much higher than that of bulk material. To fulfil this need, low-resistive and easy printable inks for high resolution printed electronics techniques are needed. Read More

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September 2021

A ratiometric electrochemical sensor for the determination of exosomal glycoproteins.

Talanta 2021 Dec 8;235:122790. Epub 2021 Aug 8.

School of Chemistry and Molecular Engineering, East China Normal University, 500 Dongchuan Road, Shanghai, 200241, PR China.

Abnormal glycosylation of exosomal proteins is related to many diseases. However, there is still a lack of convenient and easy methods for the determination of exosomal glycoproteins. In this work, a ratiometric electrochemical sensor based on the recognition of glycoproteins by boronic acid and core-shell nanoparticles of silica-silver ([email protected]) amplified signals was developed for the highly sensitive detection of exosomal glycoproteins. Read More

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December 2021

Aptamer/derivatization-based surface-enhanced Raman scattering membrane assembly for selective analysis of melamine and formaldehyde in migration of melamine kitchenware.

Talanta 2021 Dec 28;235:122743. Epub 2021 Jul 28.

School of Chemistry, Sun Yat-sen University, Guangzhou, 510275, China. Electronic address:

The analysis of contaminants in migration of food contact material (FCMs) is an urgent demand for food safety. In this study, melamine and formaldehyde in melamine kitchenware were selectively analyzed by surface-enhanced Raman scattering (SERS) via aptamer/derivatization-based membrane assembly. The membrane assembly was designed by simple filtration of Ag nanoparticles-decorated "stellate" silicon dioxide (SiO/Ag) and composites of reduced graphene oxide and Ag nanoparticles (rGO/Ag) functioned with specific reagents. Read More

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December 2021

Iodide-modified Ag nanoparticles coupled with DSN-Assisted cycling amplification for label-free and ultrasensitive SERS detection of MicroRNA-21.

Talanta 2021 Dec 22;235:122728. Epub 2021 Jul 22.

Department of Chemistry, Shanghai Stomatological Hospital, Institute of Biomedical Sciences, State Key Lab of Molecular Engineering of Polymers, Fudan University, Shanghai, 200433, China. Electronic address:

With the emergence of microRNA (miRNA) as a key player in early clinical disease diagnosis, development of rapidly sensitive and quantitative miRNA detection methods are imperative. Herein, a label-free SERS assay coupled with duplex-specific nuclease (DSN) signal amplification strategy was proposed for facilely ultrasensitive and quantitative analysis of miRNA-21. Firstly, magnetic beads assembled with excessive capture DNA were utilized to hybridize the target miRNA-21. Read More

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December 2021

Effects of silver nanoparticles-polysaccharide on bleomycin-induced pulmonary fibrosis in rats.

J Pharm Pharmacol 2021 Sep 13. Epub 2021 Sep 13.

Department of Microbial Biotechnology, National Research Centre, Dokki, Cairo, Egypt.

Objectives: The first goal of this study was to synthesize the silver nanoparticles Alcaligenes xylosoxidans exopolysaccharide (Ag-AXEPS). The second objective was to analyse the role of Ag-AXEPS nanoparticles (NPS) in treating bleomycin (BLM)-induced lung fibrosis.

Methods: Intratracheal bleomycin (2. Read More

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September 2021

Controlling the ligands of CdZnTe quantum dots to design a super simple ratiometric fluorescence nanosensor for silver ion detection.

Analyst 2021 Sep 13;146(18):5747-5755. Epub 2021 Sep 13.

School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, PR China.

A super simple ratiometric fluorescence nanosensor has been fabricated by controlling the ligands of CdZnTe quantum dots (QDs), allowing the sensitive and visual detection of silver ions (Ag). The green-emitting L-cysteine-protected CdZnTe QDs (Lcys-CdZnTe QDs) had a specific response to Ag and were used as the reporting probe, while the red-emitting -acetyl-L-cysteine-protected CdZnTe QDs (NAC-CdZnTe QDs) showed no obvious response to all tested metal ions and were selected as the reference probe. Simply mixing them without any encapsulated synthesis ultimately produced a time-saving, low-cost detection method, allowing the sensitive and visual detection of Ag in samples. Read More

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September 2021