The effect of poly(N-vinylpyrrolidone) (PVP) concentration on the synthesis and properties of silver nanoparticles (AgNPs) was investigated. Nanoparticles have been prepared by a chemical reduction method from the aqueous solution of silver nitrate and PVP as a stabilizing agent in the presence of sodium borohydride as a reducing agent. The nanosized silver colloids have been characterized usin...

The present study demonstrates non viral gene delivery using chitosan nanoparticles in Macrobrachium rosenbergii as model organism. Chitosan nanoparticles were synthesized by ionic gelation method. The mean particle size of chitosan nanoparticles was 27.6nm. The Polydispersity index was found to be 0.448 and zeta potential was +24.79mV. Green fluorescent protein encoding plasmid (PDB-402) was u...

Boronic acids have been widely investigated for their potential use as glucose sensors in glucose responsive polymeric insulin delivery systems. Interactions between cyclic diols and boronic acids, anchored to polymeric delivery systems, may result in swelling of the delivery system, releasing the drug. In this study, 4-formylphenylboronic acid conjugated chitosan was formulated into insulin co...

Dry aqueous foams made of anionic surfactant (SDS) and spherical gold nanoparticles are studied by small angle X-ray scattering and by optical techniques. To obtain stable foams, the surfactant concentration is well above the critical micelle concentration. The specular reflectivity signal obtained on a very thin film (thickness 20 nm) shows that functionalized nanoparticles (17 nm typical size...

In this paper, we report a method for fabricating biofunctionalized nanoparticles by attaching human immunoglobulin (IgG) onto their surfaces through either electrostatic interactions or covalent binding. We found that these IgG-presenting nanoparticles can bind selectively to the cell walls of pathogens that contain IgG-binding sites based on the investigation of transmission electron microsco...

Nanocomposite microcapsules with both gold and magnetite nanoparticles in the shell were prepared in a layer-by-layer procedure using biocompatible polyelectrolytes and nanoparticles. The process of a nanocomposite multilayer formation was investigated using a quartz crystal microbalance (QCM). In addition, nanocomposite microcapsules were characterized by atomic force microscopy (AFM), transmi...

in this study, synthesis of copper nanoparticles and effect of the reaction conditions on the particle size were investigated. the copper nanoparticles were synthesized and stabilized in a narrow temperature range in the presence of polyvinylpyrrolidone under nitrogen atmosphere. reaction temperature and concentration ratio of the reducing agent to the precursor (r/p) as two main conditions i...

Silver nanoparticles were synthesized in reverse micelles consisting of sucrose fatty acid esters by dissolving reactant powder in the water pool of reverse micelles through the solid-liquid extraction. Silver nanoparticles having various sizes and shapes were obtained at high concentration. The size of silver nanoparticles was controlled by reaction temperature. Moreover, the size of silver na...

introduction: nanoparticles are being increasingly applied in dentistry due to their antimicrobial and mechanical properties. this in vitro study aimed to assess and compare the cytotoxicity of four metal oxide nanoparticles (tio 2 , sio 2 , zno, and al 2 o 3 ) on human dental pulp stem cells. methods and materials: four suspension with different concentrations (25, 50, 75, 100 µg/ml) of each n...

nanotechnology is a new and specific method for therapy of diseases. nanosilver particle is one of the functional fields of nanotechnology. it has been shown that these nanoparticles have antibacterial and antifungal properties. different studied have been shown that nanoparticles may have important role in medicine. for example, it has been shown to have inhibitory effects on the treatment of ...