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Showing 1 to 20 of 35 for “"polyethyleneimine"”.
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Core-based hyperbranched polyethyleneimine coating in capillary electrophoresis
… the selectivity. , core-based hyperbranched polyethyleneimine (CHPEI) polymer utilized as either a static or dynamic coating in this study. A CHPEI-coated capillary was simply constructed in a rinsing fashion or by adding a small amount of CHPEI in a running buffer. In CHPEI-coated …
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Porphyrin Cross-Linkers for Generating Soluble Molecularly Imprinted Polymers from Polyethyleneimine
… porphyrins which we have successfully coupled to polyethyleneimine (PEI), forming a condensation polyamide. We have demonstrated that one of these porphyrins can be used as an efficient polymer cross-linker, which provides a unique quadruplex DNA binding site in the polymer network. Unfortunately, …
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Improving Sample Collection Of Trace Particles Of Mock Explosive On Nano Coated Sensor
… substrate. The effects of varying the amount of polyethyleneimine in the nano coating solution of the sensor to adsorb trace particles of a mock explosive are studied. A nano coating mixture of ferrofluid, polyethyleneimine and epoxy are coated on the surface of PZT substrate, and exposed to a …
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Purification of an acidic recombinant protein from transgenic tobacco
… and purity. Polyelectrolyte precipitation with polyethyleneimine (PEI) was identified as an initial purification step for purifying acidic recombinant proteins from tobacco. Polyethyleneimine precipitation allowed for high recovery and concentration of the target protein while removing large …
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An Evaluation of Coating Material Dependent Toxicity of Silver Nanoparticles
… (citrate, polyvinyl pyrrolidone, and branched polyethyleneimine, coated AgNPs as citrate-AgNPs, PVP-AgNPs, and BPEI-AgNPs respectively). Two acute aquatic toxicity tests were performed; 48hr D. magna and MetPLATE E. coli toxicity tests. Significantly different toxicity effects were observed in …
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Removal of carbon dioxide and water using a solid amine adsorption bed for extended space flight
… adsorption of carbon dioxide and water onto a polyethyleneimine coated acrylic ester substrate (designated HSC+). Nineteen experimental adsorption breakthrough tests were conducted using a test bench at NASA/Johnson Space Center, Houston, Texas. CO$\sb2$ and H$\sb2$O adsorption equilibrium data …
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Chemistry directed assembly of multilayered polymer thin films and colloidal particles
… oligoethylene glycol (EG) surface groups, linear polyethyleneimine (LPEI) based multilayers predominately adsorb on the COOH surface, with maximal selectivity at the moderate pH level of 4.8; in contrast, polyallylamine hydrochloride (PAH) based multilayers are attracted to the EG surface under …
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Emulsion Polymerization Using Switchable Surfactants
… carried out. It was determined that butylated polyethyleneimine (BPEI) can successfully stabilize inverse emulsions of cyclohexane and aqueous 2-(dimethylamino)ethyl methacrylate. Upon CO2 introduction, this emulsion separates into two distinct phases.
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AN INVESTIGATION INTO THE ANALYTICAL UTILITY OF CHANGES IN POLARIZATION ACCOMPANYING ANALYTICAL DERIVATIZATION REACTIONS (FLUORESCENCE)
… reagent. In a set of kinetics experiments with polyethyleneimine, changes in polarization were observed but could not be distinguished from randomness brought about by the experimental conditions.</p><p>Dansyl chloride was more difficult to work with than either of the fluorescein compounds due …
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Solid oxide fuel cell electrolytes produced via very low pressure suspension plasma spray and electrophoretic deposition
… surface area, polyvinyl butyral (PVB) content, polyethyleneimine (PEI) content, and acetic acid content. Increasing PVB content and reduction of particle specific surface area were found to eliminate the formation of cracks when drying. PEI and acetic acid content were used to control suspension …
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Surface Characteristics of Silica Polyamine Composites
… to irreversibly bind to the chelating polymer polyethyleneimine (PEI). This was due to oxidation of Co2+ to Co3+, which was enabled by the chelate's ligand field stabilization. Detailed analysis of SPC surface coordination environments elucidated the types of coordination environments present. …
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Comparison of Silica Polyamine Composites and Crosslinked Polystyrene Resins
… (PAA). In the case of the branched polymer polyethyleneimine (PEI), no such change in selectivity was observed. While these results are not well understood at this time, this allows the Rosenberg group and Purity Systems Inc. another way of fine tuning the metal selectivities of silica …
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Surface Characteristics of Silica Polyamine Composites
… to irreversibly bind to the chelating polymer polyethyleneimine (PEI). This was due to oxidation of Co2+ to Co3+, which was enabled by the chelate's ligand field stabilization. Detailed analysis of SPC surface coordination environments elucidated the types of coordination environments present. …
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Comparison of Silica Polyamine Composites and Crosslinked Polystyrene Resins
… (PAA). In the case of the branched polymer polyethyleneimine (PEI), no such change in selectivity was observed. While these results are not well understood at this time, this allows the Rosenberg group and Purity Systems Inc. another way of fine tuning the metal selectivities of silica …
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Multifunctional Graphene-Based Nanomaterials for Removal of Diverse Water Contaminants
… a polymeric matrix containing chitosan (CS) and polyethyleneimine (PEI) to form nanocomposites as membrane coatings and beads. The optimized CS-PEI-GO nanocomposite effectively removed heavy metals, nitrate, and microorganisms, indicating their multifunctionality. The nanocomposite was tested …
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Novel Lipid Polymer Design for Nucleic Acids Delivery
… to solid tumors remains a significant barrier. Polyethyleneimine (PEI), in particular, was once considered the gold standard in polymer-based nucleic acid delivery due to its high transfection efficiency, but its clinical application has been limited by toxicity. In this study, we investigate a …
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Treponema hyodysenteriae: growth and production of hemolysin
… Although, hydroxylapatite adsorption and polyethyleneimine precipitation completely adsorbed or precipitated hemolytic activity I I was unable to efficiently recover the activity. Partially purified hemolysin was c}10toxic to CHO cells, and caused lysis rather than the rounding effect …
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Electrochemical Deposition of Copper and Zinc Nanomaterials at Polypyrrole Thin Films
… was improved with the introduction of polyethyleneimine-functionalized multiwall carbon nanotubes (MWNT-PEI) to the PPy-PSS films. Electrochemical impedance spectroscopy studies showed that the nanotubes increased the electronic conductivity of the reduced films. The limit of detection …
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Synthesis and application of biomaterials containing the 1,3,5-triazaadamantane moiety or functionalized alginate
… were also reacted with low molecular weight polyethyleneimine (PEI) to synthesize degradable gene delivery vehicles. Degradable PEIs had varying gene delivery efficiencies and cell toxicities based on the cross-linker used. A polymer was made that produced comparable gene delivery efficiency …
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Development and evaluation of glucose-responsive biomaterials as self-regulated insulin delivery systems
… insulin to positively charged polymers, such as polyethyleneimine When the pH is reduced below the isoelectric point of insulin, the complex dissociates and releases insulin only in response to elevated levels of glucose. These complexes are afforded a prolonged functional lifetime by decreasing …
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