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Showing 1 to 20 of 72 for “"Amino groups"”.
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The Specific Carboxymethylation of the N-Terminal Amino Groups of Human Hemoglobin: Structural and Functional Implications
… selective reductive carboxymethylation of the α-amino termini of hemoglobin (Hb)<sup>1</sup> and the structural and functional consequences of such a modification. The initial premise for such a modification (HbNHCH<sub>2</sub>COO<sup>-</sup>) was to test its usefulness as a carbon dioxide …
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Preparation, characterisation and functional applications of whey protein-carbohydrate conjugates as food ingredients
… of aggregation state on availability of amino groups in whey proteins was investigated; sulfhydryl-disulphide interchange and disulphide-bond mediated aggregation of whey proteins resulted in decreased availability of amino groups as measured by the o-phthalaldehyde (OPA) and …
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Synthesis and Surface Characterization of Silica-Polypeptide Composite Particles
… (P/F) by a mixture of (3-aminopropyl) trimethoxysilane (APS) and methyl-trimethoxysilane (MTMS). The amino groups were quantified using UV-Vis spectrometry after reaction with ninhydrin. The use of zeta potential measurements of the P/F silica particles at low pH is …
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Entwicklung von Polymermembranen für die Abtrennung von Kohlendioxid aus Gasströmen
… polymeric membranes is based upon the fact that amino groups in aqueous matrices facilitate the transportation of carbon dioxide. Therefore polymethacrylates and polyacrylates with different amino groups in side chains, polymers based on 4-vinylpyrridin and co-polymers of each with acrylonitrile …
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Verfahren zur Funktionalisierung und bioaktiven Ausrüstung von Implantatoberflächen für eine verbesserte Gewebeintegration
Generation of aliphatic amino groups by means of CVD-coating Within the course of this work a novel CVD-coating, which allows the generation of aliphatic amino functional groups on the surface of various materials, was developed. In particular a high availability of functional groups as anchor …
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The design, synthesis and characterization of polynuclear materials for applications for catalysis
… characterization of new chitosan- and 6-deoxy-6-amino chitosan-supported ligands is discussed. This was achieved via the reaction of either 2-pyridinecarboxaldehyde or 2-(diphenylphosphino)benzaldehyde with the accessible amino groups of chitosan to afford chitosan-supported Schiff base ligands …
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Funktionalisierung von Polydimethylsiloxan-Oberflächen zur Steuerung molekularer Zell-Substrat Wechselwirkungen
… adhesion. Hydrogels were covalently bound to amino groups, produced in the PDMS surface. Peptide sequences or aptamers were reacted with the hydrogel layer to allow specific cell adhesion via ligand-receptor interactions. First PDMS surfaces were functionalised with amino groups. Exposition in …
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Single label fluorescent derivatization of peptides
… pH that discriminates against $\varepsilon$-amino derivatization in favor of $\alpha$-amino derivatization provided that this group may act as an efficient nucleophile. A kinetic study was performed in order to identify the optimal derivatization buffer pH for $\alpha$-amino group …
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Active Center Studies on Bacterial Luciferase: Modification of the Enzyme With 2,4-Dinitrofluorobenzene
… is the result of reaction with one or more amino groups. The dinitrophenyl moiety is incorporated into the (alpha) subunit approximately twice as fast as it is incorporated into the (beta) subunit; the rate of inactivation is nearly identical to the rate of incorporation into the …
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Molecules and materials for the optical detection of explosives and toxic chemicals
… class of conjugated polymers that contain alkyl-amino groups directly bound to the arene rings of poly(phenylene ethynylene)s and poly(fluorene)s. These materials displayed red-shifted absorption and emission spectra, large Stokes Shifts, as well as long excited state lifetimes.
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The impact of moisture-induced aggregation of soy protein isolate and hydrolysate during storage on product and nutritional quality
… protein/peptide profile, loss of free amino groups, formation of fluorescent Maillard compounds, and denaturation were monitored using well-established methods of analysis. Reaction kinetics were used when possible to better understand the effects of storage parameters and sample types, …
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Development of a System of MEA Solutions Activated by Novel Poyamines for Natural Gas Sweetening Mass Transfer in Absorber and Desorber Columns
… (PEI-B) (MW ≈ 800 with almost 16 amino groups) showed a superior performance in adsorption applications for capturing CO2, it was important to test its performance in absorption process. Tetraethylenepentamine (TEPA) is another polyamine (five amino groups) that was indicated in …
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'Quat-Primer' polymers based on b-PEI and their application in composites
… or both and (ii) to supply cyclic carbonate groups that can copolymerize with the amine components of epoxy resins during the curing step. Branched Polyethylenimine has primary, secondary and tertiary amino groups in the molar ratio of 31:39:30 respectively. The primary and secondary amines …
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THE DEVELOPMENT OF PYRROLOPYRIMIDINE LIBRARIES
… established that compounds containing thiomethyl groups at the C1 position could not be used for the substitution with amino groups. Efforts to prepare the chloro-substituted scaffold are described. In Chapter Three, previously established methodology using ionic hydrogenation was applied to …
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Extrusion performance and physicochemical characterization of texturized native and chemically modified whey proteins in carbohydrate-containing systems
… By modifying the reactivity of either the free amino or carboxyl groups of the protein, texturization and/or puffing of corn starch-based WPI-containing products can be controlled. An optimum between the presence of disulfide bonds and hydrophobic interactions to form a properly texturized …
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The application of novel multinuclear catalysts derived from dendrimeric ligands in the polymerization and oligomerization of unsaturated hydrocarbons
… appropriate salicylaldehyde and the peripheral amino groups of the corresponding G1 and G2 polypropyleneimine dendrimers. The new ligands were characterized using FTIR, 1H NMR and 13C NMR spectroscopy, elemental analysis and ESI mass spectrometry. The dendrimeric ligands were converted to …
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Electrostatics and packing in biomolecules : accounting for conformational change in protein folding and binding
… The effect of chemically modifying lysine e-amino groups was computed, and the average calculated value showed good agreement with experimental results determined by capillary electrophoresis. In a second study, the continuum model was used to analyze all the electrostatic interactions in the …
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Enzymatic treatment of polyamide 6.6 fibres
… fibres surfaces leads to the formation of amino and carboxylic end groups. The presence of these groups improves hydrophilicity and creates further starting points for covalent bonding of certain compounds. The coupling of flame retardants, proteins and other compounds bring extra added …
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The Nonenzymatic Modification of Proteins by Steroids and DNA by Reducing Sugars; In Vitro and In Vivo Studies
… to a hydroxyl group, can react with protein amino groups to form stable Heyns rearrangement products. The second is the observation that reducing sugars can react with the nucleotides of DNA to form covalent adducts. The steroids which react with proteins include the glucocorticoids; such as …
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