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  • 1
    Electronic Resource
    Electronic Resource
    The polymerization of dimethyldiallylammonium chloride by gamma irradiation as followed by 1H NMR (1988)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Letters Edition 26 (1988), S. 333-339 
    Details
    ISSN: 0887-6258
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1988.140260801
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Electron transfer through an immunoglobulin layer via an immobilized redox mediator (1996)
    Weinheim : Wiley-Blackwell
    Electroanalysis 8 (1996), S. 143-146 
    Details
    ISSN: 1040-0397
    Keywords: Redox mediators ; Immunoglobulin G ; Polyvinyl ferrocene ; Butyl ferrocene ; lmmunosensor model ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: As a step towards a voltammetric immunoassay with antibodies directly attached onto the electrode surface, the mediated oxidation of a redox active label has been investigated with a model system. Butyl ferrocene served as a model for the mediator and was coimmobilized onto a glassy carbon electrode within a layer of bovine immunoglobulin G, which mimiked the antibody. An overlaid polyvinyl ferrocene layer was employed to simulate a ferrocene-tagged high molecular weight antigen bound to the immobilized antibodies. A mediated electron transfer could only be demonstrated with butyl ferrocene as mediator, whereas other compounds failed to support an electron transfer between the polyvinyl ferrocene layer and the electrode through the layer of immunoglobulin.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/elan.1140080209
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Electrochemical determination of oxygen permeability of isolated stratum corneum membranes (1993)
    Weinheim : Wiley-Blackwell
    Electroanalysis 5 (1993), S. 641-645 
    Details
    ISSN: 1040-0397
    Keywords: Oxygen ; Permeability ; Membrane ; Skin ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The mammalian stratum corneum is a thin, highly organized polymeric membrane which is relatively impermeable to water but permeable to some gases including oxygen. Isolated stratum corneum membranes from perinatal Sprague-Dawley rats were mounted under electrodes used to determine the rate of diffusion of oxygen through the membrane. These membranes were consistently found to be permeable to oxygen, which could be quantitatively determined at a gold electrode at -0.6 V (vs. a Ag/AgCl electrode). The stratum corneum membrane was found to be anisotropic, with greater oxygen permeability when the gas diffused toward the electrolyte from the side of the membrane which would be oriented toward the exterior of the animal than when it diffused in the opposite direction. There is also evidence of anatomic site heterogeneity in the permeability of the membranes.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/elan.1140050803
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    An Analytical Study of the Redox Behavior of 1,10-Phenanthroline-5,6-dione, its Transition-Metal Complexes, and its N-Monomethylated Derivative with regard to their Efficiency as Mediators of NAD(P)+ Regeneration (1997)
    Weinheim : Wiley-Blackwell
    Chemistry - A European Journal 3 (1997), S. 79-88 
    Details
    ISSN: 0947-6539
    Keywords: catalysis ; cobalt ; cofactors ; redox systems ; ruthenium ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The synthesis as well as the chemical and electrochemical properties of homoleptic and heteroleptic (trispyridyl-methylamine as coligand) transition-metal complexes (Ru and Co) of 1,10-phenanthroline-5,6-dione (PD) and of its N-monomethylated derivative (PDMe+) are described. In particular, their ability to abstract hydride ions was studied. Electrochemical investigations with cyclic voltammetry, rotating disk electrode experiments, and spectroelectrochemical methods at different pH values gave an insight into the complex electrochemistry of the compounds described, which is strongly influenced by a hydration pre-equilibrium. The electrochemically active quinone form of the transition-metal complexes can be reduced to the hydroquinone state in acidic solution and to their transition-metal-stabilized semi-quinone states for neutral and basic solutions, whereas PDMe+ is reduced to the hydroquinone state in both acidic and neutral solutions. The compounds can also be reduced chemically, and are efficient catalysts for the indirect oxidation of the enzymatic cofactor NAD(P)H. For the indirect aerobic NAD(P)H oxidation, up to 900 turnovers per hour can be observed, an achievement yet to be reached by other catalyst systems.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/chem.19970030114
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  • 5
    Electronic Resource
    Electronic Resource
    Blank response at glassy carbon electrodes in a flow injection system (1992)
    Weinheim : Wiley-Blackwell
    Electroanalysis 4 (1992), S. 33-40 
    Details
    ISSN: 1040-0397
    Keywords: Flow injection analysis ; amperometric detection ; glassy carbon electrode ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The blank response at glassy carbon electrodes in a flow injection system consists of a transient component and a steady state (residual current) component. The transient response is attributed to nonfaradaic current and faradaic current from the oxidation-reduction of electroactive surface functional groups on glassy carbon. The magnitude of the transient response was dependent on the potential applied to the electrode, temperature, ionic strength and pH of the injected sample solution, and independent of the flow rate. A linear relationship exists between the transient response and the difference in concentration of ionic species or pH between injected sample and the carrier. A differnce of 0.01 M ionic concentration or 0.04 pH unit between carrier and injected sample could change the transient charge by ca. 0.038 μC/cm2. The shape of the transient response due to pH difference at high positive potential indicates that some changes occur on glassy carbon surface in this potential region.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/elan.1140040108
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  • 6
    Electronic Resource
    Electronic Resource
    The analysis of fountain pen inks by capillary electrophoresis with ultraviolet/visible absorbance and laser-induced fluorescence detection (1998)
    Weinheim : Wiley-Blackwell
    Electrophoresis 19 (1998), S. 31-41 
    Details
    ISSN: 0173-0835
    Keywords: Questioned documents ; Inks ; Capillary zone electrophoresis ; UV/VIS and LIF detection ; Separation and comparison ; Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Information on the identity of inks adds to the circumstantial evidence in legal cases involving fraudulent documents. In combination with optical methods, multiple thin-layer chromatography (TLC) is currently the analytical tool used by forensic chemists to separate, compare and distinguish inks based on their dye composition. In our studies, capillary electrophoresis (CE) was used for the analysis of water-soluble fountain pen inks. Inks are complex mixtures of synthetic organic and inorganic dyes, surfactants, resins and other components. The investigations included the development of an electrophoretic separation method, the optimization of an extraction procedure for inks from paper as well as the evaluation of ultraviolet/visible (UV/VIS) absorbance and laser-induced fluorescence (LIF) detection for the analysis of inks by CE. Good results for the separation of 17 blue and black inks of different manufacturers and countries of origin were obtained with 100 mM borate buffer, pH 8.0, containing 20% methanol. The electropherograms of the inks and their extracts from paper showed patterns that were in most cases distinctly different from each other. Ultraviolet/visible scans can be used to compare spectra of the separated main and trace components of inks. Fluorescence detection at different excitation and emission wavelengths was more sensitive, but added to the complexity of the electropherograms due to the excitation of coextracted fluorescing paper components. The resolution power of CE combined with the information content provided by the detection modes investigated prove CE to be a powerful tool for the identification of water-soluble inks used on paper documents.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/elps.1150190108
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