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  • Polymer and Materials Science  (16)
  • 1
    Electronic Resource
    Electronic Resource
    Synthesis and binding properties of a noncovalent molecularly imprinted testosterone-specific polymer (1998)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 36 (1998), S. 1725-1732 
    Details
    ISSN: 0887-624X
    Keywords: crosslinked polymer ; template polymerization ; noncovalent molecular imprinting ; testosterone ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: In this study, molecular imprinting was used to develop a method based on noncovalent interactions for synthesis of a testosterone-specific polymer. The effect of the different template-monomer ratios, the particle sizes of polymers, and chromatographic mobile phases on steroid-polymer interactions are discussed. The polymer obtained was found to interact specifically with testosterone, while other steroids under study were eluted close to the void volume in the HPLC experiments. Batch rebinding studies in acetonitrile were undertaken to quantitatively evaluate the affinity of the polymer for testosterone. During this experiment, the testosterone concentration was measured in two ways: spectrophotometrically and by HPLC on a column with testosterone-specific imprinted polymer synthesized by us. Both methods resulted in similar values of association constants and the number of binding sites. However, the second method has obvious advantages when the analyzed solution contains a mixture of optically dense compounds. The results obtained focus on the two-point binding nature of the imprinted polymer-testosterone interaction and the significant role of hydrogen bonds between the OH group of testosterone and carboxy group of methacrylic acid residues inside specific recognition sites of the imprinted polymer. © 1998 John Wiley & Sons, Inc. J Polym Sci A: Polym Chem 36: 1725-1732, 1998
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Preparation and performance of poly(vinyl butyral) membrane for ultrafiltration (1993)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 48 (1993), S. 67-73 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Ultrafiltration membrane was prepared from poly(vinyl butyral). The effects of membrane thickness, polymer concentration, evaporation time, and evaporation temperature, etc., on the performance of the resulting membranes have been studied. Dimethylacetamide was used as a casting solvent. The membrane formed by casting the polymer from a 15 wt % solution and evaporation at 25°C for 30 s had a flux value of 250 cm3 / cm2 h (4.8 kg/cm2, 26°C) at 92.9% rejection level for dextran sodium sulfate (average mol. wt. 550,000) separation. © 1993 John Wiley & Sons, Inc.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1993.070480107
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  • 3
    Electronic Resource
    Electronic Resource
    Amperometric determination of free fatty acids by utilizing five sequential enzyme reactions (1989)
    Weinheim : Wiley-Blackwell
    Electroanalysis 1 (1989), S. 69-74 
    Details
    ISSN: 1040-0397
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: An enyme electrode for determination of free fatty acids was constructed. Five sequential enzyme reactions are involved in this biosensor. Acyl-CoA synthetase (EC 6.2.1.3) was used as a specific enzyme for free fatty acids, and produced AMP. AMP was then hydrolyzed with four other sequential enzyme reactions involving oxygen consumption. The oxygen consumed was measured by an oxygen electrode. Using this sensor, a good linearity was obtained between current decrease and free fatty acid concentration below 15 mM. The minimum concentration for the determination was 1.77 mM. The assay procedure was completed within 5 min.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/elan.1140010111
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  • 4
    Electronic Resource
    Electronic Resource
    Micromachined electrochemical flow cell for biosensing (1994)
    Weinheim : Wiley-Blackwell
    Electroanalysis 6 (1994), S. 735-739 
    Details
    ISSN: 1040-0397
    Keywords: Micromachining ; Biosensor ; Flow cell ; Miniaturization ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A miniaturized electrochemical flow cell was fabricated on a silicon substrate using micromachining techniques, including photolithography, vacuum deposition, anisotropic etching, and fusion bonding. The flow cell consisted of a glass plate with gold elearodes, a silicon chip with a V-shaped groove, and immobilized glucose oxidase. Hydrogen peroxide and glucose were measured by direct-batch injection and by using the device in flow-injection analysis (FIA) system.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/elan.1140060904
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  • 5
    Electronic Resource
    Electronic Resource
    Reactor type sensor for cyanide using an immobilized microorganism (1996)
    Weinheim : Wiley-Blackwell
    Electroanalysis 8 (1996), S. 1117-1120 
    Details
    ISSN: 1040-0397
    Keywords: Reactor type biosensor ; Cyanide ; Microbial sensor ; Immobilized bacteria ; On-line monitoring ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A reactor type biosensor using an immobilized bacteria (Pseudomonas fluorescens NCIMB 11764) columm and an oxygen electrode was developed for cyanide. The optimum conditions for the sensor in a flow system (pH 9, 25°C, flow rate 2.5 mg/min) resulted in a response time of less than 5min. A linear relationship was observed between the current decrease and the cyanide concentration over the range of 0.05-1 mg/L. Operating at 25 °C, the sensor was stable up to 30 days. Alginate gel as the immobilized matrix was more suitable than other matrices (agars, polyurethane, porous glass beads, zeolite, chitopearl). Satisfactory results were obtained when the sensor was applied to determine the concentration of cyanide in the river water.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/elan.1140081208
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  • 6
    Electronic Resource
    Electronic Resource
    An enzyme-containing ink for screen-printed glucose sensors (1995)
    Weinheim : Wiley-Blackwell
    Electroanalysis 7 (1995), S. 1027-1031 
    Details
    ISSN: 1040-0397
    Keywords: Sensor ; Ferrocenecarboxylic acid ; Glucose oxidase ; Screen printing ; Squeegee ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A glucose sensor employing ferrocene-bound glucose oxidase was fabricated by the screen printing technique. In order to obtain high GOD activity, glucose oxidase (GOD) was modified with ferrocenecarboxylic acid (fc) as an electron mediator. Simultaneous spectroscopic and electrochemical analyses showed that ferrocene-bound GOD (fc-GOD) displayed an increase in catalytic current. The ferrocene acts as an electron transfer relay between the active center of the enzyme and the gold electrode. The screen printing process was used to print successfully the unique fc-GOD containing ink onto the gold electrode patterned on the glass plate. The fc-GOD containing ink was specially developed to be suitable for the printing apparatus. The printed glucose sensor was shown to offer a stable calibration profile and stable electrochemical properties.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/elan.1140071106
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  • 7
    Electronic Resource
    Electronic Resource
    Flow-type cyanide sensor using an immobilized microorganism (1996)
    Weinheim : Wiley-Blackwell
    Electroanalysis 8 (1996), S. 876-879 
    Details
    ISSN: 1040-0397
    Keywords: Cyanide ; Saccharomyces cerevisiae ; Respiration inhibition ; Flow system ; Reactor-type microbial sensor ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A flow system for cyanide detection using Saccharomyces cerevisiae is described. This sensor system consists of two oxygen electrodes and immobilized S. cerevisiae whose respiration activity is measured by the oxygen electrodes. Since cyanide inhibits S. cerevisiae's respiration, it can be detected by measuring this inhibition. Two types of systems were constructed, characterized and compared. One is a membrane-type flow system in which S. cerevisiae was immobilized onto a cellulose membrane. The other is a reactor-type flow system in which S. cerevisiae was immobilized onto the glass beads. The sensor response was examined in the range from 0 to 15μM. The reactor-type sensor system displayed lower detection limit (0.15 μM) and better stability (16 days).
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/elan.1140081005
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  • 8
    Electronic Resource
    Electronic Resource
    Disposable amperometric CO2 sensor employing bacteria and a miniature oxygen electrode (1991)
    Weinheim : Wiley-Blackwell
    Electroanalysis 3 (1991), S. 53-57 
    Details
    ISSN: 1040-0397
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: We have developed a disposable bacterial CO2 sensor employing a miniature Clark-type oxygen electrode and autotrophic bacteria. To make the sensitive area less vulnerable to stress, to facilitate CO2 diffusion through the sensitive area, and to make the application to biosensors easier, the sensor structure was simplified by immobilizing the bacteria in an oxygen electrode cell along with a 0.1 M KCl electrolyte solution. We developed a novel process that allows immobilization of bacteria in a small sensitive area, thereby improving the response time. The response time of this CO2 sensor ranged from 1 to 3 minutes. A linear relationship was obtained for NaHCO3 concentrations between 0.5 and 3.5 mM (at 32°C and pH 5.5). The CO2 sensor can be used up to 10 times before disposal.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/elan.1140030110
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  • 9
    Electronic Resource
    Electronic Resource
    Amperometric glucose sensor using silicon oxide deposited gold electrodes (1991)
    Weinheim : Wiley-Blackwell
    Electroanalysis 3 (1991), S. 469-475 
    Details
    ISSN: 1040-0397
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Glucose oxidase (GOD) immobilized electrodes using silicon oxide, were fabricated and their characteristics were evaluated. Silicon oxide deposited gold band (200 μm wide) and disk (1 mm diameter) electrodes were fabricated by vapor deposition of silicon monoxide. Alkylaminosilan and glutaraldehyde treatments were performed on the silicon oxide surface, followed by GOD immobilization. The GOD-immobilized band electrode treated with 3-aminopropyltriethoxysilane was characterized in a flow injection system. Hydrogen peroxide produced by the enzyme reaction was measured, resulting in a good response capable of high glucose concentration determination. The calibration curve was linear in the range between 1 to 200 mM. The GOD-immobilized disk electrode treated with 3-aminopropyldimethylethoxysilane was examined using electron transfer mediators. The effect of the thickness of silicon oxide on the response to glucose was investigated, leading to the highest, response at the electrode with the silicon oxide film that was 400 nm thick. In addition, a numerical analysis was performed, suggesting that immobilized GOD was located mainly in the vicinity of the silicon oxide surface.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/elan.1140030605
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  • 10
    Electronic Resource
    Electronic Resource
    Direct electron transfer reaction of a blue protein from Alcaligenes faecalis strain 6 (1992)
    Weinheim : Wiley-Blackwell
    Electroanalysis 4 (1992), S. 765-770 
    Details
    ISSN: 1040-0397
    Keywords: Blue protein ; electron transfer ; biosensor ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The direct election tranfer reaction of a copper-containing blue protein from Alcaligenes faecalis strain 6 (AfBP) was investigated. AfBP showed quasi-reversible electron transfer kinetics at an edge-plane - oriented pyrolytic graphite electrode (PGE) without any electrode modifier. Investigation of the effect of solution conditions on the reaction suggested that a weak electrostatic interaction between the electrode and the protein facilitates the electron transfer.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/elan.1140040805
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