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  • 1
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Analytical chemistry 61 (1989), S. 2462-2464 
    ISSN: 1520-6882
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Analytical chemistry 62 (1990), S. 2742-2744 
    ISSN: 1520-6882
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 61 (1957), S. 1341-1343 
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Medical & biological engineering & computing 5 (1967), S. 591-596 
    ISSN: 1741-0444
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Description / Table of Contents: Sommaire Cet article décrit la conception d’une éléctronique particulièrement adaptée aux mesures électromètriques et aux compensations thermiques des électrodes de verre. On a remplacé le traditionnel électromètre à chopper par un transistor à effet de champ du type MOSFET (semi-conducteur à oxyde métallique) excité par des signaux carrés; l’étalon de tension est remplacé par une source de référence, asservie par un transistor MOSFET de puissance et entièrement transistorisée; les alimentations continues sont d’un type nouveau, stabilisées par des transistors complémentaires; les modules amplificateurs différentiels du type NPN sont combinés de façon à réaliser de nombreuses performances. Cette conception apporte des progrès très nets dans la stabilité, la sensibilité, l’encombrement et le prix de tels ensembles. Des commentaires critiques seront les bienvenus.
    Abstract: Zusammenfassung In dieser Mitteilung wird der elektronische Schaltplan für verbesserte Elektrometrie—und Temperaturkontrolle bei ionenempfindlichen Elektroden beschrieben. Die konventionelle Hackstromelektrometer-Vorverstärkereinheit wird durch einen Metalloxyd-Halbleiter-Feldeffekt-Transistor (MOSFET) mit Rechteckstrom ersetzt; eine Festörperspannungsquelle mit MOSFET-Kontrolle tritt an die Stelle der üblichen “bucking”-Spannung; neue zusätzliche stabilisierte D.C.-Stromversorgung; NPN-proportionale Verstärker-Differentialeinheiten. Die aufgezählten Neuerungen ermöglichen zusammen viele interessante Weiterentwicklungen. Die Anordnung stellt eine beträchtliche Verbesserung hinsichtlich Stabilität, Empfindlichkeit, Größe und Kosten dar. Kritische Kommentare werden gern entgegengenommen.
    Notes: Abstract This communication describes the electronic design for improved electrometry and temperature control of ion-sensitive electrodes. Some features are: the use of a square wave pulsed metal-oxide semiconductor field-effect transistor (MOSFET) to replace the conventional chopped electrometer preamplifier unit; a solid-state-powered, MOSFET-controlled, reference voltage source substituting for the conventional ‘bucking’ voltage; new d.c. complementary stabilized power supplies, and differential amplifying units, combine to make possible many intriguing advances. The design affords a marked improvement in stability, sensitivity, size and cost. Critical commentaries will be welcomed.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Electroanalysis 2 (1990), S. 107-111 
    ISSN: 1040-0397
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A film that contains ruthenium oxide of mixed valences and cyanide (mvRuCN) on a glassy carbon electrode promotes the diffusion-controlled oxidation of cysteine and glutathione at 0.92 V vs. Ag/AgCl. These mediated oxidations allow the determination of these thiols by flow-injection amperometry in pH 2 solutions of 0.2 or 0.02 M K2SO4. Calibration curves are linear over about three orders of magnitude, and detection limits are in the submicromolar range with 7.5 μL injections. The sensitivity for cysteine is about 50 nA/μM with a flow rate of 1.0 mL/min. The throughput calculated on the basis of peak widths was 140 samples/h. Experimentally, with a manual injector, 60 samples/h were routinely analyzed. The sensitivity for glutathione in 0.2 M K2SO4 at pH 2 is somewhat lower, 36 nA/μM. A single electrode was used for hundreds of injections over a 2-week period with no change in sensitivity. The mvRuCN-coated electrode is operated in a potentiostatic mode; reactivation of the surface between series of experiments was not necessary. The electrode was stored at open circuit in contact with an electrolyte solution when not in use.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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