Bibliothek

X
feed icon rss

Ihre E-Mail wurde erfolgreich gesendet. Bitte prüfen Sie Ihren Maileingang.

Leider ist ein Fehler beim E-Mail-Versand aufgetreten. Bitte versuchen Sie es erneut.

Vorgang fortführen?

Exportieren
  • 1
    Digitale Medien
    Digitale Medien
    A study of uricase biosensor based on a glassy carbon electrode modified with Nafion and methyl viologen (1993)
    Springer
    Microchimica acta 112 (1993), S. 71-75 
    Details
    ISSN: 1436-5073
    Schlagwort(e): uricase ; biosensor ; Nafion-MV modified electrode
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Abstract A uricase biosensor was constructed by using bovine serum albumin and glutaraldehyde as cross linker to immobilize uricase on a glassy carbon electrode modified with Nafion and methyl viologen (MV). A linear response of uric acid in serum was observed in a range of 1.0·10−3 to 5.0·10−6 mol/1 and the response time is 25 s. This biosensor has the advantage of high sensitivity, fast response as compared with previous sensors and low interferences.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01243323
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 2
    Digitale Medien
    Digitale Medien
    Cathodic stripping voltammetric determination of anti-cancer medicine nitrocaphanum at nafion modified electrode (1991)
    Springer
    Microchimica acta 103 (1991), S. 115-120 
    Details
    ISSN: 1436-5073
    Schlagwort(e): Nafion modified electrode ; anti-cancer medicine nitrocaphanum ; cathodic stripping voltammetry
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Abstract An electrochemical method for the determination of anti-cancer medicine nitrocaphanum was described. The reaction mechanism of nitrocaphanum at Nafion CME was also discussed. It was found, in pH 2.5 medium, a linear response was observed for nitrocaphanum in the concentration range of 2.2 × 10−8 M to 1.3 × 10−6 M. Detection limit of this method is 5 × 10−9 M, relative standard deviation for 10 measurements is 1.7%. The results of nitrocaphanum determination in real samples were satisfactory.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01309017
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 3
    Digitale Medien
    Digitale Medien
    Polydiphenylamine-dodecyl sulfate films for the simultaneous amperometric determination of electroinactive anions and cations in ion-exclusion cation-exchange chromatography (2000)
    Springer
    Fresenius' journal of analytical chemistry 368 (2000), S. 791-796 
    Details
    ISSN: 1432-1130
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Abstract An amperometric detector with two working electrodes both modified with polydiphenylamine-dodecyl sulfate (PDPA-DS) was successfully used for the simultaneous determination of electroinactive anions (SO4 2–, Cl–, NO3 –) and cations (Na+, NH4 + and K+) in single-column ion-exclusion cation-exchange chromatography (IEC-CEC). The PDPA-DS chemical modified electrode (CME) was based on the incorporation of dodecyl sulfate (DS) into PDPA by electropolymerization of diphenylamine in the presence of sodium dodecyl sulfate. The electrochemical responses against the anions and cations at the PDPA-DS CME in differential pulse voltammetry were studied. A set of well-defined peaks of electroinactive anions and cations were obtained. The anions and cations were detected conveniently and reproducibly in a linear concentration range 0.01–5.0 mmol/L and their detection limits were in the range 5–9 μmol/L at a signal-to-noise ratio of 3 (S/N = 3). The proposed method was quick, sensitive and simple and was successfully applied to the analysis of lake water samples. The working electrode was stable over one week period of operation with no evidence of chemical and mechanical deterioration.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s002160000591
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 4
    Digitale Medien
    Digitale Medien
    Electrocatalytic reduction of nitrite on the surface of a glassy carbon electrode modified by palladium(II)-substituted Dawson type heptadecatungstodiphosphate (1999)
    Springer
    Fresenius' journal of analytical chemistry 363 (1999), S. 236-240 
    Details
    ISSN: 1432-1130
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Abstract A palladium(II)-substituted Dawson type heptadecatungstodiphosphate, K8[P2W17O61Pd(H2O)](abbreviated as P2W17Pd in the following), was used to construct a new kind of chemically modified electrode (CME) by electrodeposition on the surface of a glassy carbon electrode for the first time. This modified electrode was characterized by Fourier transform infrared reflection absorption spectroscopy (FTIRRAS), X-ray photoelectron spectroscopy (XPS) and cyclic voltammetry (CV). FTIRRAS and XPS suggested that the adsorbed species on the electrode surface has the same Dawson type structure as the heteropolyanion in buffer solution. A couple of waves was observed on the P2W17Pd CME, which was ascribed to the redox process of the palladium center in the heteropolytungstate. After continuous potential scanning for 30 min in a pH 4.0 buffer, 94% of the original coverage remains for the CME. The P2W17Pd CME had high electrocatalytic activity for nitrite reduction and exhibited good reproducibility and stability. The catalytic peak current was found to be linear with the nitrite concentration in the range of 1 ∼ 50 mmol/L, with a correlation coefficient of 0.994. The effect of solution pH on the catalytic activity of the CME for nitrite reduction was also investigated.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s002160051180
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 5
    Digitale Medien
    Digitale Medien
    An Ni(chitin)2 modified nitric oxide microsensor (1999)
    Springer
    Fresenius' journal of analytical chemistry 365 (1999), S. 587-591 
    Details
    ISSN: 1432-1130
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Abstract The development of a simple, sensitive, selective, and stable amperometric nitric oxide microsensor is described. It is based on Ni(chitin)2 mediators immobilized on a platinum, Nafion modified electrode. The detection of NO is based on the Ni(chitin)2 catalysis of NO oxidation at an anodic potential of +0.74 V (vs. SCE). The catalytic peak current is linear for a NO concentration in the range of 8.5 × 10–8 mol/L to 1.5 × 10–5 mol/L, with a correlation coefficient of 0.9992. The detection limit of the microsensor is 5.0 × 10–8 mol/L. It is suitable for the direct measurement of NO in biological systems.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s002160051527
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 6
    Digitale Medien
    Digitale Medien
    Four potential step differential amperometry in a single pulse sequence mode (1994)
    Weinheim : Wiley-Blackwell
    Electroanalysis 6 (1994), S. 481-484 
    Details
    ISSN: 1040-0397
    Schlagwort(e): Pulse amperometry ; Detection ; Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: A new type of four potential step differential amperometry in a single pulse sequence mode is proposed on the basis of four potential step differential normal voltammetry. The charging current tends to be eliminated, and the background current is set at zero after the differentiation and addition of the sampling currents on these four potential steps. The signal-to-noise ratio is enhanced by utilizing a series of pulses. In addition, since the potential returns to its initial point, it is advantageous for electrode cleaning and the study of solid electrode and adsorption systems. This provides an alternative approach for electrical current-type electrochemical sensors, electrochemical detection in liquid chromatography, and electrode kinetics studies.
    Zusätzliches Material: 3 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/elan.1140060520
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
Schließen ⊗
Diese Webseite nutzt Cookies und das Analyse-Tool Matomo. Weitere Informationen finden Sie hier...